JPH10146037A - Linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the eddy current loss in iron loss and improve the motor efficiency by connecting and uniting an outer yoke and a center yoke, and arranging a movable coil in the space between a pair of side yokes consisting of laminated steel plates, a permanent magnet, and the center yoke, and connecting and uniting the movable coil and a shaft and driving them. SOLUTION: A tubular outer yoke 1 consisting of a winding iron core and a tubular center yoke 4 consisting of winding iron core provided inside a given space apart from this are connected and united. Then, a movable coil 6b is arranged in the space among a pair of side yokes 5 consisting of laminated steel plates and a permanent magnet 2 fixed inside the outer yoke 1 and the center yoke 4. The mobile coil 6 and a shaft 8 are connected and united, and they are driven in axial direction within the center yoke 4. Hereby, the motor efficiency can be improved by reducing the eddy current loss in iron loss because a magnetic path is made of laminated steel plates consisting of thin plates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving coil type linear motor, and is intended to improve motor efficiency and assemblability.

[0002]

2. Description of the Related Art FIG. 27 shows a schematic view of a linear motor disclosed in Japanese Patent Application Laid-Open No. 4-101657 as an example of a conventional linear motor.

[0003] A pair of cylindrical members 200, 201 having different outer diameters.
Are coaxially arranged and one end thereof is connected to be conductive, disposed between a pair of end plates 202, 202, and in a required space in which a cylindrical permanent magnet 203 is mounted on the inner peripheral surface of the outer cylindrical member 200 of the yoke member. A magnetic circuit for generating a static magnetic field and a movable coil 204 disposed in the air gap are disposed in the frame, and an output shaft 205 supported by end plates 202 and 202 so as to be able to move directly, and a movable coil 204 is configured to be connected and integrated by a bobbin 206.

[0004]

However, in the above-described conventional configuration, since the yoke member is formed of a block material such as iron, iron loss such as eddy current loss and hysteresis loss is large, and motor efficiency is reduced. However, there is a problem that it is contrary to energy saving.

In addition, there is a problem that the movable coil is closed in the yoke, and it is difficult to perform initial positioning of the movable coil when assembling the linear motor.

In addition, when used in a motor such as a compressor, a user must attach a piston or the like to a shaft as needed, and there is a problem that the overall shape becomes large.

Further, since a strong permanent magnet is used, there is a problem of the influence of magnetic leakage depending on the application.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a linear motor in which eddy current loss in iron loss is reduced and motor efficiency is improved.

[0009]

In order to achieve this object, a linear motor according to the present invention comprises a cylindrical outer yoke made of a wound iron core and a winding provided inside the outer yoke with a predetermined gap between the outer yoke. A cylindrical center yoke made of an iron core, a pair of side yokes made of a laminated steel plate, and a pair of side yokes made of a laminated steel sheet, which are tightly attached to the end faces of the outer yoke and the center yoke, and fixed to the inside of the outer yoke. It comprises a permanent magnet, a movable coil disposed in a gap between the permanent magnet and the center yoke, and a shaft connected to and integrated with the movable coil and driving the center yoke in the axial direction.

As a result, the eddy current loss in the iron loss is reduced, and the motor efficiency is improved. The outer yoke and the center yoke are made of laminated steel plates.

As a result, eddy current loss in iron loss is reduced, and motor efficiency is improved. Further, a cylindrical center yoke, a yoke member formed by laminating concave thin plates, a permanent magnet fixed to the inner surface of a concave portion of the yoke member, and one end of the yoke member closely contacting the center yoke so that the concave portion faces upward. A plurality of lower yokes, a plurality of upper yokes arranged on the lower yoke with one end of the yoke member being in close contact with the center yoke and the concave portions facing downward, and a gap formed by the concave portions of the upper yoke and the lower yoke. And a shaft connected to and integrated with the movable coil and driven in the center yoke in the axial direction.

As a result, the magnetic flux is diverted to the upper yoke and the lower yoke, and recirculated in the upper and lower yokes, so that the saturation magnetic flux density is high in the thin plate direction of the laminated steel sheet and the iron loss is low. , The eddy current is reduced, iron loss is reduced, and motor efficiency is improved.

A cylindrical yoke having a regular polygonal outer periphery; a yoke member having a laminating surface formed by laminating concave thin plates formed into a trapezoid; a permanent magnet fixed to one end of a concave portion of the yoke member; An environment yoke in which a plurality of trapezoidal upper sides of the yoke member are in close contact with one side of the center yoke outer peripheral polygon and a plurality of concave parts are arranged with the concave portions facing upward, and an upper side of the trapezoid of the yoke member is set as one side of the center yoke outer peripheral polygon A plurality of annular upper yokes arranged in close contact with the concave portion facing downward on the lower yoke; a movable coil disposed in a gap formed by the concave portions of the upper yoke and the lower yoke; Is constituted by a shaft that drives in the axial direction.

Thus, the upper yoke and the lower yoke are arranged circumferentially without any gap, and the magnetic flux can easily pass therethrough, so that the motor efficiency is further improved.

Also, a cylindrical center yoke, a yoke member formed by laminating concave thin plates, a permanent magnet fixed to the inner surface of the concave portion of the yoke member, and one end of the yoke member are brought into close contact with the outer periphery of the center yoke. A lower yoke in which a plurality of recesses are arranged upward with the concave portion facing upward, one end of the yoke member being in close contact with the outer periphery of the center yoke, the concave portion facing downward, and a plurality of upper yokes arranged with a predetermined gap on the lower yoke; It comprises a movable coil arranged in a gap formed by a concave portion of a yoke and a lower yoke, and a shaft connected to and integrated with the movable coil and driving the center yoke in the axial direction.

As a result, the magnetic flux is divided at the upper yoke and the lower yoke, and the return of the magnetic flux is completed at each of the upper yoke and the lower yoke. As a result, eddy current loss and hysteresis loss are reduced, and iron loss is further reduced. Motor efficiency is further improved.

Also, a cylindrical outer yoke, a pair of cylindrical center yokes provided inside the outer yoke at a predetermined gap from the outer yoke and arranged at a predetermined interval from each other; A pair of side yokes that closely connect to the end face of the yoke to connect and integrate the outer yoke and the center yoke, a permanent magnet fixed inside the outer yoke, and a movable coil disposed in a gap between the permanent magnet and the center yoke And a shaft connected and integrated with the movable coil and driven in the center yoke in the axial direction.

As a result, eddy current loss and hysteresis loss are reduced, iron loss is reduced, and motor efficiency is further improved.

Also, a cylindrical outer yoke, a cylindrical center yoke provided inside the outer yoke with a predetermined gap from the outer yoke, and one end face of the outer yoke and the center yoke in close contact with the outer yoke. A side yoke for connecting and integrating the outer yoke and the center yoke, a permanent magnet fixed inside the outer yoke, and a gap between the permanent magnet and the center yoke inserted through the other opening of the outer yoke and the center yoke. A movable coil is provided, and the shaft is connected to and integrated with the movable coil to drive the center yoke in the axial direction.

As a result, eddy current loss and hysteresis loss are reduced, iron loss is reduced, and motor efficiency is improved. Further, since the movable coil can be inserted from the opening, initial positioning of the movable coil at the time of assembling the linear motor is facilitated.

An outer peripheral yoke provided with a plurality of cylindrical radial cutouts in the axial direction; a cylindrical outer radial cutout provided in the outer peripheral yoke with a predetermined gap therebetween; A plurality of center yokes, a pair of side yokes that closely connect the outer peripheral yoke and the end face of the center yoke to connect and integrate the outer peripheral yoke and the center yoke, and a permanent magnet fixed inside the outer peripheral yoke, It comprises a movable coil arranged in a gap between the permanent magnet and the center yoke, and a shaft connected and integrated with the movable coil and driving the center yoke in the axial direction.

As a result, eddy current loss and hysteresis loss are reduced, iron loss is reduced, and motor efficiency is improved.

[0023] Further, it comprises a cylinder provided on the inner surface of the center yoke, and a piston provided on a shaft connected and integrated with the movable coil and driven in the center yoke in the axial direction.

Thus, when used for a motor such as a compressor, there is no need for the user to attach a piston or the like to the shaft, and the overall size is reduced.

Also, a cylindrical outer yoke, a cylindrical center yoke provided inside the outer yoke with a predetermined gap from the outer yoke and also serving as a support, and an end face of the outer yoke and the center yoke are provided. A pair of side yokes that tightly connect and integrate the outer yoke and the center yoke, a permanent magnet fixed inside the outer yoke, a movable coil disposed in a gap between the permanent magnet and the center yoke, It is composed of a piston connected to a coil and provided on a shaft that drives in the axial direction in the center yoke.

Thus, when used for a motor such as a compressor, there is no need for the user to provide a cylinder and attach a piston or the like to the shaft, and the overall size is reduced.

Further, the coil of the differential transformer is provided in the center yoke, and is constituted by a shaft made of a material having a high magnetic permeability.

This eliminates the need for the user to attach a piston position sensor or the like to the shaft when the motor is used for a motor such as a compressor or the like, and the overall size is reduced.

The entire linear motor is covered with a low magnetic permeability material. Thereby, there is no influence of magnetic leakage to the outside.

[0030]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention comprises a cylindrical outer yoke made of a wound core, and a wound core provided inside the outer yoke with a predetermined gap from the outer yoke. A cylindrical center yoke, a pair of side yokes made of a laminated steel plate that is connected to the outer yoke and the center yoke in close contact with the end surfaces of the outer yoke and the center yoke, and a permanent magnet fixed inside the outer yoke. A movable coil disposed in a gap between the permanent magnet and the center yoke, and a shaft connected to and integrated with the movable coil and driven in the center yoke in an axial direction, and a laminated steel plate having a magnetic path formed of a thin plate. The effect of reducing the eddy current loss in the iron loss and improving the motor efficiency is obtained.

According to a second aspect of the present invention, the outer peripheral yoke and the center yoke are made of laminated steel plates.
It has the effect of reducing eddy current loss in iron loss and improving motor efficiency.

According to a third aspect of the present invention, there is provided a yoke member having a cylindrical center yoke, a concave thin plate laminated, a permanent magnet fixed to an inner surface of a concave portion of the yoke member, and one end of the yoke member. A lower yoke in which a plurality of concave yokes are arranged in close contact with the center yoke, an upper yoke in which one end of the yoke member is in close contact with the center yoke and a plurality of concave yokes are arranged on the lower yoke, A laminated steel plate comprising a movable coil disposed in a gap formed by a concave portion of an upper yoke and a lower yoke, and a shaft connected to and integrated with the movable coil and driven in an axial direction in the center yoke, wherein a magnetic path is formed of a thin plate. As a result, the magnetic flux is diverted to the upper yoke and the lower yoke, and recirculated in the upper yoke and the lower yoke. Flux density is high, becomes a yoke structure which iron loss is sufficiently utilize the low characteristics, iron loss is reduced eddy current decreases, with the effect that the motor efficiency is improved.

According to a fourth aspect of the present invention, there is provided a yoke member formed by laminating a cylindrical center yoke having an outer periphery of a regular polygon, laminating concave thin plates and processing the lamination surface into a trapezoid, and one end of a concave portion of the yoke member. An annular lower yoke in which a plurality of permanent magnets fixed to the yoke member and a trapezoidal upper side of the yoke member are in close contact with one side of the center yoke outer peripheral polygon and a plurality of concave portions are arranged upward, and the upper side of the trapezoid of the yoke member is the center yoke. A plurality of annular upper yokes arranged on the lower yoke in close contact with one side of the outer peripheral polygon with the concave portions facing downward, a movable coil disposed in a gap formed by the concave portions of the upper yoke and the lower yoke, and a connection with the movable coil; The center yoke is integrally formed of a shaft that is driven in the axial direction, and an upper yoke,
The lower yoke can be arranged circumferentially without any gap, and the magnetic flux can easily pass therethrough, which has the effect of further improving the motor efficiency.

According to a fifth aspect of the present invention, a cylindrical center yoke, a yoke member formed by laminating concave thin plates, a permanent magnet fixed to an inner surface of a concave portion of the yoke member, and one end of the yoke member are provided. A plurality of lower yokes that are closely attached to the outer periphery of the center yoke and have a plurality of recesses facing upward, and one end of the yoke member is closely attached to the outer periphery of the center yoke and a plurality of recesses are downwardly arranged with a predetermined gap on the lower yoke. An upper yoke, a movable coil disposed in a gap formed by a concave portion of the upper yoke and the lower yoke, and a shaft connected and integrated with the movable coil and axially driving the center yoke. The magnetic flux is divided by the lower yoke, and the return of the magnetic flux can be completed in each of the upper yoke and the lower yoke. Eddy current loss and hysteresis loss are reduced, and iron loss is further reduced. Efficiency has an effect of further improved.

According to a sixth aspect of the present invention, there is provided a cylindrical outer yoke, and a pair of cylindrical centers provided on the inner side of the outer yoke with a predetermined gap from the outer yoke and arranged at a predetermined distance from each other. A yoke, a pair of side yokes that are in close contact with end faces of the outer yoke and the center yoke to connect and integrate the outer yoke and the center yoke, a permanent magnet fixed inside the outer yoke, and the permanent magnet and the center yoke A movable coil disposed in an air gap between the movable coil and a shaft that is connected to and integrated with the movable coil and drives the center yoke in the axial direction.Eddy current loss, hysteresis loss is reduced, and iron loss is reduced. This has the effect that the motor efficiency is further improved.

According to a seventh aspect of the present invention, there is provided a cylindrical outer yoke, a cylindrical center yoke provided inside the outer yoke with a predetermined gap from the outer yoke, and one of the outer yoke and the center yoke. A side yoke for connecting and integrating the outer yoke and the center yoke in close contact with an end surface of the outer yoke, a permanent magnet fixed inside the outer yoke, and the permanent magnet inserted from the other opening of the outer yoke and the center yoke. A movable coil disposed in a gap between the movable coil and a center yoke, and a shaft connected to and integrated with the movable coil and driving the center yoke in the axial direction. Eddy current loss and hysteresis loss are reduced, and iron loss is reduced. And the motor efficiency is further improved. In addition, since the movable coil can be inserted from the opening, there is an effect that the initial positioning of the movable coil when assembling the linear motor is facilitated.

According to the present invention, an outer peripheral yoke provided with a plurality of radial cutouts in the axial direction is provided inside the outer peripheral yoke at a predetermined gap from the outer peripheral yoke. A center yoke provided with a plurality of radial cutouts in the axial direction, a pair of side yokes for connecting and integrating the outer yoke and the center yoke in close contact with end faces of the outer yoke and the center yoke, and an inner side of the outer yoke. And a movable coil disposed in a gap between the permanent magnet and the center yoke, and a shaft connected to and integrated with the movable coil and driven in the center yoke in the axial direction. loss,
This has the effect that hysteresis loss is reduced, iron loss is reduced, and motor efficiency is improved.

According to a ninth aspect of the present invention, a cylinder is provided on the inner surface of the center yoke, and a piston is provided on a shaft connected and integrated with the movable coil to drive the center yoke in the axial direction. When used in a motor such as a compressor, there is no need for the user to attach a piston or the like to the shaft, which has the effect of reducing the overall shape.

According to a tenth aspect of the present invention, there is provided a cylindrical outer yoke, a cylindrical center yoke provided inside the outer yoke with a predetermined gap from the outer yoke and also serving as a cylinder; A pair of side yokes for connecting and integrating the outer yoke and the center yoke in close contact with the end surface of the center yoke, a permanent magnet fixed inside the outer yoke, and a movable magnet disposed in a gap between the permanent magnet and the center yoke. A coil and a piston provided on a shaft connected and integrated with the movable coil and driven in the center yoke in the axial direction. When used for a motor such as a compressor, a user installs a cylinder to provide a piston or the like. Does not need to be attached to the shaft, and has the effect of reducing the overall shape.

According to an eleventh aspect of the present invention, a differential transformer coil is provided in a center yoke and is constituted by a shaft made of a material having a high magnetic permeability. There is no need for the user to attach a piston position sensor or the like to the shaft, and the overall shape is reduced.

According to the twelfth aspect of the present invention, the linear motor is made of a material having a low magnetic permeability covering the entire linear motor, and has an effect of not exerting an influence of magnetic leakage to the outside.

Hereinafter, this embodiment of the present invention will be described with reference to FIGS. (Embodiment 1) FIG. 1 is a partial sectional view showing a first embodiment of a linear motor according to the present invention, and FIG. 2 is an XY sectional view in FIG.

Reference numeral 1 denotes a cylindrical outer yoke, and a permanent magnet 2 is fixed inside the outer yoke 1. The outer yoke 1 is made of a wound core. A cylindrical center yoke 4 is provided inside the outer peripheral yoke 1 with a predetermined gap 3 therebetween. The center yoke 4 is composed of a wound core. A pair of disc-shaped side yokes 5, 5 are fixed to both sides of the outer yoke 1 and the center yoke 4, and the side yokes 5, 5 connect and integrate the outer yoke 1 and the center yoke 4. The side yokes 5, 5 are made of laminated steel plates.

Here, the outer yoke 1 and the center yoke 4
And the laminated steel sheet forming the side yoke 5 is made of a non-directional electromagnetic steel strip (35H440 manufactured by Nippon Steel Corporation).
Etc.), the saturation flux density in the thin plate direction is high,
Iron loss is low.

Since the permanent magnet 2 is surrounded by the outer yoke 1, the center yoke 4, and the side yokes 5, 5, the magnetic flux leaking from the permanent magnet 2 can be reduced. The configuration of the yoke including the outer yoke 1, the center yoke 4, and the side yokes 5 and 5 surrounds the magnetic field generation source and generates a static magnetic field in the gap 3 between the permanent magnet 2 and the center yoke 4.

The movable coil 6 is located in the static magnetic field of the gap 3 between the permanent magnet 2 and the center yoke 4 and has a coil support 7.
And the movable coil 6 and the shaft 8 are connected and integrated. Therefore, the shaft 8 can move directly within the movement range of the coil support 7 in the gap 3. The coil support 7 is made of a non-magnetic material, and may have any shape as long as it can be disposed in the space 3. The shaft 8 is also made of a non-magnetic material, and various shapes can be adopted according to the use of the actuator. The bearing 9 for smoothing the reciprocation of the shaft 8 may have any configuration, but various configurations such as a conventional linear ball bearing and an oil-impregnated metal bearing can be selected.

In the linear motor configured as described above, the magnetic flux 9 generated from the permanent magnet 2 is
Permanent magnet 2 through side yoke 5 and center yoke 4
And a static magnetic field is generated in the gap 3 between the permanent magnet 2 and the center yoke 4. When an alternating current is supplied to the movable coil 6, a thrust proportional to the magnitude of the current and the magnetic flux density of the permanent magnet 2 is generated in the movable coil 6 and transmitted to the shaft 8 via the coil support 7.

Here, the outer yoke 1 and the center yoke 4
Is composed of a wound iron core, and the side yoke 5 is composed of a laminated steel sheet, so that eddy currents are reduced and iron loss is reduced.
Therefore, the motor efficiency is improved.

As described above, the linear motor of this embodiment is
A cylindrical outer yoke 1 made of a wound core, a cylindrical center yoke 4 made of a wound core provided inside the outer yoke with a predetermined gap from the outer yoke 1, and the outer yoke 1 and the center yoke 4. A pair of side yokes 5 and 5 made of laminated steel plates which are connected and integrated with the outer yoke 1 and the center yoke 4 in close contact with an end face; a permanent magnet 2 fixed inside the outer yoke 1; It comprises a movable coil 6 arranged in the gap 3 between the yokes 4 and a shaft 8 connected and integrated with the movable coil 6 and driving the center yoke 4 in the axial direction.

Therefore, by forming the magnetic path with a laminated steel plate made of a thin plate, the magnetic path has an effect of reducing eddy current loss in iron loss and improving motor efficiency.

(Embodiment 2) FIG. 3 is a partial sectional view showing a second embodiment of the linear motor according to the present invention, and FIG. 4 is an XY sectional view in FIG.

Reference numeral 101 denotes a cylindrical outer yoke, and a permanent magnet 2 is fixed inside the outer yoke 101. The outer yoke 101 is made of a laminated steel plate. A cylindrical center yoke 104 is provided inside the outer peripheral yoke 101 with a predetermined gap 3 therebetween. The center yoke 104 is made of a laminated steel plate. A pair of disc-shaped side yokes 5, 5 are fixed to both sides of the outer yoke 101 and the center yoke 104, and the side yokes 5, 5 are
01 and the center yoke 104 are connected and integrated. The side yokes 5, 5 are made of laminated steel plates.

Here, the laminated steel sheets constituting the outer yoke 101, the center yoke 104, and the side yokes 5 are made of non-directional electromagnetic steel strip (such as 35H440 made by Nippon Steel), and the saturation magnetic flux in the thin plate direction is used. High density and low iron loss.

When the permanent magnet 2 is surrounded by the outer yoke 101, the center yoke 104, and the side yokes 5, 5, the magnetic flux leakage from the permanent magnet 2 can be reduced. The configuration of the yoke including the outer yoke 101, the center yoke 104, and the side yokes 5, 5 surrounds the magnetic field generation source and generates a static magnetic field in the gap 3 between the permanent magnet 2 and the center yoke 104.

The movable coil 6 is located in the static magnetic field in the gap 3 between the permanent magnet 2 and the center yoke 104, and the coil support 7 is arranged so that the movable coil 6 and the shaft 8 are connected and integrated. Therefore, the shaft 8 can move directly within the movement range of the coiled support 7 in the gap 3. The support with coil 7 is made of a non-magnetic material, and may have any shape as long as it can be arranged in the gap 3. The shaft 8 is also made of a non-magnetic material, and various shapes can be adopted according to the use of the actuator. The bearing 9 for smoothing the reciprocation of the shaft 8 may have any configuration, but various configurations such as a conventional linear ball bearing and an oil-impregnated metal bearing can be selected.

In the linear motor configured as described above, the magnetic flux 9 generated from the permanent magnet 2
1, the side yoke 5 and the center yoke 104 return to the permanent magnet 2 and the permanent magnet 2 and the center yoke 1
A static magnetic field is generated in the gap 3 between the magnetic heads 04. When an alternating current is supplied to the movable coil 6, a thrust proportional to the magnitude of the current and the magnetic flux density of the permanent magnet 2 is generated in the movable coil 6 and transmitted to the shaft 8 via the coil support 7.

Here, since the outer yoke 101, the center yoke 104, and the side yoke 5 are made of laminated steel plates, eddy currents are reduced, so that iron loss is reduced. Therefore, the motor efficiency is improved.

As described above, the linear motor of this embodiment is
In the linear motor according to the first aspect, the outer peripheral yoke, the center yoke, and the side yoke are made of laminated steel plates.

Therefore, since the magnetic path is formed of a laminated steel sheet made of a thin plate, it has an effect of reducing eddy current loss in iron loss and improving motor efficiency.

(Embodiment 3) FIG. 5A is a partial sectional view showing a third embodiment of the linear motor according to the present invention, and FIG. 6 is an XY sectional view in FIG. FIG. 7 shows a yoke member 10 which is a component of the present linear motor.

The yoke member 10 has a configuration in which concave thin plates are laminated, and a permanent magnet 11 is fixed to the inner surface of the concave portion of the yoke member 10. Here, the laminated steel sheet constituting the yoke member 10 is made of a non-oriented electromagnetic steel strip (Nippon Steel 3
5H44), which has characteristics of high saturation magnetic flux density in the thin plate direction and low iron loss.

One end of the yoke member 10 is brought into close contact with a cylindrical center yoke 12 and a plurality of concave portions are arranged upward to form a lower yoke 13. One end of the yoke member 10 is closely attached to the center yoke 12 and a plurality of recesses are arranged on the lower yoke 13 with the concave portions facing downward to form an upper yoke 14.

Since the permanent magnet 11 is surrounded by the upper yoke 14 and the lower yoke 13, the leakage magnetic flux from the permanent magnet 11 can be reduced. The configuration of the yoke including the upper yoke 14 and the lower yoke 13 surrounds the magnetic field generation source, and the permanent magnet 11, the upper yoke 14, and the lower yoke 1
A static magnetic field is generated in the gap 15 between the three.

The movable coil 16 is located in the static magnetic field of the gap 15 between the permanent magnet 11, the upper yoke 14, and the lower yoke 13, and the coil support 17 is arranged to connect and integrate the movable coil 16 and the shaft 18. It is. Therefore, the shaft 1
8 can be moved directly within the movement range of the coil support 17 in the gap 15.

In the linear motor configured as described above, the magnetic flux 19 generated from the permanent magnet 11
4 circulates through the various thin plates of the upper yoke 14 and
3 circulates through each thin plate of the lower yoke 13 and
And a static magnetic field is generated in the gap 15 between the permanent magnet 11 and the upper yoke 14 and between the lower yoke 13. When an alternating current is supplied to the movable coil 16, the movable coil 1
6 generates a thrust proportional to the magnitude of the current and the magnetic flux density of the permanent magnet 11,
It is conveyed to 8.

Since the yoke is divided into an upper yoke 14 and a lower yoke 13 and is made of a laminated steel plate, the magnetic flux 19 is diverted to the upper yoke 14 and the lower yoke 13, respectively. By refluxing at
A yoke configuration that makes full use of the characteristics of high saturation magnetic flux density and low iron loss in the thin plate direction of the laminated steel sheet is provided, and eddy current is reduced to reduce iron loss. Therefore, the motor efficiency is improved.

As described above, the linear motor of this embodiment is
A cylindrical center yoke 12, a yoke member 10 in which concave thin plates are laminated, a permanent magnet 11 fixed to the inner surface of a concave portion of the yoke member, and a concave portion in which one end of the yoke member 10 is in close contact with the center yoke 12 A plurality of lower yokes 13 arranged one above the other, a plurality of upper yokes 14 arranged on the lower yoke 13 with one end of the yoke member 10 in close contact with the center yoke 12 and a concave portion facing downward, It comprises a movable coil 16 disposed in a gap 15 formed by a recess 14 and a concave portion of the lower yoke 13, and a shaft 18 connected and integrated with the movable coil 16 to drive the center yoke 12 in the axial direction.

Therefore, by dividing the yoke into an upper yoke 14 and a lower yoke 13 and using a laminated steel plate, the magnetic flux 19 is diverted to the upper yoke 14 and the lower yoke 13, respectively.
By circulating in each of the thin plates of the upper yoke 14 and the lower yoke 13, a yoke configuration is obtained in which the saturation magnetic flux density is high in the thin plate direction of the laminated steel sheet and the iron loss is sufficiently utilized, and eddy current is reduced. Is reduced. Therefore, there is an effect that the motor efficiency is improved.

(Embodiment 4) FIG. 8 is a partial sectional view showing a fourth embodiment of the linear motor according to the present invention, and FIG. 9 is an XY sectional view in FIG. FIG. 10 shows a yoke member 20 which is a component of the present linear motor.

The yoke member 20 has a configuration in which concave thin plates are laminated and the lamination surface is processed into a trapezoidal shape. A permanent magnet 21 is fixed to the inner surface of the concave portion of the yoke member 20. Here, the laminated steel sheet constituting the yoke member 20 uses a non-directional electromagnetic steel strip (such as 35H440 manufactured by Nippon Steel Corporation), and has characteristics of high saturation magnetic flux density in the thin plate direction and low iron loss. doing.

A cylindrical center yoke 2 having a regular polygonal outer periphery
The upper side of the trapezoidal shape of the trapezoidal yoke member 20 is closely attached to one side of the outer peripheral polygon 2 and a plurality of concave portions are arranged upward to form a circular lower yoke 23. A plurality of circular upper yokes 24 are arranged on the lower yoke 23 with the upper side of the trapezoid of the yoke member 20 closely contacting one side of the outer peripheral polygon of the center yoke 22 and the concave portions facing downward.
Is composed.

Since the permanent magnet 21 is surrounded by the upper yoke 24 and the lower yoke 23, the magnetic flux leakage from the permanent magnet 21 can be reduced. The configuration of the yoke including the upper yoke 24 and the lower yoke 23 surrounds the magnetic field generating source, and generates a static magnetic field in the gap 25 between the permanent magnet 21 and the upper and lower yokes 23.

The movable coil 26 is located in the static magnetic field of the gap 25 between the permanent magnet 21 and the upper yoke 24 and the lower yoke 23, and the coil support 27 is arranged to connect and integrate the movable coil 26 and the shaft 28. It is. Therefore, the shaft 2
8 can move directly within the movement range of the coil support 27 in the gap 25.

In the linear motor configured as described above, the magnetic flux 29 generated from the permanent magnet 21
4 circulates through each thin plate of the upper yoke 24 and
Then, it circulates in each thin plate of the lower yoke 23, returns to the permanent magnet 21, and generates a static magnetic field in the gap 25 between the permanent magnet 21 and the upper yoke 24 and between the lower yoke 23. When an alternating current is supplied to the movable coil 26, the movable coil 26
Generates a thrust in proportion to the magnitude of the current and the magnetic flux density of the permanent magnet 21.
Conveyed to.

Since the yoke is divided into an upper yoke 24 and a lower yoke 23 and is made of a laminated steel plate, the magnetic flux 29 is diverted to the upper yoke 24 and the lower yoke 23, respectively. By refluxing at
A yoke configuration that makes full use of the characteristics of high saturation magnetic flux density and low iron loss in the thin plate direction of the laminated steel sheet is provided, and eddy current is reduced to reduce iron loss. The upper yoke 24 and the lower yoke 23
Are arranged annularly with no gaps, thereby facilitating the passage of magnetic flux. Therefore, the motor efficiency is further improved.

As described above, the linear motor of this embodiment is
A yoke member 20 in which a cylindrical center yoke 22 whose outer periphery is a regular polygon and a concave thin plate are laminated and the lamination surface is processed into a trapezoid.
And a plurality of permanent magnets 21 fixed to one end of the concave portion of the yoke member 20, and a plurality of the trapezoidal upper sides of the yoke member 20 closely contacting one side of the outer peripheral polygon of the center yoke 22 with the concave portions facing upward. An annular lower yoke 23, an annular upper yoke 24 in which a plurality of trapezoidal upper sides of the yoke member 20 are closely attached to one side of an outer peripheral polygon of the center yoke 22 and a plurality of concave parts are arranged on the lower yoke 23 with the concave portions facing downward; It comprises a movable coil 26 disposed in a gap 25 formed by a concave portion of the upper yoke 24 and the lower yoke 23, and a shaft 28 connected and integrated with the movable coil 26 and driving the center yoke 22 in the axial direction.

Therefore, by dividing the yoke into the upper yoke 24 and the lower yoke 23 and using a laminated steel plate, the magnetic flux 29 is diverted to the upper yoke 24 and the lower yoke 23, respectively.
By circulating in each of the thin plates of the upper yoke 24 and the lower yoke 23, a yoke configuration is provided that makes full use of the characteristic that the saturation magnetic flux density is high in the thin plate direction of the laminated steel plate and the iron loss is low. Is reduced. In addition, since the upper yoke 24 and the lower yoke 23 are annularly arranged without any gap, the magnetic flux 29 can easily pass through. Therefore, the motor efficiency is further improved.

(Embodiment 5) FIG. 11 is a partial sectional view showing a fifth embodiment of the linear motor according to the present invention.
2 is an XY cross-sectional view in FIG. The yoke member, which is a component of the present linear motor, has the same configuration as that of FIG. 10 and will not be described.

A cylindrical center yoke 3 having a regular polygonal outer periphery
An annular lower yoke 31 is formed by closely contacting the upper side of the trapezoidal shape of the trapezoidal yoke member 20 with one side of the outer peripheral polygon 0 and arranging a plurality of concave portions upward. Then, the upper side of the trapezoid of the yoke member 20 is in close contact with one side of the outer peripheral polygon of the center yoke 30 and a plurality of predetermined gaps 32 are provided on the lower yoke 31 with the concave portions facing downward to form a circular shape. The yoke 33 is constituted.

The movable coil 34 is located within a static magnetic field in a gap 35 between the permanent magnet 21 and the upper yoke 33 and the lower yoke 31, and a coil support 36 is arranged to connect and integrate the movable coil 34 and the shaft 37. It is. Therefore, the shaft 3
7 can be moved directly within the movement range of the coil support 35 in the gap 32.

In the linear motor configured as described above, the magnetic flux 38 generated from the permanent magnet 21
3 circulates through each thin plate of the upper yoke 33 and
Then, it circulates in each thin plate of the lower yoke 31, returns to the permanent magnet 21, and generates a static magnetic field in the gap 32 between the permanent magnet 21 and the upper yoke 33 and between the lower yoke 31. When an alternating current is supplied to the movable coil 34, the movable coil 34
Generates a thrust in proportion to the magnitude of the current and the magnetic flux density of the permanent magnet 21.
Conveyed to.

Since the yoke is divided into an upper yoke 33 and a lower yoke 31 and is made of a laminated steel plate, the magnetic flux 38 is diverted to the upper yoke 33 and the lower yoke 31, respectively. By refluxing at
A yoke configuration that makes full use of the characteristics of high saturation magnetic flux density and low iron loss in the thin plate direction of the laminated steel sheet is provided, and eddy current is reduced to reduce iron loss. The upper yoke 33 and the lower yoke 31
Are arranged circumferentially without any gap, so that the magnetic flux 38
Is easy to pass. Further, by providing the predetermined gap 32 between the upper yoke 33 and the lower yoke 31, the magnetic flux 37 is divided at the upper yoke 33 and the lower yoke 31, and the return of the magnetic flux 37 is completed at each of the upper yoke 33 and the lower yoke 31. Thereby, eddy current loss and hysteresis loss are reduced, and iron loss is further reduced. Therefore, the motor efficiency is further improved.

As described above, the linear motor of this embodiment is
A cylindrical center yoke 30 whose outer periphery is a regular polygon, and a yoke member 20 obtained by laminating concave thin plates and processing the lamination surface into a trapezoid.
A permanent magnet 21 fixed to one end of the concave portion of the yoke member 20; and a plurality of circles in which the upper side of the trapezoid of the yoke member 20 is closely attached to one side of the outer peripheral polygon of the center yoke 30 and the concave portion is directed upward. Lower yoke 30 and the lower yoke 31 with the upper side of the trapezoid of the yoke member 20 in close contact with one side of the outer peripheral polygon of the center 30 with the concave portion facing downward.
A plurality of annular upper yokes 33 provided with a predetermined gap above
A movable coil 34 disposed in a gap 32 formed by concave portions of the upper yoke 33 and the lower yoke 31;
4 and a shaft 37 that is connected and integrated to drive the center yoke 30 in the axial direction.

Therefore, by providing the predetermined gap 32 between the upper yoke 33 and the lower yoke 31, the magnetic flux 38 is divided by the upper yoke 33 and the lower yoke 31, and the magnetic flux 37 is divided by the upper yoke 33 and the lower yoke 31, respectively. When the reflux is completed, eddy current loss and hysteresis loss are reduced, and iron loss is further reduced. Therefore, the motor efficiency is further improved.

(Embodiment 6) FIG. 13 is a partial sectional view showing a sixth embodiment of the linear motor according to the present invention.
FIG. 4 is a sectional view taken along the line XY in FIG.

Reference numeral 41 denotes a cylindrical outer yoke, and a permanent magnet 42 is fixed inside the outer yoke 41.
A pair of cylindrical center yokes 44, 44 spaced apart from each other by a predetermined space 43 and a predetermined gap 43 are provided inside the outer yoke 41. A pair of disc-shaped side yokes 45, 45 are fixed to both sides of the outer yoke 41 and the center yoke 44, and the side yokes 45, 45 integrally connect the outer yoke 41 and the center yokes 44, 44.

The movable coil 46 is located in the static magnetic field in the space 43 between the permanent magnet 42 and the center yoke 44, and the coil support 47 is arranged so that the movable coil 46 is connected and integrated with the shaft 48. Therefore, the shaft 48 has
3 can be moved directly within the moving range of the coil support 47.

In the linear motor configured as described above, when an alternating current is supplied to the movable coil 46, a thrust is generated in the movable coil 46 in proportion to the magnitude of the current and the magnetic flux density of the permanent magnet 42. It is transmitted to the shaft 48 via the support 47.

The magnetic flux 49 generated from the permanent magnet 42 returns to the permanent magnet 42 through the outer yoke 41, the side yoke 45, and the center yoke 44, and generates a static magnetic field in the gap 43 between the permanent magnet 42 and the center yoke 44. .

The predetermined gap 4 between the center yokes 44, 44
By providing 3, the eddy current loss and the hysteresis loss are reduced, and the iron loss is reduced. Therefore, the motor efficiency is improved.

As described above, the linear motor of this embodiment is
A cylindrical outer yoke 41, a pair of cylindrical center yokes 44, 44 provided inside the outer yoke 41 at a predetermined gap from the outer yoke 41 and arranged at a predetermined distance from each other; A pair of side yokes 45, 45 that are in close contact with the end faces of the center yoke 41 and the center yokes 44, 44 to integrally connect the outer yoke 41 and the center yokes 44, 44, and a permanent magnet 42 fixed inside the outer yoke 41. A movable coil 46 disposed in a gap 43 between the permanent magnet 42 and the center yokes 44, 44.
And a shaft 48 connected and integrated with the movable coil 46 to drive the center yokes 44, 44 in the axial direction.

Therefore, the provision of the predetermined gap 43 between the center yokes 44, 44 has the effect of reducing eddy current loss and hysteresis loss, reducing iron loss, and further improving motor efficiency.

(Embodiment 7) FIG. 15 is a partial sectional view showing a seventh embodiment of the linear motor according to the present invention.
6 is a sectional view taken along the line X-Y-Y in FIG.

Reference numeral 51 denotes a cylindrical outer yoke. A permanent magnet 52 is fixed inside the outer yoke 51. A cylindrical center yoke 54 is provided inside the outer peripheral yoke 51 with a predetermined gap 53 therebetween. A disc-shaped side yoke 55 is fixed to one end surface of the outer yoke 51 and the center yoke 54, and the side yoke 55 is
Are connected and integrated.

The outer yoke 51 and the center yoke 54
The movable coil 57 inserted from the other opening 56 of the movable coil 5 is located in the static magnetic field of the gap 53 between the permanent magnet 52 and the center yoke 54,
7 and the shaft 59 are connected and integrated. Therefore, the shaft 59 can move directly within the movement range of the coil support 58 in the gap 53.

In the linear motor configured as described above, the magnetic flux 59 generated from the permanent magnet 52 returns to the permanent magnet 52 through the outer yoke 51, the side yoke 55, and the center yoke 54, and the permanent magnet 52 and the center yoke A static magnetic field is generated in an air gap 53 between 54. When an alternating current is supplied to the movable coil 56, the movable coil 5
6, a thrust proportional to the magnitude of the current and the magnetic flux density of the permanent magnet 52 is generated, and the thrust is applied to the shaft 5 via the coil support 57.
It is conveyed to 8.

By providing an opening in one of the outer yoke 51 and the center yoke 54, eddy current loss and hysteresis loss are reduced, and iron loss is reduced. Therefore, the motor efficiency is improved. Further, since the movable coil 56 can be inserted through the opening, initial positioning of the movable coil at the time of assembling the linear motor is facilitated.

As described above, the linear motor of this embodiment is
A cylindrical outer yoke 51, the outer yoke 54, a side yoke 55 that is in close contact with one end surface of the outer yoke 51 and the center yoke 54 to integrally connect the outer yoke 51 and the center yoke 54, A permanent magnet 52 fixed to the inside of the yoke 51, a movable coil 57 inserted through the other opening 56 of the outer peripheral yoke 51 and the center yoke 55 and arranged in a gap between the permanent magnet 52 and the center yoke 55, A shaft 59 is connected and integrated with the coil 57 and drives the inside of the center yoke 54 in the axial direction.

Therefore, by providing the opening 56 on one of the outer yoke 51 and the center yoke 54, eddy current loss and hysteresis loss are reduced, and iron loss is reduced. Therefore, the motor efficiency is improved. In addition, since the movable coil 57 can be inserted from this opening, there is an effect that the initial positioning of the movable coil when assembling the linear motor is facilitated.

(Eighth Embodiment) FIG. 17A is a partial sectional view showing an eighth embodiment of the linear motor according to the present invention.
FIG. 18 is a sectional view taken along the line XY in FIG.

Reference numeral 111 denotes a radial cutout 12 in the axial direction.
This is a cylindrical outer yoke provided with a plurality of zeros, and a permanent magnet 112 is fixed inside the outer yoke 111. A cylindrical center yoke 114, 114 provided with a plurality of radial cutouts 121 in the axial direction with a predetermined gap 113 interposed between the outer yoke 111 and the outer yoke 111.
It is provided inside. A pair of disc-shaped side yokes 1 are provided on both sides of the outer peripheral yoke 111 and the center yoke 114.
15 and 115 are fixed, and the side yokes 115 and 1 are fixed.
15 is the outer peripheral yoke 111 and the center yoke 114;
114 is connected and integrated.

The movable coil 116 is located in a static magnetic field in a gap 113 between the permanent magnet 112 and the center 114, and a coil support 117 is arranged to connect and integrate the movable coil 116 and the shaft 118. Therefore, the shaft 11
8 can be moved directly within the movement range of the coil support 117 in the gap 113.

In the linear motor configured as described above, when an alternating current is supplied to the movable coil 116, a thrust is generated in the movable coil 116 in proportion to the magnitude of the current and the magnetic flux density of the permanent magnet 112. It is transmitted to the shaft 118 via the support 117.

The magnetic flux 119 generated from the permanent magnet 112 returns to the permanent magnet 112 through the outer yoke 111, the side yoke 115, and the center yoke 114, and generates a static magnetic field in the gap 113 between the permanent magnet 112 and the center yoke 114. .

The magnetic flux 119 passes through the outer yoke 111, the side yoke 115, and the center yoke 114, and the permanent magnet 1
The eddy current (in the direction perpendicular to the magnetic flux) generated when returning to 12 is separated by radial cutouts 120 and 121 provided in the outer yoke 111 and the center yoke 114. Therefore, eddy current loss is reduced, iron loss is reduced, and motor efficiency is improved.

As described above, the linear motor of this embodiment is
An outer peripheral yoke 111 provided with a plurality of cylindrical radial cutouts in the axial direction, and a radial radial cutout provided in the outer circumferential yoke 111 with a predetermined gap provided between the outer peripheral yoke 111 and the cylindrical yoke 111. A plurality of center yokes 114; and a pair of side yokes 1 that are in close contact with the end faces of the outer yoke 111 and the center yoke 114 to connect and integrate the outer yoke 111 and the center yoke 114.
15, a permanent magnet 112 fixed inside the outer peripheral yoke 111, and a movable coil 116 disposed in a gap 113 between the permanent magnet 112 and the center yoke 114.
And a shaft 118 connected and integrated with the movable coil 116 and driven in the center yoke 114 in the axial direction.

Therefore, the eddy current generated by the magnetic flux is divided by the radial cutouts 120 and 121 provided in the outer yoke 111 and the center yoke 114, so that the eddy current loss is reduced and the iron loss is reduced. This has the effect that the motor efficiency is further improved.

(Embodiment 9) FIG. 19 is a partial sectional view showing a ninth embodiment of the linear motor according to the present invention.
0 is a sectional view taken along the line XY in FIG.

Numeral 61 denotes a cylindrical outer yoke, and a permanent magnet 62 is fixed inside the outer yoke 61.
A cylindrical center yoke 64 is provided inside the outer peripheral yoke 61 with a predetermined gap 63 therebetween. Further, a cylinder 65 is provided on the inner surface of the center yoke 64. A disk-shaped side yoke 66 is fixed to one end surface of the outer yoke 61 and the center yoke 64, and the side yoke 66 connects and integrates the outer yoke 61 and the center yoke 64.

The outer yoke 61 and the center yoke 64
The movable coil 68 inserted from the other opening 67 is located in the static magnetic field of the gap 63 between the permanent magnet 62 and the center yoke 64, and the movable coil 6
8 and the shaft 70 are connected and integrated. A piston 71 is connected to the tip of the shaft 70, and reciprocates in the cylinder 65 in the axial direction. Reference numeral 72 denotes a compression chamber, which also compresses refrigerant gas and the like by reciprocation of the piston 71.

In the linear motor configured as described above, the magnetic flux 73 generated from the permanent magnet 62 returns to the permanent magnet 62 through the outer yoke 61, the side yoke 65, and the center yoke 64, and the permanent magnet 62 and the center yoke A static magnetic field is generated in the gap 63 between the gaps 64. When an alternating current is supplied to the movable coil 67, the movable coil 6
8, a thrust proportional to the magnitude of the current and the magnetic flux density of the permanent magnet 62 is generated.
0, the piston 71 reciprocates in the cylinder 65 to compress the refrigerant gas and the like.

The cylinder 65 is provided on the inner surface of the center yoke 64, and the piston 71 is combined with the tip of the shaft 70, so that the linear motor and the piston 70 are integrated.
Therefore, when used in a motor such as a compressor, there is no need for the user to attach a piston or the like to the shaft, and there is an advantage that the overall shape is reduced.

As described above, the linear motor of this embodiment is
A cylinder 65 provided on the inner surface of the center yoke 64,
It comprises a piston 71 provided on a shaft 70 that is connected and integrated with the movable coil 68 and drives the center yoke 64 in the axial direction.

Therefore, when used in a motor such as a compressor, there is no need for the user to attach a piston or the like to the shaft, and the overall shape is reduced.

(Embodiment 10) FIG. 21 is a partial sectional view showing a tenth embodiment of the linear motor according to the present invention.
FIG. 22 is an X-Y-Y sectional view in FIG.

Numeral 81 denotes a cylindrical outer yoke, and a permanent magnet 82 is fixed inside the outer yoke 81.
A cylindrical center yoke 84 is provided inside the outer yoke 81 with a predetermined gap 83 interposed between the outer yoke 81 and serves as a cylinder 85 of the compressor. A disc-shaped side yoke 86 is fixed to one end surface of the outer yoke 81 and the center yoke 84, and the side yoke 86 connects and integrates the outer yoke 81 and the center yoke 84.

The outer yoke 81 and the center yoke 84
The movable coil 88 inserted from the other opening 87 of the movable coil 8 is located in the static magnetic field of the gap 83 between the permanent magnet 82 and the center yoke 84, and the coil support 89 is disposed thereon.
8 and the shaft 90 are connected and integrated. A piston 91 is connected to the tip of the shaft 90, and reciprocates in the cylinder 85 in the axial direction. Reference numeral 92 denotes a compression chamber, which compresses refrigerant gas and the like by reciprocating the piston 91.

Here, the center yoke 84 is made of pure iron, cast iron, or the like as a material having a low iron loss as a yoke material, a large saturation magnetic flux density, and a good workability as a cylinder material. .

In the linear motor configured as described above, the magnetic flux 93 generated from the permanent magnet 82 returns to the permanent magnet 82 through the outer yoke 81, the side yoke 85, and the center yoke 84, and the permanent magnet 82 and the center yoke A static magnetic field is generated in a gap 83 between the gaps 84. When an alternating current is supplied to the moving coil 88, the moving coil 8
A thrust proportional to the magnitude of the current and the magnetic flux density of the permanent magnet 82 is generated in the shaft 8, and the thrust is generated through the coil support 89.
0, the piston 91 reciprocates in the cylinder 81 and compresses refrigerant gas and the like.

The center yoke 84 also serves as a cylinder 85 of the compressor.
By combining these, the linear motor and the piston 91 were integrated. Therefore, when used for a motor such as a compressor, there is no need for the user to attach a piston or the like to the shaft, and there is an advantage that the overall shape is further reduced.

As described above, the linear motor of this embodiment is
A cylindrical outer yoke 81, a cylindrical center yoke 84 provided inside the outer yoke 81 with a predetermined gap 83 interposed between the outer yoke 81 and a cylinder 85, and end faces of the outer yoke 81 and the center yoke 84. A pair of side yokes 85 for connecting and integrating the outer yoke 81 and the center yoke 84 into close contact with the outer yoke 81;
, A movable coil 88 disposed in a gap 83 between the permanent magnet 82 and the center yoke 84, and a shaft connected to and integrated with the movable coil 88 to drive the inside of the center yoke 84 in the axial direction. The piston 90 includes a piston 91.

Therefore, the center yoke 84 also serves as the cylinder 85 of the compressor, and the piston 91 is combined with the tip of the shaft 90, so that the linear motor and the piston 91 are integrated. Therefore, when used for a motor such as a compressor or the like, there is no need for the user to provide the cylinder 91 and attach the piston or the like to the shaft 90, which has the effect of reducing the overall shape.

(Embodiment 11) FIG. 23 is a partial sectional view showing an eleventh embodiment of the linear motor according to the present invention.
FIG. 24 is a sectional view taken along the line XY in FIG. Here, the configuration of the yoke is the same as that of the tenth embodiment, and a detailed description is omitted.

In the center yoke 84, a coil 130 of a differential transformer as a piston position sensor is provided. The movable coil 88 inserted from the other opening 87 of the outer yoke 81 and the center yoke 84 is located within the static magnetic field of the gap 83 between the permanent magnet 82 and the center yoke 84, and is movable by disposing the coil support 89. The coil 88 and the shaft 90 are connected and integrated. The shaft 9
Numeral 0 is made of a high magnetic material such as pure iron, electromagnetic mild steel, and ferrite. A piston 91 is connected to the tip of the magnetic material and reciprocates in the cylinder 85 in the axial direction. Reference numeral 92 denotes a compression chamber, which compresses refrigerant gas and the like by reciprocating the piston 91.

In the linear motor configured as described above, the magnetic flux 93 generated from the permanent magnet 82 returns to the permanent magnet 82 through the outer yoke 81, the side yoke 85, and the center yoke 84, and also returns to the permanent magnet 82 and the center yoke. A static magnetic field is generated in a gap 83 between the gaps 84. When an alternating current is supplied to the moving coil 88, the moving coil 8
A thrust proportional to the magnitude of the current and the magnetic flux density of the permanent magnet 82 is generated in the shaft 8, and the thrust is generated through the coil support 89.
0, the piston 91 reciprocates in the cylinder 81 and compresses refrigerant gas and the like.

The shaft 90 reciprocates in the coil 130 of the differential transformer according to the reciprocation of the piston 91,
A voltage corresponding to the position of the piston 91 is induced in the coil 130, so that the piston can be positioned.

A center yoke 84 also serves as a cylinder 85 of the compressor.
The linear motor, the piston, and the position sensor were integrated by incorporating a differential transformer, which is a piston position sensor, into the motor. Therefore, when used in a motor such as a compressor, there is no need for the user to attach the piston and the position sensor to the shaft, and there is an advantage that the overall shape is further reduced.

As described above, the linear motor of this embodiment is
The linear motor according to claim 10, comprising a coil 130 of a differential transformer provided in the center yoke 84 and a shaft 90 made of a material having high magnetic permeability.

Therefore, when used for a motor such as a compressor, there is no need for the user to attach the piston and the position sensor to the shaft, and there is an advantage that the overall shape is further reduced.

(Embodiment 12) FIG. 25 is a partial sectional view showing a twelfth embodiment of the linear motor according to the present invention.
FIG. 26 is a sectional view taken along the line XY in FIG.

Reference numeral 141 denotes a cylindrical outer yoke, and a permanent magnet 142 is fixed inside the outer yoke 141. A cylindrical center yoke 144 is provided inside the outer yoke 141 with a predetermined gap 143 therebetween. A pair of disk-shaped side yokes 14 are provided on both sides of the outer yoke 141 and the center yoke 144.
5 and 145 are fixed, and the side yokes 145 and 14 are fixed.
5 connects and integrates the outer peripheral yoke 141 and the center yoke 144.

The movable coil 146 is located in the static magnetic field of the air gap 143 between the permanent magnet 142 and the center yoke 144, and the coil support 147 is arranged to connect and integrate the movable coil 146 and the shaft 148. Therefore, the shaft 148 can move directly within the movement range of the coil support 147 in the gap 143. A piston 149 is connected to the tip of the shaft 148, and reciprocates in the cylinder 150 in the axial direction. Reference numeral 151 denotes a compression chamber, which compresses a refrigerant gas or the like by reciprocating the piston 149. The entire linear motor is covered with a low magnetic permeability material outer shell 152.

Therefore, since the entire linear motor is covered with the outer shell 152 of the low magnetic permeability material, the outer yoke 141 and the side yoke 145 are completely surrounded, and no magnetic leakage occurs.

As described above, the linear motor of this embodiment is
It is composed of a low magnetic permeability material outer shell 152 covering the entire linear motor.

Therefore, since the entire linear motor is covered with the outer shell 152 of the low magnetic permeability material, the outer yoke 141 and the side yoke 145 are completely surrounded, so that there is no magnetic leakage.

[0136]

As described above, the present invention provides a cylindrical outer yoke made of a wound iron core, and a cylindrical center yoke made of a wound iron core provided inside the outer circumferential yoke with a predetermined gap therebetween. A pair of side yokes made of a laminated steel plate by connecting and integrating the outer yoke and the center yoke in close contact with the end faces of the outer yoke and the center yoke; a permanent magnet fixed inside the outer yoke; and the permanent magnet and the center yoke A movable coil disposed in a gap between the movable coil and a shaft connected to and integrated with the movable coil and driven in the axial direction in the center yoke.The magnetic path is formed by a laminated steel plate made of a thin plate. The eddy current loss in the loss is reduced, and the motor efficiency is improved.

Further, in the linear motor according to the first aspect, the outer yoke, the center yoke, and the side yoke are constituted by laminated steel sheets, and the magnetic path is formed by a laminated steel sheet made of a thin plate. Eddy current loss is reduced, and motor efficiency is improved.

Also, a cylindrical center yoke, a yoke member formed by laminating concave thin plates, a permanent magnet fixed to the inner surface of the concave portion of the yoke member, and one end of the yoke member closely contacting the center yoke and forming the concave portion A plurality of lower yokes, a plurality of lower yokes, one end of the yoke member being in close contact with the center yoke, and a plurality of upper yokes arranged on the lower yoke with the concave portions facing downward, and the upper yoke and the lower yoke. The movable coil arranged in the gap formed by the concave portion, the shaft is connected to the movable coil and integrated and driven in the center yoke in the axial direction, and the magnetic path is formed by a laminated steel plate made of a thin plate. The magnetic flux is diverted to the upper yoke and the lower yoke, respectively, and recirculated in the upper yoke and the lower yoke. Iron loss becomes sufficiently take yoke constituting the low characteristics, iron loss is reduced eddy current decreases, the motor efficiency is improved.

A cylindrical center yoke having a regular polygonal outer periphery, a yoke member formed by laminating concave thin plates and processing the lamination surface into a trapezoid, a permanent magnet fixed to one end of the concave portion of the yoke member, An annular lower yoke in which the upper side of the trapezoid of the yoke member is in close contact with one side of the center yoke outer peripheral polygon and a plurality of concave parts are arranged with the concave portions facing upward; A plurality of annular upper yokes arranged on the lower yoke with the concave portions facing downward, a movable coil disposed in a gap formed by the concave portions of the upper yoke and the lower yoke, and the center yoke connected and integrated with the movable coils. The upper yoke and lower yoke can be arranged circumferentially without any gaps by comprising a shaft that drives the inside in the axial direction, making it easier for magnetic flux to pass through and further improving motor efficiency That.

Also, a cylindrical center yoke, a yoke member formed by laminating concave thin plates, a permanent magnet fixed to the inner surface of the concave portion of the yoke member, and one end of the yoke member are adhered to the outer periphery of the center yoke. A lower yoke in which a plurality of recesses are arranged upward with the concave portion facing upward, one end of the yoke member being in close contact with the outer periphery of the center yoke, the concave portion facing downward, and a plurality of upper yokes arranged with a predetermined gap on the lower yoke; A movable coil disposed in a gap formed by a concave portion of the yoke and the lower yoke, and a shaft connected and integrated with the movable coil and driving the center yoke in the axial direction, the magnetic flux is divided by the upper yoke and the lower yoke. The return of magnetic flux can be completed in each of the upper and lower yokes, eddy current loss and hysteresis loss are reduced, iron loss is further reduced, and motor efficiency is further improved. .

Further, a cylindrical outer yoke, a pair of cylindrical center yokes provided inside the outer yoke with a predetermined gap from the outer yoke and arranged at a predetermined interval from each other; A pair of side yokes that closely connect to the end face of the yoke to connect and integrate the outer yoke and the center yoke, a permanent magnet fixed inside the outer yoke, and a movable coil disposed in a gap between the permanent magnet and the center yoke And a shaft that is connected and integrated with the movable coil and drives the inside of the center yoke in the axial direction, so that eddy current loss and hysteresis loss are reduced, iron loss is reduced, and motor efficiency is further improved.

Further, a cylindrical outer yoke, a cylindrical center yoke provided inside the outer yoke with a predetermined gap from the outer yoke, and one end face of the outer yoke and the center yoke in close contact with the outer yoke. A side yoke for connecting and integrating the outer yoke and the center yoke, a permanent magnet fixed inside the outer yoke, and a gap between the permanent magnet and the center yoke inserted through the other opening of the outer yoke and the center yoke. The arranging movable coil and the shaft connected to and integrated with the movable coil and configured to drive the center yoke in the axial direction, eddy current loss,
Hysteresis loss is reduced, iron loss is reduced, and motor efficiency is further improved. Further, since the movable coil can be inserted from the opening, initial positioning of the movable coil at the time of assembling the linear motor is facilitated.

An outer peripheral yoke provided with a plurality of cylindrical radial cutouts in the axial direction is provided inside the outer peripheral yoke with a predetermined gap between the outer peripheral yoke and a cylindrical radial radial cutout. A center yoke provided with a plurality of cutouts, the outer yoke, a pair of side yokes that are in close contact with the end surface of the center yoke to connect and integrate the outer yoke and the center yoke, and a permanent magnet fixed inside the outer yoke And a movable coil disposed in the gap between the permanent magnet and the center yoke, and a shaft connected and integrated with the movable coil and axially driving the inside of the center yoke, an eddy current generated by magnetic flux is generated.
Since the cutting is performed by radial cutting in the axial direction provided on the outer yoke and the center yoke, eddy current loss is reduced, iron loss is reduced, and motor efficiency is further improved.

[0144] Further, since it is composed of a cylinder provided on the inner surface of the center yoke and a piston provided on a shaft which is connected and integrated with the movable coil and drives the inside of the center yoke in the axial direction, it is used for a motor such as a compressor. This eliminates the need for the user to attach a piston or the like to the shaft, and has the effect of reducing the overall shape.

Further, a cylindrical outer yoke, a cylindrical center yoke provided inside the outer yoke with a predetermined gap from the outer yoke and also serving as a cylinder, and closely attached to the end surfaces of the outer yoke and the center yoke. A pair of side yokes for connecting and integrating the outer peripheral yoke and the center yoke, a permanent magnet fixed inside the outer peripheral yoke, a movable coil disposed in a gap between the permanent magnet and the center yoke, and the movable coil. By using a piston provided on a shaft that is connected and integrated and axially drives the inside of the center yoke, when used for a motor such as a compressor, there is no need for the user to provide a cylinder and attach the piston or the like to the shaft, The shape becomes smaller as a whole.

Further, in the linear motor according to the tenth aspect, since the linear motor is constituted by the coil 130 of the differential transformer provided in the center yoke 84 and the shaft 90 made of a material having a high magnetic permeability, the linear motor can be used for a motor such as a compressor. This eliminates the need for the user to attach the piston and the position sensor to the shaft, and has the advantage that the overall shape is further reduced.

In addition, since the outer peripheral yoke and the side yoke are completely surrounded by having a low magnetic permeability material covering the entire linear motor, there is an effect that no magnetic leakage occurs.

[Brief description of the drawings]

FIG. 1 is a sectional view of a linear motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the linear motor according to the first embodiment of the present invention;

FIG. 3 is a sectional view of a linear motor according to a second embodiment of the present invention;

FIG. 4 is a sectional view of a linear motor according to a second embodiment of the present invention;

FIG. 5 is a sectional view of a linear motor according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a linear motor according to a third embodiment of the present invention.

FIG. 7 is an external view of a yoke member constituting the linear motor.

FIG. 8 is a sectional view of a linear motor according to a fourth embodiment of the present invention.

FIG. 9 is a sectional view of a linear motor according to a fourth embodiment of the present invention.

FIG. 10 is an external view of a yoke member constituting the linear motor.

FIG. 11 is a sectional view of a linear motor according to a fifth embodiment of the present invention.

FIG. 12 is a sectional view of a linear motor according to a fifth embodiment of the present invention.

FIG. 13 is a sectional view of a linear motor according to a sixth embodiment of the present invention.

FIG. 14 is a sectional view of a linear motor according to a sixth embodiment of the present invention.

FIG. 15 is a sectional view of a linear motor according to a seventh embodiment of the present invention.

FIG. 16 is a sectional view of a linear motor according to a seventh embodiment of the present invention.

FIG. 17 is a sectional view of a linear motor according to an eighth embodiment of the present invention.

FIG. 18 is a sectional view of a linear motor according to an eighth embodiment of the present invention.

FIG. 19 is a sectional view of a linear motor according to a ninth embodiment of the present invention.

FIG. 20 is a sectional view of a linear motor according to a ninth embodiment of the present invention.

FIG. 21 is a sectional view of a linear motor according to a tenth embodiment of the present invention.

FIG. 22 is a sectional view of a linear motor according to a tenth embodiment of the present invention.

FIG. 23 is a sectional view of a linear motor according to an eleventh embodiment of the present invention.

FIG. 24 is a sectional view of a linear motor according to an eleventh embodiment of the present invention.

FIG. 25 is a sectional view of a linear motor according to a twelfth embodiment of the present invention.

FIG. 26 is a sectional view of a linear motor according to a twelfth embodiment of the present invention.

FIG. 27 is a sectional view of a conventional linear motor.

[Explanation of symbols]

 Reference Signs List 1 outer yoke 2 permanent magnet 3 air gap 4 center yoke 5 side yoke 6 movable coil 8 shaft

Claims (12)

[Claims] A cylindrical outer yoke formed of a wound core; a cylindrical center yoke formed of a wound core provided inside the outer yoke with a predetermined gap between the outer yoke and the outer yoke and the center yoke; The outer yoke and the center yoke are integrally connected to the end face, and a pair of side yokes made of a laminated steel plate, a permanent magnet fixed inside the outer yoke, and a gap between the permanent magnet and the center yoke are arranged. A linear motor comprising a movable coil and a shaft connected to and integrated with the movable coil and driven in the center yoke in an axial direction. 2. The linear motor according to claim 1, wherein the outer yoke and the center yoke are made of laminated steel plates. 3. A cylindrical yoke, a yoke member formed by laminating concave thin plates, a permanent magnet fixed to an inner surface of a concave portion of the yoke member, and a concave portion in which one end of the yoke member is in close contact with the center yoke. A plurality of lower yokes, one upper end of the yoke member being in close contact with the center yoke, and a plurality of upper yokes arranged on the lower yoke with the concave portions facing downward, and concave portions of the upper yoke and the lower yoke. A linear motor comprising: a movable coil disposed in an air gap formed of a shaft; and a shaft connected to and integrated with the movable coil and driven in the center yoke in an axial direction. 4. A cylindrical center yoke having an outer periphery of a regular polygon, a yoke member obtained by laminating concave thin plates and processing a lamination surface into a trapezoid, and a permanent magnet fixed to one end of a concave portion of the yoke member. An annular lower yoke in which the upper side of the trapezoid of the yoke member is closely attached to one side of the center yoke outer peripheral polygon and a plurality of concave parts are arranged with the concave portions facing upward, and the upper side of the trapezoid of the yoke member is set as one side of the center yoke outer peripheral polygon. A plurality of annular upper yokes arranged in close contact with the concave portion facing downward on the lower yoke; a movable coil disposed in a gap formed by the concave portions of the upper yoke and the lower yoke; Linear motor consisting of a shaft that drives the shaft in the axial direction. 5. A cylindrical center yoke, a yoke member formed by laminating concave thin plates, a permanent magnet fixed to an inner surface of a concave portion of the yoke member, and one end of the yoke member being in close contact with the outer periphery of the center yoke. A lower yoke in which a plurality of recesses are arranged upward with the concave portion facing upward, one end of the yoke member being in close contact with the outer periphery of the center yoke, the concave portion facing downward, and a plurality of upper yokes arranged with a predetermined gap on the lower yoke; A linear motor comprising: a movable coil disposed in a gap formed by a concave portion of a yoke and a lower yoke; and a shaft connected to and integrated with the movable coil and axially driving the inside of the center yoke. 6. A cylindrical outer yoke, a pair of cylindrical center yokes provided inside the outer yoke with a predetermined gap from the outer yoke and arranged at a predetermined interval from each other; A pair of side yokes that closely connect to the end face of the yoke to connect and integrate the outer yoke and the center yoke, a permanent magnet fixed inside the outer yoke, and a movable coil disposed in a gap between the permanent magnet and the center yoke And a shaft connected and integrated with the movable coil and axially driving the inside of the center yoke. 7. A cylindrical outer yoke, a cylindrical center yoke provided inside the outer yoke with a predetermined gap from the outer yoke, and one end face of the outer yoke and the center yoke in close contact with the outer yoke. A side yoke for connecting and integrating the outer yoke and the center yoke, a permanent magnet fixed to the inside of the outer yoke, a gap between the permanent magnet and the center yoke inserted through the other opening of the outer yoke and the center yoke. A linear motor, comprising: a movable coil disposed in the center yoke; and a shaft connected to and integrated with the movable coil and axially driving the inside of the center yoke. 8. The linear motor for a compressor according to claim 7, comprising a cylinder provided on an inner surface of said center yoke, and a piston provided on a shaft connected and integrated with said movable coil and axially driving inside said center yoke. . 9. An outer peripheral yoke provided with a plurality of cylindrical radial cutouts in the axial direction, and a cylindrical axial radial cutout provided inside the outer peripheral yoke with a predetermined gap therebetween. A plurality of center yokes, a pair of side yokes that closely contact the outer peripheral yoke and the end surface of the center yoke to connect and integrate the outer peripheral yoke and the center yoke, and a permanent magnet and a center fixed inside the outer peripheral yoke. A linear motor comprising a movable coil disposed in a gap between the yokes, and a shaft connected to and integrated with the movable coil and driving the center yoke in an axial direction. 10. A cylindrical outer yoke, a cylindrical center yoke provided inside the outer yoke with a predetermined gap between the outer yoke and also serving as a cylinder, and closely attached to the end surfaces of the outer yoke and the center yoke. A pair of side yokes for connecting and integrating the outer peripheral yoke and the center yoke, a permanent magnet fixed inside the outer peripheral yoke, a movable coil disposed in a gap between the permanent magnet and the center yoke, and the movable coil. A linear motor for a compressor comprising a piston connected and integrated and provided on a shaft for driving the center yoke in the axial direction. 11. The linear motor for a compressor according to claim 10, comprising a coil of a differential transformer provided in said center yoke and a shaft made of a material having a high magnetic permeability. 12. A cylindrical outer yoke, a cylindrical center yoke provided inside the outer yoke and also serving as a cylinder, and integrally connected to the outer yoke and the center yoke in close contact with end faces of the outer yoke and the center yoke. A pair of side yokes, a permanent magnet fixed inside the outer peripheral yoke, a movable coil disposed in a gap between the permanent magnet and the center yoke, and connected to and integrated with the movable coil in an axial direction in the center yoke. A linear motor for a compressor, comprising: a piston provided on a shaft to be driven in a motor; and a low magnetic permeability material shell covering the entire linear motor.