JPH10145991A - Stator for motor and motor frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease a waste steel material amount to a minimum limit after punching and enhance a space factor of a winding in each slot, by forming an arbitrary pole piece and a pole piece provided adjacent to this arbitrary pole piece made capable of rotating in an arbitrary angular range with a connection point in an end part of a back yoke serving as a support point. SOLUTION: In a batten 1, in one end part of a crescent-shaped back yoke 2, a circular protrusion 2a is provided, in another end part, a circular notched groove 2b corresponding to the circular protrusion 2a is provided, the protrusion 2a of the other batten 1, when it is inserted to this notched groove 2b, can be rotated in an arbitrary angle with the center of the protrusion 2a serving as the support point. By shaping a pole piece 2 thus formed, an amount of waste steel material left after punching can be suppressed. By winding a winding 5 to teeth main unit 3a in a state of a divided stator 8, in the case of forming a slot, a space factor of the winding 5 in the slot can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A stator core formed by laminating a core formed by a plurality of teeth and a back yoke for connecting these teeth, and winding the stator core around each tooth. The present invention relates to a stator for a motor, comprising: a winding;

[0002]

2. Description of the Related Art A conventional stator having an inner rotor type stator which is a brushless DC motor will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a front view of a conventional motor stator. FIG. 7 is a front view illustrating a method of winding the stator core of FIG.

In FIG. 6, a stator core 25 is formed by stacking punched plates formed by punching a hoop material made of a steel plate. The punched plate includes a back yoke 26 formed in a ring shape and twelve teeth 27 extending from the back yoke 26 toward the axial center. This tooth 27 is formed in a T shape,
A tooth body 27a around which the winding 28 is wound and a converging portion 27b formed in a square shape for converging magnetism.

[0004] A winding 28 is wound around each tooth body 27a of the stator core 25 to form a stator 29. An insulating material 30 for electrical insulation is provided between the winding 28 and the stator core 25.

In FIG. 7, a method of winding the winding 28 around the teeth body 27a of the stator 29 shown in FIG. 6 is usually performed by using a nozzle 31 having a hollow thin tube inside. That is, the winding 28 is passed through the inside of the nozzle 31 and the nozzle 3
The leading end of the winding 28 passing through the inside 1 is fixed at an arbitrary position, and the leading end of the nozzle 31 is circulated around the tooth main body 27a to wind the winding 28 around the tooth main body 27a.

[0006]

As described above, in the conventional stator core, a steel plate is punched out to form a blank, but the steel plate in the slot portion of the stator core is not required. Further, when the steel plate at the inner diameter of the stator core is not used as the yoke of the rotor, the inner diameter is unnecessary, and is treated as waste material.

[0007] Further, when winding the teeth around the teeth with the nozzle, it is necessary to make the width of the opening larger than the diameter of the nozzle. Therefore, the rotor rotates, and the pulsation when the boundary between the poles of the permanent magnet passes through the opening increases. Furthermore, since the winding is wound by inserting the nozzle inside the slot, a space that does not interfere with the winding wound on the adjacent teeth is required in the slot, and the ratio of the winding to the slot area, The space factor is low.

[0008]

Therefore, according to the present invention, an arbitrary pole piece and a pole piece provided adjacent to the pole piece can be arbitrarily set at a connection point at the end of the back yoke. Provided is a motor stator characterized by being rotatable freely within an angle range.

Another object of the present invention is to provide a motor frame characterized in that the above-described motor stator is formed by molding a resin or a premix.

[0010]

[Function] A winding is wound around a pole piece, and a circular projection provided at the end of the back yoke of each pole piece is inserted into a circular notch groove and connected to form a belt-shaped stator. I do. Then, an insulating material is inserted into the center of the slot to insulate between the windings. Then, the back yoke of the pole piece is formed in a ring shape to form the stator.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to FIGS. FIG. 1 is a plan view of a blank plate according to the present invention. FIG. 2 is a front view for explaining a winding method when winding a coil around a pole piece. FIG. 3 is a front view illustrating a method of connecting the pole pieces. FIG. 4 is an enlarged sectional view taken along line AA of FIG. FIG. 5 is a front view of a stator formed in a ring shape.

In FIG. 1, a punched plate 1 is formed of a back yoke 2 formed in a crescent shape and teeth 3 extending from the inner periphery of the back yoke 2 toward the center of the shaft. A circular projection 2a is provided at one end of the back yoke 2, and a circular cutout groove 2b corresponding to the circular projection 2a is provided at the other end. When the projection 2a of the other punched plate 1 is inserted into the cutout groove 2b, a free joint that can rotate freely around the center of the projection 2a and at an arbitrary angle is formed. The teeth 3 include a tooth main body 3a around which a later-described winding is wound, and a converging portion 3b formed in a shape to converge magnetism.

Further, by forming the pole piece 2 in such a shape, the amount of waste material of the steel plate remaining after the punching can be suppressed as compared with the conventional ring-shaped state in which the steel plate is punched.

In FIG. 2, the pole piece 4 is formed by stacking punched plates 1. And pole piece 4
An insulating material 6 is provided in order to electrically insulate the wire 5 wound around the tooth body 3a.

Then, by winding the nozzle 7 through which the winding 5 is passed around the teeth body 3a of the pole piece 4, the winding 5 is wound around the teeth body 3a to form the split stator 8. .

As described above, in the state of the split stator 8, the winding 5
, The space factor of the winding 5 in the slot can be improved when a slot described later is formed. Furthermore, since the operating range of the nozzle 7 is not limited by the opening width unlike the conventional stator, the winding 5 can be wound without considering the space for operating the nozzle 7. Therefore, the space factor can be improved as compared with the related art.

Further, the opening width can be determined regardless of the diameter of the nozzle 7. In other words, the width may be set so that the magnetic force does not cause a short circuit between the converging portions 3b of the adjacent teeth 3.

In FIG. 3 and FIG. 4, when forming a stator having, for example, 12 slots,
The belt-shaped stator 9 is formed by individual connection. That is, the projection 2a provided on one split stator 8 is inserted into the cutout groove 2b of the split stator 8 adjacent to the split stator 8. At this time, the cut-out grooves of the several cut-out plates 1 on the side where the projections 2a are inserted are formed into cut-out grooves 2c slightly wider than the cut-out grooves 2b of the other cut-out plates 1 so as to enter. As a result, the protrusion 2a can be easily inserted. Thereby, the belt-shaped and multi-joint stator 9 can be formed.

When the stator 9 is in the shape of a strip, the insulating material 10 is inserted between the winding 5 and the winding 5 housed in the same slot 11 as the winding 5. Belt-shaped stator 9
In this state, the insulating material 10 can be easily inserted by inserting it. That is, when the back yoke 2 is formed in a ring shape as described later, the gap between the windings 5 housed in the same slot 11 becomes narrow, and it becomes difficult to insert the insulating material 10.

In FIG. 5, the back yoke 2 is formed in a ring shape with the teeth 3 facing the axis center, and both ends of the back yoke 2 are connected to form an inner rotor type stator 12. At this time, as shown in the figure, the end of the back yoke 2 of the pole piece 4 connected to both ends may be formed flat and fixed by an adhesive or welding to form the stator 12.

Also, by changing the rotatable angle of the connecting portion of the back yoke so that the teeth become radial,
An outer rotor type stator (not shown) is formed by forming a back yoke in a ring shape and connecting both ends of the back yoke.
Can also be formed.

Even if the above-described stator according to the present invention is inserted into a conventional steel-made motor frame to assemble the motor, the outer periphery of the stator according to the present invention is used to connect a back yoke. Since the connecting portion exists, it is difficult to assemble the motor based on the outer peripheral portion of the stator. That is, the mounting accuracy of a bearing or the like mounted on the motor frame deteriorates.

Accordingly, the stator is molded from resin or premix to form a motor frame. That is, since the motor frame can be easily configured with reference to the inner peripheral portion of the stator, a motor frame with high assembly accuracy can be configured when assembling the motor.

If the back yoke is connected and the winding is wound in a state where the teeth are arranged in parallel, the winding device is installed so as to correspond to each of the teeth, and the winding is wound at a time. Can be wound.

[0025]

According to the present invention, the amount of waste material of a steel sheet after punching a blank can be minimized.

In the inner rotor type stator, the space factor of the winding in each slot can be improved. Further, the width of the opening of the stator can be reduced. Further, the insulating material can be easily inserted by the winding even if there is almost no gap in the slot.

[0027]

[Brief description of the drawings]

FIG. 1 is a plan view of a punched plate according to the present invention.

FIG. 2 is a front view illustrating a winding method when winding a winding around a pole piece.

FIG. 3 is a front view illustrating a connection method of each pole piece.

FIG. 4 is an enlarged sectional view taken along line AA of FIG. 3;

FIG. 5 is a front view of a stator formed in a ring shape.

FIG. 6 is a front view of a conventional motor stator.

FIG. 7 is a front view illustrating a method of winding the stator core of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Die plate 2, 26 ... Back yoke 3, 27 ... Teeth 4 ... Pole piece 5, 28 ... Winding 6, 10, 30 ... Insulation material 7, 31 ... Nozzle 8 ... Split stator 9, 12, 29 ... Fixed Child 11 ... slot 25 ... stator core

Claims (2)

[Claims] A winding is wound around a pole piece consisting of one tooth and a back yoke, and a plurality of pole pieces wound with this winding are connected at each end of the back yoke. A motor stator formed by making the yoke into a ring shape, wherein an arbitrary pole piece and a pole piece provided adjacent to the pole piece have an arbitrary angle with respect to a connection portion at an end portion of the back yoke. A motor stator characterized by being rotatable freely within the range. 2. A motor frame, wherein the motor stator according to claim 1 is formed by molding with a resin or a premix.