Method and device for driving induction motor

摘要

When a multiphase induction motor is operated by means of a variable-voltage, variable-frequency inverter which feeds an AC voltage to a primary winding of the multiphase induction motor, the inverter performs processing pertaining to a first process for increasing an output frequency to an output frequency corresponding to a steady-state operation and producing an output for increasing the AC voltage to an overvoltage state in accordance with the output frequency, thereby accelerating the induction motor; and processing pertaining to a second process for decreasing the AC voltage to a voltage corresponding to the steady-state operation when the rotational speed of the induction motor has achieved a predetermined speed.