<Dl> <Dd> ω s = 2 π f P (\ displaystyle \ omega _ (s) = 2 \ pi (\ frac (f) (P))) </Dd> </Dl> <Dd> ω s = 2 π f P (\ displaystyle \ omega _ (s) = 2 \ pi (\ frac (f) (P))) </Dd> <Ul> <Li> f (\ displaystyle f) is the frequency of the AC supply current in Hz, </Li> <Li> p (\ displaystyle p) is the number of poles per phase . </Li> <Li> P (\ displaystyle P) is the pair number of poles per phase . P (\ displaystyle P) = p (\ displaystyle p) / 2 </Li> </Ul> <Li> f (\ displaystyle f) is the frequency of the AC supply current in Hz, </Li>

Ratio of starting torque to running torque in synchronous motor