Electric propulsion units
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United States of America Patent
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Mar 6, 2007
Grant Date -
Mar 18, 2004
app pub date -
Jul 29, 2002
filing date -
Aug 6, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A propulsion unit for propelling a waterborne vessel includes an electric motor arranged to provide propulsion, and a housing arranged to contain the motor. The interior of the housing is maintained at an increased pressure of above roughly 2 bar to increase the cooling effect of a cooling gas maintained therein. An end region of the housing is provided with a heat exchange mechanism arranged to cool a cooling gas passing thereover. The heat exchange mechanism is associated with the housing such that, in use, water surrounding the housing absorbs heat therefrom.
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