| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control unit of an AC motor capable of obtaining a current conversion gain correction coefficient in a current detector simply when inverter-driving the AC motor. <P>SOLUTION: The control unit comprises: the current detectors 10a-10c for detecting each phase current output from an inverter device 4; error correction computing units 21a, 21b correcting a current detection value by multiplying a value detected by the current detector by a correction coefficient; a coefficient calculation device 22 for measuring and calculating the correction factor based on a correction command from the outside; a PWM signal generator 19 generating a signal for performing PWM control to the inverter device based on a voltage command; and a signal switch 23 changing the voltage command to the value for measuring the correction coefficient output from the coefficient calculation device. The coefficient calculation device also performs calculation by using the current detection values of other than the phase and reference phase when obtaining the correction coefficient of a specific phase. <P>COPYRIGHT: (C)2008,JPO&INPIT |
