When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor
A)remains same as the original value
B)decreases to half the original value
C)tends to becomes zero
D)increases to two times the original value

Question

Quizplus · Accepted Answer

The speed of the rotor in a synchronous motor is determined by the synchronous speed, which is directly proportional to the supply frequency and inversely proportional to the number of poles. Halving the number of poles doubles the synchronous speed, hence the rotor speed increases to two times the original value.

When the Stator Windings Are Connected in Such a Fashion