Control of Brushless DC Motors Using Sensorless Back-EMF Integration Method

This paper presents the Back Electromotive Force (Back-EMF) integration method, one of indirect Back-EMF commutation methods, used to control the sensorless Brushless Direct Current (BLDC) motor. As its name indicates this technique is based on integration of the electrical Back-EMF signal to get instantaneous information about the mechanical rotor position, correspondingly the objective of this work is to control BLDC motor without using velocity and/or position sensors, just by integration of the Back-EMF signal of the non-fed phase’s to determine the position of the commutation point in order to drive the inverter. Therefore, the proposed control technique is developed using MATLAB / Simulink with Simscape library. The effectiveness of the proposed technique has been validated by simulation results