FAULT STATE FEEDBACK METHOD FOR BLDC MOTOR AND APPLICATION OF BLDC MOTOR AND AIR-CONDITIONING SYSTEM

摘要

Disclosed are a fault state feedback method for a BLDC motor, an application of the BLDC motor, and an air-conditioning system. The BLDC motor is provided with a feedback port FG that outputs a motor rotating speed signal outwards, the FG outputting a PWM signal. The method is characterized in that: when the port FG outputs the motor rotating speed signal outwards, the frequency of the signal is defined in a first frequency band, and within the range of the first frequency band, the frequency of the PWM signal is used to represent the rotating speed; and when a motor fault signal is output outwards, a second frequency signal different from the first frequency band is employed. The fault state feedback method is simple, convenient to carry out, capable of feeding back different fault signals of the motor, and high in reliability.