Performance Assessment and Transient Analysis of Brushless DC Motor

This paper investigates steady state and transient performance analysis of BLDC motor by using PI and PID controller. The torque in BLDC motor is produced with effect of magnetic field and current. Magnetic field is generated by the strong permanent magnet, and motor current depends upon voltage control and back emf (E
b
). In order to obtain required torque and speed at a particular load, current required must be controlled. The trapezoidal type BLDC machine controlled using 3-phase Inverter Bridge. The commutation sequence is done with hall sensor and gate pulses. First the transfer function of BLDC motor is achieved using the Laplace transformation of BLDC motor equivalent circuit equations. Then, the transient or dynamic analysis is performed under MATLAB environment using PI and PID controller. The analysis shows that PI controller presents better results as compared to PID controller.