Spark protected alternator

Details Spark protected alternator Spark protected alternator

1994-09-06

1995-06-13

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 59, 310 88, H02K 906, H02K 1100

Patent

active

054246008

ABSTRACT:
An explosion-proof type rotating electrical machine having excellent cooling and brush powder discharge capabilities. A drive shaft of a rotor is provided with slip rings for supplying current to a field coil, which is energized through brushes capable of activating the field coil by contacting with the slip rings. The brush compartment incorporated with the brushes and slip rings and the outside of the rotating electrical machine are connected with each other through an air suction path, the brush compartment and an inside space of the rotating electrical machine are connected with each other through an air blowing path, in which a flame stifling wire net is provided. When operating the rotating electrical machine in a flammable gas atmosphere, sparks generated due to a contact failure between the brushes and the slip rings ignite the flammable gas filled in the brush compartment to produce flames, the flames then reach the flame stifling wire net by a blowing cool air sucked from the air suction port, where the flames are cooled and extinguished by the flame stifling wire net. Brush powders are discharged to the outside of the brush compartment from the air blowing path by the cooling air.

REFERENCES:
patent: 2323146 (1943-06-01), Manney
patent: 2542016 (1951-02-01), Else et al.
patent: 2594003 (1952-04-01), Else et al.
patent: 2736826 (1956-02-01), Hoover
patent: 2991377 (1961-07-01), Vose et al.
patent: 3666978 (1972-05-01), Renner
patent: 4680495 (1987-07-01), Chiampas et al.
patent: 5317224 (1994-05-01), Ragaly
Journal of Nippondenso Technical disclosure No. 39-109, Jan. 1985.
Journal of Nippondenso Technical Disclosure No. 65-207, May 1989.

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