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Liquid Cooled Rotor Assembly

  • US 20090121563A1
  • Filed: 12/20/2008
  • Published: 05/14/2009
  • Est. Priority Date: 05/01/2007
  • Status: Active Grant
First Claim
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1. A method of cooling an electric motor in an electric vehicle, said method comprising of the steps of:

  • rotating a rotor shaft of the electric motor at a shaft rotation rate, said rotor shaft comprised of an open end located at a first end of said rotor shaft and a closed end located at a second end of said rotor shaft;

    rotating a coolant feed tube extending through said open end of said rotor shaft and positioned within a hollow portion of said rotor shaft at a tube rotation rate, wherein said tube rotation rate is equivalent to said shaft rotation rate; and

    pumping a coolant through a coolant inlet located at a first end of said coolant feed tube, through said coolant feed tube, out of a coolant outlet located at a second end of said coolant feed tube, through a coolant flow region between an outer surface of said coolant feed tube and an inner surface of said hollow portion of said rotor shaft, and through said open end of said rotor shaft.

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