Question

In a single phase induction motor running at a slip of 5% with reference to forward field, the slip with reference to backward field is?

Answer 1

Answer:

In single phase induction motor,we get alternating magnetic field instead of rotating as in three phase, this alternating mf can be considered as the one which has two components, each having magnitude half of the resultant and rotating in opposite directions with same speed.( Imagine 2 cars starting at same point and driving in opposite directions in a circular path with same speed, consider cars as stator of induction motor, and 2 persons running behind the respective cars as rotors, however person cant catch the car), we know that if single phase induction motor is driven mechanically by some means it continues to develop torque in the same direction we have rotated it, slip corresponding to our rotation, let it be positive speed, then we get forward slip, slip with one car in our consideration, i.e, forward slip=(Ns-N/Ns), where Ns is stator speed, N is rotor speed,..Backward slip will be the one corresponding to opposite that is negative speed( other car in opposite direction), backward slip= (-Ns-N/-Ns), hope it helps.

Slip is nothing but the difference between stator and rotor speeds, %s= Ns-N/Ns

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