3 Phase Induction Motor Is Self Starting Or Not

But we can create a rotating magnetic field by a two phase construction. Hence the 3 phase synchronous motor is not a self starting motor.

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Why Is The Single Phase Motor Not Self Starting

As discussed above single phase induction motors are not self starting because a single phase supply cannot produce a rotating magnetic field.

3 phase induction motor is self starting or not. This is possible when the rotor also rotates at synchronous speed. A 3 phase supply is given to the armature of synchronous motor produces a rotating magnetic field. Like three phase induction motor in three phase synchronous motor also rotating magnetic field is produced but the synchronous motor is not self starting.

For an induction motor to be self starting the stator needs to have a rotating magnetic field. Thus it is necessary to provide a starting circuit and associated start windings to give the initial rotation in a single phase induction motor. In order to develop a continuous torque the two fields must be stationary with respect to each other.

It does not require nay external mean to rotate. A single phase induction motor is not self starting. Now we consider a 3 phase synchronous motor.

Thus we see that induction motor is self starting. We require a two phase or three phase supply for the production of rotating magnetic field. Induction motor works in the principle of electromagnetic induction but synchronous motor works in the principle of attraction or locking.

In a three phase induction motor the rotating magnetic field is created by the fluxes of the three phase windings which are displaced by 120 degrees.

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