JP2000341913A - Stator core for rotary electric machine and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of eddy currents on the punched end faces of a stator core formed by laminating blank stator materials upon another, without coating the end faces with insulating films. SOLUTION: A stator core for rotary electric machine is formed, by alternately laminating two kinds of blank stator materials 22 and 32 having different external forms upon another. Since the materials 22 and 32 have different external forms, all punched end faces of the formed stator core 20, such as the outer peripheral surfaces, inner peripheral surfaces, and end faces of tooth sections do not become smooth. Consequently, the occurrence of nonconformities such as efficiency deterioration due to heat generated from the core 20, etc., resulting form eddy currents which may occur, when the punched end faces are smooth can be prevent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core for a rotating electric machine and a method for manufacturing the same, and more particularly, to a method of laminating a plurality of stator members formed by punching a steel sheet coated on both sides with an insulating material into a predetermined shape. The present invention relates to a stator core for a rotating electric machine and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a laminated core of this type of rotating electric machine, a laminated core formed by laminating two types of core members having slightly different sizes of salient pole portions formed by punching a magnetic steel plate has been proposed. (For example, Japanese Utility Model Laid-Open No. 6-52347). This laminated core is formed by laminating a plurality of small-sized core members and sandwiching a return surface as a superposed surface by two core members having a large-sized surface coated with an insulating coating. The disadvantage caused by the return generated at the end face of the core member, for example, the disadvantage that the insulating layer is broken by the sharp edge of the return surface and short-circuited is avoided.

[0003]

However, in such a laminated core, since a plurality of core members of the same size are laminated on the inner side, there is a problem that an end surface of the laminated core conducts in the laminating direction to generate an eddy current. The eddy current causes the laminated core to generate heat, which causes a decrease in motor efficiency.

To solve such a problem, it is considered to apply an insulating coating to the lamination end face after lamination. However, the number of steps in the manufacturing process increases and the cost increases.

An object of the present invention is to provide a stator core for a rotating electric machine, which prevents generation of eddy current without applying an insulating coating to a laminated end face thereof after lamination, and achieves high efficiency. Further, a method of manufacturing a stator core of a rotating electric machine according to the present invention aims to manufacture a stator core having high efficiency without generating eddy current.

[0006]

SUMMARY OF THE INVENTION A stator core of a rotating electric machine and a method of manufacturing the same according to the present invention are provided.
The following measures were taken in order to achieve at least a part of the above objects.

A stator core of a rotating electric machine according to the present invention is a stator core of a rotating electric machine formed by stacking a plurality of stator materials formed by punching a steel plate coated on both sides with an insulating material. The gist of the present invention is that adjacent stator materials are laminated so that punched end faces are located at different positions.

In the stator core of the rotating electric machine according to the present invention, since the stator materials are laminated so that the punched end faces are located at different positions, conduction occurs when the punched end faces are aligned in the laminating direction, and eddy current does not occur on the end faces. . As a result, it is possible to prevent inconvenience caused by generation of eddy current on the end face, for example, inconvenience such as reduction in efficiency due to heat generation of the stator. Also, there is no need to apply an insulating coating to the punched end face.

In the stator core of the rotating electric machine according to the present invention, the stator material is laminated so that at least the punched end surface of the stator material corresponding to the distal end surface of the salient pole portion of the stator core is located at a different position. Can also. With this configuration, it is possible to prevent eddy current from being generated on the tip end surface of the salient pole portion.

In the stator core of the rotating electric machine according to the present invention, at least two types of stator materials formed in different shapes may be laminated so that adjacent stator materials are different types. In the stator core of the rotating electric machine according to the aspect of the present invention, the at least two kinds of stator materials may be formed by forming at least portions corresponding to salient pole portions of the stator core into different shapes. In this case, a portion corresponding to the salient pole portion may be formed by alternately stacking two types of stator materials having substantially similar shapes and different sizes. This can prevent eddy currents from being generated in the salient pole portions.

A method of manufacturing a stator core of a rotating electric machine according to the present invention is a method of manufacturing a stator core of a rotating electric machine. The gist of the present invention is to provide a stator material forming step of forming at least two types of stator materials, and a laminating step of laminating the formed at least two types of stator materials so that adjacent stator materials are of different types.

In the method of manufacturing a stator core for a rotating electric machine according to the present invention, a stator core whose punched end faces are not aligned in the laminating direction can be manufactured. That is, it is possible to manufacture a stator core that does not cause any disadvantage such as generation of eddy current on the punched end surface, for example, a decrease in efficiency due to heat generation of the stator.

In the method for manufacturing a stator core of a rotating electric machine according to the present invention, in the stator material forming step, at least portions corresponding to salient pole portions of the stator core form two types of stator materials having substantially similar shapes and different sizes. A step of laminating the two types of stator members alternately. With this configuration, it is possible to manufacture a stator core in which eddy current does not occur at least in the salient pole portion of the stator core.

[0014]

Next, embodiments of the present invention will be described with reference to examples. FIG. 1 is a partially enlarged view schematically illustrating an example of a tooth portion of a stator core 20 of a rotary electric machine according to an embodiment of the present invention. FIG. It is explanatory drawing which contrasts and illustrates 32 teeth parts 24 and 34. As shown in FIG.
Two types of stator materials 22 and 32 (hereinafter referred to as a first stator material 22) having different sizes formed in a comb-like annular shape.
And the second stator material 32) are alternately laminated.

The two stator materials 22, 32 are made of a magnetic steel plate,
For example, it is formed by stamping a silicon steel plate with a press die, and its outer shape is such that when the second stator material 32 is superimposed on the first stator material 22,
It fits inside the stator material 22. That is, the two stator materials 22 and 32 are the first stator material 2
2 is larger than the outer diameter R2 of the second stator material 32, the inner diameter r1 of the first stator material 22 is smaller than the inner diameter r2 of the second stator material 32,
The half width T1 of the teeth portion 24 of the second stator material 32
The length L1 of the teeth portion 24 of the first stator material 22 is formed to be the same as the length L2 of the teeth portion 34 of the second stator material 32. For this reason, the stator core 20 of the embodiment is formed by alternately laminating the first stator material 22 and the second stator material 32 on concentric circles, so that the outer peripheral surface, the inner peripheral surface, and the teeth portion of the stator core 20 are formed. All the punched end faces are stepped as illustrated in FIG.

Next, the manner of manufacturing the stator core 20 of the embodiment will be described. FIG. 3 is a manufacturing process diagram illustrating a state of manufacturing the stator core 20 of the embodiment. As shown in the figure, the stator core 20 according to the embodiment is formed by first punching out a magnetic steel plate, for example, a silicon steel plate, and forming the first stator blank 2.
2 and a step of forming the second stator material 32 (step S10). Since the outer shapes of the first stator material 22 and the second stator material 32 have been described above, they will not be described again.

When the first stator material 22 and the second stator material 32 are formed, the first stator material 22 and the second stator material 32 are alternately stacked on a concentric circle (step S12), and the stacked body is welded. (Step S
14), the stator core 20 is completed.

According to the stator core 20 of the embodiment described above, the stator core is formed by alternately laminating the first stator materials 22 and the second stator materials 32 having different outer shapes. , All the punched end faces of the teeth portion can be prevented from being aligned. As a result, it is possible to prevent inconvenience due to eddy current that may be caused by aligning the punched end faces, that is, inconvenience such as reduction in efficiency due to heat generation of the stator core. Further, since the punched end faces are not aligned, there is no need to apply an insulating coating to the punched end faces.

It is known that a motor using a stator core formed by laminating teeth having different tooth widths by half is effective in suppressing torque fluctuation. The stator core 20 of the embodiment is a stator material 2 having different teeth widths.
Since the stator cores 2 and 32 are alternately stacked, the appearance is different from the stator core in which the teeth having different tooth widths are stacked in half, but are electromagnetically equivalent, so that the motor using the stator core 20 of the embodiment is used. Can also exert an effect of suppressing torque fluctuation.

In the stator core 20 of the embodiment, the stator core is formed by alternately laminating two types of stator materials 22 and 32 having different outer shapes so that the punched end faces are not aligned. May be stacked by changing the type of the adjacent stator material to form a stator core. Alternatively, the punched end faces may not be aligned by alternately laminating one type of stator material on different circle centers.

In the stator core 20 of the embodiment, the stator materials 22 and 32 are formed and laminated so that the outer peripheral surface and inner peripheral surface of the stator core and all the punched end surfaces of the teeth are not aligned, but the outer peripheral surface and inner peripheral surface of the stator core are formed. The punched end faces of the surfaces may be aligned, but two or more types of stator materials may be formed and laminated so that the punched end faces of the teeth portion where eddy current is most likely to occur and the efficiency is affected are not aligned. In this case, the teeth of each stator material may be substantially similar in shape.

The embodiments of the present invention have been described with reference to the embodiments. However, the present invention is not limited to the embodiments, and various embodiments may be made without departing from the scope of the present invention. Of course, it can be carried out.

[Brief description of the drawings]

FIG. 1 is a partial enlarged view schematically illustrating a tooth portion of a stator core 20 of a rotary electric machine according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating, by comparison, teeth portions 24 and 34 of two stator materials 22 and 32 constituting the stator core 20 of the embodiment.

FIG. 3 is a manufacturing process diagram illustrating a state of manufacturing the stator core 20 of the embodiment.

[Explanation of symbols]

20 stator core, 22 first stator material, 24,
34 teeth part, 32 second stator material.

Continued on the front page (72) Inventor Yasuki Kawabata 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Tetsuya Miura 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F-term (reference 5H002 AA03 AA09 AB01 AC02 5H615 AA01 BB14 PP01 PP06 SS03 SS05 SS13 SS16 TT04

Claims (7)

[Claims] 1. A stator core for a rotating electrical machine comprising a plurality of stator materials formed by punching a steel plate having both surfaces coated with an insulating material, wherein the stator core is formed by punching an adjacent stator material when laminated. The stator cores are laminated so as to be at different positions. 2. The stator core according to claim 1, wherein the stator material is laminated such that at least a punched end surface of the stator material corresponding to a tip end surface of the salient pole portion of the stator core is located at a different position. 3. At least two of different shapes.
2. The stator core according to claim 1, wherein the types of stator materials are laminated such that adjacent stator materials are of different types. 4. The stator core according to claim 3, wherein the at least two types of stator materials have different shapes at least at portions corresponding to salient pole portions of the stator core. 5. The stator core according to claim 4, wherein a portion corresponding to the salient pole portion is formed by alternately stacking two types of stator materials having substantially similar shapes and different sizes. 6. A method for manufacturing a stator core of a rotating electrical machine, comprising forming at least two types of stator materials having punched end surfaces at different positions when punching and laminating steel plates coated on both sides with an insulating material. A method for manufacturing a stator core, comprising: a material forming step; and a laminating step of laminating the formed at least two types of stator materials such that adjacent stator materials are of different types. 7. The method for manufacturing a stator core of a rotating electric machine according to claim 6, wherein in the stator material forming step, at least a portion corresponding to a salient pole portion of the stator core has substantially similar shapes and different sizes. A method of manufacturing a stator core, wherein the laminating step is a step of alternately laminating the two types of stator members.