| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control device of a motor that can prevent the generation of a motor phase current of a frequency lower than a fundamental wave frequency even if an error is generated in an output voltage of a power converter. <P>SOLUTION: The control device of the motor that controls the vector or the v/f of an AC motor by using a semiconductor power conversion device comprises a beatless control means that detects a low-frequency component different from the fundamental wave frequency from a current of the motor, and controls the power converter so as to change the low-frequency component. The beatless control means 21 comprises: coordinate conversion means 211, 214 and primary delay filter 212, 213 that detect fundamental wave current components from phase currents of the motor 17; adding means 216u to 216w that detect the low-frequency components by subtracting the fundamental wave current components from the phase currents; and multiplication means 217u to 217w and adding means 218u to 218w that generate final voltage command values by negatively returning the low-frequency components to voltage command values of an inverter 13. <P>COPYRIGHT: (C)2007,JPO&INPIT |
