A microcontroller-based sensorless brushless DC (BLDC) motor drive for aeromodelling

摘要

A novel approach to back-EMF detection of sensorless brushless DC motor drive systems was proposed. Theoretical analysis of back-EMF sensing is presented, and indicates the back-EMF signal can be extracted for each floating phase whether the PWM is on or off time. As a result, the proposed method rejects the high frequency switching noise and no filtering. Moreover, it provides a highly accurate zero crossing point. This proposed sensing scheme is implemented into a microcontroller for a sensorless BLDC motor. The microcontroller has been successfully applied to the aeromodelling motor. The applied results verify the theoretical analysis and demonstrate that the microcontroller provide a good motor performance.