JPH10234145A - Stator of inner rotor type motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain resin burrs from being generated and increase the degree of design freedom in the shape of a coil winding part and in the design of a magnetic circuit structure. SOLUTION: A stator 11 is constituted of a coil retainer 17, a stator coil 18, and an iron ring-shaped member 19. The coil retainer 17 involves a magnetic pole part 20 and a connecting part 21 for connecting it. The magnetic pole part 20 is made of a magnetic plastic, and the connecting part 21 is made of a non-magnetic plastic, which are formed integrally with each other. Around the connecting part 21 of the coil retainer 17, a coil-winding part 22 consisting of grooves is formed. A stator coil 26 is wound around the coil winding part 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stator for an inner rotor type motor.

[0002]

As a stator of an inner rotor type motor, one having a configuration disclosed in Japanese Patent Application Laid-Open No. 5-336686 is known. That is, FIG.
As shown in (1), the inner peripheral side of the core (iron core) 1 is connected by an inner annular body 2 made of non-magnetic plastic, and the outer peripheral side of the core 1 is connected by an annular body 3 made of magnetic plastic. In this case, the core 1 and the annular body 2 made of non-magnetic plastic are outsert molded by a molding die.

However, in this method, when the core 1 is outsert molded from a non-magnetic plastic, the mold clamping of the molding die becomes uneven due to the variation of the material and the processing accuracy of the core 1, and the core 1 and the plastic material become non-uniform. Burrs may occur at the boundary between the two. In addition, since the core 1 is made of a laminated steel plate, the shape of the portion where the coil is wound in the core 1 is restricted, and the degree of freedom in designing the magnetic path structure is also restricted.

The present invention has been made in view of the above circumstances, and an object thereof is to reduce the occurrence of resin burrs and increase the degree of freedom in designing the shape of a coil winding portion and a magnetic path structure. An object of the present invention is to provide a stator of an inner rotor type motor.

[0005]

According to a first aspect of the present invention, there is provided a coil holder having a magnetic pole portion made of a magnetic plastic and a connecting portion made of a non-magnetic plastic for mutually connecting the magnetic pole portions. Be prepared. In this configuration, the magnetic pole portion is made of magnetic plastic, the connecting portion is made of non-magnetic plastic, and the magnetic pole portion and the connecting portion are integrally formed to form a coil holding body. Unlike the one that outserts the body, no burrs are generated, and the degree of freedom in designing the shape of the coil winding portion and the magnetic path structure is increased.

According to a second aspect of the present invention, a magnetic plastic magnetic pole portion and a non-magnetic plastic connecting portion for connecting the magnetic pole portions to each other with the rotor-side end surfaces of the magnetic pole portions exposed are integrally formed. And a coil holding body. In this configuration, burrs do not occur,
In addition, the degree of freedom in designing the shape of the coil winding portion and the magnetic path structure is increased. Further, since the end face of each magnetic pole portion on the rotor side is exposed, the magnetic resistance between the magnetic pole and the rotor is reduced. In other words, in a configuration in which the magnetic pole portion is formed of a core and the inner peripheral side of the core is connected with a plastic material, the magnetic pole portion is connected to the rotor on the inner peripheral side of the stator in order to secure the core holding strength or depending on the processing accuracy of the core. In consideration of the fact that the gap becomes uneven, the end face of the core on the rotor side is also covered with a plastic material. However, this increases the magnetic resistance between the rotor and the rotor. In this regard, the above-described configuration does not cause such a problem.

According to a third aspect of the present invention, there is provided a magnetic pole portion made of a magnetic plastic, and a connecting portion made of a non-magnetic plastic for connecting the magnetic pole portions with each other in such a manner that the end face of the magnetic pole portion on the rotor side is exposed and covers the periphery. It is characterized by having a coil holder which is integrally formed, and a coil winding portion which can be wound with a stator coil from the outer peripheral side at a connection portion of the coil holder. In this configuration, burrs are not generated, the degree of freedom in designing the shape of the coil winding portion and the magnetic path structure is increased, and the magnetic resistance between the coil and the rotor is reduced. In addition, since the connecting portion is formed with a coil winding portion from which the stator coil can be wound from the outer peripheral side, the stator coil can be wound around the coil winding portion from the outside, and the winding can be performed. Workability is improved.

According to a fourth aspect of the present invention, a plurality of magnetic plastic magnetic pole portions serving also as a coil winding portion around which a stator coil is wound, and the end faces of the magnetic pole portions on the rotor side are exposed. And a connecting portion made of a non-magnetic plastic for mutually connecting the coil holding members at the inner peripheral portion thereof. In this configuration, burrs are not generated, the degree of freedom in designing the shape of the coil winding portion and the magnetic path structure is increased, and the magnetic resistance between the coil and the rotor is reduced. Moreover, since the connecting portion is configured to be connected only to the inner peripheral portion of the magnetic pole portion, the outer peripheral side of the magnetic pole portion is open, and therefore, the stator coil is connected to the magnetic pole portion from the outer peripheral side. Winding is possible, and winding workability is improved. Further, since the connecting portion is configured to connect the magnetic pole portion to each other only at the inner peripheral portion, the amount of material used for the connecting portion can be reduced.

The invention according to claim 5 is characterized in that the outer peripheral side of the magnetic pole portion in the coil holder is connected to a ring-shaped member made of a magnetic material. In this configuration, the magnetic circuit characteristics are improved, and the strength of the coil holder is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, a rotor 13 is rotatably provided inside a stator 11 via bearings 12, 12. This rotor 13
Attaches the rotor yoke 15 to the rotating shaft 14,
A permanent magnet 16 is attached to the rotor yoke 15. The stator 11 includes a coil holder 17, a stator coil 18, and a ring-shaped member 19. The coil holder 17 includes, for example, three magnetic pole portions 2.
0 and a connecting portion 21. The magnetic pole part 20
It is obtained by kneading pure iron powder in a weight ratio of 70 to 95% and polyamide isotropic linear structure plastic in the remaining weight ratio, followed by injection molding. The connecting portion 21 is made of non-magnetic plastic, and accommodates the magnetic pole portion 20 in a molding die.
It is formed by filling and solidifying one material (non-magnetic plastic) in a molten state, that is, the coil holder 17 is integrally formed by two-color molding. The connecting portion 21 connects the magnetic pole portions 20 to each other such that the end face on the rotor 13 side and the end face on the opposite side are exposed and surround the periphery.

Further, a coil winding portion 22 formed of a groove is formed around the connecting portion 21 of the coil holding body 17. Further, mounting flanges 23 are formed at three places in the upper part of the connecting part 21, and bearings 12, 1 are provided above and below the inner peripheral part.
Two housing portions 24, 24 are formed. Further, terminals 25 are implanted on the upper and lower surfaces. Further, the stator coil 18 is wound around the coil winding portion 22,
The winding start portion or the winding end portion is wound around the terminal 25. Further, the ring-shaped member 19 is fitted and fixed to the outer peripheral surface of the coil holder 17, and the ring-shaped member 19 is made of a magnetic material such as iron. This ring-shaped member 19 is fitted after winding the stator coil 18.
Further, the motor having such a configuration is, for example, a printed circuit board 26.
Is attached to the mounting flange 23 by screwing.

According to this embodiment, the magnetic pole portion 20
Is made of magnetic plastic, the connecting portion 21 is made of non-magnetic plastic, and the magnetic pole portion 20 and the connecting portion 21 are integrally formed to form the coil holder 17, so that the core and the plastic ring are separated from each other. Unlike the outsert molding, no burrs are generated, and the degree of freedom in designing the shape of the coil winding portion 22 and the magnetic path structure is increased.

Further, since the end face of each magnetic pole section 20 on the rotor 13 side is exposed, the magnetic resistance between the magnetic pole section 20 and the rotor 13 is reduced. In other words, in a configuration in which the magnetic pole portion is formed of a core and the inner peripheral side of the core is connected with a plastic material, the magnetic pole portion is connected to the rotor on the inner peripheral side of the stator in order to secure the core holding strength or depending on the processing accuracy of the core. In consideration of the fact that the gap becomes uneven, the end face of the core on the rotor side is also covered with a plastic material. However, this increases the magnetic resistance between the rotor and the rotor. In this respect, this is not the case in this embodiment.

Further, according to the present embodiment, the connecting portion 21 is formed with the coil winding portion 22 from which the stator coil 18 can be wound from the outer peripheral side. The winding workability can be improved because the winding work can be wound around the outer surface of the work piece 22. That is, in general, the stator of the inner rotor type motor has a slot which is opened on the inner peripheral surface side. In this case, the coil winding work on the slot does not take much space, and the workability is poor. Things. However, in the present embodiment, the coil winding portion 22 is formed so as to be opened on the side opposite to the rotor of the connecting portion 21, so that the stator coil 18 can be wound from the outer peripheral side of the connecting portion 21. Because
The winding work of the stator coil 18 can be performed in a wide space, and the workability is improved. Further, according to the present embodiment, since the outer peripheral side of the magnetic pole portion 20 in the coil holder 17 is connected to the ring-shaped member 19 made of a magnetic material, the magnetic circuit characteristics are improved and the strength of the coil holder is improved. Is improved.

FIG. 5 shows a second embodiment of the present invention. In this embodiment, a portion 31a of the magnetic pole portion 31 on the side opposite to the rotor can be fitted to the inner surface of the ring-shaped member 19. It is formed in a shape, and a mounting flange 32 is formed above the portion 31a. Further, the coil winding portion 33 formed of a groove is formed by connecting the connecting portion 34 and the portion 31 a of the magnetic pole portion 31.
Is formed by the gap between the two. In the second embodiment, the same effects as in the first embodiment can be obtained.

FIGS. 6 to 8 show a third embodiment of the present invention, which differs from the first embodiment in the following points. That is, in the stator 41, the coil holder 44 having the stator coil 43 is fitted to the inner peripheral surface of the ring member 42, and the bearing end plates 45 and 46 are fitted to the upper and lower portions of the ring member 42. Do it. Note that a mounting flange portion 47 is formed on the upper bearing end plate 45.

The coil holder 44 has four magnetic plastic magnetic pole portions 48 and a non-magnetic plastic connecting portion 49, and the magnetic pole portion 48 is formed on the inner peripheral portion 4.
8a and the outer peripheral side portion 48b project in an arc shape when viewed in plan, so that the coil winding portion 50 around which the stator coil 43 is wound is also used. Connecting part 49
Has an arc shape, and the magnetic pole portion 48 is
And are integrally formed with the magnetic pole portion 48 so as to be connected to each other. In this case, the end face of the magnetic pole portion 48 on the rotor 13 side is exposed. Further, the ring-shaped member 42 is made of a magnetic material, and a concave portion 42a is formed on the inner surface of the ring-shaped member 42 so as to fit with the outer peripheral portion 48b of the magnetic pole portion 48 of the coil holder 44. In this embodiment, since the connecting portion 49 connects the magnetic pole portion 48 to each other at the inner peripheral portion 48a, the stator coil 43 can be wound around the magnetic pole portion 48 from the outer peripheral side. It is possible, and the winding workability is improved, and the amount of material used for the connecting portion 49 can be reduced.

[0018]

As apparent from the above description, the present invention has the following effects. According to the first aspect of the present invention, the magnetic pole portion is made of magnetic plastic, the connecting portion is made of non-magnetic plastic, and the magnetic pole portion and the connecting portion are integrally formed to constitute the coil holder. Unlike the one that outserts a plastic ring, no burr is generated, and the degree of freedom in designing the shape of the coil winding portion and the magnetic path structure is increased.

According to the second aspect of the present invention, since the end face of each magnetic pole portion on the rotor side is exposed, the magnetic resistance between the magnetic pole and the rotor can be reduced. According to the third aspect of the present invention, since the connecting portion is formed with the coil winding portion capable of winding the stator coil from the outer peripheral side, the stator coil is wound around the coil winding portion from the outside. And the winding workability is improved.

According to the fourth aspect of the present invention, since the connecting portions are connected to each other at the inner peripheral portion of the magnetic pole portion, the stator coil can be wound around the magnetic pole portion from the outer peripheral side. It is possible to improve the winding workability and to reduce the amount of material used for the connecting portion. According to the invention of claim 5, the magnetic circuit characteristics are improved, and the strength of the coil holder is improved.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and is a longitudinal sectional view taken along line KK of FIG. 2;

FIG. 2 is a plan view of the entire motor.

FIG. 3 is a longitudinal sectional view taken along line LL of FIG. 4;

FIG. 4 is a plan view of a stator.

FIG. 5 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional side view of an entire motor showing a third embodiment of the present invention.

FIG. 7 is a cross-sectional plan view.

FIG. 8 is a cutaway perspective view.

FIG. 9 is a plan view of a stator showing a conventional example.

[Explanation of symbols]

11 is a stator, 13 is a rotor, 15 is a rotor yoke,
Reference numeral 16 denotes a permanent magnet, 17 denotes a coil holder, 18 denotes a stator coil, 19 denotes a ring-shaped member, 20 denotes a magnetic pole portion, 21 denotes a connecting portion, 22 denotes a coil winding portion, 31 denotes a magnetic pole portion, and 33 denotes a coil winding portion. , 34 are connecting parts, 41 is a stator, 42 is a ring-shaped member, 43 is a stator coil, 44 is a coil holder, 48 is a magnetic pole part, 49 is a connecting part, and 50 is a coil winding part.

Claims (5)

[Claims] An inner rotor type motor comprising: a coil holder formed integrally with a magnetic plastic magnetic pole portion and a non-magnetic plastic connecting portion for connecting the magnetic pole portions to each other. Stator. 2. A coil holding device comprising a magnetic plastic magnetic pole portion and a non-magnetic plastic connecting portion for connecting the magnetic pole portions to each other with the rotor-side end surfaces of the magnetic pole portions exposed. A stator for an inner rotor type motor comprising a body. 3. A magnetic pole portion made of a magnetic plastic and a connecting portion made of a non-magnetic plastic for connecting the magnetic pole portions to each other in such a manner that an end face of the magnetic pole portion on the rotor side is exposed and covers the periphery. A stator for an inner rotor type motor, comprising: a coil holder; and a connecting part of the coil holder having a coil winding part capable of winding a stator coil from an outer peripheral side thereof. 4. A plurality of magnetic plastic magnetic pole portions serving also as coil winding portions around which a stator coil is wound, and the end portions of the respective magnetic pole portions on the rotor side are exposed so that the magnetic pole portions are formed on the inner circumferential side thereof. A coil holder which is integrally formed with a non-magnetic plastic connecting portion which is connected to each other at a portion of the stator of the inner rotor type motor. 5. The inner rotor type motor according to claim 1, wherein an outer peripheral side of the magnetic pole portion of the coil holding body is connected to a ring-shaped member made of a magnetic material. Stator.