Patent ID: 10630226

Abstract:
A motor drive controller comprises: a driver unit comprising semiconductor switches (SW1-SW4) for adjusting power supplied to a motor; a control unit for outputting, to the driver unit, a control signal (PWM1, PWM2) for controlling on and off of the semiconductor switches (SW1-SW4); and an overcurrent monitoring unit for monitoring for an overcurrent at multiple locations in the driver unit. The control unit outputs, to the driver unit at a predetermined timing, the control signal for forcibly maintaining the semiconductor switches at at least two different on-off combination settings (M2) one after another for a predetermine time per each on-off combination setting. Each time the predetermined time has elapsed, the control unit detects whether and which of abnormalities due to short-to-ground and short-to-supply has occurred in a motor power supply line connecting the motor to the driver unit, based on where an overcurrent is detected in the driver unit.