MOTOR ABNORMALITY DETECTING DEVICE AND METHOD

摘要

PROBLEM TO BE SOLVED: To provide a motor abnormality detecting device and method capable of detecting the motor abnormality accurately.

SOLUTION: A detecting part 30 of ΔTc/Tj detects the difference between a temperature of FET 18 turning on/off of power supply to a DC motor 11 and an ambient temperature. Diagnosis controlling part 31 detects abnormality such as motor-lock and short of the DC motor 11 based on the difference ΔTc. A diagnosis controlling part 31 reduces a frequency and a duty number of PWM signals with controlling a PWM computing controlling part 23 and PWMOSC 22 when motor-lock is detected. A FET 18 is turned off with controlling a gate drive 26 when short is detected.

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