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Active reduction of torque irregularities in rotating machines

  • US 6,326,750 B1
  • Filed: 12/14/1999
  • Issued: 12/04/2001
  • Est. Priority Date: 06/17/1999
  • Status: Expired due to Term
First Claim
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1. A control system for providing smooth output torque comprising:

  • a rotating electromagnetic machine, the machine including a stator, a plurality of stator windings positioned within the stator, and a rotor that tends to prefer certain angular positions with respect to the stator over other positions;

    a rotor position detector that provides a rotor position signal indicative of the angular position of the rotor with respect to the stator; and

    a controller coupled to the stator windings, the controller operating in a rotating reference frame and receiving as inputs an input command signal and the rotor position signal and providing in response to the inputs electric power to energize the stator windings, the controller comprising;

    a torque control circuit that receives the input command signal and generates a machine energization signal corresponding to the input command signal;

    a torque rejection signal that receives as an input the rotor position signal and generates a torque rejection signal corresponding to the tendency of the rotor to prefer the angular position corresponding to the received rotor position signal; and

    energization circuitry for energizing the stator windings in response to the torque command signal and the torque rejection signal to provide smooth output torque.

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