Device for impregnating an insulation of a winding bar of an electrical machine
View Patent ↗A device for impregnating an insulation of a winding bar of an electric machine includes a container accommodating the winding rod and connected to a tank containing an impregnation agent. The container, which remains open during the impregnation process, is surrounded by an evacuation container to create a negative pressure within the container. To achieve a more rapid penetration of the impregnation agent and to simplify the overall process, a vacuum-tight sleeve acts as the container, the sleeve being encompassed by a pressure-resistant sleeve, and a conduit of an assembly that generates a vacuum leads into the interior of the sleeve. The impregnation agent is supplied with a pressure that is lower than the prevailing pressure in the pressure-resistant sleeve. The container can be a multi-part tool defining an interior for surrounding and accommodating the winding bar in a positive fit at least during an evacuation and impregnation process.
1. A device for impregnating an insulation of a winding bar of an electrical machine, comprising:
a multi-part tool defining an evacuable interior to surround and accommodate the winding bar in a positive fit at least during an evacuation and impregnation process, said multi-part tool formed of all rigid parts;
a tank holding an impregnating agent at a predetermined pressure, said tank fluidically connected to said interior for supplying the impregnating agent to said interior at the predetermined pressure; and
a vacuum line fluidically connected to said interior for supplying a vacuum to said interior.
2. The device according to claim 1 , wherein the winding bar is a current heater and a resistance of said current heater represents a measure of a temperature of said current heater.
3. The device according to claim 1 , wherein said multi-part tool maintains an overpressure during an impregnation process at least until the impregnation agent jellifies and hardens.
4. The device according to claim 1 , wherein the impregnation agent is a resin that hardens at room temperature.
5. The device according to claim 1 , wherein the insulation is at least one insulating tape containing accelerating additives.
6. A device for impregnating an insulation of a winding bar of an electrical machine, comprising:
a multi-part tool having an evacuable interior to surround and accommodate the winding bar in a positive fit at least during an evacuation and impregnation process, said multi-part tool formed of only rigid parts;
a tank holding an impregnating agent at a predetermined pressure, said tank fluidically connected to said interior for supplying the impregnating agent at the predetermined pressure; and
a vacuum-forming device fluidically connected to said interior for supplying a vacuum to said interior.
7. A device for impregnating an insulation of a winding bar of an electrical machine, comprising:
a multi-part tool having at least first and second parts defining an evacuable interior and displaceable with respect to one another to surround and accommodate the winding bar in a positive fit at least during an evacuation and impregnation process, said first and second parts being rigid parts;
a tank holding an impregnating agent at a predetermined pressure, said tank fluidically connected to said interior for supplying the impregnating agent at the predetermined pressure; and
a vacuum-forming device fluidically connected to said interior for supplying a vacuum to said interior.