How is the rotor field of an induction motor produced?

How is induction motor rotor made?

In most induction motors, the rotor winding is of the squirrel-cage type where solid conductors in the slots are shorted together at each end of the rotor iron by conducting end rings. … For larger motors, the squirrel cage is made of copper, aluminum, or brass bars welded or brazed to end rings of a similar material.

How is rotating magnetic field produced in alternator?

Typically, a rotating magnet, called the rotor turns within a stationary set of conductors wound in coils on an iron core, called the stator. The field cuts across the conductors, generating an induced EMF (electromotive force), as the mechanical input causes the rotor to turn.

Why induction motor does not run at synchronous speed?

The induction motor can’t run at synchronous speed because it is not possible to run the motor without load. Even the motor is at no load, there would be core loss,copper loss and air friction loss.In a nut shell, the motor slip can not be zero in any case.

What is rotor EMF?

5.3.3 Rotor induced e.m.f. and current

The rate at which the rotor conductors are cut by the flux, and hence their induced e.m.f., is directly proportional to the slip, with no induced e.m.f. at synchronous speed (s = 0) and maximum induced e.m.f. when the rotor is stationary (s = 1).

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What is single phasing of motor?

Single phasing simply means that one of the line connections of a motor is not connected, resulting in the motor running on a single phase. A single-phase condition subjects the motor to an excessive voltage imbalance, often meaning high currents and motor heating.

Which induction motor has maximum speed?

Synchronous and full load speed of amplitude current (AC) induction motors

Speed (rpm)
Number of Poles Frequency (Hz, cycles/sec)
Synchronous Full Load
2 3600 2900
4 1800 1450