SU748680A1 - Method of manufacturing electric machine winding insulation - Google Patents

Description

The purpose of the invention is to obtain insulation with high heat resistance, electrical and mechanical strength and heat through the air, improvement of the technological process of manufacturing windings. This goal is achieved by the fact that in the method of manufacturing the insulation of the windings of electrical machines, including the imposition on the elements of the windings impregnated with a heat-resistant binder electrically insulating material, in which the thermo-active binder is in a non-curing valuable condition, and after the impregnation of the winding under vacuum and pressure : low viscosity composition of lower heat resistance with high viability prior to impregnation, hot pressure testing of at least part of the winding at temperature and pressure is carried out, ensuring polymerization of the binder in the specified material to the state limiting the penetration of the less heat-resistant impregnating composition into the optimal part of the winding. At the same time, a composition based on epoxy resin resins is used as a thermosetting binder, a composition based on epoxy diane skula is used as a low viscosity composition, and hot pressure testing is performed at 100-18 ° C and a pressure of 3-10 kgf / cm for 5 -30 min. In addition, a composition based on modified silicone resins is used as a thermosetting binder, using a composition based on epoxy resin dianes as a low viscous composition, and hot pressing is performed at 120–220 0 and pressure 510 kgf / cm for 5-20 min. The variation of temperature and pressure in a fairly wide range is due to the fact that the winding elements have different sizes, and the pressure forcing allows the temperature to decrease in a number of cases. Crimping makes it possible to optimize the ratio of heat-resistant and less heat-binding due to the parts of the winding that are subjected to the greatest heating in operation, which leads to an increase in the overall heat-resistance of the insulation system and its electrical characteristics. In this method of manufacturing windings of electric machines, it is possible to use heat resistant, highly viscous binders, such as epoxy-xenon-resin resins, which are previously inserted into tapes and which cannot be used to impregnate dry porous insulation; vacuum-injection method due to their high liquidity and short life span. The impregnation of the winding after laying in the grooves can be carried out with low viscosity compositions of lesser heat resistance, but with a long LIFE, for example, compositions based on diane epoxy resin and anhydrite oxide layer. The penetration of a less heated, resistant, impregnated compound into the pressed parts of the winding is difficult; in connection with the partial polymerization of the binder in these parts. With the proposed method of manufacturing & isolation, the process of vacuum-pressure impregnation is simplified, since the depth of vacuum and the amount of overpressure can be reduced and the impregnation time is reduced to fill the voids in the grooves and gaps in the insulation from the impregnated tapes. Example 1. Dummies — copper rods imitating winding elements, 6 × 3 × 5OO mm in size, are insulated with glass fiber sludge tape containing 36-38% uncured epoxy binder (epoxy-sintered UP643 resin and hardener (boron trifluoride complex with mono-ethylaminomer). continuous isolation of a full-length with a calculated thickness of 1 mm per side. The middle part of the layouts over a length of 2OO was pressed at 16 ° C and a pressure of 10 kgf / cm for 30 minutes. The isolated rods were impregnated under vacuum and pressure with a compound on the basis of epoxy resin Dianova ED-22 and IMTHPA {isometIltetrahydrophthalic angipri) in a ratio of 1OO-80 weight. (residual pressure at impregnation of the order of 0.5 mm Hg. Art., pressure on the compound is 2 kgf / cm and heat treated for IQ at. Insulation obtained with the characteristics shown in Table 1. For comparison, the characteristics of the non-impregnated isolate are given. The compressed part of the layouts has a higher dielectric strength and lower dielectric loss and the percentage of binder compared to the unpressed parts of the layouts. Example 2. On samples of isolation layouts made in example 1, followed by thermal stabilization tion of

properties at 200 ° C for 12 h, the mass loss of the liquid in the heating process up to 500 ° C with the rate of sSrC / MHH by thermogravimetric method is determined (see, Table 2).

In the case of manufacturing the insulation according to the proposed method with pre-pressing a part of the winding, the insulation has less mass loss.

Example 3, Dummies — copper rods with dimensions of 6хЗх5ОО mm, imitating winding elements, are insulated with a steklo-mica tape containing 33-36% of uncured modified organosilicon compound i, which is a mixture of methylphenylvinylsiloxane oligomer (up to 90%), epoxy resin, EDD-EDA, a mixture of methyl phenylvinylsiloxane oligomer (up to 90%), 1%) and curing initiator - perkncy dykumila (up to 1.5%). Tape inflicts

c in the form of continuous insulation with a full thickness with a calculated thickness of I mm. The middle part of the layouts at a length of 2PO mm is pressurized at a pressure of 5 kgf / cm for 1 O min. Insulated rods impregnated under vacuum; and pressure compounded on the basis of epoxy resin Dianova ED-22 and IMTHPA in a ratio of 1OO: 80. weight. hours (residual pressure at impregnation of 0.5 mm Hg. pressure on the compound 2 kgf / cm) and processed for 16 hours at 15 ° C

Received nsollschi with the characteristics given in table. 3

In the case of manufacturing the insulation according to the proposed method, the insulation material has a higher heat resistance and better dielectric properties.

Table 1

0.4

0.8

1.6

4.8

1O, O

14.0

20.0

27.2

30.0

table 2

Oh 8

1.7 5.0 1O, O 20.0 23.75 30.0 39.6 50, O

Claims (3)

Opressovanya Formula in the image of t and n and t. A method of making insulation on the cheeks of rth machines of a machine, in which it is applied to the elements of the winding impregnated with a heat-resistant binder, in which the thermo-binding material is in a non-cured state and after it has been applied, in order to get a pattern in order with great vitality, characterized in that, in order to increase the bone heat resistance, heat and electrical characteristics of the insulation, pepper impregnation produces a hot scoop at least part of the winding determined at a temperature and pressure that ensure yuyu partial polymerization of the binder in the Material SHI Set up condition to restrict conductive heat resistance less penetration of the impregnating composition in the molded-part winding. 2. The method according to p. 1, about t l and tea and with the fact that as thermorea Table 3 of the active binder uses a composition based on epoxy-resin resins, docTaB based on epoxy resins dianes are used as a low composition, and hot pressing is carried out at 100-. and pressure of 3-10 kgf / cm for 5-30 minutes. 3. The way according to. Clause 1, which differs from and in that, as a thermosetting binder, a composition based on modified organosilicon resins is used as a low-strength one. The composition is based on a composition based on epoxy resin dianov, and hot pressure testing is performed at 120-220 ° C and pressure 5-10 kgf / cm for 52 minutes. Sources of information taken into account during the examination 1. USSR author's certificate No. 262323, cl. 21 d .53, 1966. 2. Author's certificate of the USSR K9 240082, cl. 21 d, 53, 1964. 3. Accepted for Japan No. 52-3441, cl. 55 A O1, published. 1977 (prototype).