| 摘要 |
PURPOSE:To prevent a hunting phenomenon by applying an auxiliary command value for a current command value to a current regulator to obtain a current value of an interrupting limit even if a motor becomes no load state. CONSTITUTION:The actual current value I detected by current detectors 8, 9 is brought into coincidence with the sum of a target current value I* given by a voltage regulator 20 and a target auxiliary current value DELTA1* by a no load current setter 70. The output of the regulator 20, i.e., the value I* is limited by a limiter 201 to 0<=I*<=IMAX*. Accordingly, the value I is controlled to a range of I*<=I<=IMAX*+DELTAI*. Accordingly, if the set value DELTAI* in the setter 70 is set to a slightly larger value than the interrupting limit corresponding value, the current I does not fall within the interrupting range even when the motor operates at no load. |
