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Electric machine

  • US 4,323,803 A
  • Filed: 03/31/1980
  • Issued: 04/06/1982
  • Est. Priority Date: 06/05/1978
  • Status: Expired due to Term
First Claim
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1. An electric machine having a rotor and a stator circumferentially thereof, enclosure means enclosing the electric machine having a compartment divided by the stator into two chambers each on an opposite side of the stator, a jacket extending circumferentially about the rotor isolating the stator thermally from the rotor, said stator having means defining ducts therethrough for flowing a cooling fluid from one chamber to the other through the ducts in the stator, means for effecting a pressure differential of the cooling fluid in the two chambers as a function of a temperature differential and density of the cooling fluid in the two chambers comprising means defining an upward flow path for the cooling fluid above the level of said enclosure and in communication with one of said two chambers and a downward flow path for the cooling fluid above the level of the enclosure, in communication with the other chamber, and a cooler in a flow path between the upward and downward flow paths for selectively cooling the cooling fluid.

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