| 摘要 |
PURPOSE:To effectively control the V/F ratio in response to the load of a motor and to stably control an inverter by altering the input voltage of an induction motor with the added output of the peak value of the output current of a converter and the voltage in response to the set speed. CONSTITUTION:A current detector 8 is provided between a converter 1 and an inverter 3, and the peak value of the output of the detector 8 is sampled and held by a sample-holding circuit 11. After the outputs of the circuit 11 and a speed setter 5 are added by an adder 9, it is supplied through an amplifier 10 to a phase control circuit 2, thereby controlling the converter 1. |
