JPH0538084A - Stator core for electric rotating machine - Google Patents

Abstract

PURPOSE:To insulate the coil end positively against a stator core and to mold even the stator core positively with synthetic resin when the stator core is integrally molded with insulating synthetic resin and the coil end part is brought close to the side face of the stator core in order to downsize an electric rotating machine by shortening the axial dimension thereof. CONSTITUTION:Discontinuous outer peripheral side face part 5 of stator core is disposed on the outer peripheral part of a stator core 1 in order to prevent the stator core 1 from being pressure deformed by a molding die and to realize positive molding. The outer peripheral side face part 5 is located at the branch of the slot 2 for the coil winding. According to the invention, side face of the stator core 1 is insulated positively against the coil winding resulting in a thin downsized stator core. Furthermore amount of copper is reduced and the input can be lowered through shortening of the coil end dimension.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core of a rotary electric machine, and more particularly to a stator core of a rotary electric machine in which the stator core is covered by a synthetic resin integral mold to shorten the axial dimension.

[0002]

2. Description of the Related Art In a rotary electric machine, the coil end portion of a coil winding attached to a stator core is made as close as possible to the side surface of the stator core for the purpose of shortening the axial dimension by miniaturization. The method of letting is adopted. In this case, it is necessary to ensure sufficient insulation between the coil end portion and the side surface of the stator core. On the other hand, the stator core is insulated from the coil winding in the slot by inserting an insulating material such as a polyester film between the inner circumferential surface of the slot and the coil winding. In this case, in the step of winding the coil winding around the stator core, the slot insulator may come off from the slot and cause insulation failure of the coil.

Techniques for treating the side surfaces of these stator cores and the insulation in the slots are disclosed, for example, in Japanese Utility Model Publication No. 49-150.
No. 602 and Japanese Utility Model Laid-Open No. 54-36701.

In all of these, the side surfaces of the stator core and the inner circumferential surfaces of the slots are insulated from each other by a synthetic resin mold to insulate the coil windings from the stator core, which are effective in solving the above-mentioned problems. It has not completely solved the problem.

That is, in Japanese Utility Model Application Laid-Open No. 54-36701, a coil for lowering the coil end height of the coil winding is provided by a short cylindrical rising portion at the outer peripheral edge of the insulating member made of synthetic resin. There is no escape for the end. In the case of Japanese Utility Model Laid-Open No. 49-150602, both sides of the stator core in the axial direction are covered with synthetic resin, and a general molding method is injection molding as shown in FIG. In this case, it is necessary to fix the stator core in the molding die, and generally, the inner diameter side of the stator core is pressed by the die while being fixed, and injection molding is performed. However, in this case, since the pressing force is applied to the inner diameter side by pressing the inner diameter side as shown by the arrow P, a reaction force in the direction of the arrow Q acts on the outer peripheral edge portion of the stator core laminated several times, The outer peripheral edge portion of the stator core swells, and it becomes difficult to maintain the predetermined dimensional accuracy of the lamination, and the thickness of both side surfaces of the synthetic resin in the axial direction becomes thin. For this reason, it is necessary to take into consideration this changing dimensional amount to the required predetermined thickness, and it remains a problem to reduce the height of the coil end.

When the outer peripheral edge portion of the stator core is continuously pressure-fixed in the molding die, the entire outer peripheral edge portion of the stator core is not covered with the synthetic resin, and the stator core is When the height of the coil end is reduced, it becomes necessary to secure an insulation dimension with the side surface of the stator core, which makes it impossible to achieve the purpose.

[0007]

SUMMARY OF THE INVENTION In the above-mentioned prior art, for the purpose of shortening the axial dimension due to downsizing of the rotating electric machine, the insulation of the coil core end from the outer peripheral edge of the stator core and the synthetic resin The dimensional change of the laminated stator cores during pressurization due to the mold used for injection molding is not taken into consideration and remains a problem.

[0008]

As a measure for solving the above-mentioned problems, the present invention is capable of pressurizing the outer peripheral edge portion of the stator core, and the coil end portion of the coil winding is fixed to the stator core. In order to be able to come close to the side surface of the stator core, a discontinuous exposed portion of the stator core is provided on the side surface of the outer peripheral edge of the stator core. The exposed portion of the stator core is arranged at the branch portion of the transition of the coil winding.

[0009]

[Function] When the stator core is integrally molded with the synthetic resin, the inner peripheral side surface of the stator core and the outer peripheral side surface of the stator core are discontinuously pressed and fixed by the injection molding die so that they are applied to the stator core. It is possible to obtain a uniform thickness molded product of synthetic resin material by making the pressure direction the same for both the inner peripheral side surface and the outer peripheral side surface, and to prevent the discontinuity generated on the outer peripheral side surface of the stator core. With respect to the exposed portion of the stator core, the coil end of the coil winding is located at the coil end of the coil winding, and the branching portion of the coil winding arranged outside is located at the branch portion. It is possible to shorten the axial dimension without contacting the exposed portion.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall view of a stator core covered with a synthetic resin integral mold, and FIG. 2 is a sectional view taken along the line AA 'of FIG.
FIG. 2 is a partial sectional view showing a section BB ′ of FIG. 1.

The stator core 1 is a stator core formed by laminating a plurality of stator iron plates, and has slots 2 on its inner peripheral surface. The stator core 1 is made of a synthetic resin 4 having high electric insulation and heat resistance. The inner surface of the slot 2 on the inner peripheral surface of the stator core 1, the outer peripheral portion 3 of the stator core 1, and the stator core 1 Both side surfaces in the axial direction are also encapsulated by integral molding.

A stator core inner peripheral edge side surface portion 6 is provided on the inner peripheral edge of the stator iron core 1, and a stator core outer peripheral edge side surface portion 5 is provided on the outer peripheral edge thereof.
Are provided, and this portion is not integrally molded with the synthetic resin 4, and the stator core 1 is exposed. Further, the outer peripheral side surface portion 5 of the stator core on the outer peripheral edge of the stator core 1 is exposed discontinuously.

FIG. 5 is a conceptual diagram of a general injection molding method for molding the stator core 1 with the synthetic resin 4.

The stator core 1 is formed by a molding die (1) 7 and a molding die (2) 8 on a part of both axial side surfaces of the stator core 1, that is, the outer peripheral side surface portion 5 of the stator core 1, and The inner peripheral side surfaces 6 of the stator core are pressed and fixed in the directions of the arrows P, respectively. Further, the inner peripheral surface of the stator core 1 is closely adhered by the molding die (2) 8 so that the synthetic resin 4 is not injected, and at the same time, the accuracy in the axial direction is secured, and the stator core 1
Is fixed.

The synthetic resin 4 injected from the gate 9 is encapsulated in a molding die (1) 7 and a molding die (2) 8 by injection molding in a necessary portion of the stator core 1.

The stator core 1 is formed by the molding die (1) 7 and the molding die (2) 8 so that the stator core outer peripheral side surface portion 5 and the stator core inner peripheral side surface portion 6 are simultaneously moved in the direction of arrow P. It is fixed under pressure as described above,
In this case, the inner peripheral edge portion and the outer peripheral edge portion of the stator core 1 are counteracted with respect to the outer peripheral edge portion of the stator core 1 as described in the section of the prior art due to the application of the pressing force in the same direction. It is possible to mold uniformly and surely without generating force.

FIG. 6 is a state diagram in which the coil winding is incorporated using the stator core 1 covered with the synthetic resin 4, and FIG. 7 is a partial cross section showing the state of the coil end. In FIG. 6, the coil winding (1) 10 is located on the outer peripheral side of the coil winding (2) 11, and the cross section in this state is as shown in FIG. 7. That is, a predetermined coil winding (1) 10 and a predetermined coil winding (2) 11 are wound and inserted in the slot 2 of the stator core 1, and each coil winding is slot 2
The groove insulation 1 so that it does not jump out to the inner circumference of the stator core 1.
Held by two.

In order to shorten the axial height of the coil end, the coil winding (1) 10 and the coil winding (2) 1
1 is shaped and compressed toward the side surface of the stator core 1. At this time, since the coil winding (2) 11 is arranged on the inner peripheral side of the coil winding (1) 10, the coil winding (1) 1
Coil winding (1) that does not jump out from 0 to the outer peripheral side
It is possible to shorten the axial height of the coil end by preventing the projecting end portion 13 of 10 from coming into contact with the stator core outer peripheral side surface portion 5 that exposes the stator core 1. .

As shown in FIG. 6, the stator core outer peripheral edge side surface portion 5 is located at a branch portion of the coil winding (1) 10 arranged on the outer peripheral side of the coil winding (2) 11 to the respective slots. By setting the positional relationship in advance,
Contact between the coil winding (1) 10 and the outer peripheral side surface 5 of the stator core can be prevented, and the height of the coil end in the axial direction can be shortened.

[0021]

As described above, according to the present invention, it is possible to mold the stator core easily and surely with the synthetic resin, and the side surface of the stator core and the coil winding. And reliable insulation is obtained, and this effect is very large.

It is possible to reduce the size and thickness of the rotating electric machine, reduce the amount of copper by shortening the coil end size, save resources and energy by reducing input, and make great economic contributions.
In particular, a so-called resin-molded rotating electric machine having a structure in which the entire stator core around which the coil winding is inserted is also molded by resin and also serves as an outer frame, is very effective.

[Brief description of drawings]

FIG. 1 is an overall view in which a stator core according to an embodiment of the present invention is encapsulated by a synthetic resin integral mold.

FIG. 2 is a partial cross-sectional view of a cross section AA ′ of FIG.

FIG. 3 is a partial cross-sectional view of the cross section BB ′ of FIG.

FIG. 4 is a conceptual diagram showing an injection molding operation according to a conventional example.

FIG. 5 is a conceptual diagram showing an injection molding operation according to the embodiment of the present invention.

FIG. 6 is a partial view showing an arrangement of coil windings according to an embodiment of the present invention.

FIG. 7 is a partial sectional view showing a state diagram of a coil end according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stator core, 2 ... Slot, 3 ... Stator core outer peripheral part, 4 ... Synthetic resin, 5 ... Stator core outer peripheral side surface part, 6 ...
Stator core inner peripheral side surface, 7 ... Mold (1), 8 ... Mold (2), 9 ... Gate, 10 ... Coil winding (1), 11
... coil winding (2), 12 ... groove insulation, 13 ... protruding end.

Claims (2)

[Claims] 1. A stator core of a rotary electric machine, comprising a plurality of laminated iron plates for a stator, wherein an inner surface of each slot of an inner peripheral surface thereof, an outer peripheral portion of the stator core, and both axial side surfaces are made of synthetic resin. The stator core of a rotating electric machine, which is encapsulated by the integral mold of and has an exposed portion of the stator core which is discontinuous on both axial side surfaces or one side surface of the outer peripheral edge portion. 2. A coil winding which has a plurality of coil windings and which is arranged on the outer peripheral side so as not to come into contact with an exposed portion of a discontinuous stator core provided at the outer peripheral edge portion. 2. The stator core of a rotating electric machine according to claim 1, wherein a winding wire is arranged on each slot, and an exposed portion of the stator core is located at a branch portion of the coil winding.