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Modeling, Analysis and Simulation of Sensorless Control of Brushless Dc Motor Based On BEMF Difference Estimation Method

Merin John, Vinu Thomas

The Permanent Magnet Brushless DC (BLDC) motor offers higher efficiency, low maintenance, reduced weight and compact construction. For many industrial applications, the BLDC motor is increasingly being used. This paper presents a new sensorless drive scheme for BLDC motor based on the back EMF difference. The commutation point of the drive is determined by detecting the Zero Crossing Point (ZCP) of difference in back EMF of two phases. Simulations of the proposed method have been carried out using MATLAB/Simulink.