What is working principle of induction motor? | what is conduction motor ? | what is Rotating transformer | Advantages and disadvantages if induction motor.

General Principle As a general rule, conversion of electrical power into mechanical power takes place in the rotating part of an electric motor.

Conduction motor :

In d.c. motors, the electric power is conducted directly to the armature (i.e. rotating part) through brushes and commutator. Hence, in this sense, a d.c, motor can be called a conduction motor.

Induction motor :

However, in a.c. motors, the rotor does not receive electric power by conduction but by induction in exactly the same way as the secondary of a 2-winding transformer receives its power from the primary.That is why such motors are known as induction motors.

In fact, an induction motor can be treated as a rotating transformer i.e. one in which primary winding is stationary but the secondary is free to rotate.

Of all the a.c. motors, the poly phase induction motor is the one which is extensively used for various kinds of industrial drives.

It has the following main advantages and also some disadvantages of induction motor :

Advantages:

1. It has very simple and extremely rugged, almost unbreakable construction (especially squirrel

cage type).

2. Its cost is low and it is very reliable.

3. It has sufficiently high efficiency. In normal running condition, no brushes are needed, hence frictional losses are reduced. It has a reasonably good power factor

4. It requires minimum of maintenance.

5. It starts up from rest and needs no extra starting motor and has not to be synchronized. Its starting arrangement is simple especially for squirrel-cage type motor

Disadvantages:

1. Iis speed cannot be varied without sacrificing some of its efficiency

2 Just like a dc. shunt motor, its speed decreases with increase in load

3 IS starting torque is somewhat inferior to that of d.c shunt motor

This is is my view on What is working principle of induction motor? what is conduction motor ? what is Rotating transformer | Advantages and disadvantages if induction motor.
Thank you .

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