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Apparatus and method to generate braking torque in an AC drive

  • US 6,417,644 B2
  • Filed: 04/27/2001
  • Issued: 07/09/2002
  • Est. Priority Date: 10/02/1998
  • Status: Expired due to Term
First Claim
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1. A method for producing counter-rotating torque in an AC motor comprising:

  • generating commands in a rotating coordinate system to generate normal and loss-inducing frequency components for said motor;

    converting said commands from said rotating coordinate system to a stationary coordinate system; and

    using said commands to modulate power for said motor, said power having two or more frequency components, at least one of which is a loss-inducing frequency component to produce said counter-rotating torque.

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