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System and method for transient-based motor speed estimation with transient excitation

  • US 7,227,326 B1
  • Filed: 04/24/2006
  • Issued: 06/05/2007
  • Est. Priority Date: 04/24/2006
  • Status: Active Grant
First Claim
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1. An AC motor control system for operating an AC induction motor, the motor control system comprising:

  • a switching system including a plurality of switching devices coupled between an AC power source and an induction motor, the individual switching devices operative to selectively couple a corresponding motor lead to the AC power source according to a corresponding switch control signal;

    a motor controller providing a motor controller output to control the motor speed during starting or stopping according to a desired speed profile and according to a rotor speed estimate;

    a switch control system providing a plurality of switch control signals to control operation of the switching devices of the switching system during starting or stopping of the motor according to the controller output;

    a transient excitation system operatively coupled with the switch control system to selectively modify at least one switch control signal to excite a motor transient; and

    a transient-based speed estimation system operatively coupled with the switching system and the motor speed control system, the transient-based speed estimation system receiving at least one feedback signal or value from the switching system and providing the rotor speed estimate at least partially according to the feedback signal or value.

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