Sensorless Control of a BLDC Motor using Back-EMF Detection Method

Different ways of sensorless control of Brushless DC Motor (BLDC) and its merits over sensored control are discussed. Due to complexity of motor control system and high cost, sensorless control of a BLDC motor using zero crossing detection of Back-EMF is proposed in this paper. A mathematical model and MATLAB Simulink Model based on Back-EMF zero crossing detection method is also implemented. The function of the different blocks in the model have also been discussed in detail.