JPH11308789A - Stator of electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce magnetic resistance by improving the structure for fixing a coil to a stator core so that a cross-sectional area of a magnetic pole section of the stator core may become larger. SOLUTION: A stator core S1 is made by stacking a plurality of silicon steel plates S4a, S4b, having the same transverse cross-sectional shape as the stator core in the axial direction and jointing them into an integral body. Finger- like sections formed on both sides in the circumferential direction at the end of a magnetic pole section S4al of the silicon steel plate S4a which are located on both ends in the axial direction of the stator core S1 are bent toward the side S3u1 of a coil S3u1 to be formed into coil stopping sections S4a3, after the coil S3u1 has been inserted into an opening slot. The coil S3u1 is fixed to the stator core S1 with these coil stopping sections S4a3.

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 such as a reluctance motor.
The present invention relates to a device for fixing a coil to a stator core in which a coil side is inserted into an open slot formed between two magnetic pole portions of stator cores adjacent in the circumferential direction.

[0002]

2. Description of the Related Art A stator of a reluctance motor includes a stator core made of a soft magnetic material having a plurality of pairs of magnetic pole portions protruding inward in a radial direction and extending in an axial direction on an inner periphery thereof. And a multi-phase coil fixed to the stator core while inserting a coil side into an open slot formed between the two magnetic pole portions. The stator core is generally formed by axially laminating and integrating a number of soft magnetic material plates having the cross-sectional shape of the stator core. As shown in the figure, the coil is fixed to the stator core by inserting the coil side of the coil into the open slot, and then, inserting a wedge into a pair of substantially triangular grooves formed on the opposing edges of two adjacent magnetic pole portions of the stator core. This is achieved by driving both edges. These matters are described, for example, in "Induction Machine (1)" issued by Ohm Co., Ltd. on October 31, 1972.

[0003]

In the conventional apparatus using a wedge for fixing the coil to the stator core, the groove into which the wedge is driven is present over the entire axial length of each magnetic pole part. Since the magnetic resistance decreases at each position and the magnetic resistance of each magnetic pole part increases, it is not suitable for configuring a small-sized and high-output motor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a small-sized and high-output motor which is more advantageous than a conventional device.

[0005]

According to a first aspect of the present invention, there is provided a stator core made of a soft magnetic material having a plurality of pairs of magnetic pole portions protruding radially inward and extending in the axial direction provided on an inner periphery thereof. A stator of an electric motor having a coil side inserted into an open slot formed between two magnetic pole portions adjacent to each other in a circumferential direction and having a plurality of phase coils fixed to the stator core; At both ends in the direction, the magnetic pole portion is provided on the inner periphery and finger-shaped portions provided on both sides in the circumferential direction of the tip portion of the magnetic pole portion are bent toward the coil to form a coil locking portion. A stator for an electric motor, wherein a plate made of a soft magnetic material is provided.

[0006]

FIG. 1 is a schematic cross-sectional view of a reluctance motor according to the present invention. In FIG.
The reluctance motor 10 includes a rotor R and a stator S surrounding the outer periphery of the rotor R. The rotor R has a rotation axis R
1 and a rotor core R2 integrally coupled to the rotation shaft R1. On the outer periphery of the rotor core R2, four pairs of magnetic pole portions R2a1, R2a2, R2b1, R2 protruding radially outward.
b2, R2c1, R2c2, R2d1, R2d2 are provided. The stator S protrudes inward in the radial direction.
A pair of magnetic pole parts S1a1, S1a2, S1b1, S1b2,
S1c1, S1c2, S1d1, S1d2, S1e1,
Open slots S2a, S2b, S2c, S formed between a stator core S1 having S1e2, S1f1, and S1f2 provided on the inner circumference thereof and two magnetic poles adjacent in the circumferential direction.
2d, S2e, S2f, S2g, S2h, S2i, S2
j, S2k, U2 phase coils S3u1, S3u2, S3u3, S inserted in S2l and fixed to stator core S1
3u4, V-phase coils S3v1, S3v2, S3v3, S
3v4, W-phase coils S3w1, S3w2, S3w3, S
3w4.

[0007] As shown in FIG. 2, the stator core S1 comprises:
A large number of silicon steel (soft magnetic material) plates S4a and S4b having the cross-sectional shape of the stator core S1 are laminated in the axial direction and integrally joined. Therefore, the twelve magnetic pole portions S1a1 to S1f2 are formed in the axial direction. Are extended. Similarly, the rotor core R2 is
Are formed by superposing a plurality of silicon steel plates having the cross-sectional shapes described above on each other in the axial direction and integrally connecting them. Therefore, the eight magnetic pole portions R2a1 to R2d2 extend in the axial direction.

[0008] Of the many silicon steel plates S4a and S4b constituting the stator core S1, the twelve magnetic pole portions S4a1 of the two silicon steel plates S4a located at both ends in the axial direction are shown in FIG.
As shown in the figure, finger-shaped portions S4a2 are formed on both sides in the circumferential direction of the tip portion. On the other hand, as shown in FIG. 4, no finger is formed at the tip of the twelve magnetic pole portions S4b1 of the other silicon steel plate S4b.

As is well known, the coil S3u1 is disposed outside the pair of coil sides S3u1a and the open slots S2a and S21 arranged in the open slots S2a and S21 on both sides in the circumferential direction of the corresponding magnetic pole portion S1a1 of the stator core S1. It has a substantially rectangular ring shape having a pair of coil ends S3u1b, and after being formed into a substantially rectangular ring shape, the coil side S3u1a is opened together with the insulating member S5 in the open slot S2.
a, opening slot S2 from the opening at the radial inner end of S2l
a, Insert into S21. Then, as shown in FIG.
The finger S4a2 of the magnetic pole portion S4a1 of the silicon steel plate S4a is bent toward the coil side S3u1a to form the coil locking portion S4a3, thereby connecting the coil S3u1 to the stator core S1.
Fixed to. Thus, the coil S3u1 has two coil locking portions S4a3 of the silicon steel plate S4a at one axial end of the stator core S1 and two coil locking portions S4a3 of the silicon steel plate S4a at the other axial end of the stator core S1. It is fixed to the stator core S1 by the coil locking portion S4a3.

The other shapes of the coils S3u2 to S3w4 and the structure for fixing them to the stator core S1 are as follows.
It is the same as the shape of 3u1 and the fixing structure to the stator core S1.

After fixing the coils S3u1 to S3w4 to the stator core S1, the coils S3u1 to S3w4 are impregnated with varnish or the like.

In the stator S configured as described above,
Silicon steel plates S4a, S4 at both axial ends of stator core S1
The cross-sectional area of the tip of each of the twelve magnetic pole portions S4a1a is reduced by providing the coil locking portion S4a3, but the cross-sectional area of the twelve magnetic pole portions S4b1 of the other silicon steel plate S4b is not reduced. The cross-sectional area of the twelve magnetic pole portions S1a1 to S1f2 of S1 is substantially equal to the case where the coil locking portion S4a3 is not provided. Therefore, the stator core S
The magnetic reluctance of the first magnetic pole portions S1a1 to S1f2 is smaller than that of the conventional device, which is more advantageous than that of the conventional device in forming a small-sized and high-output motor.

In FIG. 5, the coil locking portion S4a3 is brought into contact with the insulating member S5. However, as shown in FIG. 6, the coil holding plate S6 having high bending rigidity is provided between the coil locking portion S4a3 and the insulating member S5. May be interposed, and the coil may be supported by the coil pressing plate S6 from the radially inner side over the entire length in the axial direction.

In FIG. 3, the finger S4a2 is connected to the magnetic pole S
4a1 was formed so as not to protrude inward in the radial direction from the inner end in the radial direction. However, as shown in FIG. 7, the finger-shaped portion S4a2 was formed so as to protrude inward in the radial direction from the inner end in the radial direction of the magnetic pole portion S4a1. It may be formed.

The stator S1 has a large axial length, and two silicon steel plates S4a at both ends of the stator core S1.
If there is a concern that the coil is not sufficiently fixed to the stator core S1 with only the four coil locking portions S4a3 formed as described above, as shown in FIG. What is necessary is just to install also in the axial direction center part in the stator core S1.

Further, the steel plate S4a forming the coil locking portion S4a3 may be formed from a cold-rolled steel plate for a mechanical structure.

Furthermore, the silicon steel sheet S of the stator core S1
As shown in FIG. 9, the portion constituted by 4b may be constituted by a block S4c molded using a powder of a soft magnetic material.

[0018]

As described above, in the invention of this application, the magnetic pole portions are provided on the inner circumference at least at both ends in the axial direction of the stator core, and the magnetic pole portions are provided on both sides in the circumferential direction of the distal end portion of the magnetic pole portion. Since a plate made of a soft magnetic material having a coil locking portion formed by bending a finger portion toward the coil side of the coil is provided, the magnetic resistance of the magnetic pole portion of the stator core is smaller than that of the conventional device, and therefore the size is small. It is more advantageous than a conventional device in configuring a high-power motor.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a cross section of a reluctance motor.

FIG. 2 is a view showing a part of a longitudinal section of a stator core.

FIG. 3 is a diagram showing magnetic pole portions of silicon steel sheets located at both ends in the axial direction among silicon steel sheets forming a stator core.

FIG. 4 is a diagram showing magnetic pole portions of silicon steel sheets located at positions other than both ends in the axial direction among silicon steel sheets forming a stator core.

FIG. 5 is a diagram showing a structure for fixing a coil to a stator core.

FIG. 6 is a view showing a modified example of a structure for fixing a coil to a stator core.

FIG. 7 is a view showing a modification of the magnetic pole portions of the silicon steel sheets located at both ends in the axial direction among the silicon steel sheets forming the stator core.

FIG. 8 is a view showing a modified example of a structure for fixing a coil to a stator core.

FIG. 9 is a view showing a modified example of a structure for fixing a coil to a stator core.

[Explanation of symbols]

 Reference Signs List 10 reluctance motor S stator S1 stator core S1a1 to S1f2 magnetic pole parts S2a to S21 open slots S3u1 to S3w4 coils S4a and S4b silicon steel sheet S4c -Block S4a1, S4b1 ... Magnetic pole part S4a2 ... Finger part S4a3 ... Coil locking part

Claims (1)

[Claims] 1. A stator core made of a soft magnetic material having a plurality of pairs of magnetic pole portions projecting radially inward and extending in an axial direction provided on an inner periphery thereof, between two magnetic pole portions adjacent in the circumferential direction. In a stator of an electric motor including a coil side inserted into the formed open slot and a multi-phase coil fixed to the stator core, at least at both axial end portions of the stator core, the magnetic pole portion is provided on an inner periphery; A plate made of a soft magnetic material having a coil locking portion formed by bending finger-shaped portions provided on both sides in the circumferential direction of the tip portion of the magnetic pole portion toward the coil is provided. Stator of electric motor.