MOTOR DRIVE UNIT

摘要

A motor drive unit includes a motor drive circuit that drives a motor by controlling on/off of current, a control unit generating a drive command signal for driving the motor, a current feedback circuit with the motor and outputs a comparison output signal based on comparison between a current detection signal of a motor current and a target value signal, a latch circuit that latches a current detection result based on the drive command signal and the comparison output signal, and a gate circuit for driving the motor drive circuit based on the drive command signal and a latch output signal output from the latch circuit. The control unit detects a failure of a current feedback system including the current feedback circuit and the latch circuit according to a state of the latch output signal inputted after a time measured based on the drive command signal reaches a predetermined time.

主权项

1. A motor drive unit, comprising:
a motor drive circuit that drives a motor by controlling on/off of current; a control unit generating a drive command signal for driving the motor; a current feedback circuit that comprises a current detection resistor and a comparator connected in series with the motor and outputs a comparison output signal based on comparison between a current detection signal of a motor current and a target value signal; a latch circuit that latches a current detection result based on the drive command signal and the comparison output signal; and a gate circuit for driving the motor drive circuit based on the drive command signal and a latch output signal output from the latch circuit, wherein the control unit detects a failure of a current feedback system comprising the current feedback circuit and the latch circuit according to a state of the latch output signal inputted after a time measured based on the drive command signal reaches a predetermined time.