JP2004248471A - Stator piece and motor stator using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize obtaining of a motor stator and stator pieces in which an insulator can be thinned in order to enhance the moldability of the insulator and to hold the strength of the insulator after the thick part of the insulator is molded by securing a resin supply path even at a split core yoke side. <P>SOLUTION: A split core is formed by laminating a plurality of thin plate-like silicon steel sheets in which teeth 82 are provided on the inner periphery of a circular arc-like yoke. The insulators are integrally molded on the inner periphery 81c of the yoke and the side faces of the teeth in the circumferential and axial directions of the teeth. In the stator piece in which a stator coil is wound on the teeth, recesses 16 are provided on the inner periphery of the yoke of the split core. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stator piece as a minimum unit constituting a motor stator, and more particularly to a stator piece made of laminated electromagnetic steel sheets.
[0002]
[Prior art]
2. Description of the Related Art It has been well known that a stator piece is formed by laminating a number of electromagnetic steel sheets (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP 2000-333388 A
The one described in Patent Document 1 is intended to reduce the eddy current loss of the stator and to provide a small and efficient motor at a low cost. For this purpose, an insulator is integrally formed on the stator piece. Laser welding for fixing the stator pieces can be omitted. However, it has been found that this also has the following disadvantages.
Hereinafter, the stator piece described in Patent Document 1 will be described with reference to FIGS.
5 is a side sectional view showing a conventional motor, FIG. 6 is a sectional view taken along line AA in FIG. 5, and the rotor is not shown for simplicity. FIG. 7 is a front view showing a split core. FIG. 8 is a perspective view of the stator piece before the stator coil is wound.
In the drawing, 1 is a motor, 2 is a motor frame, 3 is a load-side bracket attached to the load-side end of the frame 2, and 4 is an anti-load-side bracket attached to the non-load-side end of the frame 2. is there.
Reference numeral 5 denotes a stator mounted on the inner peripheral surface of the frame 2 and has a stator core 6 and a stator coil 7.
The stator core 6 includes a yoke outer peripheral portion 81a on a circular arc having the same center as the center axis of the stator 5 shown in FIG. 5, and both ends of the yoke which are line segments from both ends of the yoke outer peripheral portion 81a inward in the motor radial direction. 81b, a yoke portion 81 having a shape surrounded by a yoke inner peripheral portion 81c which is a string connecting the inner ends of the yoke both end portions 81b, a tooth portion 82 provided at a right angle to the yoke inner peripheral portion 81c, and a tooth portion 82 The circumferential ends of a plurality of T-shaped split cores 8 formed of teeth tips 83 provided at the end opposite to the yoke 81 are connected to each other in a ring shape. For the sake of simplicity, for example, a convex portion 9 and a concave portion 10 are formed at both ends 81b of the yoke, and the respective convex portions 9 and concave portions 10 are engaged with each other.
In addition, the yoke portion 81, the tooth portion 82, and the tooth tip portion 83 are formed by integrally punching a silicon steel plate and laminating the same to form the divided core 8.
As shown in FIG. 8, an insulator 11 is integrally formed with the split core 8 to form a stator piece 12. The insulator 11 includes a cylindrical body 11a and flanges formed at both ends thereof. 11b and 11c.
The stator coil 7 is wound around the cylindrical body 11a of the insulator 11. A predetermined number of stator pieces 12 after coil winding are connected to form a stator 5.
The stator 5 is fitted and fixed to the inner peripheral surface of the frame 2.
Reference numeral 13 denotes a rotating shaft rotatably supported by both brackets 3 and 4 via a bearing 14. A rotor 15 is fitted and fixed to a central portion of the rotating shaft 15 so as to face the stator 5 via a radial gap. ing.
The rotor 15 has a rotor yoke 15a fitted and fixed to the rotating shaft 13, and a permanent magnet 15b fixed to the outer peripheral surface of the rotor yoke 15a.
[0005]
[Problems to be solved by the invention]
However, in the conventional motor stator, a cross section at the center in the stacking direction of the split cores 8 of the stator piece 12 is as shown in FIG. That is, as shown in FIG. 9, there is a thick portion of the insulator 11 on the divided iron core tip end portion 83 side, but the thickness of the insulator 11 in contact with the divided iron core yoke portion 81 and the split iron core tooth portion 82 is substantially constant. It is.
In such a state, the number of effective windings of the stator coil 7 is increased, and the number of turns of the stator coil 7 is increased or the motor is downsized with a motor of the same size, or the stator of heat generated in the stator coil 7 is Even if an attempt is made to reduce the thickness of the insulator 11 for the purpose of improving the transmission to the iron core 6, the formability of the insulator 11 is poor, the insulator 11 cannot be formed, and there is a limit in reducing the thickness of the insulator 11.
In other words, the pressure loss at the time of molding the resin is inversely proportional to the cube of the thickness of the molded product, assuming that the resin is a Newtonian fluid. While the portion functions as a resin supply passage, the thickened portion functioning as a resin supply passage is not provided on the divided core yoke portion 81 side, so that the pressure loss is large, the moldability is poor, and the resin is apt to be unfilled.
Further, even if molding is possible, there is a limit to the thickness reduction of the insulator 11 in terms of strength, for example, the strength of the molded product is low and cracks occur.
Therefore, an object of the present invention is to provide a motor stator capable of securing a resin supply path also on the divided core yoke side, improving the moldability of the insulator, increasing the strength of the molded product, and reducing the thickness of the insulator. It is in.
[0006]
[Means for Solving the Problems]
In order to solve the above problem, the invention of the stator piece according to the first aspect of the present invention is to form a divided iron core by laminating a plurality of thin silicon steel plates having teeth portions on the inner periphery of an arc-shaped yoke portion. An insulator is integrally formed on an inner peripheral portion of the yoke portion and circumferential and axial side surfaces of the teeth portion, and a stator coil is wound around the teeth portion. A recess is provided in the inner peripheral portion of the yoke portion of the iron core.
According to the above configuration, since the thick portion of the insulator is formed also on the split core yoke side, a resin supply path can be secured also on the split core yoke side, and the moldability of the insulator is improved.
Further, the strength of the insulator after molding can be maintained by the thick portion of the insulator, so that it is possible to obtain a motor stator capable of reducing the thickness of the insulator.
According to a second aspect of the present invention, in the stator piece according to the first aspect, the depression passes through an innermost point of both ends of the yoke of the split core, and a center of the recess coincides with a center axis of the stator. Further, the present invention is characterized in that the teeth are located on both ends of the divided core yoke with respect to a line extending in the direction of the divided core yoke in the circumferential direction of the teeth.
According to the above configuration, the minimum width of the split core yoke portion is not different from the case where no depression is provided, so that it is possible to obtain a motor stator capable of reducing the thickness of the insulator without affecting the motor characteristics.
According to a third aspect of the present invention, in the stator piece according to the second aspect, the depression is located at both ends of the split core yoke.
With the above configuration, the minimum width portion of the split core yoke portion is shortened, and is limited to a portion away from the teeth portion, so that the influence on the peak torque is small. It is possible to obtain a motor stator that can be realized.
According to a fourth aspect of the present invention, in the stator piece according to the second aspect, the recess is in contact with a tooth base of the split core yoke.
With the above configuration, the distance between the thick portion and the end of the yoke is ensured, so that burr does not easily occur at the end of the yoke, and a resin having good flowability can be used. It is possible to obtain a motor stator that can be made thinner.
According to a fifth aspect of the present invention, there is provided a motor stator wherein a predetermined number of stator divided bodies each having a winding wound around the stator piece according to any one of the first to fourth aspects are joined and fixed. Features.
According to the above configuration, since a stator piece having high moldability of the insulator and high strength of the molded product is used, a motor stator having high moldability of the insulator and high strength of the molded product can be obtained.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
A motor stator according to a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram illustrating a split core according to the first embodiment of the present invention. (A) is a front view of the split core according to the first embodiment of the present invention, and the inner circumference of a conventional split core yoke is indicated by a dotted line at the same time. (B) is a sectional view of the stator piece at the center in the stacking direction of the split core according to the first embodiment of the present invention.
As shown in FIG. 1A, the first embodiment of the present invention is characterized in that the depression 16 is provided in the yoke inner peripheral portion 81c of the split core 8. Therefore, a cross section of the stator piece 12 at the center in the thickness direction of the divided cores 8 is as shown in FIG. 1B.
With such a configuration, as shown in FIG. 1B, a thick portion is formed also on the yoke portion 81 side of the split core of the insulator 11, so that the resin supply path is also provided on the yoke portion 81 side. Since the insulator 11 can be secured, the moldability of the insulator 11 can be enhanced, and the strength of the insulator 11 after molding is increased by the thick portion, it is possible to obtain a motor stator capable of making the insulator 11 thinner. .
As shown in FIG. 2, the depression 16 passes through the innermost point of both ends 81b of the divided core yoke, the center of which is inside the circle 17 that coincides with the center axis of the stator, and the division of the circumferential side surface of the teeth portion. It is preferable to be on both ends of the split core yoke (the hatched portion 19 is shown as a recessed position area in FIG. 2) with respect to the extension line 18 in the direction of the core yoke.
In other words, the width of the divided core yoke portion 81 is the narrowest at both ends 81b of the divided core yoke. If the depression 16 is located in the depression position area 19, the minimum width of the divided core yoke is unchanged, and the characteristics of the motor are not changed. Has no effect.
[0008]
Next, a motor stator according to a second embodiment of the present invention will be described with reference to FIG.
FIG. 3 is a diagram illustrating a split core according to the second embodiment of the present invention. (A) is a front view of the split core according to the second embodiment of the present invention, and (b) is a stator piece at the center in the stacking direction of the split core according to the second embodiment of the present invention. FIG.
As shown in FIG. 3A, in the second embodiment of the present invention, the recess 16 provided in the split core 8 is in contact with both ends 81b of the yoke of the split core and is separated from the teeth 82 of the split core. The feature is that it is provided only for
According to such a configuration, the minimum width portion of the yoke portion of the split iron core is shortened, and is limited to a place away from the teeth portion. Thus, it is possible to obtain a motor stator capable of reducing the thickness of the insulator 11.
[0009]
A motor stator according to a third embodiment of the present invention will be described with reference to FIG.
FIG. 4 is a diagram illustrating a split core according to the third embodiment of the present invention. (A) is a front view of the split core according to the third embodiment of the present invention, and (b) is a stator piece at the center in the stacking direction of the split core according to the third embodiment of the present invention. FIG.
As shown in FIG. 4 (a), in the third embodiment of the present invention, the depression 16 provided in the split core 8 is provided in contact with the base of the split tooth portion 82 of the inner peripheral portion 81c of the split core yoke. The feature is that.
According to such a configuration, since the distance between the thick portion and both ends 81b of the split core yoke is ensured, burrs are less likely to be generated at both ends 81b of the yoke of the split core, and a resin having good flowability is used. Therefore, it is possible to obtain a motor stator in which the thickness of the insulator can be reduced.
[0010]
【The invention's effect】
As described above, according to the stator piece of the first aspect, a divided iron core is formed by laminating a plurality of thin silicon steel sheets each having a teeth portion provided on an inner peripheral portion of an arc-shaped yoke portion, An insulator is integrally formed on the inner peripheral portion of the yoke portion and a circumferential and axial side surface of the teeth portion, and a stator piece is formed by winding a stator coil around the teeth portion. Since the recess is provided in the inner peripheral portion of the yoke portion, a thick portion of the insulator is also formed on the divided core yoke side, so that a resin supply path can be secured also on the divided core yoke side, and the moldability of the insulator is enhanced.
Further, the strength of the insulator after molding can be maintained by the thick portion of the insulator, so that it is possible to obtain a motor stator capable of reducing the thickness of the insulator.
According to the second aspect of the present invention, in the stator piece according to the first aspect, the depression passes through the innermost point at both ends of the yoke of the split core and the center thereof is inside a circle whose center coincides with the center axis of the stator. In addition, since the teeth are located on both ends of the divided core yoke with respect to the extension line of the circumferential side surface of the teeth in the direction of the divided core yoke, the minimum width of the divided core yoke is not different from the case where no depression is provided. Further, it is possible to obtain a motor stator capable of reducing the thickness of the insulator without affecting the motor characteristics.
According to the third aspect of the present invention, in the stator piece according to the second aspect, since the recesses are located at both ends of the divided core yoke, the minimum width of the divided core yoke is reduced, and The motor stator is limited to a distant place, and in particular, the influence on the peak torque is small, and it is possible to obtain a motor stator capable of reducing the thickness of the insulator even in a motor that emphasizes the peak torque.
According to the fourth aspect of the present invention, in the stator piece according to the second aspect, since the recess is in contact with the teeth base of the split core yoke, the distance between the thick portion and the end of the yoke is ensured. As a result, burrs are less likely to be generated at the end of the yoke, a resin having good flowability can be used, and the thickness of the insulator can be further reduced.
According to the motor stator according to the fifth aspect, a predetermined number of stator divided bodies each having a winding wound around the stator piece according to any one of the first to fourth aspects are joined and fixed to each other. A high motor stator having high moldability and high molded product strength can be obtained.
[Brief description of the drawings]
FIGS. 1A and 1B show a split core according to a first embodiment of the present invention, wherein FIG. 1A is a front view and FIG. 1B is a cross-sectional view of a stator piece at a central portion in the stacking direction of the split core.
FIG. 2 is a diagram for explaining the definition of a depression according to the present invention.
FIGS. 3A and 3B show a split core according to a second embodiment of the present invention, in which FIG. 3A is a front view, and FIG. 3B is a cross-sectional view of a stator piece at the center in the stacking direction of the split core.
FIGS. 4A and 4B show a split core according to a third embodiment of the present invention, wherein FIG. 4A is a front view and FIG. 4B is a cross-sectional view of a stator piece at the center in the stacking direction of the split core.
FIG. 5 is a side sectional view showing a conventional motor.
6 is a cross-sectional view taken along the line AA in FIG. 5, in which a rotor is not shown for easy understanding.
FIG. 7 is a front view showing a conventional split core.
FIG. 8 is a perspective view of a conventional stator piece before winding a stator coil.
FIG. 9 is a cross-sectional view of a conventional stator piece before winding a stator coil.
[Explanation of symbols]
1 motor,
2 frames,
3 Load side bracket,
4 anti-load side bracket,
5 Stator,
6 Stator core,
7 stator coils,
8 split cores,
81 yoke part,
81a yoke outer periphery,
81b Both ends of the yoke,
81c yoke inner circumference,
82 teeth section,
83 teeth tip,
9 convex part,
10 recess,
11 insulators,
11a cylindrical part,
11b, 11c collar,
12 stator pieces,
13 axis of rotation,
14 bearings,
15 rotor,
15a rotor yoke,
15b permanent magnet,
16 hollow
17 a circle that passes through the innermost point at both ends of the yoke and whose center coincides with the central axis of the stator;
18 Extension line of the split core on the circumferential side surface of the teeth in the direction of the yoke,
19 Depression position area

Claims (5)

A plurality of thin silicon steel plates each having a tooth portion provided on an inner peripheral portion of an arc-shaped yoke portion are laminated to form a divided core, and a circumferential direction and an axial direction of the inner peripheral portion of the yoke portion and the teeth portion are formed. A stator piece formed by integrally molding an insulator on the side face of the stator piece and winding a stator coil around the teeth portion.
A stator piece, wherein a recess is provided in an inner peripheral portion of a yoke portion of the split iron core. The recess extends through the innermost point at both ends of the yoke of the split core, the center thereof is inside a circle that coincides with the central axis of the stator, and the teeth circumferential side surface extends in the direction of the split core yoke. The stator piece according to claim 1, wherein the stator pieces are located on both ends of the split core yoke with respect to a wire. 3. The stator piece according to claim 2, wherein the depressions are located at both ends of the split core yoke. 3. The stator piece according to claim 2, wherein the recess is in contact with a tooth base of the split core yoke. A motor stator comprising a stator piece according to any one of claims 1 to 4 and a predetermined number of stator divided bodies having windings wound thereon are joined and fixed.

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