A novel flux estimation algorithm based position sensorless field oriented vector controlled permanent magnet brushless DC motor drive

Permanent Magnet Brushless DC (PMBLDC) motor is a permanent magnet synchronous machine with solid state commutation system having huge scope to be used as an industrial motor in future. For proper commutation of the phase currents, rotor position information must be obtained from the position sensors. But there are some vital disadvantages of position sensors. Instead of using position sensors, a novel flux estimation algorithm is proposed in this paper to estimate the rotor position and speed to perform the operation of position sensorless field oriented control (FOC) of a PMBLDC motor. Comparison between the actual and estimated quantities is analyzed through the results for evaluating the performance of proposed flux estimation algorithm, rotor position estimator and speed estimator. Though there is no rotor position or speed sensor in the proposed control drive, the performance of this drive remains unchanged comparing to the position sensored control drive.