Performance Evaluation of Brushless DC Motor during Sinusoidal and Trapezoidal Back-EMF Waveform

Abstract

Due to increasing popularity and wide application in the drive system BLDC motor is widely used. An undesirable signal in the brushless dc motor is a ripple in torque, which is in challenging motor control and some machine tools. This article represents the performance evolution of BLDC motor by using the sinusoidal and trapezoidal back EMF waveform for getting the efficient operation of BLDC motor drives. In sinusoidal back EMF waveform requires sinusoidal flux density; it also requires the high-resolution rotor position sensors. In trapezoidal back EMF waveform, it requires lower resolution sensor. Non-ideal properties of any source causes either phase current or back EMF waveform to depart from their entirely sinusoidal waves, which will typically give rise to an undesired pulsating torque components. In current waveform actually, inverter contribute to the torque ripple owing to the time harmonics. BLDC motor is an actually electronic commutated motor. Torque control is accomplished by challenging the back EMF waveform. BLDC motor is powered by the semiconductor devices such that MOSFET. The corresponding results have been comparing using MATLAB/ SIMULINK.

Keywords: BLDC motor, stator current, rotor angle, rotor position, ripple torque, stator back EMF and hall effect signals