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Saturday, August 3, 2019

quirrel Cage Induction Motor

What is Squirrel Cage Induction Motor,Why its call Squirrel Cage?

It is the kind of Induction Motor All induction motors have a rotor and a stator. Basically, it is the construction of rotor which makes Squirrel Cage Induction Motor different from Wound Type Induction Motor. Stator is same in both types of motors

> Rotor of Squirrel Cage Induction Motor
Rotor is the rotating part of a motor. It contains a cylindrical core.

The rotor core is made in lamination to reduce eddy currents.
Squirrel cage type rotor consists of bars of copper that we call conductors.
The copper bars or conductors are longer than the rotor and are fixed in grooves of rotor core.
These extended conductors are short circuited with each other by means of copper rings on each sides.
Also rotor is sometimes provides with fans on each side for cooling purposes.
This type of construction of bars and end rings is similar to a squirrel cage on which it is named.
That was all about rotor construction. Other than rotor and stator, a motor has also other parts to support and protect the assembly.

In this section, I will share the working of a squirrel cage induction motor with you guys.
Working of a Squirrel Cage Induction Motor?
When the winding of stator are given a 3 phase AC supply, a current will start flowing through it.
This 3 phase AC will give rise to a rotating magnetic field in the rotor.
The speed of rotation of this magnetic field can be found from the frequency of AC supply and number of poles.
This speed is the synchronous speed of motor.
The rotating magnetic field of stator will induce voltage in rotor because its flux lines cut through the rotor. This induced voltage will induce current in rotor winding and another magnetic field will be generated which is rotor’s magnetic field.
Squirrel Cage Induction Motor, squirrel cage motor, Squirrel CageAs you all know, that a current carrying conductor experiences a force on it in presence of a magnetic field. The rotor will also experience a force which would start turning it. This force will produce a torque and rotor will rotate.

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