| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inverter control device for motor drive which is reduced in torque pulsation and a variation in the number of revolutions by improving the distortion of a waveform in the vicinity of a zero-cross point of a motor phase current during drive, in a state that an influence of displacement between the distortion of the waveform and a compensation value is reduced to the minimum. <P>SOLUTION: In a rectifying circuit which uses an AC power supply as an input, and the inverter control device for motor drive which converts DC power to AC power, a control operation part which controls the operation of an inverter includes a fundamental output voltage operation part which calculates a voltage which is necessary for maintaining the rotation of a motor and should be output from the inverter, and a waveform improving voltage operation part which calculates a voltage for improving the distortion of a phase current waveform of the motor at a cycle shorter than an operation cycle at the fundamental output voltage operation part. The distortion of the waveform in the vicinity of the zero-cross point of the motor phase current can be improved by updating a PWM signal at the operation cycle at the waveform improving voltage operation part on the basis of a fundamental output voltage and a waveform improving voltage. <P>COPYRIGHT: (C)2008,JPO&INPIT |
