JP2004343939A - Rotary electric machine and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve magnetic characteristics by eliminating caulking for fixing core pieces of an inner core together, while no productivity is degraded, in a rotary electric machine comprising a split stator core, an outer core, and an inner core. <P>SOLUTION: The rotary electric machine comprises a split stator core 1 composed of an outer core 2 where a ring-like core piece of electromagnetic steel plate is laminated and a plurality of separate inner cores 3 where a teeth core piece of electromagnetic steel plate is laminated, and a coil attached to the slot of the inner core 3. The core piece of the outer core 2 comprises a caulking part 2a and an engagement part 4, on an inner periphery, and the core pieces of the outer core 2 are fixed together by the caulking part 2a. The teeth core pieces of the inner core 3 has no caulking part, and are fixed together by engaging with the engagement part of the core piece of the outer core 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to improving the performance of a rotating electric machine, and an object of the present invention is to improve the deterioration of magnetic characteristics due to caulking for fixing core pieces of an iron core having laminated core pieces.
[0002]
[Prior art]
In general, a stator core of a rotating electric machine has a configuration in which, in order to suppress heat loss due to eddy current, core pieces made of thin plates whose surfaces are coated with insulation are laminated to insulate each core piece in the laminating direction. In this case, there is a problem that if the core pieces are disjointed at the time of assembling, it is difficult to handle and the productivity is reduced. Therefore, a method has been devised in which the core pieces are fixed by caulking and integrated to facilitate the handling ( For example, see Patent Document 1).
[0003]
The shape of the swaging includes a V shape, a round shape, and the like. In each case, the projections and depressions are formed in the plate pressure direction by plastic deformation, and the thin plates are fixed to each other by fitting the projections and depressions.
[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 conventional rotating electric machine, when the protrusions and dents of the caulked portion are formed, the insulating coating is broken by plastic deformation, so the caulked portion is electrically short-circuited between the laminations, and the eddy current loss is large. Problem.
[0006]
In addition, the caulked portion is distorted by plastic deformation, creating a space between the thin plates, increasing the magnetic resistance, and increasing the eddy current loss, which is a problem that impairs the performance of the rotating electric machine. is there.
[0007]
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 having salient poles. Point caulking is provided. Therefore, compared with the stator core in which the outer core and the inner core are integrally formed, there is a problem that the number of swagings increases and the performance of the rotating electric machine deteriorates.
[0008]
The present invention has been made in order to solve the above-described problems, and in a rotating electric machine having a stator core divided into an outer core and an inner core, eliminating the caulking that fixes the core pieces of the inner core. An object of the present invention is to improve magnetic properties and not to impair productivity.
[0009]
[Means for Solving the Problems]
The rotating electric machine according to the present invention is divided into an outer core formed by stacking ring-shaped core pieces made of an electromagnetic steel sheet, and an inner core divided into a plurality of stacked tea core pieces made of an electromagnetic steel sheet. In a rotating electric machine having a stator core and a coil mounted in a slot of the inner core,
The core piece of the outer core has a caulked portion and a groove on the inner periphery, and the core pieces of the outer core are fixed by the caulked portion,
The tee score pieces of the inner core have no caulked portions, and the tee score pieces are fixed to each other by being fitted into the grooves of the core pieces of the outer core.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a plan view showing a stator core of a rotating electric 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 a thin electromagnetic steel sheet punched by a press. Become.
[0011]
The outer core 2 is provided with a caulking portion 2a that fits the protrusion and the recess to fix the core pieces in the stacking direction.
[0012]
The inner core 3 is not provided with a caulking portion, and each tee score piece is fixed in the laminating direction by fitting each tee score piece into an inner circumferential groove of the outer core 2.
[0013]
FIG. 2 is a plan view showing a step of manufacturing the stator core shown in FIG. The core sheet 5 is guided and positioned by the pilot pins 6. Each core piece is processed sequentially from the core sheet 5 by a pressing die through the processing steps of (a) stage 1 to (e) stage 5, and the tee of the inner core 3 is inserted into the inner circumferential groove of the core piece of the outer core 2. A stator core piece fitted with the score piece is manufactured.
[0014]
In stage 1 of (a), the inner diameter of the tee score piece 3b is punched. In the stage 2 of (b), the slot shape 3a (leaving the tee score piece 3b) in which the coil is mounted is punched. In the stage 3 of (c), the fitting part 4 of the tee score piece 3b and the core piece 2b of the outer core 2 was processed by the pushback method, and the tee score piece 3b was fitted to the groove-like fitting part 4. In the state, it is sent to the next stage. In the stage 4 shown in (d), the projections and depressions of the swaged 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 holes of the die. The stator core pieces 1a in which the core pieces 2b of the outer core 2 are fitted with the tee core pieces 3b of the inner core 3 are fixed in the stacking direction, and are taken out from the discharge holes.
[0015]
FIG. 3 is a cross-sectional view for explaining the pushback method. In the figure, the core sheet 5 is sandwiched between the lower mold 7a and the upper mold 7b (a), and when the fitting 7 is processed by the punch 7c, the tee score piece 3b is punched (b). The punched tee score piece 3b is sandwiched between a knockout 7d provided on the lower mold 7a and a punch 7c. When the punch 7c returns upward, the knockout 7d returns upward by the force of the spring 7e, and the tee score piece 3b fits 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 becomes smaller by several tens of μm than the width of the punched tee score piece 3b, so that the tee score piece 3b is returned to the original position by the force of the spring 7e. When returning, the tee score piece 3b is fixed while being pressed into the fitting portion.
[0016]
FIG. 4 is a plan view showing a winding step of mounting a coil between slots of the inner core, and FIG. 5 is a cross-sectional view showing a state where a bobbin 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 stacked (b).
[0018]
As shown in FIG. 5, the winding frame 8 includes a U-shaped portion 8a inserted from the lamination direction of the tee core pieces 3b of each inner core 3 and a flat plate-shaped portion 8b closing 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 insulating members provided on each inner core 3 on the inner peripheral side of the inner core 3. I have.
[0020]
Further, the winding frame 8 may be divided into two U-shaped portions to be inserted from the lamination direction of the tee score pieces 3b.
[0021]
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, since the core pieces of the outer core 2 are fixed by the caulking portion 2a, they do not fall apart. Further, since the inner cores 3 are integrally fixed by the winding frame 8, they do 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 in which the core piece of the outer core 2 and the tee score piece 3b of the inner core 3 are fitted, the inner core 3 can be manufactured in the manufacturing process without providing a caulked portion. Since the tee score pieces 3b of 3 can be prevented from falling apart, the productivity is improved.
[0025]
In addition, since the inner core 3 is not provided with a caulked portion, the insulating coating between the tee core pieces 3b of the inner core 3 is not broken to make electrical contact, and an efficient rotating electric machine with less iron loss is obtained. Can be In addition, since no space is generated, an efficient rotating electric machine can be obtained without an increase in magnetic resistance.
[0026]
In addition, after fixing each tee score piece 3b of the inner core 3 fitted to the outer core 2 with the winding frame 8, the outer core 2 and the inner core 3 are separated from each other. , And the winding 9 can be easily mounted in the slot of the inner core 3.
Although the coil shown in the figure has a shape that straddles a plurality of teeth, a concentrated winding type in which a coil is attached to each tooth may be used.
[0027]
【The invention's effect】
The rotating electric machine according to the present invention is divided into an outer core formed by stacking ring-shaped core pieces made of an electromagnetic steel sheet, and an inner core divided into a plurality of stacked tea core pieces made of an electromagnetic steel sheet. In a rotating electric machine having a stator core and a coil mounted in a slot of the inner core,
The core piece of the outer core has a caulked portion and a groove on the inner periphery, and the core pieces of the outer core are fixed by the caulked portion,
The tea score piece of the inner core has no caulked portion, and is fitted to the groove of the core piece of the outer core, so that the tea score pieces are fixed to each other. The core piece and the tee score piece of the outer core do not fall apart, so that productivity is improved and an efficient rotating electric machine is obtained.
[Brief description of the drawings]
FIG. 1 is a plan view showing a stator core of a rotating electric machine according to the present invention.
FIG. 2 is a plan view showing a manufacturing process of the stator core shown in FIG.
FIG. 3 is a cross-sectional view for explaining a pushback method.
FIG. 4 is a plan view showing a winding step of mounting a coil between slots of an inner core.
FIG. 5 is a cross-sectional view showing a state where a bobbin is attached to the inner core.
[Explanation of symbols]
1 stator core, 1a stator core piece, 2 outer core,
2a crimping portion, 2b, 3b core piece, 3 inner core, 3a slot,
4 fitting part, 5 core sheet, 6 pilot pin, 7a lower die, 7b upper die,
7c punch, 7d knockout, 7e spring, 8 reels, 9 coils.

Claims (7)

A stator core divided into an outer core formed by stacking ring-shaped core pieces made of an electromagnetic steel sheet, and an inner core divided into a plurality of pieces formed by stacking tee core pieces made of an electromagnetic steel sheet, and slots of the inner core In a rotating electric machine having a coil attached to
The core piece of the outer core has a caulked portion and a groove on the inner periphery, and the core pieces of the outer core are fixed by the caulked portion,
The rotating electric machine, wherein the tee score pieces of the inner core have no caulking portions, and the tee score pieces are fixed to each other by being fitted into the grooves of the core pieces of the outer core. The rotating electric machine according to claim 1, wherein the plurality of inner cores are fixed by a winding frame that insulates the coil and the inner core. The rotating electric machine according to claim 2, wherein the winding frame is divided into two in the direction of the lamination. The rotating electric machine according to claim 2, wherein the winding frame is integrated by connecting insulating members that insulate the plurality of inner cores. The rotating electric machine according to claim 2, wherein the winding frame is integrally formed with the plurality of inner cores by resin molding. A stator core divided into an outer core formed by stacking ring-shaped core pieces made of an electromagnetic steel sheet, and an inner core divided into a plurality of pieces formed by stacking tee core pieces made of an electromagnetic steel sheet, and slots of the inner core In a method of manufacturing a rotating electric machine having a coil mounted on,
A step of punching the outer periphery of the inner core of the ring-shaped core piece of the outer core and the outer shape of the T-score piece projecting from the inner circumference of the core piece from the sheet of the electromagnetic steel sheet;
After punching the tee score piece from the sheet so as to form a groove on the inner periphery of the core piece of the outer core, a step of a pushback method in which the tee score piece is fitted back into the groove of the sheet,
Forming a caulked portion between the inner circumference and the outer circumference of the core piece of the outer core,
While the T-score piece is fitted in the groove of the sheet, the outer periphery of the outer core core piece is punched out, and a stator core piece in which the T-score piece is fitted to the outer core core piece is punched out,
Stacking the stator core pieces in which the tee score pieces are fitted, fitting the caulked portions, and forming the stator core in which the outer core and the inner core are integrated,
A method for manufacturing a rotating electric machine, comprising: After the step of forming the stator core, a step of mounting an integrated winding frame for insulating the coil, the inner core and the outer core to the inner core,
A step of separating the inner core and the outer core,
Mounting the coil in the slot of the inner core,
The method for manufacturing a rotating electric machine according to claim 5, further 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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