Patent ID: 9065368
Filing Date: 2015-06-23
Classification: H02P

Abstract:
1. An induction motor control apparatus for controlling an operation of an induction motor by controlling an operation of an inverter apparatus that converts direct-current power into alternating-current power and supplies the alternating-current power to the induction motor, wherein the operation of the inverter apparatus is deactivated after an operation in which the inverter apparatus is caused to output a zero voltage to the induction motor is continued for a predetermined time, such that a magnetic flux in the induction motor is caused to decay before the operation of the inverter apparatus is deactivated, in a period before the inverter apparatus is caused to output the zero voltage and before the start of a decrease in a torque current and an excitation current for the induction motor, a voltage command for the inverter apparatus is calculated by using a calculation equation including a time constant calculated from a secondary resistance of the induction motor and a secondary self-inductance of the induction motor as a parameter; and in a period after the start of the decrease in the torque current and the excitation current and until the torque current and the excitation current become zero, the time constant included in the calculation equation is changed to a time constant calculated from a resistance value converted to the primary side of the induction motor and a leakage inductance value converted to the primary side of the induction motor.