Motor control apparatus
First Claim
1. A motor control apparatus for feedback-controlling a polyphase AC current to be fed to an armature of a polyphase AC rotary electric machine, comprising a harmonic control circuit block, whereinsaid harmonic control circuit block includes:
- a high-order dq coordinate converter for converting said polyphase AC current as a signal in a polyphase AC current coordinate system, into a high-order dq signal which is a signal defined in a high-order dq coordinate system rotating at a frequency corresponding to the harmonic order of a harmonic current component to be controlled from among harmonic current components contained in said polyphase AC current;
a low-pass filter for extracting a DC signal component contained in said high-order dq signal;
a subtractor for obtaining a difference between said DC signal component and a command value for said harmonic current component to be controlled; and
a high-order polyphase coordinate converter for converting a signal into said polyphase AC current coordinate system, the signal for asymptotically reducing said difference to zero, whereinsaid harmonic current component to be controlled is controlled by feeding the harmonic current component output from said harmonic control circuit block to said armature.
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Accused Products
Abstract
An object of the present invention is to provide a motor control apparatus having excellent harmonic current control performance, that can simplify circuit configuration and circuit processing while, at the same time, achieving improved control accuracy. To achieve this object, detected motor currents are converted by coordinate converters 19 and 20 into an nth-order dq-axis signal and an mth-order dq-axis signal, and their DC components are extracted by low-pass filters 22 and 23; then, the differences of the DC components relative to respective command values are converted back into three-phase AC signals to control the motor currents.
49 Citations
14 Claims
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1. A motor control apparatus for feedback-controlling a polyphase AC current to be fed to an armature of a polyphase AC rotary electric machine, comprising a harmonic control circuit block, wherein
said harmonic control circuit block includes: -
a high-order dq coordinate converter for converting said polyphase AC current as a signal in a polyphase AC current coordinate system, into a high-order dq signal which is a signal defined in a high-order dq coordinate system rotating at a frequency corresponding to the harmonic order of a harmonic current component to be controlled from among harmonic current components contained in said polyphase AC current; a low-pass filter for extracting a DC signal component contained in said high-order dq signal; a subtractor for obtaining a difference between said DC signal component and a command value for said harmonic current component to be controlled; and a high-order polyphase coordinate converter for converting a signal into said polyphase AC current coordinate system, the signal for asymptotically reducing said difference to zero, wherein said harmonic current component to be controlled is controlled by feeding the harmonic current component output from said harmonic control circuit block to said armature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification