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Controller and control method for rotary electric machine

  • US 9,847,744 B2
  • Filed: 10/21/2015
  • Issued: 12/19/2017
  • Est. Priority Date: 10/21/2014
  • Status: Active Grant
First Claim
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1. A control apparatus for a rotary electric machine, comprising:

  • a control unit coupled with a rotary electric machine which comprises a rotor having a field winding and a stator having an armature winding to control a field current passed through the field winding, the control unit comprising;

    a memory for storing a program; and

    a processing unit communicable to the memory and configured to execute the stored program,the processing unit being configured to;

    select one of a first field current and a second field current larger than the first field current as a field current target value; and

    control the field current passed through the field winding, based on the field current target value, wherein;

    when a current passing through the armature winding is represented, in a dq axis coordinate system, by a current vector that is a combination of a d axis current and a q axis current, a voltage limit circle being an arcuate locus of the current vector where an amplitude of an applied voltage of the armature winding has a constant value, andwhen a magnitude of the d axis current at the right end of the voltage limit circle is equal to or larger than 0,the processing unit calculates the first field current with which a deviation between an amplitude of an induced voltage generated in the armature winding by rotation of the rotor and an amplitude of the applied voltage of the armature winding becomes equal to or smaller than a prescribed value, and selects the first field current as the field current target value.

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