Method for driving induction motor

摘要

A method for driving an induction motor is provided, in which a variable-voltage variable-frequency inverter included in a driving device for the induction motor outputs an AC voltage to the induction motor to rotate the induction motor, the AC voltage corresponding to a frequency determined based on a rotational rate of the induction motor. The method includes a first step for increasing an output frequency from a first frequency value to a second frequency value by the inverter during a steady operation of the induction motor, the inverter increasing an output voltage from a first normal-state voltage value to an overvoltage value as the output frequency approaches the second frequency value; and a second step for decreasing the output voltage from the overvoltage value to a second normal-state voltage value by the inverter while maintaining the output frequency at the second frequency value.