| 摘要 |
PURPOSE:To stably control against a transient load change by collecting the transient load change from a variation in a DC current and so controlling as to compensate the change. CONSTITUTION:A difference of DC currents flowing to a predetermined motor 3 of a frequency of a voltage to be applied to the motor 3 immediately before and after can be obtained as a power factor from power factor calculating means 26. A voltage to be decided according to the power factor and an external command value is obtained by a V/F calculating means 27. A compensation value of an output from the means 27 is calculated based on the output of DC current detecting means 25, and the motor 3 is controlled based on the output of the means 27 by considering the calculated compensation amount. Thus, a stable control is executed against a transient load change. |
