JP2002010540A - Stator for dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for dynamo-electric machine capable of inhibiting magnetic reluctance from increasing, and reducing production cost by improving yield and reducing the number of processes. SOLUTION: The stator 11 is formed by fitting an outer core 13 to the outside of an inner core 12. Each of cores 12, 13 has a laminated structure formed out of a plurality of inner core sheets and outer core sheets. A projecting part 16 is formed so as to project in a radial direction on the inner periphery of the outer core 13 and recessed parts 17 are formed on both sides in the circumferential direction of the projecting part 16. A recessed part 18 fitting to the projecting part 16 is formed on the inner core 12, and projecting parts 19 fitting to the recessed part 17 on the outer core 13 are formed on both sides in the circumferential direction of the recessed part 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a rotating electric machine, and more particularly to a stator for a rotating electric machine including separate inner cores and outer cores.

[0002]

2. Description of the Related Art Conventionally, for example, a stator 51 as shown in FIG. 4 has been known. The stator 51 is formed by separately fitting an inner core 52 and an outer core 53 by fitting. In the inner core 52,
A plurality of toothed core portions 55 are provided on the outer peripheral side of a substantially cylindrical bridge portion 54 in which a rotor (not shown) is provided so as to radially protrude. At the tip end side of the tooth-shaped iron core portion 55, a connecting piece 56 serving as a connecting portion with the outer core 53 extends in the circumferential direction. The connection piece 56 extending in the circumferential direction ensures a large contact area between the inner core 52 and the outer core 53, and suppresses an increase in magnetic resistance between the cores 52, 53. The outer core 53 is fitted and fixed to the outside of the inner core 52 so that the inner peripheral surface of the outer core 53 and the outer peripheral surface of the coupling piece 56 are brought into close contact by press-fitting. In addition, in this figure, the winding wound around the toothed iron core 55 is not shown for convenience.

[0003] The inner core 52 and the outer core 53 are formed by laminating sheet-shaped parts of the same shape punched from a sheet material. In addition, the sheet-shaped component forming the inner core 52 and the sheet-shaped component forming the outer core 53 are punched from different sheet materials in different processes. Thereby, both cores 52, 5
For example, the shape of the two sheet-shaped components constituting the outer core 53 can be formed such that the outer diameter of the inner core 52 is larger than the inner diameter of the outer core 53 so that the inner core 52 can be pressed into the outer core 53. In addition, both cores 5
It becomes possible to increase the fitting accuracy of 2, 53. By improving the press-fitting and the fitting accuracy, it is possible to suppress an increase in magnetic resistance between the cores 52 and 53 and to improve the mechanical coupling strength between the cores 52 and 53.

[0004] However, in the above-described manufacturing method in which the sheet-like parts constituting the inner core 52 and the sheet-like parts constituting the outer core 53 are punched out of another sheet material in a separate step, as described above. There is a problem that the amount of waste is large, the yield is poor, and the number of processes increases.

In order to solve this problem, for example, there has been proposed a method of simultaneously punching the same sheet material so that the sheet-like parts constituting the inner core are arranged inside the sheet-like parts constituting the outer core. ing.
However, this method has a problem that a slight gap is formed between the two sheet-shaped parts for processing reasons, and the fitting accuracy of the two cores is reduced.

As a configuration for solving these problems (reduction of fitting accuracy, reduction of yield and increase of processes), Japanese Patent Laid-Open No. Hei 8
-126231. In this configuration, simultaneous punching is performed in a state where a sheet-like component constituting the inner core (hereinafter, referred to as an inner core sheet) is arranged inside a sheet-like component constituting the outer core (hereinafter, referred to as an outer core sheet). I have. And, the convex portion formed on the inner core sheet,
The outer core sheet is press-fitted into a concave portion formed separately from a concave portion formed at a portion where the convex portion is punched out and smaller than the convex portion. In addition, in addition to the above-described configuration, in the publication, a concave portion formed in the inner core sheet is formed separately from a convex portion formed in a portion where the concave portion is punched out in the outer core sheet.
There is also disclosed a configuration in which a protrusion larger than the recess is press-fitted. With these configurations, the fitting accuracy between the inner core and the outer core is improved, and the reduction in the yield and the increase in the number of steps are prevented.

[0007]

However, according to the structure disclosed in the above publication, the outer core sheet includes:
The concave portion (or convex portion) formed at a portion where the convex portion (or concave portion) of the inner core sheet is punched;
Both the protrusions (or recesses) of the inner core sheet and the recesses (or protrusions) to be fitted are formed. That is, the size of the protrusion and the recess for fitting the inner core and the outer core is limited, and the contact area between the two cores in the fitted state is relatively small. This decrease in the contact area causes an increase in the magnetic resistance between the two cores.

An object of the present invention is to provide a stator of a rotating electric machine which can suppress an increase in magnetic resistance and can reduce a manufacturing cost by improving a yield and reducing steps.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a method in which a plurality of radially protruding radially outwardly of a substantially cylindrical bridge portion in which a rotor is provided. An inner core provided with a toothed core portion, a winding wound around the toothed core portion, and a substantially cylindrical outer core fitted and fixed to the outside of the inner core. The inner core sheet and the outer core sheet have a laminated structure, and both core sheets are punched out of the same sheet material so that the stator of the rotating electrical machine radially projects on the inner peripheral side of the outer core sheet. A convex portion is formed and concave portions are formed on both sides in the circumferential direction of the convex portion, and a concave portion that fits into the convex portion is formed at a tip end of the tooth-shaped core portion of the inner core sheet. And summarized in that the formation of the convex portion to be fitted into the recess of the outer core sheets on both sides in the circumferential direction of the Rutotomoni recess.

According to a second aspect of the present invention, there is provided an inner core provided with a plurality of tooth-shaped core portions radially protruding from an outer peripheral side of a substantially cylindrical bridge portion in which a rotor is provided, and the tooth-shaped core. And a substantially cylindrical outer core fitted and fixed to the outside of the inner core, the inner core and the outer core each having a laminated structure of a plurality of inner core sheets and outer core sheets. ,
In a stator of a rotating electrical machine in which both core sheets are punched and formed from the same sheet material, a convex portion is formed so as to protrude in a radial direction at a distal end portion of the tooth-shaped core portion of the inner core sheet, and a periphery of the convex portion is formed. A concave portion is formed on both sides in the direction, and a concave portion is formed on the inner peripheral side of the outer core sheet so as to be fitted to the convex portion, and a convex portion fitted on the both sides in the circumferential direction of the concave portion is formed in the inner core sheet. It is the gist that was formed.

According to the first and second aspects of the present invention, the contact area between the inner core and the outer core can be increased by the projections and the depressions formed on both core sheets. By increasing the contact area, it is possible to suppress an increase in magnetic resistance between the two cores. Further, at the time of processing both core sheets, the inner portion of the outer core sheet of the sheet material is effectively utilized, and waste of the material (the sheet material) is reduced, and the yield is improved. In addition, compared to forming the inner core sheet and the outer core sheet in different steps, the number of steps can be reduced by simultaneously punching the same sheet material.

According to a third aspect of the present invention, in the stator of the rotary electric machine according to the first or second aspect, the outer core lamination caulking protrusion is formed on a convex portion of the outer core sheet. I do.

According to the present invention, by forming the outer core lamination caulking projection on the convex portion of the outer core sheet having a relatively large width in the radial direction, other portions (for example, portions between the convex portions) are formed. The width does not need to be widened to provide the caulking protrusion. That is, by forming the caulking projections on the convex portions, it is easy to reduce the diameter of the outer core sheet and, consequently, the size of the stator. Further, since the convex portion has a lower magnetic flux density than a portion between the convex portions, when the caulking projection is provided on the convex portion,
The adverse effect of the caulking projection on the magnetic flow of the outer core is reduced as compared with the case where the caulking projection is provided between the convex portions.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
3 will be described with reference to FIG. As shown in FIG. 1, a stator (hereinafter, simply referred to as a “stator”) 11 of the rotating electric machine includes an inner core 12 and an outer core 13. In addition,
FIG. 1 shows a state where the stator 11 is viewed in the axial direction. The inner core 12 includes a substantially cylindrical bridge portion 14 in which a rotor (not shown) is provided. On the outer peripheral side of the bridging portion 14, a plurality (9 in this embodiment)
) Are formed. A winding (not shown) is wound around each tooth-shaped core 15. Outer core 1
3 has a substantially cylindrical shape and is fitted and fixed to the outside of the inner core 12.

On the inner peripheral side of the outer core 13, a plurality (nine in this embodiment) of convex portions 16 are formed so as to protrude in the radial direction, and concave portions 17 are formed on both sides of the convex portion 16 in the circumferential direction. Are formed. In addition, a concave portion 18 is formed at the tip of the toothed core portion 15 of the inner core 12, and convex portions 19 are formed on both sides in the circumferential direction of the concave portion 18. In a single state of the inner core 12 and the outer core 13 before they are fitted, each of the concave portions 17, 18 is formed to have a similar shape smaller than each of the convex portions 19, 16. The convex portion 16 of the outer core 13 is provided in the concave portion 18 on the inner core 12 side, and the concave portion 1 on the outer core 13 side.
The inner core 12 and the outer core 13 are connected to each other by press-fitting the convex portion 19 on the inner core 12 side into the base 7.

Each of the inner core 12 and the outer core 13 has a plurality of identically shaped inner core sheets 2 to be described later.
2 and the outer core sheet 23. FIG. 2 shows an arrangement state of the core sheets 22 and 23 constituting the cores 12 and 13 at the time of punching. As shown in this figure, the inner core sheet 22 includes:
A bridging portion 24, a toothed core portion 25, a concave portion 28, and a convex portion 29 are formed so as to correspond to the inner core 12. The outer core sheet 23 has a convex portion 26 and a concave portion 27 corresponding to the outer core 13.
The inner core sheet 22 is arranged inside the outer core sheet 23 and is simultaneously punched from the same sheet material as the inner core sheet 22 by a press machine or the like. Concave and convex portions 28 of the inner core sheet 22;
Reference numeral 29 denotes a convex portion and a concave portion 26, 2 of the outer core sheet 23.
7 and the adjacent convex portions 2 of the outer core sheet 23
6 are opposed to each other.

On the convex portion 26 of the outer core sheet 23, a crimping projection 30 is formed by stamping (half-punching) so as to protrude in the laminating direction. Outer core sheet 2
At the time of lamination of No. 3, the caulking projections 30 are caulked and fixed to the adjacent outer core sheet 23, whereby the plurality of outer core sheets 23 are combined in a laminating manner, and the outer core 13 is formed.

Similarly, a caulking projection 31 is formed on the toothed iron core portion 25 of the inner core sheet 22. The caulking projection 31 couples the plurality of inner core sheets 22 in a laminated manner, and the inner core 12 is formed. It is formed.

FIG. 3 shows a comparison between a stator in which the inner core sheet and the outer core sheet are punched out of different sheet materials in different processes and a stator in which both core sheets are punched out of the same sheet material at the same time. It is shown using measured values of work efficiency of a rotating electric machine using these stators. In the drawing, what is referred to as “separate press punching” is a type corresponding to the stator 51 in which both core sheets are stamped out of another sheet material in a separate step. “Simultaneous press punching A” refers to a toothed core of an inner core as disclosed in Japanese Patent Application Laid-Open No. 8-126231, of a type in which both core sheets are simultaneously punched from the same sheet material. In this configuration, only one convex portion provided on the outer core portion is fitted into a concave portion provided on the outer core side. Further, what is referred to as “simultaneous press punching B” is a type in which both core sheets are simultaneously punched from the same sheet material, and
In both cores, each of the cores has a convex portion and a concave portion. In this measurement, the power supplied to the rotating electric machine is set such that the difference in the work efficiency between the types reflects the difference in the magnetoresistance (the magnetoresistance between the inner core and the outer core) between the types. The conditions such as the voltage are kept constant for each type.

As shown in FIG. 3, the separate press punching type has a large contact area between the inner core and the outer core, and exhibits high work efficiency. Since the simultaneous press punching type A has a small contact area between both cores, the work efficiency is lower than that of the separate press punching type. On the other hand, the simultaneous press punching B type has a large contact area between both cores due to the convex and concave portions formed on both the inner core and the outer core, and has a work efficiency comparable to the separate press punching type. This result proves that the magnetic resistance between the inner core and the outer core is kept low in the simultaneous punching press B type stator corresponding to the stator 11 of the present embodiment.

In this embodiment, the following effects can be obtained. (1) The inner core sheet 22 is replaced with the outer core sheet 23
And both core sheets 22 and 23
Was formed by simultaneous punching from the same sheet material. As a result, the inside portion of the outer core sheet 23 of the sheet material is effectively used, the waste of the material (the sheet material) is reduced, and the yield is improved. Also,
Compared to forming the inner core sheet 22 and the outer core sheet 23 in different steps, the number of steps can be reduced. Will be possible. Therefore, the productivity can be improved and the cost can be reduced.

(2) The outer core 13 is provided with the convex portions 16 and the concave portions 17, and the inner core 12 is provided with the concave portions 18 and the convex portions 19, and the respective convex portions 16 and 19 are fitted into the respective concave portions 18 and 17. . Thereby, Japanese Patent Application Laid-Open No. 8-126
No. 231 discloses a contact area between the inner core and the outer core as compared with a configuration in which only one convex portion provided on each tooth core portion of the inner core is fitted into a concave portion provided on the outer core side. Can be expanded. By increasing the contact area, it is possible to suppress an increase in magnetic resistance between the two cores.

(3) At the time of punching of both core sheets 22 and 23, the concave portions and convex portions 28 and 29 of the inner core sheet 22 should not face the convex portions and concave portions 26 and 27 of the outer core sheet 23. did. As a result, the convex portions 26 and 29 can be formed larger than the concave portions 28 and 27, respectively. Thus, when the inner core 12 and the outer core 13 are connected, the convex portions 16 and 19 can be pressed into the concave portions 18 and 17, respectively. In addition, both cores 12, 13
Can be improved in fitting accuracy. Therefore, it is possible to suppress an increase in magnetic resistance between the cores 12 and 13 and to improve the mechanical coupling strength between the cores 12 and 13.

(4) The convex portion 26 of the outer core sheet 23
Then, a crimping projection 30 for laminating and bonding the outer core sheet 23 was formed. If the caulking projections 30 are to be provided at portions other than the protruding portions 26, for example, between the protruding portions 26, the portion between the protruding portions 26 has a width (radial direction) sufficient to form the caulking projections 30. Width). This makes it difficult to reduce the diameter of the outer core sheet 23 and, consequently, to reduce the size of the stator 11. That is, by forming the caulking protrusion 30 on the convex portion 26, the diameter of the outer core sheet 23 can be easily reduced.

Since the magnetic flux density of the portion between the convex portions 26, that is, the portion between the convex portions 16 of the outer core 13 is higher than that of the convex portions 16, the portion between the convex portions 16 is large. In addition, the formation of the caulking projection 30 in which the magnetic disturbance is likely to occur may cause the magnetic flow of the outer core 13 to deteriorate. That is, by forming the caulking protrusion 30 on the convex portion 26, it is possible to suppress the deterioration of the magnetic flow of the outer core 13 and thus the stator 11.

The embodiment is not limited to the above, and may be, for example, in the following mode. ○ At the tip of the toothed core portion of the inner core sheet, a convex portion is formed so as to protrude in the radial direction, and concave portions are formed on both sides in the circumferential direction of the convex portion, and the convex portion is formed on the inner peripheral side of the outer core sheet. A concave portion may be formed to fit into the portion, and a convex portion may be formed on both sides in the circumferential direction of the concave portion to fit into the concave portion of the inner core sheet. Also in this case, the contact area between the inner core and the outer core can be increased. By increasing the contact area, it is possible to suppress an increase in magnetic resistance between the two cores. Further, since the number of protrusions of the outer core sheet increases, the number of caulking protrusions for lamination of the outer core sheet can be increased.

The caulking projection 30 may be provided at a portion between the convex portions 26. It is not necessary to provide the protrusion 26. ○ The swaging protrusion 30 may not be formed. In this case, the outer core sheet 23 may be laminated and connected by welding or the like.

Next, technical ideas other than the inventions described in the claims that can be grasped from the embodiment will be described below together with their effects. (1) In the invention according to claim 1, the inner core sheet is formed by being punched simultaneously with the outer core sheet so as to be arranged inside the outer core sheet, and the inner core sheet is formed by punching. Are arranged so as to face an intermediate portion between the adjacent convex portions of the outer core sheet.
In this case, the fitting accuracy between the inner core and the outer core can be improved, and the two cores can be connected by press-fitting.

(2) In the invention described in claim 2,
The inner core sheet is punched and formed at the same time as the outer core sheet so as to be disposed inside the outer core sheet, and at the time of the punching formation, the protrusions and the recesses of the inner core sheet are formed by the outer core sheet. The sheet is arranged so as to face an intermediate portion between the adjacent concave portions of the sheet. In this case, the fitting accuracy between the inner core and the outer core can be improved, and the two cores can be connected by press-fitting.

[0030]

As described above in detail, according to the first to third aspects of the present invention, in the stator of the rotating electric machine, the increase in the magnetic resistance is suppressed, and the manufacturing cost is improved by improving the yield and reducing the number of steps. Can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing an outline of a stator according to an embodiment.

FIG. 2 is a front view showing an outline of an inner core sheet and an outer core sheet during processing.

FIG. 3 is a graph showing a relationship between a method of processing a stator and work efficiency of a rotating electric machine.

FIG. 4 is a front view showing an outline of a stator according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Stator, 12 ... Inner core, 13 ... Outer core, 14 ... Bridge part, 15 ... Toothed iron core part, 22 ... Inner core sheet, 23 ... Outer core sheet, 26 ... (23)
Convex, 27 ... concave (of 23), 28 ... concave (of 22),
29 ... (22) convex part, 30 ... caulking projection.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kazuyuki Hashimoto 390 Umeda, Kosai-shi, Shizuoka Prefecture Asmo Co., Ltd. (72) Inventor Kazuo 390 Umeda, Kosai-shi, Shizuoka Prefecture Asmo Co., Ltd. F-term (reference) 5H002 AA06 AA07 AB01 AC01 AC08 AE06 AE07 AE08 5H615 AA01 BB01 BB07 BB14 BB16 PP01 PP06 SS03 SS05 SS08 SS19 SS44 TT04

Claims (3)

[Claims] 1. An inner core having a plurality of toothed cores radially protruding from an outer peripheral side of a substantially cylindrical bridge portion in which a rotor is provided, and a winding wound around the toothed cores. And a substantially cylindrical outer core fitted and fixed to the outside of the inner core, wherein the inner core and the outer core have a laminated structure of a plurality of inner core sheets and outer core sheets, respectively, and both core sheets are the same. In a stator of a rotary electric machine stamped and formed from a sheet material, a convex portion is formed so as to protrude in a radial direction on an inner peripheral side of the outer core sheet, and concave portions are formed on both sides in a circumferential direction of the convex portion. A concave portion that fits into the convex portion is formed at the distal end of the toothed core portion of the core sheet, and concave portions of the outer core sheet are formed on both sides in the circumferential direction of the concave portion. The stator of the rotating electric machine, characterized in that the formation of the convex portion to be fitted. 2. An inner core provided with a plurality of tooth-shaped core portions radially protruding from an outer peripheral side of a substantially cylindrical bridge portion in which a rotor is provided, and a winding wound around the tooth-shaped core portions. And a substantially cylindrical outer core fitted and fixed to the outside of the inner core, wherein the inner core and the outer core have a laminated structure of a plurality of inner core sheets and outer core sheets, respectively, and both core sheets are the same. In a stator of a rotating electric machine formed by punching a sheet material, a convex portion is formed so as to protrude in a radial direction at a distal end portion of the toothed core portion of the inner core sheet, and concave portions are formed on both sides in a circumferential direction of the convex portion. Forming a concave portion to be fitted to the convex portion on the inner peripheral side of the outer core sheet, and forming the inner core sheet on both sides in the circumferential direction of the concave portion. The stator of the rotating electric machine, characterized in that the formation of the convex portion to be fitted into the recess. 3. The rotating electric machine stator according to claim 1, wherein the outer core lamination caulking projection is formed on a convex portion of the outer core sheet.