Sensor less Speed Control Method for Brushless DC Motors Using Back EMF Method

The attributes of a typical BLDC motor consist of high power to weight ratio, high speed, electronic control, high efficiency, low maintenance and silent operation therefore has gained good competence in the current market. The potential of this motor is exercised for most of the industrial applications and automobiles. These motors do not have any brushes for commutation and thus necessities usage of position detecting sensors which would have increased the total cost. To compromise this problem sensorless zero crossing back emf method with PI controller is proposed in this paper. Simulation has been done to verify the proposed scheme.