JP2604651Y2 - Stator coil of rotating electric machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a stator coil of an AC rotary electric machine, and more particularly to a pre-treated exterior coil in which a coil exterior tape is immersed in a dilute varnish solution diluted with a solvent such as toluene or xylene. The present invention relates to a stator coil using tape.

[0002]

2. Description of the Related Art A conventional stator coil of a rotating electric machine is shown in FIG.
As shown in the figure, an insulating layer 2 formed by winding a mica tape several times around the flat coil wire 1 and filling it with an upper varnish for insulation is provided as shown in FIG. After insertion into a slot (not shown), a thermosetting solvent-free varnish is generally impregnated with a vacuum and then heated to be cured and manufactured. As the exterior tape 3 ', a tetron tape woven with tetron fiber or a glass tape woven with glass fiber is preferably used.

[0003]

The thermosetting solvent-free varnish impregnated in the coil insulating layer by the above-mentioned vacuum pressure impregnation method becomes gelled and hardens when the temperature rises in the process of hardening by heating. Once the viscosity decreases. At this time, the varnish whose viscosity has been reduced flows out through the eyes of the cloth of the exterior tape 3 ', voids (voids) 5 are generated inside the insulating layer 2, and partial discharge occurs during operation of the electric motor, thereby causing the insulating layer to be damaged. There is a disadvantage that the life is shortened due to deterioration.

[0004]

In the present invention, after immersing the exterior tape in a solution obtained by diluting the varnish with a solvent such as toluene or xylene, the varnish is dried and pre-treated to cure the varnish adhered thereto. The above problem was solved by performing exterior taping.

[0005]

[Function] Since the varnish diluted with the solvent adheres to the tape to the extent that the outer tape is clogged, the tape has flexibility and does not hinder taping work.
In the impregnation process using the vacuum pressure impregnation method, the tape has enough permeability to the thermosetting non-solvent varnish, and in the next heating process, the varnish impregnated into the insulating layer does not flow out under normal pressure. Can be formed, and an insulating layer in which voids are not generated due to outflow of varnish can be formed.

[0006]

FIG. 1 is a schematic sectional view of an induction motor stator coil according to the present invention. The outer tape 3a wound around the outer periphery of the insulating layer 2 may be the aforementioned tetron tape or glass tape. Same as before, but as a pretreatment, a varnish is diluted with a solvent such as toluene or xylene, for example, to a solution obtained by diluting (varnish) :( solvent) = 1: 2-1: 4 by weight for about 30 minutes. After immersion, the varnish is hardened by air drying or heat drying for about 3 hours. Except for performing this pre-processing, it is completely the same as the conventional one.

The varnish diluted as described above does not lose its flexibility because it adheres only to the degree of clogging of the exterior tape 3a, does not hinder the taping operation, and also performs vacuum and subsequent pressurization. Has a sufficient permeability for impregnation of a thermosetting solvent-free varnish, and the tape 3a is clogged to such an extent that the varnish does not flow out in the heating step. Can be prevented.

[0008]

As described above, since no gap is formed in the insulating layer of the coil, partial discharge is prevented, and the life of the coil can be extended since the insulating layer does not deteriorate.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of an induction motor stator coil according to the present invention.

FIG. 2 is a schematic sectional view of a conventional induction motor stator coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coil wire 2 Insulating layer 3a Exterior tape 5 Air gap

Continuing on the front page (72) Inventor Noriichi Naito 150 Motoyashiki, Miyakomachi, Toyohashi-shi, Aichi Prefecture Shinko Electric Co., Ltd. Inside Toyohashi Manufacturing Co., Ltd. (56) References JP-A-62-135243 (JP, A) JP-B-54-35662 (JP, B2) ・ Polymer Society, “Polymer Dictionary”, first edition, Asakura Shoten Co., Ltd. , June 30, 1971, p. 607 ・ Plastic Section, Osaka Municipal Industrial Research Institute, “Practical Plastics Glossary”, 2nd edition, Plastics Age, Inc., June 20, 1970, p. 460 ・ Shin Ogawa, “English-Japanese Plastics Industry Dictionary, Fifth Edition, First Printing, Industrial Research Institute, Inc., June 1, 1989, pp. 766-767 (58) Fields surveyed (Int. Cl. ⁷ , DB (Name) H02K 15/12 H02K 3/34

Claims (2)

(57) [Scope of request for utility model registration] 1. A mica tape is wound around an outer periphery of a coil wire several times as a main insulating layer, and an outer tape such as a tetron tape or a glass tape is wound around the outer periphery once.
After thermosetting solventless varnish after insertion into the core slot is immersed vacuum press 圧含, in the stator coil of the rotating electric machine to be molded is heated and cured, the exterior tape, said thermosetting solventless varnish Immerse in a solution diluted with a solvent such as toluene or xylene.
And after pretreatment curing the varnish adhered performing drying is performed, and low viscosity in the course of heat curing
A stator coil for a rotating electrical machine, wherein the varnish is prevented from flowing out through an exterior tape to prevent a void from being formed in the coil insulating layer. 2. A solution obtained by diluting the varnish with a solvent,
A stator coil for a rotating electric machine, wherein the weight ratio of the varnish and the solvent is in the range of 1: 2 to 1: 4.