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SENSORLESS AC MOTOR CONTROLLER

  • US 20130221885A1
  • Filed: 11/01/2010
  • Published: 08/29/2013
  • Est. Priority Date: 11/06/2009
  • Status: Active Grant
First Claim
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1. A controller for an AC electric motor, the controller comprising:

  • i) a Feed Forward Torque Controller which directly derives a torque related component of applied motor voltages from a signal representing a torque command input T* and at least one motor parameter;

    ii) a load model, which derives a motor speed value including a model of motor speed behaviour of the AC electric motor to provide an output signal which represents the motor speed of the AC electric motor for use in determining a frequency of rotation of an applied motor voltage vector and where an input to the load model is the signal representing the torque command input T*, the load model using the signal representing the torque command T*, at least over a part of an operating speed range of the AC motor which includes zero speed, to determine the motor speed output signal.

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