JPH09200992A - Fixing construction of stator magnet in actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily assemble and prevent rattling. SOLUTION: Positioning portions 15 and 16 are respectively formed at both side faces orthogonal to the peripheral direction of a rotor of a stator magnet holding hole 9. The positioning portion 15 is equipped with two magnetic supporting portions 34 and 35 arranged in parallel to the direction of the axis of rotation. The magnet supporting portion 34 is formed by connecting a pair of supporting portions 21 and 22 formed as if extending from the base portion 20 to peripheral direction, an escape portion 24 formed between both supporting portions 21 and 22, and between the tip portions of both supporting portions 21 and 22, and is constituted with a deforming plate portion 26 which deforms in the escape portion 24 by an energizing force from the side of the stator magnet holding hole 9 and a projected strip 28 coming into contact with the side face of a stator magnet 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator magnet fixing structure in a rotary type actuator having a stator magnet on the stator side.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, in a rotary actuator, a stator 53 is constructed by assembling an exciting coil 51, a stator magnet 52 and the like in a housing 50.
There is a structure in which the rotor 54 is positioned with respect to the housing 50. A rotor accommodating hole 55 for accommodating the rotor 54 is formed in the center of the housing 50, and the exciting coils 51 are wound around bobbin portions 56 formed on the left and right sides of the rotor accommodating hole 55, respectively. An insertion hole 57 is formed in each bobbin portion 56 for inserting the exciting magnetic pole of the stator core so as to face the rotor housing hole 55. Stator magnet housing portions 58 are formed at both positions of the housing 50 facing the rotor housing hole 55. The stator magnet 52 is assembled into the stator magnet housing hole 58 from the outside of the housing 50.

When both exciting magnetic poles are alternately excited to different magnetic poles, the rotor 54 is alternately arranged at two different angular positions by the magnetic pole of the exciting magnetic pole and the magnetic poles of both stator magnets 52.

[0004]

By the way, it is desirable that the stator magnet 52 be fixed in the stator magnet accommodating portion 58 so as not to rattle. This is because when the position of the stator magnet 52 changes, the rotor 54 to be positioned at the angular position by the both stator magnets 52 and the two exciting magnetic poles.
This is because there is variation in the angular position of. Further, if there is rattling, there is also a problem that the stator magnet 52 moves in the stator magnet housing hole 58 due to a magnetic field acting from the rotor magnet of the rotor 54 during operation of the actuator, and abnormal noise is generated. .

However, in the above actuator, as shown in FIG. 8, the stator magnet 52 can be easily assembled in the assembling step of assembling the stator magnet 52 in the stator magnet housing hole 58. The outer circumferential dimension k of the stator magnet accommodating portion 5
The inner dimension m in the circumferential direction of 2 is set to be slightly larger.

Because the dimensional variations of the housing 50 and the stator magnet 52 are large, the stator magnet 52
This is because it is difficult to design so as to be pressed into the stator magnet housing hole 58. That is, due to variations in the dimensions of the two, the stator magnet housing hole 5 of the stator magnet 52 is
There may be a case where it becomes difficult to assemble to 8.

Therefore, even if the dimensions of the stator magnets 52 and the stator magnet housing holes 58 vary, the stator magnets 5 will not change.
As described above, the dimensional relationship between the two is set so that the two can be easily assembled.

As a result, this time, when the stator magnet 52 is assembled in the stator magnet housing hole 58, the stator magnet 52 may not be firmly fixed inside the stator magnet housing hole 58 and rattling may occur.

The present invention has been made in order to solve the above problems, and an object thereof is an actuator which can be easily assembled and can surely prevent rattling after the assembly. To provide a structure for assembling the stator magnet.

[0010]

In order to solve the above problems, the invention as set forth in claim 1 is provided with a stator magnet housing hole which is opposed to a rotor housing hole which houses a rotor, in a housing which constitutes a stator. In a stator magnet fixing structure in an actuator for fixing a stator magnet in a position facing a rotor by accommodating the stator magnet in the stator magnet accommodating hole, a rotor circumference is provided in the stator magnet accommodating hole. The stator magnet is provided on at least one of both side surfaces perpendicular to the direction, and is elastically deformed by accommodating the stator magnet in the stator magnet accommodating hole, and the restoring force of the elastic deformation causes the stator magnet to move in the circumferential direction of the rotor. A magnet support for supporting is provided.

According to a second aspect of the present invention, in the first aspect of the present invention, a plurality of rotors are provided on at least one of the both side surfaces in the rotational axis direction of the rotor. According to a third aspect of the present invention, in the invention according to the first or second aspect, the magnet support portion includes a base portion provided in the housing, and a circumferential direction of the rotor from the base portion toward the stator magnet housing hole side. Formed by connecting the pair of support portions formed so as to extend to each other, the relief portion formed between the both support portions, and the respective tip portions of the both support portions, and connecting from the stator magnet housing hole side. By a force, a deformable plate portion that is elastically deformable in the escape portion,
The deformable plate portion is formed on the side of the stator magnet accommodating hole and includes an abutting portion that abuts a side surface of the stator magnet.

According to the invention described in claim 4, in addition to the function of the invention described in any one of claims 1 to 3, the magnet support portion is integrally formed with the housing. Therefore, according to the first aspect of the invention, when the stator magnet is accommodated in the stator magnet accommodating hole provided in the housing forming the stator, the stator magnet is provided on both side surfaces perpendicular to the circumferential direction of the rotor. At least one of the magnet support portions is elastically deformed. The stator magnet is supported in the circumferential direction of the rotor by the restoring force of elastic deformation of the magnet support portion. As a result, the stator magnet
It is easily accommodated in the stator magnet accommodating hole and fixed in the stator magnet accommodating hole regardless of the variation in the dimensions.

According to the second aspect of the present invention, the first aspect is provided.
In addition to the effect of the invention described in (1), since the stator magnet is supported in the circumferential direction at a plurality of positions in the rotation axis direction of the rotor,
The stator magnet is supported in a stable state.

According to the invention described in claim 3, according to claim 1 of the present invention,
Alternatively, in addition to the effect of the invention described in claim 2, when the stator magnet is housed in the stator magnet housing hole, the stator magnet comes into contact with the contact portion formed on the stator magnet housing hole side of the deformable plate portion. The deformable plate portion provided between the respective tip portions of the pair of support portions is deformed into the escape portion. Then, since the restoring force due to the elastic deformation is applied to the stator magnet from the deforming plate portion, the stator magnet is supported in the circumferential direction.

According to the invention described in claim 4, in addition to the operation of the invention described in any one of claims 1 to 3, the magnet support portion is formed together with the housing.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 2, the actuator 1 is composed of a stator 2 and a rotor 3. The stator 2 and the rotor 3 are housed in a case (not shown), in which the rotor 3 is positioned with respect to the stator 2 and is rotatably supported.

The stator 2 has a housing 4 made of synthetic resin such as nylon. A rotor accommodating hole 5 for accommodating the rotor 3 is formed in the center of the housing 4, and bobbin portions 7 for winding the exciting coil 6 are formed on both left and right sides of the rotor accommodating hole 5. .
An insertion hole 8 penetrating the rotor housing hole 5 is formed in each bobbin portion 7.
Are formed.

Stator magnet housing holes 9 are formed on both upper and lower sides of the housing 4, respectively. A stator magnet 10 and a spacer member (which forms a part of the magnetic path on the stator side) 11 are housed in each stator magnet housing hole 9.

An exciting pole 13 of a substantially E-shaped stator core 12 is inserted through the through hole 8 of each bobbin portion 7. Each yoke 14 of both stator cores 12 facing each other is
The respective tips are in contact with each other.

Therefore, the respective exciting magnetic poles 13 and the respective stator magnets 10 of the stator 2 are arranged at positions facing each other with respect to the rotor 3. Next, the stator magnet housing hole 9 will be described in detail.

3 and 4 show the stator magnet housing hole 9 in a state in which the stator magnet 10 is not housed. The left side positioning portion 15 is provided on the left side of the stator magnet housing hole 9.
Is formed, and the right side positioning portion 16 is formed on the right side thereof. An upper positioning portion 17 is formed on the upper side of the stator magnet housing hole 9 and a lower positioning portion 1 is formed on the lower side thereof.
8 are formed. Left positioning part 15, right positioning part 16, upper positioning part 17 and lower positioning part 18
By these, the stator magnet housing hole 9 is formed. The space between the upper positioning portion 17 and the lower positioning portion 18 of the stator magnet housing hole 9 is formed to be slightly larger than the length of the stator magnet 10 in the rotation axis direction.

The left side positioning portion 15 includes a base portion 20, support portions 21, 22, 23, relief portions 24, 25, a deforming plate portion 26,
27 and ridges 28 and 29. That is,
The base portion 20 of the left side positioning portion 15 has support portions 21 and 2 extending in the circumferential direction toward the stator magnet housing hole 9 side.
2, 23 are formed. An escape portion 24 is formed between the pair of support portions 21 and 22, and the pair of magnet portions 22 and 23 is formed.
An escape portion 25 is formed between them. Both support parts 21,
A deformable plate portion 26 that is elastically deformable in the escape portion 24 by the urging force from the side of the stator magnet housing hole 9 is provided between the tip portions of 22.
Are connected. Similarly, a deformable plate portion 27 that is elastically deformable is connected and formed in the escape portion 25 between the tip portions of both the support portions 22 and 23. A projecting strip 28 is formed on the side of the stator magnet accommodating hole 9 of the deforming plate portion 26.
Similarly, a ridge 29 is formed on 7.

Further, as shown in FIG. 4, in the housing 4, a slit is provided between the deforming plate portion 26 and the rotor accommodating hole 5 for supporting the deforming plate portion 26 only by the support portions 21 and 22. 30 is formed. Similarly, the deformation plate portion 2
Between the rotor 7 and the rotor housing hole 5, a slit 31 for supporting the deformable plate portion 27 only by the support portions 22 and 23 is formed.

Therefore, when the ridge 28 is biased from the side of the stator magnet accommodating hole 9 to the side of the relief portion 24, the deformable plate portion 26 elastically deforms toward the side of the relief portion 24 and the ridge 28 escapes. Two
Move to side 4. Then, the escape portion 24 from the ridge 28
A restoring force from the side of the arrow toward the side of the stator magnet accommodating hole 9 is applied to the side to be biased. Similarly, the stator magnet housing hole 9
When the ridge 29 is urged toward the escape portion 25 from the side, the deformable plate portion 27 elastically deforms toward the escape portion 25 and
Moves to the side of the escape portion 25. Then, a restoring force from the side of the escape portion 25 toward the side of the stator magnet housing hole 9 is applied to the side from which the ridge 29 is biased.

In the present embodiment, the base portion 20 and the support portion 2
The left and right side magnet support portions 32 are formed of the first and second 22, the relief portions 24, the deformation plate portions 26 and the ridges 28, and the base portion 20, the support portions 22, 23, the relief portions 25, the deformation plate portion 27 and the ridges 29.
At, a lower left magnet support portion 33 is formed.

The right side positioning portion 16 is formed in plane symmetry with respect to the left side positioning portion 15. That is, at the position facing the upper left magnet support 32 in the circumferential direction,
The right upper magnet support portion 34 is formed. Further, a lower right magnet support portion 35 is formed at a position facing the lower left magnet support portion 33 in the circumferential direction. Therefore, the configuration of each part of the upper right magnet support portion 34 is similar to that of the upper left magnet support portion 32.
In the following description, the same reference numerals are used for the configuration of each corresponding portion of the above, and the configuration of each portion of the lower right side magnet supporting portion 35 is the same as the configuration of the corresponding portion of the lower left side magnet supporting portion 33.

The circumferential distance k between the side surface of the left positioning portion 15 on the stator magnet housing hole 9 side and the side surface of the right positioning portion 16 on the stator magnet housing hole 9 side is the stator magnet 10
Is formed to be slightly larger than the circumferential width m (shown in FIG. 5). In addition, each of the ridges 28, 2 of the left side positioning portion 15
The distance n in the circumferential direction between 9 and each of the ridges 28 and 29 of the right side positioning portion 16 is smaller than the circumferential width m of the stator magnet 10. Therefore, the stator magnet housing hole 9
When the stator magnet 10 is assembled to the above, the protrusions 28 and 29 of the positioning portion 15 are biased to the left, and the protrusions 28 and 29 of the positioning portion 16 are biased to the right.

The magnet supporting portions 32, 33, 34, 35
Are integrally formed with the housing 4. Next, the operation of the stator magnet fixing structure in the actuator configured as described above will be described.

When the stator magnets 10 are not housed in the stator magnet housing holes 9 of the housing 4, as shown in FIG. 3, the deformable plate portions 26 and 2 of the magnet supporting portions 32 and 33 are provided.
7, and the deformation plate portions 26, 2 of the magnet support portions 34, 35
7 is not deformed.

When the stator magnet 10 is assembled in the stator magnet accommodating hole 9 in this state, the protrusions 28 and 29 are pressed by the stator magnet 10 in the magnet supporting portions 32 and 33 of the left side positioning portion 15, so that deformation occurs. The plate portions 26 and 27 elastically deform and move to the side of the escape portions 24 and 25. Further, in each magnet supporting portion 34, 35 of the right side positioning portion 16, each ridge 2
Since 8 and 29 are pressed by the stator magnet 10, the deformable plate portions 26 and 27 are elastically deformed and moved to the side of the escape portions 24 and 25. As a result, each protrusion 28 of the left side positioning portion 15,
Since the distance between 29 and each of the ridges 28, 29 of the right side positioning portion 16 increases, the stator magnet 10 is housed in the stator magnet housing hole 9 regardless of the variation in the width dimension m.

Then, the restoring force of the deforming plate portions 26 and 27 of the magnet supporting portions 32 and 33 acts on the stator magnet 10 to the right, so that the deforming plate portions 26 and 27 of the magnet supporting portions 34 and 35 act.
Restorative force acts to the left. As a result, the stator magnet 1
0 is supported in the stator magnet housing hole 9 in the circumferential direction.

At this time, the stator magnet 10 is connected to the rotor 3
The magnet support portions 32 and 33 and the magnet support portions 34 and 35 provided in the rotation axis direction of the are circumferentially supported at a plurality of positions in the rotation axis direction. As a result, the stator magnet 10
Are supported in a stable state.

When the rotor 3 of the assembled actuator 1 is driven, a varying magnetic field acts from the rotor magnet 3a of the rotor 3 to each stator magnet 10. At this time, since the stator magnet 10 is circumferentially supported by the magnet support portions 32, 33, 34, and 35 in the stator magnet housing hole 9, it does not move in the stator magnet housing hole 9.

As described in detail above, according to the stator magnet fixing structure in the actuator of the present embodiment,
The following effects can be obtained. (A) When the stator magnet 10 is assembled into the stator magnet housing hole 9, the deformable plate portions 26, 27 of the magnet support portions 32, 33, 34, 35 are elastically deformed. Then, the stator magnet 10 is supported in the circumferential direction of the rotor 3 by the restoring force of the respective deforming plate portions 26 and 27 while being assembled in the stator magnet housing hole 9. As a result, the suiter magnet 10
Is easily assembled in the stator magnet housing hole 9 regardless of the variation in the width m, and is fixed in the stator magnet housing hole 9. Therefore, the stator magnet 10 can be easily assembled, and furthermore, rattling after the assembly can be reliably prevented.

(B) Since the stator magnets 10 are circumferentially supported at a plurality of positions in the rotation axis direction by the magnet support portions 32, 33 (34, 35) provided in the rotation axis direction of the rotor 3. The stator magnet 10 is stably supported. Therefore, rattling after the stator magnet 10 is assembled can be prevented more reliably.

(C) A pair of support portions 21 and 22 formed on the base portion 20 with the magnet support portion 32, and both support portions 21 and 22.
And a deformable plate portion 26 that is formed by connecting the distal end portions of the support portions 21 and 22 and that is elastically deformed toward the escape portion 28 side by the stator magnet 10, and the deformed plate thereof. A ridge 28 provided on the portion 26 and abutting on the stator magnet 10
It consisted of and. Therefore, the stator magnet 10 has a simple structure.
Since it is possible to realize the magnet support portion 32 that supports the magnet, it is possible to suppress an increase in component cost.

(D) Stator magnet support portions 32, 33,
Since 34 and 35 are formed integrally with the housing 4, the stator magnet support portions 32, 33, 34 and 35 can be formed together with the housing 4. Therefore,
It is possible to prevent an increase in the number of parts.

(E) Each magnet supporting portion 32, 33, 34,
By the relief portions 28 and 29 provided in 35, each exciting coil 6
The heat generated in the case can be efficiently released to the case side. As a result, the temperature rise of the exciting coil 6 can be suppressed.

The present invention is not limited to the above embodiment, but may be configured as follows. (1) Although it is implemented in the swing-type actuator 1, it may be implemented in a DC device having the stator magnet 10 on the stator side. Also in this case, the stator magnet 10 can be easily assembled, and rattling after the assembly can be prevented.

(2) As shown in FIG. 6, the magnet supporting portions 32, 33, 36 (34, 3) are attached to the respective positioning portions 15, 16.
5, 37) may be provided so as to face each other in the circumferential direction. Further, the number may be one, or four or more may be provided.

(3) The magnet supporting portions 32 to 35 provided on the respective positioning portions 15 and 16 may be arranged at positions that do not face each other in the circumferential direction. Even in this case, the stator magnet 10 can be easily assembled, and rattling after the assembly can be prevented.

(4) The magnet supporting portions 32 to 35 may be provided only on one of the left and right sides of the stator magnet housing hole 9. At this time, the number of the magnet supporting portions 32 to 35 may be any number. With this configuration as well, the stator magnet 1
0 can be easily assembled and rattling after assembly can be prevented.

(5) The numbers of the magnet supporting portions 32 to 35 may be different on the left and right sides. (6) The shape of the deformable plate portions 26, 27 is not limited to the same thickness plate shape, and may be a shape in which the thickness changes near the support portions 21, 22, 23 and far.

(7) The cross-sectional shape of the ridges 28, 29 is not limited to a semi-circular shape, but may be, for example, a triangular shape. (8) Instead of providing the protrusions 28 and 29, the deformable plate portion 2
The central portions of 6, 27 may be formed in a shape that bulges toward the magnet housing hole 9 side, and this portion may serve as the contact portion.

(9) Although each of the magnet support portions 32 to 35 is formed integrally with the housing 4, it may be formed separately from the housing body and assembled to the housing body. According to this configuration, the deformable plate portion 2
Since the elastic coefficients of 6 and 27 can be selected more appropriately, the rattling of the stator magnet 10 can be prevented more reliably.

The technical ideas other than the claims that can be understood from the above-described embodiment will be described below along with their effects. (1) In the stator magnet fixing structure in the actuator according to the first aspect, the actuator is a swing type actuator.

With this structure, it is possible to increase the accuracy of positioning the rotor at a predetermined angular position.

[0048]

As described above in detail, according to the invention described in claim 1, it can be easily assembled, and
It is possible to reliably prevent rattling after assembling.

According to the invention of claim 2, claim 1
In addition to the effect of the invention described in (1), rattling after assembling can be prevented more reliably. According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, since it can be implemented with a simple configuration, it is possible to prevent an increase in component cost.

According to the invention of claim 4, claim 1
In addition to the effect of the invention described in any one of claims 3 to 3, an increase in the number of parts can be prevented.

[Brief description of drawings]

FIG. 1 is a front view of an actuator.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view of a stator magnet housing hole.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a front view of a stator magnet housing hole that houses a stator magnet.

FIG. 6 is a front view showing an actuator of another example.

FIG. 7 is a plan sectional view of a housing and a rotor of an actuator of a conventional example.

FIG. 8 is a front view of the housing.

[Explanation of symbols]

2 ... Stator, 3 ... Rotor, 4 ... Housing, 5 ... Rotor housing hole, 9 ... Stator magnet housing hole, 10 ... Stator magnet, 20 ... Base part, 21, 22, 23 ... Support part, 24, 2
5 ... Escape part, 26, 27 ... Deformation plate part, 28, 29 ... Ridge as contact part, 32, 33, 34, 35 ... Magnet support part.

Claims (4)

[Claims] 1. A stator magnet housing hole is provided in a housing that constitutes a stator so as to face a rotor housing hole that houses a rotor, and the stator magnet is housed inside the stator magnet housing hole. In a stator magnet fixing structure for an actuator that is fixed at a position facing each other, in the inside of the stator magnet accommodating hole, at least one of both side surfaces perpendicular to the circumferential direction of the rotor is provided, and the stator magnet is provided with the stator magnet. A structure for fixing a stator magnet in an actuator, which is provided with a magnet support portion that elastically deforms by being housed in a housing hole and that supports the stator magnet in the circumferential direction of the rotor by the restoring force of the elastic deformation. 2. The stator magnet fixing structure for an actuator according to claim 1, wherein a plurality of magnet supporting portions are provided on at least one of the both side surfaces in a rotation axis direction of the rotor. 3. The magnet support portion includes a base portion provided in the housing, a pair of support portions formed so as to extend in a circumferential direction of the rotor from the base portion toward the stator magnet housing hole side, and both support portions. An escape portion formed between the support portions, and a deformable plate portion formed by connecting the respective tip portions of the support portions, and elastically deformable in the escape portion by an urging force from the side of the stator magnet housing hole, The stator magnet fixing structure for an actuator according to claim 1 or 2, further comprising: an abutting portion which is formed on a side of the stator magnet accommodating hole of the deformable plate portion and abuts a side surface of the stator magnet. 4. The stator magnet fixing structure for an actuator according to claim 1, wherein the magnet support portion is formed integrally with the housing.