JPH1189128A - Stator of electric motor and method of manufacturing the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a stator of an electric motor in which a coil bobbin around which a coil is wound and a magnetic pole tooth attached and fixed are fitted to an annular stator core, and a method of manufacturing the same. The present invention relates to a motor stator assembled by connecting coil bobbins and a method of manufacturing the stator. SOLUTION: A predetermined number of coil bobbins 23 are connected to a connection part 32.
To form a coil bobbin body 20 and apply a winding 22 to each coil bobbin 23, and then coil bobbin body 2
The stator 24 is assembled by forming an annular shape 0 and fitting and fixing the same to the stator core 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for an electric motor, in which a coil bobbin formed by connecting a plurality of winding frames around which coils are wound and magnetic pole teeth are mounted and fixed to an annular yoke core. More particularly, the present invention relates to a stator for an electric motor in which a coil bobbin is divided and manufactured, and the coil bobbin is connected and assembled, and a method for manufacturing the same.

[0002]

2. Description of the Related Art As a stator (stator) of an electric motor using a coil bobbin, there is a type described in Japanese Patent Application Laid-Open No. 7-245895. That is, if it explains based on FIG.10 and FIG.11, the stator (stator) 8
Is composed of a stator core 1, a coil 4, and a coil bobbin 5 made of resin, and a rotor (rotor) 10 is inserted into a stator 8 and rotatably supported. A plurality of coil bobbins 5 are continuously and integrally formed in a strip shape at equal intervals by a thin portion 15a. The material of the coil bobbin 5 is only required to be insulating and need not necessarily be made of resin.

In the method of manufacturing the stator 8, first, the magnetic pole teeth 2 are mounted on each coil bobbin 5. Magnetic pole teeth 2
Has a columnar shape, but has a rotor-facing portion 2a formed on one end side and extending in a half-moon shape. In other words, the thin portion 15a is bent so that the coil bobbin 5 is opposed to the rotor 10 so that the rotor facing portion 2a of the magnetic pole tooth 2 is located outside, and the magnetic pole tooth 2 is opposed to the normal assembled state while being rounded in an annular manner. If the coil bobbin 5 is not fixed on the inner diameter side but connected on the outer diameter side if the 2a is positioned and fixed so as to be at a predetermined position of the winding material (not shown), the magnetic pole teeth 2 can be widely opened. Can be done.

In this state, a predetermined magnetic pole tooth 2 is positioned on a reference line for winding, and the winding is wound around a coil bobbin 5 by a winding machine. Then, after winding all the coil bobbins 5, the stator is manufactured by assembling the stator core 1 based on a regular assembling state.

[0005]

In the above-described method of manufacturing a stator for an electric motor, a plurality of coil bobbins are integrally formed as a coil bobbin body which is continuously formed in a strip shape at equal intervals by a thin portion. In order to manufacture a coil bobbin, a large mold is required, and the productivity is extremely poor.

Also, structurally, when the coil bobbin is formed in an annular shape, deformation such as displacement or distortion is apt to occur, and it is necessary to assemble the coil bobbin while holding the coil bobbin and the magnetic pole teeth with a jig. Furthermore, to ensure insulation between the coils,
It is necessary to secure a certain space distance, and it becomes difficult to wind the coil in a high space.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for manufacturing a coil bobbin which does not require a large molding die and has good manufacturability.

Further, when the coil bobbin is formed in an annular shape, the slot is closed by the adjacent rotor facing portion so as not to cause a deformation such as displacement or distortion, so that a motor stator having good assemblability can be provided. To provide.

It is another object of the present invention to provide a motor stator in which the distance between the insulating spaces is reduced by providing a partition plate for insulating adjacent coils.

[0010]

According to the present invention, there is provided a coil bobbin body comprising a coil and a coil bobbin around which the coil is wound and having a connection portion, the connection portion allowing the coil bobbin to be rotatably connected to another coil bobbin. A magnetic pole tooth mounted and fixed to the coil bobbin, and a fixed iron core that fits and holds a plurality of annularly formed coil bobbin bodies with the magnetic pole teeth mounted and fixed by the connection portion. It is the stator of the electric motor.

According to the present invention, the connecting portion is formed in a structure in which the concave portion and the convex portion are rotatably fitted.

According to the present invention, the connecting portion is formed by an insertion pin and an insertion hole.

Further, according to the present invention, there is provided a stator for an electric motor, wherein the magnetic pole teeth and the coil bobbin are integrally formed.

According to the invention, the coil bobbin is divided into two parts symmetrically in the vertical direction with respect to the axial direction of the rotor of the motor.

Further, according to the present invention, there is provided a stator for an electric motor, wherein the coil bobbin is provided with a projection for holding a crossover between in-phase coils and a terminal connection portion of the coil.

According to the present invention, there is provided a stator for an electric motor, wherein a flange portion for closing a slot between adjacent coil bobbins is formed on the coil bobbin when the coil bobbin is formed in an annular shape.

[0017] A stator for an electric motor, wherein an insulating partition plate is provided between the coil bobbins to connect a connection portion of an adjacent coil bobbin.

According to the present invention, there is provided a stator for an electric motor, wherein at least one of the coil bobbin and the partition plate is formed of an electrically insulating material having high magnetic permeability.

According to the present invention, in a method for manufacturing a stator for an electric motor, a coil bobbin around which a coil is wound and a magnetic pole tooth mounted and fixed are fitted to an annular stator core. A method of manufacturing a stator for an electric motor, comprising: a step of connecting a plurality of connecting portions in a strip shape; and a step of winding a winding around the coil bobbin.

According to the present invention, in a method of manufacturing a stator for an electric motor, a coil bobbin on which a coil is wound and a magnetic pole tooth mounted and fixed are fitted to an annular yoke core, the coil bobbin is fixed. A method for manufacturing a stator for an electric motor, comprising: a step of winding a winding around a child, a step of connecting the coil bobbin by a connecting portion, and a step of connecting a winding having the same phase.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

Referring to FIGS. 1 to 8, as shown in FIGS. 1 and 2, an electric motor is generally assembled with a stator and a rotor, as is well known. The stator includes a coil bibin body 20 formed by connecting a plurality of coil bobbins 23 with a stator iron core 29 formed by laminating a plurality of electromagnetic steel sheets punched by a press or the like, and magnetic pole teeth 26 mounted on each coil bobbin 23. It is composed of A concave portion 28 for fitting and fixing the magnetic pole teeth 26 is formed inside the ring-shaped fixed iron core 29. The magnetic pole teeth 26 are formed so as to form a gap 34 between the adjacent rotor facing portions 26a while being fitted and fixed in the concave portions 28. Of course, the internal dimensions of the stator core 29 are designed to accommodate the coil bobbin 23 formed in an annular shape, while the flange portion 30 provided on the side of the coil bobbin 23 facing the rotor is in contact with the adjacent flange portion 30. Designed for

FIG. 3 shows the structure of each coil bobbin body 20 mounted on the magnetic pole teeth 26. The coil bobbin 23 has a single coil bobbin 23 around which the coil 22 is wound.
Alternatively, a plurality of coil bobbins 23 connected by a bendable thin portion 23a as shown in FIG.
Are connected by a predetermined number to form a band. Further, as shown in FIG. 5A, the connecting portion 32 is a coil bobbin 2 having a connecting portion 32a having a concave section at one end and a connecting portion 32b having a convex portion at the other end.
3 are rotatably fitted to each other. FIG.
As shown in (b), a structure can be used in which the engagement pin 33 and the pin hole 34 are used as hinges and rotatably connected. This structural coil bobbin 23 can be arbitrarily communicated. Further, the number of coil bobbins 23 connected by the thin portions 23a can be arbitrarily selected (this can be any number less than the number of the magnetic pole teeth 26, but in consideration of manufacturability, the size of a molding die, etc.). , Around 2 to 4).

The coil bobbin body 20 can be formed by a combination of a single coil bobbin 23 and a plurality of integrated coil bobbins 23.

Further, as shown in FIG.
3 can be divided and manufactured like an upper bobbin 23b and a lower bobbin 23c (with respect to the axial direction of the rotor of the electric motor). Of course, at the time of winding, winding is performed after combining these.

In this embodiment, the coil bobbin 2
Although the coil 22 is wound after the magnetic pole teeth 26 are attached to the coil 3, the coil 22 can be wound at any time after the coil 22 is wound or before the magnetic pole teeth 26 are fitted and fixed to the stator core 29. is there.

The situation in which the coil 22 is wound around the coil bobbin 23 will be described with reference to FIGS. 7 (a) and 7 (b).
The coil bobbin body 20 is bent in a straight line or in a direction opposite to the direction at the time of assembling, and the slot
Coil 22 inside slot 27 by widening
For easy winding. In this state, the magnetic pole teeth 26 are arranged at equal intervals, and the coils 22 of the same phase are continuously concentrated around the magnetic pole teeth 26 via the connecting wires 36. On the stator core 29 side of the coil bobbin 23, there are provided a projection 37 for holding the crossover 36 and a terminal 38 and a connector for connecting the terminal of the coil 22, so that after winding the coil 22, the coil bobbin 23 As shown in FIG. 7 (b), it is rounded and inserted into the stator core 29.
At this time, both ends of the coil bobbin body 20 are connected and fixed by a connecting portion 39 provided in advance.

When the coil 27 is wound around the slot 27, the slot 27 is also closed by the adjacent coil bobbin 23, the thin portion 23a and the flange portion 30 when it is rolled into an annular shape. Or it is equivalent to a half-open magnetic path). As a result, the coil bobbin 23 is connected and fixed on the inner diameter side and the outer diameter side, so that deformation such as distortion hardly occurs, and the coil bobbin 23 is easily inserted into the stator core 29.

Further, as shown in FIG. 8, by providing a partition plate 40 for insulating between the coils 22 between the coil bobbins 23 also as a connecting portion, it is necessary to take a space distance for ensuring insulation between the coils 22. As a result, the coil 22 can be further wound, and the space factor can be improved.

Further, the material of the coil bobbin 23 is not limited to resin, and any material having a high insulating property can be used. An insulating material having a high magnetic permeability (for example, a plastic magnet or a resin mixed with iron oxide, etc.) To coil bobbin 2
The partition plate 40 can be used as an auxiliary salient pole of the stator 24 by using the whole 3 or the partition plate 40, and the torque ripple and cogging torque can be reduced.

After the coil 22 is wound around the coil bobbin 23, the coil 22 can be connected to the coil bobbin 23 in a belt shape. That is, as shown in FIG. 9, the coil 22 can be wound after the magnetic pole teeth 26 are mounted on the coil bobbin 23. In this case, it is preferable to provide the coil bobbin 23 with a terminal 38 for connecting (fixing) the start and end of the winding of the coil 22 so that the connection between the coils 22 can be easily performed. After the coil bobbin 23 is connected in a belt shape, the coil bobbin body 20 is rounded into a ring shape and the outside of the magnetic pole teeth 26 is fitted and fixed to the concave portion 28 in the stator core 29 in the same manner as in the above-described embodiment.

Further, it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0033]

According to the present invention, a predetermined number of coil bobbins are connected as needed to assemble the coil bobbin body, so that a large die required for integrally forming the coil bobbin body as in the prior art. Can be manufactured with a small molding die, and even if a yield failure occurs, it can be partially replaced.

Further, according to the present invention, since the connection portion of the coil bobbin is made rotatable, it is possible to widen the interval between adjacent coil bobbins and to set the state thereof arbitrarily when winding the coil around the coil bobbin. Therefore, the winding of the coil becomes extremely easy, and the space factor of the coil can be increased.

Further, according to the present invention, since the coil bobbin and the magnetic pole teeth are integrally formed, the assembling is facilitated and the assembling accuracy can be improved.

Further, according to the present invention, since the coil bobbin is divided into two vertically symmetrically with respect to the axial direction of the electric motor, the molding die can be reduced in size.

Further, according to the present invention, the protrusion for holding the crossover of the in-phase coil and the terminal connection portion of the coil are provided on the stator core, so that the stator assemblability can be improved.

Further, according to the present invention, since the coil bobbin is provided with the flange portion, the slot can be closed by the flange portion of the adjacent coil bobbin when the coil bobbin body is formed in a ring shape, so that the assemblability of the stator is greatly improved. .

Further, according to the present invention, since a partition plate is provided between the coil bobbins to insulate the coils from each other, the insulating space can be reduced, and it can be used as an auxiliary salient pole of the stator.

Further, according to the present invention, the winding is wound by connecting the coil bobbins in a predetermined number of bands in the method for manufacturing the stator of the electric motor, so that the winding of the coil is extremely easy and the processing of the crossover is facilitated. As a result, the space factor of the coil can be increased, and the manufacturing cost of the stator and the electric motor can be reduced.

Further, according to the present invention, since the coil bobbin is connected with the winding wound in the method for manufacturing the stator of the electric motor, the stator of the electric motor can be easily assembled.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a stator of an electric motor according to an embodiment of the present invention.

FIG. 2 is a model diagram of a main part of a stator of the electric motor according to the embodiment of the present invention.

FIG. 3 is a side view in which a coil bobbin and the like of the present invention are connected.

FIG. 4 is a side view of the coil bobbin of the present invention.

FIG. 5 is a perspective view showing a connection portion.

FIG. 6 is a perspective view in which a coil bobbin is divided into two parts.

FIG. 7A is a side view in which coil bobbins are connected to form a crossover, and FIG. 7B is a plan view in which coil bobbins are connected in a ring shape.

FIG. 8A is a side view of a coil bobbin connected to a partition plate, and FIG. 8B is a plan view and a side view of the partition plate.

FIG. 9 is a side view illustrating an embodiment in which a coil is wound around a coil bobbin and then connected in a belt shape as a coil bobbin for assembly.

FIG. 10 is a plan view of a stator of a conventional electric motor.

11 (a) and 11 (b) are views for explaining mounting of conventional coil bobbin tight magnetic pole teeth, in which (a) is a side view showing a state before both are mounted, and (b) is a side view showing a state where both are mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Coil bobbin body 22 ... Coil 23 ... Coil bobbin 24 ... Stator (stator) 25 ... Rotor (rotor) 26 ... Magnetic pole teeth (Magnetic pole teeth) 27 ... Slot 28 ... Concave part 29 ... Stator iron core 23a ... Thin section 32 ... Connection Part 33: Engagement pin 34: Pin hole 36: Crossover 37: Projection 38: Terminal 39: Connection part 40: Partition plate

Claims (11)

[Claims] 1. A coil, a coil bobbin body wound around the coil and having a connection portion, the coil bobbin body being rotatably connectable to another coil bobbin by the connection portion, and a magnetic pole mounted and fixed to the coil bobbin. A stator for an electric motor, comprising: a tooth; and a fixed iron core that fits and holds a plurality of coil bobbin bodies to which the magnetic pole teeth are mounted and fixed by the connecting portion. 2. The stator for an electric motor according to claim 1, wherein the connecting portion is formed in a structure in which the concave portion and the convex portion are rotatably fitted. 3. The stator for an electric motor according to claim 1, wherein the connection portion is formed by an insertion pin and an insertion hole. 4. The stator according to claim 1, wherein the magnetic pole teeth and the coil bobbin are integrally formed. 5. The electric motor stator according to claim 1, wherein the coil bobbin is divided into two vertically symmetrically with respect to the axial direction of the rotor of the electric motor. 6. The stator for an electric motor according to claim 1, wherein the coil bobbin is provided with a protrusion for holding a crossover between the in-phase coils and a terminal connection portion of the coil. 7. The stator according to claim 1, wherein when the coil bobbin is formed in an annular shape, a flange portion for closing a slot between adjacent coil bobbins is formed on the coil bobbin. 8. The stator for an electric motor according to claim 1, wherein an insulating partition plate is provided between the coil bobbins to connect a connection portion of an adjacent coil bobbin. 9. The stator according to claim 1, wherein at least one of the coil bobbin and the partition plate is formed of an electrically insulating material having high magnetic permeability. 10. A method for manufacturing a stator of an electric motor, comprising a coil bobbin around which a coil is wound and a magnetic pole tooth mounted and fixed to an annular stator core, wherein a predetermined number of said coil bobbins are connected by connecting portions. A method for manufacturing a stator for an electric motor, comprising: a step of connecting in a belt shape; and a step of winding a winding around the coil bobbin. 11. A method for manufacturing a stator for an electric motor, comprising a coil bobbin around which a coil is wound and a magnetic pole tooth attached and fixed to an annular yoke core, wherein the coil bobbin has a winding wound around the stator. A method for manufacturing a stator for an electric motor, comprising: a step of winding, a step of connecting the coil bobbin by a connecting portion, and a step of connecting windings having the same phase.