Patent ID: 9647597
Date: 2017-05-09
CPC Classifications: H02P

Claim:
1. A motor control apparatus comprising: a voltage regulator configured to execute a voltage increase mode to increase a voltage applied to an induction motor from a lower limit of a first predetermined range over time; a frequency regulator configured to execute a frequency decrease mode to decrease a frequency of the applied voltage from an upper limit of a second predetermined range over time, the frequency regulator being configured to limit decrease of the frequency when a bus voltage of a bus exceeds a first threshold in the frequency decrease mode, the bus supplying DC power to an inverter to drive the induction motor; a mode changer configured to alternatively change the voltage increase mode and the frequency decrease mode so as to control the induction motor to change from a free running state to a state in which the applied voltage and the frequency satisfy a predetermined relationship; and a determinator configured to determine whether the applied voltage and the frequency satisfy the predetermined relationship, wherein the frequency regulator is configured to: