Motor control apparatus
First Claim
1. A motor control apparatus comprising:
 a fundamental wave current control system that controls a fundamental wave component of a motor current in an orthogonal coordinate system which hypothetically rotates in synchronization with a rotation of a 3phase AC motor;
a higher harmonic current control system that controls a higher harmonic component contained in the motor current in an orthogonal coordinate system hypothetically rotating with a frequency which is an integral multiple of the frequency of the fundamental wave component of the motor current;
a voltage command value generating device that generates 3phase AC voltage command values by adding an output from said fundamental wave current control system and an output from said higher harmonic current control system;
a power conversion device that converts a DC source voltage to a 3phase AC voltage corresponding to the 3phase AC voltage command values and outputs the 3phase AC voltage to the 3phase AC motor;
a voltage saturation detection device which detects that an output voltage from said power conversion device is in a saturated state; and
a gain adjustment device that reduces a current control gain for said higher harmonic current control system if said voltage saturation detection device detects an output voltagesaturated state.
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Abstract
A motor control apparatus comprises a fundamental wave current control system that controls a fundamental wave component of a motor current in an orthogonal coordinate system which rotates in synchronization with a rotation of a 3phase AC motor, a higher harmonic current control system that controls a higher harmonic component contained in the motor current in an orthogonal coordinate system rotating with a frequency which is an integral multiple of the frequency of the fundamental wave component of the motor current, a voltage command value generating device that generates 3phase AC voltage command values by adding an output from the fundamental wave current control system and an output from the higher harmonic current control system, a power conversion device that converts a DC source voltage to a 3phase AC voltage corresponding to the 3phase AC voltage command values and outputs the 3phase AC voltage to the 3phase AC motor, a voltage saturation detection device which detects that an output voltage from the power conversion device is in a saturated state and a gain adjustment device that reduces a current control gain for the higher harmonic current control system if the voltage saturation detection device detects that an output voltage is in a saturated state.
25 Citations
9 Claims

1. A motor control apparatus comprising:

a fundamental wave current control system that controls a fundamental wave component of a motor current in an orthogonal coordinate system which hypothetically rotates in synchronization with a rotation of a 3phase AC motor;
a higher harmonic current control system that controls a higher harmonic component contained in the motor current in an orthogonal coordinate system hypothetically rotating with a frequency which is an integral multiple of the frequency of the fundamental wave component of the motor current;
a voltage command value generating device that generates 3phase AC voltage command values by adding an output from said fundamental wave current control system and an output from said higher harmonic current control system;
a power conversion device that converts a DC source voltage to a 3phase AC voltage corresponding to the 3phase AC voltage command values and outputs the 3phase AC voltage to the 3phase AC motor;
a voltage saturation detection device which detects that an output voltage from said power conversion device is in a saturated state; and
a gain adjustment device that reduces a current control gain for said higher harmonic current control system if said voltage saturation detection device detects an output voltagesaturated state.  View Dependent Claims (2, 3, 4, 5, 6, 7)


8. A motor control apparatus comprising:

a fundamental wave current control system that controls a fundamental wave component of a motor current in an orthogonal coordinate system which hypothetically rotates in synchronization with a rotation of a 3phase AC motor;
a higher harmonic current control system that controls a higher harmonic component contained in the motor current in an orthogonal coordinate system hypothetically rotating with a frequency which is an integral multiple of the frequency of the fundamental wave component of the motor current;
a voltage command value generation means for generating 3phase AC voltage command values by adding an output from said fundamental wave current control system and an output from said higher harmonic current control system;
a power conversion means for converting a DC source voltage to 3phase AC voltage corresponding to the 3phase AC voltage command values and outputs the 3phase AC voltage to the 3phase AC motor;
a voltage saturation detection means for detecting that an output voltage from said power conversion means is in a saturated state; and
a gain adjustment means for reducing a current control gain for said higher harmonic current control system if said voltage saturation detection means detects that an output voltage is in a saturated state.


9. A motor control method adopted in a control system having a fundamental wave current control system that controls a fundamental wave component of motor currents in an orthogonal coordinate system hypothetically rotating in synchronization with the rotation of a 3phase AC motor and a higher harmonic current control system that controls a higher harmonic component contained in the motor currents with an orthogonal coordinate system hypothetically rotating with a frequency which is an integral multiple of the frequency of the fundamental wave component of the motor currents, in said control system 3phase AC voltage command values is generated by adding an output from said fundamental wave current control system and an output from said higher harmonic current control system, a DC source voltage is converted to 3phase AC voltages corresponding to the 3phase AC voltage command values and the 3phase AC voltages is outputted to the 3phase AC motor, comprising:

detecting whether or not the 3phase AC voltages converted from the DC source voltage and output to the 3phase AC motor are in a saturated state; and
reducing a current control gain for said higher harmonic current control system if an output voltage saturated state is detected.

1 Specification