JPS6116769Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator for a rotating electric machine such as a battery charging generator for an automobile.

FIG. 1 is a sectional view showing a part of a conventional stator of this kind, in which 1 is a stator core made of a stack of many punched thin iron plates, 2 is a slot of this stator core 1,
3 is an insulating film coated with resin on the inner peripheral surface of the slot 2, 4 is a stator coil wound inside the slot 2, and 5 is an insulating material such as fiber punched out into a plate shape as shown in FIG. With the slotted wedge,
As shown in FIG. 3, this slot wedge 5 is inserted by an automatic slot wedge insertion machine in the direction of arrow Since it is inserted into the entrance of the slot 2 by pressing, it has the following drawbacks.

That is, since the plate-shaped slot wedge 5 has a rectangular cross section and is angular, the contact resistance is large and it is difficult to insert it. Especially slot 2
If the insulating coating 3 coated with powder resin is thickly adhered to the inner circumferential surface of the stator wire, it becomes more difficult to insert the insulating coating 3, and in some cases, the insulating coating of the stator coil 4 may be destroyed. It was flawed.

It goes without saying that in order to eliminate the above-mentioned drawbacks, the cross-sectional area of the slot wedge 5 can be made smaller than that of the conventional one, but then the slot wedge 5 will have so-called play within the slot 2, making it difficult to transport the stator. This is the drawback of falling through the cracks.

The present invention aims to eliminate the above-mentioned drawbacks, and the embodiments shown in FIGS. 4 to 6 will be described below. In this figure, numerals 1,
Reference numerals 2, 3, and 4 indicate parts that are the same or equally effective as those of the conventional stator. 6 indicates a particularly ingenious slot wedge of the present invention.
This slot wedge 6 is made of an insulating material such as synthetic resin and has a round rod shape, and has tapered portions 6' of the same shape formed at both ends thereof.

Therefore, an insulating coating 3 coated with a powder resin is applied to the inner circumferential surface of a slot 2 formed in a stator core 1 formed by laminating a large number of punched thin iron plates. After winding the coil 4, as shown in FIG. 6, the coil 4 wound inside the slot 2 is pressed in the direction of the arrow Y by a tapered portion 6' formed at one end of the slot wedge 6. By pressing the slot wedge 6 in the direction of arrow X with an automatic slot wedge insertion machine, the slot wedge 6 is inserted into the entrance of the slot 2. The contact resistance at this time is that the slot wedge 6 according to the present invention has a round bar shape. Since the tapered part 6' is formed at the end, it is much smaller in width than the conventional one, and therefore it is extremely easy to insert and insert, and the insulation of the stator coil 4 is not required as in the conventional case. Accidents that destroy the coating can be completely eliminated.

As described above, according to the present invention, an insulating film coated with powder resin is applied to the inner circumferential surface of the slot of the stator core made of laminated punched thin iron plates, and the stator wire is wound within the slot. In the stator of a rotating electrical machine, a round rod-shaped slot wedge made of an insulating material with tapered portions of the same shape on both ends is inserted into the entrance of the slot, so the contact resistance during insertion is greatly reduced. In addition to being small, the serious drawback of the conventional method that the insulating film is destroyed can be completely eliminated. moreover,
Since the slot wedge according to the present invention has tapered parts of the same shape on both ends, it can be inserted into the slot of the stator in the same way from either tapered part of the slot wedge, so the insertion work can be done by an automatic machine. In this case, the automatic slot wedge insertion machine does not require any complicated device for specifying the insertion direction, and thus the manufacturing cost can be greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a part of a conventional stator of this type, FIG. 2 is a perspective view of a slot wedge fitted into the stator, and FIG. 3 is a sectional view taken along the line - FIG. 1. The inserted state of the slot wedge 6 is shown. Fig. 4 is a sectional view showing a part of a stator according to an embodiment of the present invention, Fig. 5 is a perspective view of a slot wedge fitted into the stator, and Fig.
A cross-sectional view taken along the line of FIG. 1 shows the inserted state of the slot wedge. In the figure, 1 is a stator core, 2 is a slot, 3 is an insulating coating, 4 is a stator coil, 6 is a slot wedge, and 6' is a tapered portion.

Claims (1)

[Scope of utility model registration request] In a stator for a rotating electric machine, in which an insulating film coated with powder resin is applied to the inner peripheral surface of a slot of a stator core made of laminated punched thin iron plates, and a stator wire is wound within the slot, the entrance of the slot is A stator for a rotating electric machine, characterized in that a round rod-shaped slot wedge made of an insulating material and having tapered portions of the same shape at both ends is inserted into the stator.