CS218869B1

CS218869B1 - A method of impregnating rotor windings of large electrical machines

Info

Publication number: CS218869B1
Application number: CS795678A
Authority: CS
Inventors: Helfried John; Jorgen Stender
Original assignee: Helfried John; Stender Joergen
Priority date: 1977-12-27
Filing date: 1978-12-01
Publication date: 1983-02-25
Also published as: DD134709A1; DD134709B1

Abstract

Vynález se týká způsobu impregnace vinutí rotorů velkých elektrických strojů - a to výroby elektrických točivých strojů. Účelem vynálezu je vysoce kvalitní,racionálně dosažitelná impregnace vinutí rotorů nebo jiných točivých uzlů. Úkol spočí vá v dokonalém zaplnění všech dutin v dráž kách impregnační pryskyřicí bez použití tlaku a vakua. Při řešení jsou drážky ne zcela zakryty drážkovými klíny. Takto Částečně odkryté drážky se otáčejí ve vaně v syntetické pryskyřici a za dalšího pomalého otáčení rotoru zahřívají shora do želatinování syntetické pryskyřice. Zaplnění syntetickou pryskyřicí a ohřev se opakuje tak dlouho, dokud se drážky zcela nezaplní syntetickou pryskyřicí. Při zvýšených otáčkách na rotor se stří káním nanáší syntetická pryskyřice a nakonec všechna syntetická pryskyřice tuhne působením ohřevu.The invention relates to a method of impregnating rotor windings of large electrical machines - namely the production of electrical rotating machines. The purpose of the invention is high-quality, rationally achievable impregnation of rotor windings or other rotating nodes. The task is to completely fill all cavities in the grooves with impregnating resin without the use of pressure and vacuum. In the solution, the grooves are not completely covered by groove wedges. The partially exposed grooves are rotated in a bath in synthetic resin and, while the rotor is still rotating slowly, they are heated from above until the synthetic resin gels. Filling with synthetic resin and heating are repeated until the grooves are completely filled with synthetic resin. At increased speeds, synthetic resin is sprayed onto the rotor and finally all synthetic resin solidifies under the action of heating.

Description

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Claims

10 OBJECT OF THE INVENTION

A method of impregnating windings of rotors of large electrical machines using wedges enclosing grooves having spaces for passage of the impregnating agent, wherein the respective underside of the rotor rotates slowly in a synthetic resin impregnating tub with high viscosity, liquid at room temperature and curing during heating, characterized in that the penetrating synthetic resin with low surface tension heats up in the respective top of the rotor, wherein the rotor and heating rotations are aligned with the synthetic resin so that it hardens before the groove again reaches the horizontal position, impregnation and heating are repeated until all the grooves are completely filled with synthetic resin, the grooves are then completely covered with grooved dies and applied to the rotor by synthetic resin spraying at the increased speed, and finally all synthetic resin is solidified with oh roar

2. The method of impregnation according to claim 1, wherein, when the grooves are not completely covered with 3 cm gaps, 5 cm long wedges are inserted to cover the grooves and, after filling with grooves with synthetic resin, complementary groove closures on both sides. covering

3. The method of impregnation according to claim 1, wherein, when the synthetic resin is filled with the groove, additional grooves are provided with a longitudinal groove on the inner side for axially distributing the synthetic resin. -Ή

4. The method of impregnation according to claim 1, wherein the amount of synthetic resin applied to the component is controlled by varying the temperature of the impregnating tray.

5. The method of impregnation according to claim 1, wherein the temperature of the synthetic resin is increased by infrared radiation. «E

6. The method of impregnation according to claim 4, characterized in that the synthetic resin, in particular the epoxy resin in general, with a dark dispersion of up to 20%, is electrically insulated with infrared radiation.

7. The method of impregnation according to claim 1, wherein the synthetic resin completely fills the groove, but only partially closes the grooves. Recognized by the invention on the basis of expertise, carried out by the Inventory and Patent Office, Berlin, DD.