Brushless dc (BLDC) motors are ideally suitable for EVs because of their high power densities, good speed-torque characteristics, high efficiency, wide speed ranges, and low maintenance. BLDC motor is a type of synchronous motor.
It means that the magnetic field generated by the stator and the magnetic field generated by the rotor rotation are at the
same frequency. BLDC motors do not experience the “slip” which is normally seen in induction motors. However, a BLDC
motor requires relatively complex electronics for control. As illustrated in Fig. 1, in a BLDC motor, permanent magnets are
mounted on the rotor, with the armature windings being fixed on the stator with a laminated steel core. Rotation is initiated and maintained by sequentially energy opposite pairs of pole windings that are said as form phases. Knowledge of rotor position is critical to sustaining the motion of the windings