| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve desired correction for maintaining a state in which a motor current can be detected by simple processing, when adopting a one-shunt current detection method. <P>SOLUTION: In a motor control device for vector-controlling a three-phase motor with the one-shunt current detection method, an ab coordinate that stepwise rotates for every electrical angle of 60° according to a phase of a voltage command vector viewed from a U-phase axis is defined. A voltage command vector on a dq coordinate is transformed on the ab coordinate, and it is determined whether currents for two phases can be detected without correcting the voltage command vector, based on the amplitude of the coordinate axis components (v<SB>a</SB>, v<SB>b</SB>) of the voltage command vector on the ab coordinate. When the correction is required, the amplitude of each of the coordinate axis components is corrected. A three-phase voltage command value to be supplied to an invertor is created from the corrected voltage command vector. <P>COPYRIGHT: (C)2008,JPO&INPIT |
