JP5421180B2 - Stator for rotating electrical machine and method for manufacturing the same - Google Patents

Description

  The present invention relates to a stator for a rotating electrical machine composed of a split laminated core and a method for manufacturing the same.

Conventionally, as a laminated iron core of a rotating electrical machine, there is a laminated iron core as shown in Patent Document 1. In the method of manufacturing a laminated core disclosed herein, when punching a core sheet having a predetermined shape from an electromagnetic steel sheet, the upper and lower surfaces of the core sheet that are finally removed (temporary caulking portion) are removed. Provide irregularities for temporary caulking. And at the time of lamination | stacking of a core sheet, the core sheets laminated | stacked up and down are temporarily fixed, and after fixing a lamination | stacking iron core permanently, a temporary crimping part is punched out.
Further, a technique of applying a winding by electrodeposition coating on a tooth portion of a laminated iron core as shown in Patent Document 2 is used.

JP-A-6-165447 (P5, FIG. 3) JP 2001-231191 (P4, paragraph 0023)

An insulating bobbin is attached to the teeth portion around which the coil of the laminated iron core is wound to ensure insulation from the coil, or an insulating layer is formed by electrodeposition coating. Electrodeposition coating is more suitable for improving the coil space factor than installing a bobbin. However, if only the coil winding part of the laminated core is to be electrodeposited, the shrinkage of the electrodeposition coating will be cured. There was a problem that the laminated iron core sometimes deformed.
This deformation occurs because it is necessary to mask the outer peripheral surface and inner peripheral surface of the laminated core so as not to paint, and the force of curing shrinkage acts on the laminated core unevenly.
In the case of the laminated iron core shown in FIG. 5 of Patent Document 1, when the coating film is cured, the teeth portion contracts in the laminating direction in FIG. As a result, on the outer peripheral side and inner peripheral side of each core piece constituting the iron core, stress acts in the direction of opening up and down. In the case of a rotor core as in Patent Document 1, in a conventional manufacturing process, it can be temporarily fixed by providing irregularities in a portion that is punched and finally discarded. This temporary fixation can be a resistance against cure shrinkage of the electrodeposition coating film. However, when electrodeposition coating is applied to the iron core of the stator, there is no suitable part that can be temporarily fixed in the conventional manufacturing process, and deformation due to curing shrinkage of the electrodeposition coating film cannot be effectively prevented. there were.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a stator for a rotating electrical machine that is not affected by hardening shrinkage of an electrodeposition coating as much as possible, and a method for manufacturing the same.

A stator of a rotating electrical machine according to the present invention is a stator of a rotating electrical machine in which a plurality of core pieces are laminated and electrodeposited on a divided laminated core and wound with a coil, and the divided laminated core is connected and fixed in a plurality of rings. ,
The core piece is connected to a temporary caulking portion that fixes the core pieces adjacent to each other vertically through a bridge portion that protrudes outward from the center of the outer peripheral portion of the back yoke portion,
The electrodeposition coating is characterized in that it is applied to the wall surface of the teeth portion, the coil side of the shoe, the inner peripheral surface of the back yoke portion, and the temporary caulking portion.

Further, the method for manufacturing a stator of a rotating electrical machine according to the present invention includes a laminating process for laminating a plurality of core pieces to form a divided laminated core, and an electrodeposition coating process for electrodeposition coating the divided laminated core,
A winding process in which a coil is wound around a plurality of divided laminated cores that have been electrodeposited;
A stator manufacturing method for a rotating electrical machine having
The stacking step fixes the temporary crimping portion connected via the bridge portion protruding outward from the center of the outer periphery of the back yoke portion of the core piece to the temporary crimping portion connected to the upper and lower adjacent core pieces,
The electrodeposition coating process uses the temporary crimping part as the electrode connection part,
Electrodeposition coating is applied to the teeth wall surface, the coil side of the shoe, the inner peripheral surface of the back yoke, and the laminated temporary crimping portion.

The stator of the rotating electrical machine according to the present invention is a temporary caulking portion in which core pieces constituting the stator fix the upper and lower adjacent core pieces to each other via a bridge portion protruding outward from the center of the outer peripheral portion of the back yoke portion. Connected to
Since the electrodeposition coating is applied to the teeth wall surface, the coil side of the shoe, the inner peripheral surface of the back yoke, and the temporary crimping portion, the shrinkage of curing that occurs when the electrodeposition coating film on the teeth is cured. A balance can be taken to prevent deformation of the stator.

Moreover, in the method for manufacturing a stator for a rotating electrical machine according to the present invention,
The stacking step fixes the temporary crimping portion connected via the bridge portion protruding outward from the center of the outer periphery of the back yoke portion of the core piece to the temporary crimping portion connected to the upper and lower adjacent core pieces,
The electrodeposition coating process uses the temporary crimping part as the electrode connection part,
Since it is characterized by electrodeposition coating on the teeth wall surface, the coil side of the shoe, the inner peripheral surface of the back yoke, and the laminated temporary crimping portion, there is no need to connect electrodes to the divided laminated core itself. . Thereby, since a stress is not applied to a specific division | segmentation laminated | stacked core, the deformation | transformation by hardening shrinkage | contraction of an electrodeposition coating film can be prevented, and a stator can be manufactured accurately.

It is a perspective view which shows the core sheet which comprises the stator of the rotary electric machine which concerns on this invention in Embodiment 1. FIG. FIG. 3 is an enlarged perspective view of a main part of a core sheet in the first embodiment. It is the perspective view which looked at FIG. 3 from the back surface. FIG. 4 is a perspective view and a perspective sectional view showing a stacking order of core sheets in the first embodiment. It is a perspective view which shows the state which temporarily fixed the core sheet | seat in Embodiment 1. FIG. It is a figure which shows the laminated core after the electrodeposition coating of the stator of the rotary electric machine which concerns on this invention in Embodiment 1. FIG. It is a perspective view which shows the state which wound the coil around the stator of the rotary electric machine which concerns on this invention in Embodiment 1, and was shaped cyclically | annularly. It is a top view which shows the state which carried out the mold process of the stator of the rotary electric machine shown in FIG.

Embodiment 1 FIG.
Embodiment 1 A stator of a rotating electrical machine according to the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing core sheets 1a and 1b constituting a stator of a rotating electrical machine.
The core sheets 1a and 1b are integrally formed from a thin steel plate by an etching process. The outer peripheral side end portion of the back yoke portion 13 of the core piece 11 constituting the core sheets 1a and 1b is left thin during the etching process. All the core pieces 11 are connected by sharing this thin portion with the adjacent core pieces 11.
The core sheet 1a and the core sheet 1b are alternately stacked to constitute the stator. Details including the difference between the core sheet 1a and the core sheet 1b will be described below.

Fig.2 (a) is a principal part enlarged view of the core sheet 1a. FIG.2 (b) is a principal part enlarged view of the core sheet 1b. 3A is a diagram of FIG. 2A viewed from the back surface, and FIG. 3B is a diagram of FIG. 2B viewed from the back surface.
As shown in FIG. 2A, a bridge portion 14 that protrudes outward is provided at the center of the outer peripheral side of the back yoke portion 13 of the core piece 11. The core piece 11 is connected to the temporary crimping portion 15a via the bridge portion 14. The temporary caulking portion 15a includes a frame 151a, a male caulking portion 152a supported by the frame in a cantilever manner, and a slit 153a serving as a female caulking portion. As shown in FIG. 3A as viewed from the back side, at the time of the etching process, the leaf spring-like convex portions 154a are left on both sides in the longitudinal direction of the slit 153a by the half thickness of the core sheets 1a and 1b. is there.

  As shown in FIG. 2A and FIG. 2B, in the core sheet 1a and the core sheet 1b, the positions of the male caulking portion and the female caulking portion are reversed left and right. In the laminating process described next, the core sheet is laminated while fitting this portion up and down.

  FIG. 4A is a diagram showing a laminating process for laminating core sheets 1a and 1b while temporarily crimping, and a perspective sectional view thereof. FIG. 4B is a view showing a state after lamination and a cross-sectional view thereof. In the laminating step, two types of core sheets 1a and 1b are alternately stacked. Each time the core sheets 1a and 1b are stacked, the male caulking portions 152a and 152b are pressed downward from above to fit with the slits 153a and 153b which are the female caulking portions immediately below. Since the slits 153a and 153b are provided with the leaf spring-like convex portions 154a and 154b on both sides in the longitudinal direction as described above, the male caulking portions 152a and 152b press-fitted into the slits 153a and 153b are provided with the convex portions 154a, The core piece 11 is pressed in the horizontal direction by 154b. And the fitting state of the upper and lower temporary crimping portions 15a, 15b is stably held by this pressing force. When all the core sheets 1a and 1b are laminated and fitted, a divided laminated core group structure 100 in which the divided laminated cores 2 shown in FIG. 5 are connected is completed.

Next, the electrodeposition coating process will be described. FIG. 6 is a perspective view showing the divided laminated core group structure 100 after painting. Electrodeposition coating is performed to ensure insulation between the teeth portion of the stator and the coil 6 wound around the teeth portion. Before applying electrodeposition coating, a masking process is performed on a portion that does not need to be painted and a portion where inconvenience occurs when painting.
Here, the outer peripheral surface of the back yoke 13, the inner peripheral surface of the teeth, the inner portion of the thin portion, the portion where the adjacent core pieces 11 are bent and contacted, and both ends of the divided laminated core group structure 100 are masked. Here, the temporary crimping portions 15a and 15b are not masked.

The electrode at the time of electrodeposition coating may be attached by grasping the temporary crimping portions laminated at both ends from above and below.
Thereby, the stress applied to the core piece 11 can be prevented, and at the same time, the coupled state of the temporary crimping portions 15a and 15b can be stably maintained.

When the electrodeposition coating film is formed on the portion of the divided laminated core group structure 100 that has not been masked, the electrodeposition coating film is dried for a predetermined time in order to cure the electrodeposition coating film. At this time, the force that contracts the coating film mainly in the laminating direction is concentrated on the teeth portion of each divided laminated core 2 that has been subjected to electrodeposition coating. Then, since the outer peripheral surface of the back yoke portion 13 is not coated, the back yoke portion 13 is subjected to a stress that opens upward and downward in the stacking direction.
However, according to this embodiment, the temporary crimping parts 15a and 15b connected to the back yoke part 13 of the core piece 11 via the bridge part 14 are fitted to each other vertically. In addition, since the temporary crimping portions 15a and 15b are also electrodeposited, curing shrinkage occurs in these portions in the stacking direction. Although the lateral width of the bridge portion 14 is narrow, the back yoke portion 13 generated by the cure shrinkage force of the teeth portion is combined with the fitting force of the temporary crimping portions 15a and 15b and the previous cure shrinkage force, and the stacking vertical direction is opened. It can resist the stress.

  When the electrodeposition coating film dries, it moves to the next winding process. In the winding process, first, a predetermined coil 6 is wound around the teeth. A coating film is formed on the inner peripheral surface of the back yoke portion of the split laminated core 2, the wall surface of the teeth portion, and the side wall surface of the coil 6 of the shoe. Since the tooth portion is already fixed by this coating film, the coil 6 can be wound with high accuracy.

When the winding is finished, the divided laminated core group structure 100 is molded as shown in FIG. 7 along a mandrel (not shown) whose outer periphery is a perfect circle to obtain the stator 101.
When this is further put into a mold (not shown) and the outer peripheral portion is molded with resin, the molded stator 102 shown in FIG. 8 is completed.

The stator of the rotating electrical machine according to the first embodiment of the present invention has a temporary crimping portion 15a in which the core sheets 1a and 1b that are stacked one above the other through the bridge portion 14 protruding from the center on the outer peripheral side of the back yoke 13 are temporarily crimped and fitted. 15b, and this portion is also electrodeposited, so that the deformation of the stator can be prevented against the stress generated when the electrodeposition coating film on the teeth portion is cured.
As a result, it is possible to provide an efficient stator for a rotating electrical machine having excellent magnetic characteristics.
Moreover, since temporary crimping parts 15a and 15b should just be provided only in the core piece 11 which comprises a predetermined | prescribed division | segmentation laminated | stacked core, the misload in a lamination process can be reduced.

  The stator manufacturing method for a rotating electrical machine according to Embodiment 1 of the present invention uses the laminated temporary crimping portions 15a and 15b as electrode gripping portions at the time of electrodeposition coating. Therefore, it is necessary to connect electrodes to the divided laminated core 2 itself. There is no. As a result, no stress is applied to the specific divided laminated core 2, so that the stator can be manufactured with high accuracy by preventing deformation due to curing shrinkage of the electrodeposition coating film.

  In addition, when attaching the electrodes during electrodeposition coating to the temporary crimping portions 15a and 15b, the gripping force from the upper and lower sides in the laminating direction ensures resistance to the stress at the time of hardening shrinkage of the electrodeposition coating film. can do.

  Moreover, since the etching process can be used for molding the core sheets 1a and 1b, even a stator for a small motor can be manufactured with high accuracy.

  Further, by molding the outer peripheral surface of the stator, it is not necessary to cut the stacked temporary crimping portions, and the temporary crimping portions can be surrounded and molded, so that a highly rigid stator can be manufactured.

  In Embodiment 1, although the example which uses the core sheet | seat 1a, 1b to which all the one-layer core pieces 11 used for a stator were connected was shown, even if it combines later, using the core sheet | seat divided | segmented equally good. Further, after the divided laminated cores are laminated and coated, the stator may be assembled after winding the coils individually.

  Moreover, in this embodiment, although the core sheets 1a and 1b were formed from the steel plate by etching, they may be punched out by pressing.

1a, 1b Core sheet, 11 core pieces, 13 Back yoke part, 14 Bridge part, 15a, 15b Temporary caulking part, 151a Frame, 152a, 152b Male caulking part, 153a, 153b Slit, 154a, 154b Convex part, Divided lamination core,
6 coils, 100-divided laminated core group structure, 101 stator,
102 Molded stator.

Claims (10)

In a stator of a rotating electrical machine in which a plurality of core pieces are laminated and electrodeposited on a divided laminated core and wound with a coil, and the divided laminated core is connected and fixed in a plurality of rings,
The core piece is connected to a temporary caulking portion that fixes the core pieces adjacent to each other vertically through a bridge portion that protrudes outward from the outer peripheral center of the back yoke portion,
The stator for a rotating electrical machine, wherein the electrodeposition coating is applied to a tooth portion wall surface, the coil side of the shoe, a back yoke portion inner peripheral surface, and the temporary caulking portion. A plurality of core pieces used for the same lamination are connected by thin portions provided at both ends of the outer periphery of the back yoke portion, and the temporary caulking portion is provided only on a core piece constituting a predetermined divided laminated core. The stator for a rotating electrical machine according to claim 1, wherein the stator is a rotating electrical machine. The stator of a rotating electrical machine according to claim 1, wherein the temporary crimping portion has irregularities for fitting the temporary crimping portions adjacent to each other vertically. The stator of a rotating electrical machine according to any one of claims 1 to 3, wherein the core piece and the temporary caulking portion are formed by etching. 5. The stator for a rotating electrical machine according to claim 1, wherein outer peripheral surfaces of the plurality of divided laminated cores formed in an annular shape are fixed by molding. A lamination step of laminating a plurality of core pieces to form a divided laminated core, and an electrodeposition coating step of electrodeposition coating the divided laminated core;
A winding step of winding a coil around the plurality of divided laminated cores that have been electrodeposited;
A stator manufacturing method for a rotating electrical machine having
In the laminating step, the temporary caulking portion connected via the bridge portion protruding outward from the center of the outer periphery of the back yoke portion of the core piece is fixed to the temporary caulking portion connected to the upper and lower adjacent core pieces. And
The electrodeposition coating process uses the temporary caulking portion as an electrode connection portion,
A method of manufacturing a stator for a rotating electrical machine, wherein electrodeposition coating is applied to a tooth portion wall surface, a coil side of a shoe, a back yoke portion inner peripheral surface, and the laminated temporary caulking portion. A plurality of core pieces used for the same lamination are connected by thin portions provided at both ends of the outer periphery of the back yoke portion, and the temporary caulking portion is provided only on a core piece constituting a predetermined divided laminated core. The method of manufacturing a stator for a rotating electrical machine according to claim 6. The method of manufacturing a stator for a rotating electric machine according to claim 7, wherein the electrodes are connected in the coating step by gripping the stacked temporary crimping portions in the stacking direction. The rotation according to any one of claims 6 to 8, further comprising an etching step of forming the core piece and the temporary caulking portion connected via the bridge portion by etching from a steel plate. A method for manufacturing an electric stator. The method for manufacturing a stator for a rotating electrical machine according to any one of claims 6 to 9, further comprising a molding step of molding and fixing outer peripheral surfaces of a plurality of divided laminated cores formed in an annular shape.

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