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Apparatus and method for controlling transition between PWM and linear operation of a motor

  • US 5,723,963 A
  • Filed: 06/07/1995
  • Issued: 03/03/1998
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A motor drive control system for operation in both linear and PWM modes with minimized effect of transients upon transitions between modes, comprising:

  • a drive circuit for supplying energizing current to motor coils during a first set of time intervals in the linear mode and during a second set of time intervals, that occur between the intervals of the first set, in the PWM mode;

    said drive circuit including a compensation network that is switchably connected in the drive circuit during intervals of linear mode operation and not during periods of PWM mode operation.

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