JPH11234973A - Manufacture of slotless stator iron core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a slotless stator iron core which can form a layered iron core easily into an arbitrary shape with high yield of iron core material. SOLUTION: This manufacturing method of slotless stator iron core, which forms the slotless stator iron core 1 by layering thin-plate shaped iron cores, involves forming a strip continuous iron core 2 which consists of a fan-shaped iron core part 2a which has the same arc as an inner diameter and an outer diameter at the time of layering and is formed at an arbitrary angle with no 360 as its multiple between both end parts in a circumferential direction, and an iron core connection part 2b for connecting the iron core part 2a at an outer periphery part by means of press-punching to prevent the iron core connection part 2b from aligning linear in its axial direction, and spirally-layering the strip continuous iron core 2. It is thus possible to manufacture the stator iron core easily, and improve the yield of iron core raw material. The core connection parts do not aline linearly in the axial direction, thus it is possible to suppress generation of cogging torque.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a slotless stator core in which a thin iron core is laminated to form a slotless stator core.

[0002]

2. Description of the Related Art Conventionally, a slotless stator core has been manufactured as follows. (1) As shown in FIG. 4, a stator core 11 is manufactured by sequentially laminating a press-cut ring-shaped core 10. (2) As shown in FIG. 5, a straight band-shaped iron core 1 of arbitrary width
2 are spirally laminated while deforming the plate thickness to produce the stator core 13.

[0003]

However, in the former prior art, there is a problem that the yield of the iron core material is poor, and in the latter prior art, since the plate thickness on the inner diameter side and the outer diameter side are different, the lamination is difficult. There has been a problem that the iron core sometimes collapses and the inner diameter cannot be arbitrarily selected with respect to the width of the iron core. Therefore, an object of the present invention is to provide a method of manufacturing a slotless stator core that has a good yield of the core material, does not fall down, and can easily manufacture the stator core into an arbitrary shape. It is.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a method of manufacturing a slotless stator core in which a thin plate-shaped iron core is laminated to form a slotless stator core. A fan-shaped iron core having the same arc as the inner diameter and the outer diameter and formed at an arbitrary angle not having a multiple of 360 between both ends in the circumferential direction, and an iron core connecting the core at the outer circumference; The continuous iron core is formed by press punching, and the continuous iron cores are spirally laminated so that the iron core connecting portions are not arranged linearly in the axial direction. Therefore,
The stator core can be easily manufactured, and the yield of the core material is improved. Further, since the core connecting portions are not arranged linearly in the axial direction, the occurrence of cogging torque is suppressed.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of a belt-shaped core showing an embodiment of the present invention, FIG. 2 is a perspective view showing a state where a band-shaped continuous core is spirally laminated, and FIG. FIG. 5 is a view showing an inner peripheral surface of a stator core manufactured by the above method. In FIG. 1, reference numeral 1 denotes a stator core, which is configured by using a belt-shaped continuous core 2. The strip-shaped continuous iron core 2
Is a fan-shaped core portion 2a, and an iron core connecting portion 2 formed by cutting out the inner diameter side at both circumferential ends of the fan-shaped core portion 2a.
b. The inner diameter of the fan-shaped core portion 2a is:
It has the same arc as the inner diameter of the stator core at the time of lamination, and the outer diameter of the fan-shaped core portion 2b has the same arc as the outer diameter of the stator core at the time of lamination. Further, between the two ends in the circumferential direction of the fan-shaped core portion 2a is formed at an arbitrary angle not having a multiple of 360. The band-shaped continuous iron core 2 is formed by punching out a press, and as shown in FIG. 2, while bending the portion of the iron core connecting portion 2b to be spirally wound,
The stator core 1 is manufactured by laminating in a cylindrical shape. In manufacturing the stator core 1, the fan-shaped core portion 2 a is formed at an arbitrary angle that does not have a multiple of 360 between the circumferential ends of the fan-shaped core portion 2 a. When the iron cores 2 are stacked, the positions of the iron core connecting portions 2b are sequentially shifted in the circumferential direction. Therefore, the iron core connecting portions 2b are not arranged in a straight line in the axial direction, so that the occurrence of cogging torque can be suppressed.

[0006]

As described above, according to the present invention, the following effects can be obtained. (1) Since the stator core is manufactured by spirally laminating continuous belt-shaped cores, the yield of the core material is good. Further, since the thickness of the stator core does not change, the core does not fall down. (2) Since the belt-shaped continuous iron core is composed of the fan-shaped iron core portion and the iron core connecting portions formed at both ends in the circumferential direction of the fan-shaped iron core portion, the laminated iron core can be easily manufactured in any shape. Can be. (3) When the belt-shaped continuous iron cores are stacked spirally, the iron core connecting portions do not line up linearly in the axial direction, so that the occurrence of cogging torque can be suppressed.

[Brief description of the drawings]

FIG. 1 is a front view of a strip-shaped continuous iron core showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which strip-shaped continuous iron cores according to the embodiment of the present invention are spirally laminated.

FIG. 3 is a diagram illustrating an inner peripheral surface of a stator core manufactured by spirally stacking strip-shaped continuous cores according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a method for manufacturing a conventional slotless stator core.

FIG. 5 is a perspective view showing a method for manufacturing another conventional slotless stator core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator core, 2 Strip-shaped continuous core, 2a Fan-shaped core, 2b Core connection

Claims (1)

[Claims] 1. A method of manufacturing a slotless stator core comprising laminating thin plate-shaped iron cores to form a slotless stator core, comprising: A band-shaped continuous iron core consisting of a fan-shaped iron core formed at an arbitrary angle not having a multiple of 360 between both ends in the direction and an iron core connecting part connecting the iron core with an outer peripheral part is formed by press punching, A method for manufacturing a slotless stator core, wherein the strip-shaped continuous cores are helically laminated such that the core connection portions are not arranged linearly in the axial direction.