Patent ID: 9575127
Date: 2017-02-21
CPC Classifications: B62D,G01R,H02P

Claim:
1. A motor control device for controlling a current and an applied voltage to a motor having a plurality of phases, comprising: an inverter for supplying electric power from a power supply to the motor; current control means for generating a voltage command in accordance with a current command to control the current to the motor; an inverter driving circuit for driving the inverter in accordance with the voltage command to control the applied voltage to the motor; and fault detecting means for detecting a fault occurrence state based on the voltage command, a power-supply voltage of the power supply, a motor rotation speed of the motor, and currents in the plurality of phases, wherein when the power-supply voltage is equal to or higher than a predetermined voltage, when the motor rotation speed is equal to or lower than a predetermined speed, when a voltage command in a target phase is not in a vicinity of zero, when a phase current of the target phase is equal to or lower than a predetermined current, and when a state in which a control error with respect to the current command or the voltage current is equal to or larger than a predetermined error is detected over a predetermined time period or longer, the fault detecting means determines occurrence of an open-state fault in the target phase.