Air-cooled rotating electrical machine

Details Air-cooled rotating electrical machine Air-cooled rotating electrical machine

1994-09-15

1996-09-17

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 58, 310 63, H02K 926, H02K 900, H02K 906

Patent

active

055571530

ABSTRACT:
In order to cool a rotating electrical machine having an open cooling circuit, mechanically filtered environmental air is normally passed through the cooling ducts in the stator and rotor and the machine air gap (22) by means of fans (15) which are arranged on both ends of the rotor shaft. If the air which is taken from the environment is contaminated with hazardous materials, it is proposed to supply the prefiltered air directly to the stator and the machine air gap and to subject only the cooling air which is to be supplied to the rotor to refiltering in an activated charcoal filter (30). In this case, the mechanically filtered cooling air which is to be supplied to the stator and possibly the machine air gap is passed through the fans, while the refiltered cooling air which is to be supplied to the rotor is passed into the rotor on a separate route. The cooling air for the rotor is in this case preferably conveyed by the rotor's own ventilation. In this way, the investment costs for the subsequent filters are reduced while only a fraction of the required quantity of air still needs to be refiltered.

REFERENCES:
patent: 3566168 (1971-02-01), Matsubara
patent: 3643119 (1972-02-01), Lukens
patent: 3840762 (1974-10-01), Kasabian
patent: 4273674 (1981-06-01), Ligon, Jr. et al.
patent: 4314831 (1982-02-01), Barbic
patent: 4399378 (1983-08-01), Krumm et al.
patent: 4496862 (1985-01-01), Weber
patent: 4531070 (1985-07-01), Kuhn
patent: 4625133 (1986-11-01), Lobsinger
patent: 4682064 (1987-07-01), Crounse et al.
patent: 5276373 (1994-01-01), Zimmerman et al.
patent: 5424593 (1995-06-01), Vaghani et al.
Luftgekuhlte Turbogeneratoren der 200-MVA-Klasse. In: Brown Boveri Technik 3-86, S. 133-138.

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