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Flux weakening AC motor control by voltage vector angle deflection

  • US 9,614,473 B1
  • Filed: 12/24/2015
  • Issued: 04/04/2017
  • Est. Priority Date: 12/24/2015
  • Status: Active Grant
First Claim
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1. A method for controlling a three phase AC motor, comprising:

  • generating an operating point error signal based upon a difference between a reference operating point of the AC motor and an actual operating point of the AC motor;

    using a first control method to determine a first three phase motor control vector from the operating point error signal, whereby magnitude and angle values of the first three phase motor control vector are determined;

    using a second control method to determine a second three phase motor control vector from the operating point error signal, whereby the second three phase motor control vector is a voltage vector with a constant magnitude and only an angle value of the second three phase motor control vector is controlled; and

    applying a pulse width modulated voltage to the AC motor,wherein the pulse width modulated voltage is dependent upon the first three phase motor control vector when the AC motor is operating below voltage output saturation, andwherein the pulse width modulated voltage is dependent upon the second three phase motor control vector when the AC motor is operating at voltage output saturation.

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