SQUIRREL 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 the rotor which makes Squirrel Cage Induction Motor different from Wound Type Induction Motor. The stator is the same in both types of motors.
The rotor is the rotating part of a motor. It contains a cylindrical core.
The rotor core is made in the 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 the 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.
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, As you 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 running. This force will produce a torque and rotor will rotate.
> Rotor of Squirrel Cage Induction Motor
The rotor is the rotating part of a motor. It contains a cylindrical core.
The rotor core is made in the 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 the 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, As you 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 running. This force will produce a torque and rotor will rotate.
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