Abstract
An electronic control system for sensorless BLDCM is proposed. Normally, the back-emf signal has coupling noise from the PWM signal which is used to vary the speed of the motor. So it is difficult to detect the zero-crossing point accurately when the motor work at low speed. In order to improve the controllability of BLDCM at low speed, a new algorithm is presented. The control system is implemented from both hardware and software parts. And the experiments verified the good control performance and dynamic characteristics of the system.
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