3 Phase Concept

WHY WE USE 3 PHASE ?

In the electrical field we use only 3 phases exactly. Not more or less,Why? Because we minimum of 3 phases to produce a rotating magnetic field(RMF). We studied that more than one phase is enough to produce a torque, but imagine 2 equal magnitude phases come into action the phase angle will be 180⁰  and will oppose each other.

So we use 3 phases to produce a rotating magnetic field and can carry more power than a single phase. Remember one thing, the only 3 phase AC loads are motors. No other loads are directly consume or use the 3 phase AC supply. You can easily understand the concept with an IC engine with 3 cylinder.