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Drive system

  • US 6,531,795 B2
  • Filed: 04/30/2002
  • Issued: 03/11/2003
  • Est. Priority Date: 06/15/1999
  • Status: Expired due to Fees
First Claim
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1. A drive system for a motor vehicle, comprising:

  • a drive shaft arranged for rotating about an axis of rotation;

    an electric machine having a stator arrangement and a rotor arrangement rotatable relative to said stator arrangement for rotation about said axis of rotation with said drive shaft, said rotor arrangement having permanent magnets, wherein said electric machine is selectively operable as a motor for producing a torque for rotating said drive shaft and as a generator for obtaining electric energy from rotation of the drive shaft; and

    a heat transfer arrangement operatively arranged for conducting a heat transfer fluid in a closed loop for selectively adding heat to said rotor arrangement for heating said rotor arrangement to a desired operating temperature range of said rotor arrangement and maintaining said rotor arrangement at said desired operating temperature, wherein said desired operating temperature of said rotor arrangement is approximately 10-50°

    C. below a temperature at which an irreversible impairment of a magnetization of the rotor arrangement occurs.

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