The constructional structure of BLDC is shown in Figure 1.
The stator comprises eighteen coils and the rotor consists of
eighteen permanent magnet poles. The permanent magnets
embedded in the rotor are arranged back to back so that the
flux flows toward the coil slot in the stator [4]. The coils were
winding in each slot of stator in series connection. These coils
are grouped according to its phase. Each phase is displaced by
120° electrical degrees to each other