JP4291042B2 - Rotating electric machine and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in performance of a rotating electrical machine, and an object of the present invention is to improve deterioration of magnetic properties due to caulking for fixing core pieces of cores in which core pieces are laminated.
[0002]
[Prior art]
In general, a stator core of a rotating electrical machine is configured to insulate each core piece in the stacking direction by laminating core pieces made of a thin plate with an insulation coating on the surface for the purpose of suppressing heat loss due to eddy current. In this case, there is a problem that if the core pieces are separated during assembly, it is difficult to handle and the productivity is lowered. Therefore, the core pieces are fixed together by caulking and integrated to facilitate handling ( For example, see Patent Document 1).
[0003]
The caulking shape includes a V shape and a round shape. In any shape, a projection and a depression are formed in the plate pressure direction by plastic deformation, and the thin plates are fixed to each other by fitting the projection and the depression.
[0004]
[Patent Document 1]
JP-A-9-191588 (page 4, page 7, FIG. 1, FIG. 16)
[0005]
[Problems to be solved by the invention]
The stator core of the above conventional rotating electric machine has an insulation coating broken due to plastic deformation when the protrusions and depressions of the caulking portion are formed, so that the caulked portion is electrically short-circuited between the layers, resulting in a large eddy current loss. There is a problem of becoming.
[0006]
In addition, the caulking portion is distorted by plastic deformation, creating a space between the thin plates, increasing the magnetic resistance, and, in addition to the increase in eddy current loss, is a factor that impairs the performance of the rotating electrical machine. is there.
[0007]
Further, in a rotating electrical machine having a stator core divided into an outer core and an inner core, the inner core is separated into a plurality of teeth of salient poles, so that one point or two for each tooth for fixing in the stacking direction. Dot caulking is provided. Therefore, there is a problem that the number of crimps is increased and the performance of the rotating electrical machine is deteriorated as compared with a stator core formed by integrally molding the outer core and the inner core.
[0008]
The present invention has been made to solve the above problems, and in a rotating electrical machine having a stator core divided into an outer core and an inner core, the caulking that fixes the core pieces of the inner core is eliminated. The object is to improve the magnetic characteristics and not impair the productivity.
[0009]
[Means for Solving the Problems]
The rotating electrical machine according to the present invention is divided into an outer core obtained by laminating ring-shaped core pieces made of electromagnetic steel sheets and a plurality of separated inner cores made by laminating tea score pieces made of electromagnetic steel sheets. In a rotating electrical machine comprising a stator core and a coil mounted in the slot of the inner core,
The core piece of the outer core has a groove on the caulking part and the inner periphery, and the core pieces of the outer core are fixed by the caulking part,
The tee score piece of the inner core has no crimped portion, and the tee score pieces are fixed by being fitted into the groove of the core piece of the outer core ,
The inner core separated into a plurality is fixed by a winding frame that insulates the coil and the inner core and is divided in the direction of the lamination,
The winding frame is integrated by connecting the plurality of inner cores in a circular shape.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a plan view showing a stator core of a rotating electrical machine according to the present invention. As shown in the figure, the stator core 1 has an outer core 2 and an inner core 3, and the outer core 2 and the inner core 3 are formed by laminating core pieces made of thin electromagnetic steel plates punched out by a press. Become.
[0011]
The outer core 2 is provided with a caulking portion 2a that fits the protrusion and the depression and fixes the core pieces in the stacking direction.
[0012]
The inner core 3 is not provided with a caulking portion, and each tea score piece is fixed in the stacking direction by fitting each tea score piece into a groove on the inner peripheral side of the outer core 2.
[0013]
FIG. 2 is a plan view showing a manufacturing process of the stator core shown in FIG. The core sheet 5 is guided and positioned by the pilot pins 6. Each core piece is sequentially processed from the core sheet 5 by a press die through the processing steps (a) stage 1 to (e) stage 5, and the inner core 3 tee is formed in the inner circumferential groove of the core piece of the outer core 2. A stator core piece into which the score piece is fitted is manufactured.
[0014]
In stage 1 of (a), the inner diameter of the tea score piece 3b is punched out. In the stage 2 of (b), the slot shape 3a (leaving the tea score piece 3b) in which the coil is mounted is punched. In stage 3 of (c), the fitting portion 4 between the tea score piece 3b and the core piece 2b of the outer core 2 is processed by the pushback method, and the tea score piece 3b is fitted into the groove-like fitting portion 4. Sent to the next stage. In the stage 4 of (d), the protrusion and depression of the caulking portion 2a of the outer core 2 are formed. In the stage 5 of (e), the outer diameter of the core piece 2b of the outer core 2 is punched, and the punched core pieces 2b of the outer core 2 are sequentially stacked in the hole of the die. The stator core piece 1a in which the tee score piece 3b of the inner core 3 is fitted to the core piece 2b of the outer core 2 is fixed in the stacking direction and taken out from the discharge hole.
[0015]
FIG. 3 is a cross-sectional view for explaining the pushback method. In the figure, when the core sheet 5 is sandwiched between the lower mold 7a and the upper mold 7b (a) and the punch 7c processes the fitting portion 4, the tea score piece 3b is punched (b). The punched tea score piece 3b is sandwiched between a knockout 7d and a punch 7c provided in the lower mold 7a. When the punch 7c returns upward, the knockout 7d returns upward by the force of the spring 7e, and the tea score piece 3b is fitted into the processed fitting portion 4 (c). In the case of press punching, the width of the fitting portion of the punched core sheet 5 is several tens μm smaller than the width of the punched tea score piece 3b, so that the tea score piece 3b is returned to the original position by the force of the spring 7e. When returned, the tea score piece 3b is fixed in a state of being press-fitted into the fitting portion.
[0016]
FIG. 4 is a plan view showing a winding process for mounting a coil between slots of the inner core, and FIG. 5 is a cross-sectional view showing a state in which a winding frame is attached to the inner core.
[0017]
As shown in FIG. 4, the winding frame 8 is attached to the inner core 3 of the stator core (a) in which the stator core pieces are laminated (b).
[0018]
As shown in FIG. 5, the reel 8 includes a U-shaped portion 8a inserted from the stacking direction of the tea score pieces 3b of each inner core 3 and a flat plate-shaped portion 8b that closes the opening of the U-shaped portion 8a. Since the insulating member is divided into two parts, the winding frame 8 can be easily attached to the inner core 3.
[0019]
Further, as shown in FIGS. 4B and 4C, the winding frame 8 is integrated by connecting the insulating members provided in each inner core 3 on the inner peripheral side of the inner core 3. Yes.
[0020]
Moreover, you may divide the winding frame 8 into two U-shaped parts inserted from the lamination direction of the tea score piece 3b.
[0021]
Further, the winding frame 8 may be integrally formed with the inner core 3 and the outer core 2 by resin molding using a mold.
[0022]
Next, the outer core 2 and the inner core 3 are separated (c). At this time, the core pieces of the outer core 2 are fixed by the caulking portion 2a, so that they do not fall apart. Moreover, since each inner core 3 is integrally fixed by the winding frame 8, it does not fall apart.
[0023]
Next, the coil 9 is mounted between the slots of the inner core 3 (d), and the inner core 3 is fitted to the outer core 2 again (e).
[0024]
As described above, by using the pushback method for fitting the core piece of the outer core 2 and the tea core piece 3b of the inner core 3, the inner core 3 can be formed in the manufacturing process without providing a crimped portion. Since the tea score piece 3b of 3 can be prevented from falling apart, productivity is improved.
[0025]
Moreover, since the crimping portion is not provided in the inner core 3, the insulating coating between the tea core pieces 3b of the inner core 3 is not broken and does not come into electrical contact, and an efficient rotating electrical machine with low iron loss is obtained. It is done. Further, since no space is generated, the magnetic resistance does not increase and an efficient rotating electrical machine can be obtained.
[0026]
Moreover, since each tea core piece 3b of the inner core 3 fitted to the outer core 2 is fixed by the winding frame 8, the outer core 2 and the inner core 3 are separated, so that each inner core 3 is separated. Therefore, the winding 9 can be easily attached to the slot of the inner core 3.
In addition, although the coil shown to a figure is a shape which straddles several teeth, the concentrated winding type which mounts a coil for every teeth may be sufficient.
[0027]
【The invention's effect】
The rotating electrical machine according to the present invention is divided into an outer core obtained by laminating ring-shaped core pieces made of electromagnetic steel sheets and a plurality of separated inner cores made by laminating tea score pieces made of electromagnetic steel sheets. In a rotating electrical machine comprising a stator core and a coil mounted in the slot of the inner core,
The core piece of the outer core has a groove on the caulking part and the inner periphery, and the core pieces of the outer core are fixed by the caulking part,
The tee score piece of the inner core has no crimped portion, and the tee score pieces are fixed by being fitted into the groove of the core piece of the outer core ,
The inner core separated into a plurality is fixed by a winding frame that insulates the coil and the inner core and is divided in the direction of the lamination,
Since the winding frame is formed by integrally connecting the plurality of inner cores in a circular shape, the core piece and the tea core piece of the outer core are not separated in the manufacturing process, and productivity is improved. An efficient rotating electrical machine can be obtained.
[Brief description of the drawings]
FIG. 1 is a plan view showing a stator core of a rotating electrical machine according to the present invention.
2 is a plan view showing a manufacturing process of the stator core shown in FIG. 1. FIG.
FIG. 3 is a cross-sectional view for explaining a pushback method.
FIG. 4 is a plan view showing a winding process for mounting a coil between slots of an inner core.
FIG. 5 is a cross-sectional view showing a state in which a winding frame is attached to the inner core.
[Explanation of symbols]
1 stator core, 1a stator core piece, 2 outer core,
2a caulking part, 2b, 3b core piece, 3 inner core, 3a slot,
4 fitting part, 5 core sheet, 6 pilot pin, 7a lower mold, 7b upper mold,
7c punch, 7d knockout, 7e spring, 8 reel, 9 coil.

Claims (2)

A stator core divided into an outer core obtained by laminating ring-shaped core pieces made of electromagnetic steel sheets, and a plurality of separated inner cores made by laminating tea score pieces made of electromagnetic steel sheets, and slots of the inner cores In a rotating electrical machine with a coil attached to
The core piece of the outer core has a groove on the caulking part and the inner periphery, and the core pieces of the outer core are fixed by the caulking part,
The tee score piece of the inner core has no crimped portion, and the tee score pieces are fixed by being fitted into the groove of the core piece of the outer core ,
The inner core separated into a plurality is fixed by a winding frame that insulates the coil and the inner core and is divided in the direction of the lamination,
The rotating electric machine is characterized in that the plurality of inner cores are integrated by connecting the plurality of inner cores in a circular shape . A stator core divided into an outer core obtained by laminating ring-shaped core pieces made of electromagnetic steel sheets, and a plurality of separated inner cores made by laminating tea score pieces made of electromagnetic steel sheets, and slots of the inner cores In the manufacturing method of the rotating electrical machine provided with the coil mounted on,
Punching out the outer periphery of the outer core ring-shaped core piece and the outer shape of the tea score piece protruding from the inner periphery of the core piece from the electromagnetic steel sheet,
After punching out the tea score piece from the sheet so as to form a groove in the inner periphery of the core piece of the outer core, the pushback method step of fitting the tea score piece back into the groove of the sheet,
Forming a crimped portion between an inner periphery and an outer periphery of a core piece of the outer core, and not forming a crimped portion on the tea score piece ;
The step of punching out the outer periphery of the core piece of the outer core while punching out the stator core piece in which the tea score piece is fitted into the core piece of the outer core, while the tea score piece is fitted in the groove of the sheet,
Stacking the stator core pieces fitted with the teascore pieces, fitting the caulking portions, and forming the stator core in which the outer core and the inner core are integrated;
After the step of forming the stator core, the coil, the inner core and the outer core are insulated, and a winding frame divided in the stacking direction is attached to the inner core, and the plurality of inner cores are mounted. Connecting and integrating in a circular shape,
Separating the inner core and the outer core;
Attaching the coil to the slot of the inner core;
A method of manufacturing a rotating electrical machine, comprising a step of fitting the inner core on which the coil is mounted into the groove of the outer core .

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