JPH10210694A - Insulating coil for dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve withstand voltage deterioration, while minimizing the increase of the thickness for insulation by impregnating an insulated coil, in which an insulating layer consisting of a compiled mica tape where a heat- resistant film and mica paper are laminated and a capton CR tape is made, with heat-resistant thermosetting solventless resin, and then, hardening it. SOLUTION: Around a coil where element wires of winding leads 10 being given insulation for element wires are bundled together, a polyimide compiled mica tape 12 where a heat-resistant film and mica paper are laminated as an insulation to ground is wound once by half a lap, and thereon, a capton CR tape 14 is wound twice by half a lap each, and further, thereon a glass tape 15 is wound once to bump each other, thus insulation to ground is applied. After that, this is inserted into a model slot, and heat-resistant thermosetting solventless resin is injected into it, and impregnation under vacuum pressurization is performed, it is hardened under heating condition fit for the impregnation resin, thus the insulated coil of a dynamo-electric machine is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated wire ring of a rotating electric machine used for, for example, a main motor for a vehicle.

[0002]

2. Description of the Related Art A conventional main motor for a vehicle is mainly a DC motor, and its insulation system has mainly considered heat resistance. However, the main motors for vehicles are constantly required to be small, light, high power, and maintenance-free, and with the recent development of semiconductor elements, DC induction motors have been replaced with AC induction motors by inverter control (PWM method). It is becoming mainstream. When the induction motor is driven by the inverter, a surge voltage generated by switching of the inverter element is superimposed on the output voltage of the inverter and applied to a terminal of the induction motor. This voltage is
Although it depends on the switching speed of the inverter element and the wiring conditions, it may reach about twice the DC voltage of the inverter. For this reason, in the insulation system of the induction motor to the ground, it is necessary to consider not only the heat resistance conventionally studied but also the withstand voltage degradation.

As a conventional insulating material which simultaneously satisfies both heat resistance and withstand voltage degradation, there is a mica tape formed of a heat-resistant film in which mica paper is bonded to a heat-resistant film with an adhesive. A typical example of the heat-resistant film is a polyimide film, such as Kapton H film (manufactured by DuPont) and Upilex film (manufactured by Ube Industries). In recent years, a film having improved withstand voltage deterioration property by incorporating alumina fine particles into a heat-resistant polyimide film has appeared (Kapton CR tape, manufactured by DuPont). This Kapton CR tape is a film excellent in withstand voltage deterioration while having the same heat resistance as that of a conventional polyimide film (Kapton H).

A polyimide laminated mica tape which satisfies heat resistance and withstand voltage degradation has a three-layer structure in which a polyimide film and mica paper are bonded with an adhesive, so that the thickness becomes large and the space factor is inferior. there were. Further, although Kapton CR tape has better withstand voltage deterioration property than Kapton H tape, the withstand voltage deterioration property per layer is lower than that of the above-mentioned polyimide mica tape.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to solve these drawbacks and to improve the insulation of a polyimide film of a conventional DC main motor for vehicles. It is an object of the present invention to provide an insulated wire ring of a rotating electric machine having substantially the same insulation thickness and having the same withstand voltage deterioration as that of polyimide-mica mica insulation.

[0006]

Means for achieving the object are as described in claim 1, wherein an insulated wire loop having an insulating layer made of a heat-resistant insulating tape in a conductor is inserted into a core slot. After a wedge is installed in the upper part of the slot so that the insulated wire is fixed in the slot, a solvent-free heat-resistant resin is filled in the insulated wire and the gap between the insulated wire and the iron core, and it is hardened and manufactured. In the insulated wire loop of the electric machine, the insulating layer contains a heat-resistant film and a mica paper as a heat-resistant film laminated mica tape, for example, a polyimide laminated mica tape in which a mica paper is laminated with a polyimide film, and an inorganic material. For example, a Kapton CR tape is used as a heat-resistant tape. Further, in claim 2, the heat-resistant film-assembled mica tape comprises a Kapton CR-assembled mica tape in which a Kapton CR film and mica paper are adhered to each other, and a Kapton CR tape as a heat-resistant tape containing an inorganic substance.

The effect is that even if a partial discharge occurs inside the insulating layer, the scale-like mica foil, which is an inorganic insulating material in the polyimide-mica-mica tape, overlaps in a layered manner, and the deterioration of the insulation deteriorates. In addition, the Kapton CR tape, which has a small thickness and withstands voltage deterioration, is used for the insulating layers other than the polyimide mica tape layer to prevent insulation deterioration due to partial discharge. .

According to a second aspect of the present invention, the Kapton C film having a withstand voltage deterioration property is also provided in the film layer of the heat-resistant film laminated mica tape.
By using an R tape, it is intended to further improve the withstand voltage degradation. Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0009]

FIG. 1 is a sectional view of an insulated wire loop of a rotating electric machine according to an embodiment of the present invention, and FIG. 2 is a sectional view of the rotating electric machine according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the insulated wire of the rotary electric machine of Comparative Example 1 of the present invention, and FIG. 4 is a cross-sectional view of the insulated wire of the rotary electric machine of Comparative Example 2 of the present invention.

[Embodiment 1] In FIG.
And a half of polyimide mica tape 12 is superimposed on the wire bundle obtained by bundling the wire conductor 10 subjected to
Twice, the Kapton CR tape 14 was 重 ね stacked twice, and a glass tape 15 was butted thereon and wound once to provide ground insulation. After that, insert it into the model slot, inject heat-resistant thermosetting non-solvent resin, perform vacuum pressure impregnation,
It was cured under heating conditions suitable for the impregnated resin to produce an insulated wire loop for a rotating electric machine. This is designated as Sample A.

[Embodiment 2] In FIG. 2, a Kapton CR laminated mica tape 13 is superimposed on the wire bundle bundled in the same manner as in FIG. The glass tape 15 was butt-bonded twice and wound one time to provide ground insulation. afterwards,
Inserted into the model slot, the same heat-resistant thermosetting non-solvent resin as in Fig. 1 was injected, vacuum impregnated, and cured under heating conditions suitable for the impregnated resin to produce an insulated wire for rotating electric machine. . This is designated as Sample B.

[Comparative Example 1] In FIG. 3, a Kapton CR as a ground insulation was attached to a wire bundle bundled in the same manner as in Example 1.
Tape 14 is 重 ね stacked three times, and a glass tape 1
No. 5 was butt-butted and wound once to provide ground insulation. After that, it is inserted into the model slot, the same heat-resistant thermosetting non-solvent resin as in Example 1 is injected, vacuum impregnation is performed, and the resin is cured under heating conditions suitable for the impregnated resin, and the insulated wire loop of the rotating electric machine is obtained. Was made. This is designated as Sample C.

[Comparative Example 2] In FIG. 4, a polyimide laminated mica tape 12 was overlapped three times as ground insulation on a wire bundle bundled in the same manner as in FIG. 1, and a glass tape 15 was abutted thereon. It was wound once to provide ground insulation. After that, it is inserted into the model slot, the same heat-resistant thermosetting non-solvent resin as in Example 1 is injected, vacuum impregnation is performed, and the resin is cured under heating conditions suitable for the impregnated resin, and the insulated wire loop of the rotating electric machine is obtained. Was made. This is designated as Sample D.

The samples A, B, C,
An evaluation test was performed on the four types of insulated wire loops D for withstand voltage deterioration. In the evaluation test, a sample was placed in an atmosphere at a temperature of 180 ° C., a sine wave waveform having a frequency of 1000 Hz and an effective value voltage of 3 kV was applied, and the results until the dielectric breakdown of the sample were compared. .

[0015]

[Table 1]

Table 1 shows the relative life (%) of the evaluation test, the relative insulation thickness (%), and the ratio of life to insulation thickness for each sample. According to Examples 1 and 2 (Samples A and B), Comparative Example 1
The life is greatly increased to 203% and 220% while the insulation thickness increases by 17% as compared with (Sample C). The ratio between the life and the insulation thickness is also increased by about 80% as compared with the sample C, and the effect of the combination is remarkably exhibited. Further, between Comparative Examples 1 and 2 (Samples C and D), the relative life is longer in Sample D, but the ratio between the life and the insulating thickness is rather low because the relative insulation thickness is large.

[0017]

As described above, according to the present invention, an insulating wire having an insulating layer composed of a laminated mica tape and a Kapton CR tape formed by laminating a heat-resistant film and mica paper on the insulating layer, A resin cured by impregnating with a thermosetting non-solvent resin can improve withstand voltage deterioration while minimizing the increase from the conventional insulation thickness.

[Brief description of the drawings]

FIG. 1 is a sectional view of an insulated wire loop of a rotating electric machine according to an embodiment of the present invention.

FIG. 2 is a sectional view of an insulated wire loop of a rotating electric machine according to a second embodiment of the present invention.

FIG. 3 is a sectional view of an insulated wire loop of the rotating electric machine according to Comparative Example 1 of the present invention.

FIG. 4 is a cross-sectional view of an insulated wire loop of a rotary electric machine according to Comparative Example 2 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Winding conductor 11 Wire insulation 12 Polyimide mica tape 13 Kapton CR mica tape 14 Kapton CR tape 15 Glass tape

Claims (2)

[Claims] 1. An insulated wire loop having an insulating layer made of a heat-resistant insulating tape on a conductor is inserted into a core slot portion, and a wedge is incorporated into an upper portion of the slot so that the insulated wire loop is fixed in the slot. In an insulating wire of a rotating electrical machine manufactured by filling and curing a solvent-free heat-resistant resin in an insulating wire or a gap between an insulating wire and an iron core, the insulating layer is formed by laminating a heat-resistant film and mica paper. Insulation of a rotating electric machine characterized by being composed of, for example, a mica tape composed of a polyimide film and a mica paper as a heat-resistant film-mica tape, and a kapton CR tape as a heat-resistant tape containing an inorganic material. Wire loop. 2. The rotation according to claim 1, wherein the heat-resistant film-mica tape comprises a Kapton CR-mica tape obtained by laminating a Kapton CR film and mica paper, and a heat-resistant tape containing an inorganic substance, Kapton CR tape. Electric insulated wire loop.