Speed Control of BLDC Motor Using Trapezoidal Commutation & PWM Technique

This paper deals with brush less dc motor which is often taken by the commutated dc motor. The BLDC is a PMSM motor which as numerous advantages compared to other motors like induction motors or DC motors. The BLDC motors are taken by the automotive industries due to its construction and capability of running at high speed with minimal losses compared to commutated DC motor. The BLDC motor as trapezoidal back emf as well as trapezoidal flux distribution, which makes the drive to operate at ease by using trapezoidal commutation in a closed loop operation using PI controller along with PWM technique. This commutation method is also called as six-step commutation or block commutation. The PMBLDC can be operated as sensor less and by using sensors like Hall sensor which is used to track the position of the rotor, by using the position of rotor the gating pulses are provided to the VSI inverter that switches the voltage transitions accordingly. And the PWM technique used is simple PW, which is used to control the voltage by varying the duty cycle which will results in overall control of motor, which will be Providing effective control of the motor. This paper also provides the comparative study of various techniques which are implemented to control the BLDC motor, which helps in better understanding of the motor through those techniques.