| 摘要 |
PURPOSE:To obtain a controller capable of stably operating even in a low speed range by detecting the power factor of the output of an inverter and correcting the set voltage value by a detection signal. CONSTITUTION:The power factor of the output of an inverter 5 is detected by a power factor sensor 15, the output of a voltage pattern generator 9 and hence the set voltage value is corrected by a correcting circuit 16, and the peak value of the sinusoidal wave is controlled so that the output voltage of the inverter 5 becomes substantially set value. Since the output voltage of the inverter tends to increase as the power factor is deteriorated, the output of the generator 9 and hence the voltage set value decreases by the correcting circuit 16, thereby controlling the output voltage of the inverter substantially constantly irrespective of the power factor. |
