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SENSORLESS AND TRANSDUCERLESS CONTROL OF PERMANENT MAGNET BRUSHLESS DC MOTOR USING DIRECT BACK EMF DETECTION

N Muraly
Faculty of Engineering, University Malaysia Sarawak (UNIMAS), Kota Samarahan 94300, Sarawak, Malaysia.

Abstract—This paper deals with a scheme of permanent magnet brushless dc motor drive sensor less speed control. The simulation model of BLDC motor is obtained by approximation of real back EMF wave form to ideal trapezoidal waveform. A sensor less control of BLDC motor requires a three-phase inverter with six-step commutation. These commutation timing is determined by the rotor position, at every 600 by detecting zero crossing of back EMF on the floating coil of the motor. Encouraging simulation results have been obtained.

Index Terms—Permanent magnet brushless DC motor, Speed sensorless control, Rotor position detection, Back EMF

Cite: N Muraly, "SENSORLESS AND TRANSDUCERLESS CONTROL OF PERMANENT MAGNET BRUSHLESS DC MOTOR USING DIRECT BACK EMF DETECTION," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 1, No. 1, pp. 96-105, March 2015.