Motor control apparatus
AssigneeDenso Corporation
InventorsKenichi Wakabayashi, Soichi Yoshinaga
Life of this patent
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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.
Claims8
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 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 the same;
- and
- a high-order polyphase coordinate converter for converting a signal, for asymptotically reducing said difference to zero, into an original polyphase AC current coordinate system, and 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.
Dependencies are inferred from the claim text.