Controller and control method for rotary electric machine
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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Abstract
A control unit applied to a motor that includes a rotor having a field winding and a rotor having armature winding groups to control a field current passed through the field winding. Each of the armature winding groups is applied with a prescribed voltage. The field current is controlled so as to be a minimum field current value If_min with which a deviation between an amplitude of an induced voltage generated in the armature winding groups by rotation of the rotor, and an amplitude of the voltage applied to the armature winding groups becomes equal to or smaller than a prescribed value.
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Citations
18 Claims
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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, and when 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A control method for a rotary electric machine, the control method being applied to 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 method comprising:
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selecting, via a processing unit, one of a first field current and a second field current larger than the first field current as a field current target value; and controlling, via the processing unit, 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, and when 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 a 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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Specification