Four Quadrant Operation of BLDC Motor with Load Variations

This paper provides a technical review of position and speed sensor less methods for controlling brushless direct current (BLDC) motor drives, including the background analysis using sensors, limitations and advances. The performance and reliability of BLDC motor drivers have been improved because the conventional control and sensing techniques have been improved through sensor less technology. This four quadrant operation of BLDC motor with load variations is simulated using MATLAB/SIMULINK software. The advances in Sensor less methods are reviewed and recent developments in this area are introduced with their inherent advantages and drawbacks, including the analysis of practical implementation issues and applications. The study includes a deep overview of state-of-the-art back-EMF sensing methods, which includes Terminal Voltage Sensing, Third Harmonic Voltage Integration, Terminal Current Sensing, Back-EMF Integration and PWM strategies.