Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
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.
Inao Hiroshi
Ishikawa Takatoshi
Nishida Mitsuhiro
Sakabe Shigekazu
Tokumitsu Kiyonori
Mitsubishi Denki & Kabushiki Kaisha
Skudy R.
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