Performance analysis and comparison of BLDC motor drive using PI and FOC

BLDC motors and their drives are gaining attention day by day from various industrial and household appliance manufactures because of its high efficiency, high power density, high torque, and low inertia, less noise, compact form, almost no maintenance, salient operation, and reliability. The BLDC motor can also be thought of an intermediate between a DC motor and a synchronous motor, which extracts the advantages of each of them and rejects their disadvantages. BLDC motor is inverter fed permanent magnet synchronous motor, having permanent magnet on rotor and trapezoidal or sinusoidal shaped back EMF. The BLDC motor employs a DC supply to stator phase winding of the motor by power devices, the commutation of phase is achieved by electronics commutation system instead of brushes and commutator. Hence the rotor position at six steps needed to achieve electronics commutation perfectly. The BLDC motor emerging as the dominant new technology in motion control. The paper builds simple, accurate and fast running model of BLDC motor drive in MATLAB/Simulink. They are especially beneficial in the situation where actual system does not exist. Changing the values of parameters can often be done more quickly than by conducting a series of experimental studies on actual system. In this dissertation, Modelling, simulation and analysis of PI controller and field oriented controller (FOC) based sensor less scheme for a BLDC motor has been carried out.