JPS6336222B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulating structure for a rotating electric machine coil.

The shapes of commonly used rotating electric machine coils are shown in FIGS. 1 and 2.

In these figures, 1 indicates a straight portion, and a mica tuft 5 is wound on a coil conductor 4.

2 indicates a coil end portion around which an insulating tape 6 is wound. 3 indicates an overlapping portion between the mica tuft 5 wound around the straight portion 1 and the insulating tape 6 wound around the coil end portion 2.

The above-mentioned rotating electric machine coil is made by winding mica tufts 5 a required number of times around the straight portion 1 of the coil conductor 4, and wrapping an insulating tape 6 a required number of times so as to overlap the ends of the wound mica tufts 5, thereby providing insulation. A rotating electric machine coil having the desired insulation properties is manufactured by impregnating and curing and polymerizing.

When winding the mica tufts 5 a large number of times in this manner, the length of the tweezers becomes extremely long, so two layers of the mica tufts 5 may be wound.

In addition, if it is necessary to have both electrical and mechanical properties, it is necessary to wind the aggregate mica tuft and the flake mica tuft alternately so as to overlap each other.

Conventionally, when wrapping mica tupa 5 with two layers of laminated mica tupa and flake mica tupa,
Although the overlapping part 3 of the mica tuple 5 and the insulating tape 6 is tapered, the slope of this taper is not uniform, so spots and voids are likely to be formed, resulting in a problem that the reliability of the insulation is lowered.

Particularly, when mechanical properties are required, a part of flake mica tupa is mixed, but if flake mica tupa is mixed, the adhesive strength between the coil conductor 4 or the core becomes weak and voids occur. The problem was that it was easy to do.

This invention was made in order to solve the above-mentioned problems, and by devising the shape of the mica tuft, it is possible to arrange the mica tuft in the innermost layer, the outermost layer, and the overlapping part of the tuft that is wound. The purpose is to obtain a highly reliable insulation structure for rotating electrical machine coils.

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

FIG. 3 is a plan view showing the shape of the mica tupa when two sheets are stacked, and the same parts as in FIGS. 1 and 2 are given the same reference numerals. In Figure 3, 7
indicates a laminated mica tupa, 8 denotes a flake mica tupa, and the lengths A and C of the laminated mica tupa 7 are lengths that can be wound around the coil conductor 4 at least once,
B is the taper length of the inclined side. The flake mica tuft 8 is formed into a section having the same slope as the aggregate mica tuft 7.

As shown in Figure 3, flake mica tupa 8
The flake mica tufts 8 are placed inside the mica tufts 7 and wound around the coil conductor 4 in such a way that the tapered part of the mica tuppers 8 comes out to the outside of the mica tuppers 7.

In this way, both mica tufts 7 are attached to the coil conductor 4.
The cross-sectional view of the tapered part after winding the coil conductor 8 is as shown in FIG. Furthermore, since the interface of the overlapping portion 3 between the mica tuple 7, 8 and the insulating tape 6 is smooth and tapered, a good insulating structure is obtained without the occurrence of spots or voids.

Therefore, in the insulating structure of the rotary electric machine coil according to the present invention, each interface state is good, that is, between the coil conductor 4 and the mica tuft 7, between the mica tuft 7 and the core, and between the mica tuple 7 and the insulating tape 6. The adhesive force between the two is strengthened by the mica tuple assembly 7, and highly reliable insulation can be obtained.

Figure 5 is a characteristic diagram showing the results of a salt water charging life test (NaCl 5% rated voltage charging), where curve 9 shows the conventional method and curve 10 shows the insulation structure shown in Figure 4. , curve 11 shows the case where only the mica tuft 7 is used.

As can be understood from FIG. 5, the method of the present invention (curves 10 and 1
1) is found to have much higher reliability.

FIG. 6 is a characteristic diagram showing mechanical property data, and curve 12 shows only the conventional flake mica tuppa.

As can be understood from FIG. 6, the mechanical properties of the product (curve 10) using part of the mica tuft of the present invention shown in FIG. 4 are not inferior to those of the conventional product. .

In the above embodiment, the flake mica tupa 8 is used as the material for the tuft that is used in conjunction with the laminated mica tupa 7, but the same method can be used by using other materials, such as thin leaf materials such as Nomex and Mylar film, as the tuft. A reliable insulation structure can be achieved.

As described above, according to the present invention, the assembled mica tufts can be provided in the innermost layer, the outermost layer, and the overlapping part of the tufts wound around the straight part of the coil conductor, and the ends of the tufts have a uniform taper. As a result, the adhesive force at the interface between the coil conductor and the tuft, the interface between the tuft and the core, and the interface between the tuft and the insulating tape is strengthened by the mica tuft, and highly reliable insulation without spots or voids can be obtained. It has the effect of being able to

[Brief explanation of the drawing]

Fig. 1 is an external view showing the shape of a general rotating electrical machine coil, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, Fig. 3 is a plan view showing an example of a tether used in the present invention, and Fig. 4 The figure is a sectional view showing an overlapping part of a wrapper and an insulating tape according to an embodiment of the present invention.
FIG. 5 is a characteristic diagram showing the results of a salt water charging life test, and FIG. 6 is a characteristic diagram showing the residual rate of dielectric breakdown voltage due to repeated fatigue. 1 is a straight section, 2 is a coil end section, 3 is an overlapping section, 4 is a coil conductor, 5 is a mica tuppa, 6 is an edge tape, 7 is a laminated mica tuppa, and 8 is a flake mica tuppa. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An insulating structure for a rotating electric machine coil, in which a wrapper is wound around a straight part of a coil conductor inserted into a throttle part, and an insulating tape is wound around a coil end part connected to the straight part so as to have an overlapping part with respect to the wrapper. In the method, the tuft is constructed using at least a laminated mica tuppa, and has a shape having an inclined side that becomes narrower toward the end that becomes the outer layer when wound around the straight part, and is wound around the straight part. An insulating structure for a rotating electric machine coil, characterized in that the laminated mica tufts are provided in the innermost layer, the outermost layer, and the overlapping portion of the tufts.