Liquid cooled asynchronous electric machine
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United States of America Patent
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-
Feb 20, 2001
Grant Date -
N/A
app pub date -
Sep 27, 1999
filing date -
Sep 28, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In order to assure efficient cooling and a temperature balance between the stator and the rotor, an asynchronous electric motor is provided containing a closed cooling liquid circuit which passes successively into the stator (1) and into the shaft (3) of the rotor, over the entire length of the stator and the rotor. A pump (15) is incorporated in the rotor shaft. The liquid is injected into the pump by a stationary axial tube (16) and comes out again between the shaft and this tube. The pump includes a centrifugal pumping member (20) fixed to the bottom of the bore of the shaft, and longitudinal-blades (21) fixed to the shaft facing an external helicoid rib (17) of the injection tube. The liquid is cooled by the ambient air along the periphery of the stator.
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