Encased electric motor employing gas as heat dissipating means

Details Encased electric motor employing gas as heat dissipating means Encased electric motor employing gas as heat dissipating means

1983-05-02

1984-12-04

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 88, 16510413, H02K 908

Patent

active

044866771

ABSTRACT:
In an encased electric motor within a casing, an electrically insulating varnish is applied by vacuum impregnation to the inside surfaces of the casing and to the outer surface of the stator of the motor. The remaining empty space within the casing is filled with a heat conducting gas mixture comprising approximately 60-90% by volume of helium, with the remaining percentage being an electrically insulating gas having better electrically insulating properties than helium, such as sulphur hexafluoride. This encased motor is much lighter than conventional encased motors in which the stator enclosure is filled with a heat conducting resin potting compound and avoids warping damage which frequently occurs in conventional encased motors due to thermal expansion of the heat conducting resin potting compound.

REFERENCES:
patent: 1543502 (1925-06-01), Hobart
patent: 1914714 (1933-06-01), Gold
patent: 2004866 (1935-06-01), Haldeman
patent: 2128544 (1938-08-01), Surjaninoff
patent: 2727164 (1955-12-01), Radice
patent: 2734459 (1956-02-01), Zimsky
patent: 3229130 (1966-01-01), Drouard
patent: 3240967 (1966-03-01), Krastchew
patent: 3777194 (1973-12-01), Schaefer et al.

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