JPS5854609A - Insulating method for coil used on electric machine - Google Patents

Abstract

PURPOSE:To increase the mechanical strength and the dielectric strength of the titled coil by a method wherein a solution, which was made by mixing a silicon compound, dehydrated mica glass and inorganic fibers and diluted by an organic solvent, is impregnated and hardened on the coil on which an insulated wire was wound around. CONSTITUTION:A solution, wherein a silicon compound, dehydrated mica glass and inorganic fibers are mixed and diluted by an organic solvent, is impregnated and hardened on the coil 1 whereon an insulated wire was wound around. As a result, the dielectric strength and the mechanical strength of the coil can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for insulating electric equipment coils that can withstand high temperature atmospheres of 300'C or higher.

The method of insulating wires in conventional rotating machines is to naturally insulate them along the inner surface of the slot that houses the wires! An insulating layer of squid-based tape or sheet is brought into contact with the insulating layer, a wire-wound conductor made of insulated wire is inserted into the insulating layer, and the wafer is inserted into the insulating layer. This was done by impregnating a liquid in which natural aggregated mica was suspended, and filling the spaces between the winding conductors and the insulation layer. However, in this method, if the wire in a rotating machine or the like is placed in a high-temperature atmosphere exceeding 300°C, the silicone organic compound will deteriorate due to heat, and the adhesive strength between the filling insulator and the winding insulating layer will be lost. At the same time, there is a drawback that the mechanical strength and dielectric strength are reduced due to the formation of particles in the filling insulator.

Therefore, the present inventor has completed the present invention as a result of repeated research into an insulation method that does not have these drawbacks, maintains mechanical strength even at high temperatures, and does not reduce dielectric strength.

The present invention involves kneading (1) a cone compound, devitreted mica glass, and inorganic fibers onto a wire wound with an insulating layer (m), and impregnating and hardening the mixture with a solution diluted with an organic solvent. This is a method of insulating electrical wires that has thermal stability and does not reduce mechanical strength and electrical dielectric strength.

The silicone organic compounds used in the present invention are organopolysiloxanes, and silicone resins with a relatively low degree of polymerization are good in terms of workability and affinity. You can use either.

Devidorized mica glass is 20, MgO.

Mg F2 , S, 02 wo blend L1 Melt q t melted at 300°C or above, glass body cooled to ooo°C, and is a devitreted glass in which 451 potassium tetrasilicon mica is precipitated in the glass body. It is preferable to use finely pulverized mica glass of approximately 325 mesh or less.

The organic solvent used in the present invention is xylene, butyrosolve, and preferably cellosolve acetate or a mixture thereof.

The inorganic fibers are fibrous materials such as asbestos and ceramic fibers, and relatively long fibers are used. Preferably, a material containing at least 10% of fibers with a diameter of about 1 μm and a length of 0.1 m or more is used.

In the present invention, in order to prepare an insulating impregnating agent which is a diluted solution of a silicone organic compound, devitlated mica glass, and inorganic fiber in an organic solvent, the above-mentioned silicone organic compound, devitlated mica glass, and inorganic fiber are mixed in a weight ratio of approximately 1.
: 0.5: Knead at a ratio of 0.5 or more, dilute this with an organic solvent, and then mix. In this case, a trace amount of a dividing agent may be added.

The thus obtained insulating impregnating agent is impregnated around the wound wire by an appropriate means such as dipping, injection, coating, etc., and heated to about 200° C. or higher to harden the composition around the wire. Thus, the cured insulation impregnating agent must be further heated to 300°C or higher or used in an atmosphere at a high temperature of 300"C or higher, since the devitreted mica glass contains tetrasilicon mica containing glass. As a result, some fluorine compounds such as S, F4, KF, etc. vaporized from the potash tetrasilicon mica of mica glass dissolve amorphous S and OZ decomposed from silicone organic compounds and turn into yaramisoku. The vitreous substance contained in mica glass forms a solid solution of the silicone organic compound, fibers, and glass (15).The fibers have an intertwined structure, and are separated by the equipment's recycling cycle and mechanical infiltration. It has a trapping effect on the stress generated.Furthermore, there is no decrease in mechanical strength due to thermal deterioration, and no cracks occur in the impregnated cured product.Also, an excellent insulated wire ring with no decrease in electrical dielectric strength can be obtained. It will be done.

As a demonstration of the effects of the method of the present invention, there is a difference between the insulated wire shaft obtained by the method of the present invention and the conventional insulated wire shaft impregnated with a static suspension consisting of a silicone organic compound and natural aggregated mica. The table below shows the results of comparative tests regarding the dielectric strength between the two and the ground, and the presence or absence of cracks in the impregnating agent.

Table (Unit: KV) As described above, the insulated wire shaft insulated by the present invention is 40
It has excellent dielectric strength and mechanical strength even under severe conditions of 1,500 hours at 0°C.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.

In the embodiment slot 2 is a double-sided glass sheet assembled mica sheet.
Correlation #@ consisting of ground insulating paper 3 and laminated mica board
The iron core 1 into which the edge paper 4, the winding assembly 6, and the wafer 5 are inserted is preheated at 120° C. to remove moisture from each material.

After that, it is cooled to 40-50°C. This iron core is heated and dried for 2 hours with silicone oil and 325 m2 or less to volatilize the solvent, and further heated at 200° C. or higher for 2 hours or more to harden and insulate the motor coil.

Although this embodiment has been described for insulating the winding conductor of a rotating electrical machine, it can also be used for winding conductors of transformers and the like.

[Brief explanation of the drawing]

The drawing is a cross-sectional view of an insulated cylindrical ring according to the present invention. 1: Iron core, 2 Nislot, 3: Ground insulation paper, 4: Correlation/insulation paper, 5: Wafer,
6: Winding conductor, 7: Insulating impregnating agent Patent applicant Yaskawa Electric Co., Ltd. Representative Ito Nada (and 1 other person)

Claims (1)

[Claims] 1. Insulation of electrical equipment wires, which is characterized by kneading a silicone compound, devitroized mica glass, and inorganic fibers into a wire wire wound with insulated wire, and impregnating and curing the mixture diluted with an organic solvent. Method.