JP2013017267A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator core which generates no large distortion at connection parts between a peripheral iron core and tooth part cores even when split core structure, composed of the peripheral iron core and the tooth part cores made separately one by one, is used, and to provide a motor having the same.SOLUTION: In a motor of a split core system which is split into each tooth, a peripheral iron core is formed with a non-directional electromagnetic steel plate and tooth part cores are configured with a directional electromagnetic steel plate. The peripheral iron core and the tooth part cores have different shapes at a central part and an end part, respectively, having a dovetail-shaped tenon only at the end part. A member between teeth is added at an adjacent tooth tip part.

Description

  The present invention relates to a rotating electrical machine and the like.

Conventionally, there has been proposed a motor including a stator core having a structure divided into a tooth portion iron core and an outer peripheral portion iron core. (For example, refer to Patent Document 1).
In this document, teeth that are separately prepared one by one are connected to the inside of the outer peripheral core, and a pigeon-shaped tenon is used for the connection. Moreover, the grain-oriented electrical steel sheet is used so that the easy direction of magnetization may face to the teeth part iron core in radial direction.

JP 2001-190038 A

  However, in the above, since a dovetail-shaped tenon is used for the connection between the teeth core and the outer core, after the tenon is connected, a large distortion occurs in the tenon periphery, and the distortion of the core part where the distortion has occurred There was a problem that magnetic characteristics deteriorated. Moreover, since adjacent teeth tip portions directly contact each other, there is a problem that leakage magnetic flux is generated and the generated torque of the motor is somewhat reduced.

Therefore, in the present invention, even in the case of using a divided core structure composed of the outer peripheral core and the tooth cores separately prepared one by one, large distortion is unlikely to occur at the joint between the outer peripheral core and the teeth core. The first object is to provide a rotating electrical machine.
It is a second object of the present invention to provide a rotating electrical machine that can reduce leakage magnetic flux at the tip of the teeth and suppress a decrease in torque generated by the rotating electrical machine.
Furthermore, it is a third object to provide a rotating electrical machine that can effectively dissipate heat generated in the winding of the rotating electrical machine to the load side bracket.

  In order to solve the above problems, according to one aspect of the present invention, a shaft rotatably held by a bracket, a rotor provided on the shaft and rotating together with the shaft, a stator core, and the stator core And a stator fixed to the bracket, wherein the stator core includes an annular outer peripheral core and an outer peripheral core at a joint surface. And teeth portion cores arranged radially in the outer peripheral portion iron core, and the shape of the outer peripheral portion iron core and the teeth portion iron core on the joint surface is the center and end in the axial direction of the shaft A rotating electrical machine characterized by different parts is applied.

According to the present invention, even in the case of using a split core structure composed of the outer peripheral core and the teeth cores separately created one by one, large distortion is unlikely to occur at the joint between the outer peripheral core and the teeth core. A rotating electrical machine can be provided.
In addition, the leakage magnetic flux can be reduced at the tip of the teeth, and the reduction in the torque generated by the rotating electrical machine can be suppressed.
Furthermore, the heat generated in the winding of the rotating electrical machine can be effectively radiated to the load side bracket.

Vertical sectional view of the motor of the present invention The perspective view of the teeth part iron core of this invention Cross-sectional view at the center of the core of the stator core of the present invention Cross-sectional view at the core end of the stator core of the present invention Peripheral iron core at the center of the core of the present invention Teeth core in the center of the core of the present invention The outer peripheral iron core at the core end of the present invention Teeth core at the core end of the present invention Enlarged view of the tip of the teeth core of the present invention

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a motor of the present invention. FIG. 2 is a perspective view of the teeth core of the present invention. FIG. 3 is a transverse cross-sectional view at the core central portion of the stator core of the present invention, and FIG. 4 is a transverse cross-sectional view at the core end portion of the stator core. FIG. 5 shows an outer peripheral core at the core central portion of the present invention, and FIG. 6 shows a teeth core at the core central portion. FIG. 7 shows an outer peripheral core at the core end of the present invention, and FIG. 8 shows a teeth core at the core end. FIG. 9 is an enlarged view of the tip of the teeth portion iron core of the present invention.

  1 to 9, the stator core 10 of the present invention includes an outer peripheral core 11 and a teeth core 12. The outer peripheral iron core 11 and the teeth iron core 12 are formed by laminating a plurality of thin electromagnetic steel plates. In this way, the necessary number of sheets are stacked and fixed so as not to fall apart by caulking, bonding, welding, or the like. A laminated core of non-oriented electrical steel sheets is used for the outer peripheral part iron core, and a laminated core of grain-oriented electrical steel sheets is used for the teeth part iron core. At that time, the direction of easy magnetization of the grain-oriented electrical steel sheet is matched with the longitudinal direction of the tooth portion iron core 12. In this specification, the iron core is also referred to as a core.

  Normally, the shape of the stator core is formed by laminating cores having the same shape. In this embodiment, the central portion (core central portion) and the end portion (core end portion) in the axial direction of the shaft 23 are used. The outer peripheral core 11 and the teeth core 12 have different shapes. That is, in the central part of the core, the joint surface between the teeth core 12 and the outer core 11 is a simple contact, but at the end of the core, the teeth core 12 and the outer core 11 are joined. The surface is a mortise joint.

  After the air core coil 17 that is separately wound around the teeth core 12 formed as described above is mounted, the coils 17 are sequentially mounted radially inside the outer core 11. At the time of the mounting, the tenons provided at the core end portions are mounted so that they are engaged with each other, and the teeth core 12 and the outer peripheral core 11 are in contact with each other at a simple surface in the center of the core. A slight gap is formed between the tips of adjacent teeth cores 12.

After all the teeth portion iron cores 12 have been attached, the inter-tooth member 14 is attached to the tip end portion of the teeth (the radially inner end of the teeth portion iron core 12). This inter-teeth member 14 is arranged at the lower part of the coil 17 so that it fits snugly into the slight gap at the tip of the tooth. The material of the inter-teeth member 14 is preferably a non-magnetic, insulating material, and a material with high thermal conductivity. Examples of such materials include alumina and aluminum nitride.
After mounting all the inter-teeth members 14, the entire stator is molded with a mold resin. At that time, the inter-tooth member 14 is also molded together with the air-core coil 17.

  The stator core 10 thus configured is mounted inside the frame 30. A load-side bracket 31 and an anti-load side on which a shaft 23, a rotor core 22 (an example of a rotor core), and a rotor having a permanent magnet 21 are disposed inside the stator core 10 and bearings 33 are mounted. A motor that is an example of a rotating electrical machine is configured to be supported by the bracket 32.

  Here, the easy magnetization direction of the teeth iron core 12 will be described in detail. As described above, when the teeth iron core 12 is punched from the grain-oriented electrical steel sheet as the material, the magnetization easy direction 16 is aligned with the longitudinal direction of the teeth. As shown in FIG. 4, the easy magnetization direction is oriented in the radial direction of the teeth. The direction of the magnetic flux flowing in the teeth is almost the radial direction of the teeth regardless of the rotation state of the motor, so the easy magnetization direction is aligned with the radial direction, so magnetic characteristics only in one direction of the grain-oriented electrical steel sheet This means that you can make full use of the advantages of being superior. Here, excellent magnetic characteristics mean that the magnetic flux density is high and the iron loss is small. Therefore, since the magnetic flux density of the teeth can be increased, the torque of the motor can be increased. In addition, since the iron loss can be kept small, the heat generation of the motor can be kept low.

  Next, the tenon will be described. In the stator core 10 of the present embodiment, the tenon portion is only the core end. The reason for this is that when the tenon is fastened, a distortion occurs around the tenon, and this distortion deteriorates the magnetic properties of the core. Therefore, in order to reduce the distortion as much as possible, the tenon is located only at the end of the core. The central part of the core has no tenon and the joint surface with the outer peripheral core is a simple contact, so that no distortion occurs and the magnetic properties of the core are not deteriorated. In addition, since the core center part and core edge part of a teeth part iron core are being fixed so that it may not fall apart by the above-mentioned caulking, adhesion | attachment, welding, etc., a core center part does not drop out. Furthermore, since the entire stator is molded with a mold resin, there is no problem in mechanical strength.

  Next, the inter-teeth member 14 will be described in detail. The inter-teeth member 14 is mounted to make the gaps between adjacent tooth tips uniform. Since unevenness of the gap at the tip of the teeth causes cogging torque, it is very important to make the gap uniform. Next, the length of the inter-teeth member 14 will be described. The length of the inter-teeth member 14 is sufficient as the laminated thickness of the stator core 10, but the inter-teeth member of the present embodiment is longer than the laminated thickness of the stator core 10. Yes. Specifically, it is extended toward a load side bracket 31 which is an example of a bracket so as to be in contact with the load side bracket 31. The reason why the inter-teeth member 14 is brought into contact with the load-side bracket 31 is to improve the heat dissipation performance. That is, the heat generated in the coil 17 is transmitted to the inter-teeth member 14 disposed in close contact with the lower part of the coil 17 (inner side in the radial direction of the coil), and further transmitted from the inter-teeth member 14 to the load side bracket 31. Since the motor is attached to the motor mounting plate or the like by the load side bracket 31, the heat transmitted to the load side bracket 31 is radiated to the outside through the motor mounting plate. As described above, the inter-teeth member 14 is made of a non-magnetic, insulating material, and a material having high thermal conductivity, so that the heat generated in the coil 17 can be effectively radiated to the outside. Temperature rise can be suppressed.

  In addition, the reason for providing a clearance gap between adjacent tooth tips is to reduce leakage magnetic flux. This is because if adjacent tooth tips are in close contact with each other, the leakage magnetic flux at the teeth tips increases and the generated torque decreases. In the present invention, a slight gap is provided at the tip of the teeth, and the above-mentioned non-magnetic inter-teeth member is mounted so that the gap is uniform, so that cogging torque is kept low and leakage magnetic flux is reduced. can do.

  As described above, according to the embodiment of the present invention, since the stator core composed of the teeth portion iron core and the outer peripheral portion iron core is used, the winding can be mounted from the outside of the teeth portion iron core. The rate can be made very high, and the motor characteristics can be significantly improved as compared with a method using an integral iron core. In addition, because a stator core with a split structure consisting of a teeth core and an outer peripheral core is used, a directional electrical steel sheet with significantly superior magnetic properties compared to non-oriented electrical steel sheets can be applied to the teeth core. Since the magnetic characteristics can be greatly improved, the performance of the motor can be greatly improved. Since the teeth portion iron core and the outer peripheral portion iron core are fastened to the tenon provided only at the core end portion, it is possible to suppress a decrease in magnetic characteristics due to distortion. Specifically, the torque generated by the motor is increased by improving the magnetic flux density, and the iron loss characteristic is improved by improving the iron loss characteristics, so that the heat generation of the motor can be reduced. In addition, since the gap between adjacent tooth tips can be made uniform in the inter-tooth member attached to the teeth tip, the cogging torque can be kept low, and the leakage magnetic flux can be reduced. Furthermore, since the inter-teeth member is in contact with the load side bracket, the heat generated in the coil can be effectively radiated to the outside through the load side bracket, so that the coil temperature can be kept low. it can. Therefore, the temperature of the motor can be kept low.

The embodiment of the present invention has been described above. However, it goes without saying that those skilled in the art can make appropriate modifications from this embodiment, and even if such modifications are made, they are also included in the technical scope of the present invention. deep.
For example, although a pigeon-shaped tenon is shown as a tenon shape in FIGS. Of course.

DESCRIPTION OF SYMBOLS 10 Stator iron core 11 Peripheral iron core 12 Teeth iron core 13 Tenon 14 Teeth member 15 Mold resin 16 Easy magnetization direction 17 Coil 20 Rotor 21 Permanent magnet 22 Rotor core 23 Shaft 30 Frame 31 Load side bracket 32 Anti-load side bracket 33 Bearing

Claims (6)

A shaft rotatably held by a bracket;
A rotor provided on the shaft and rotating together with the shaft;
A stator having a stator core and a coil mounted on the stator core, and fixed to the bracket;
A rotating electric machine with
The stator core is
An annular outer core,
Teeth cores that are in contact with the outer peripheral iron core at the joint surface and are arranged radially in the outer peripheral iron core;
Including
The rotating electrical machine according to claim 1, wherein the outer peripheral portion iron core and the tooth portion iron core on the joint surface are different in a central portion and an end portion in the axial direction of the shaft. The outer peripheral core and the teeth core are:
In the central portion, contact with a cross-section arc-shaped surface,
The rotating electrical machine according to claim 1, wherein the end portion is coupled with a tenon. 3. The rotating electrical machine according to claim 1, wherein the teeth portion iron core is formed of a grain-oriented electrical steel sheet oriented so that a direction of easy magnetization is directed in a radial direction. When the tip of the teeth portion iron core in the radial direction is the teeth tip,
The rotating electrical machine according to any one of claims 1 to 3, wherein an inter-teeth member is mounted between the two adjacent tip ends of the teeth. The rotating electrical machine according to claim 1, wherein the inter-tooth member is in contact with the bracket. The rotating electrical machine according to claim 1, wherein the inter-tooth member is in contact with a radially inner side of the coil.

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