What is Induction Motor? - Electrical C & V


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23 February 2020

What is Induction Motor?

Induction Motor

In a Induction motor, the electrical supply that we provide in the terminal box of the motor is our electrical energy, because of that electrical energy creates a magnet inside the motor. The process of making this magnet is called Mutual Induction. And the rotor starts rotating, and the energy we get when the rotor rotates is mechanical energy.


 What is a generator - if we reverse it means a device in which we give mechanical energy to the input, and it gives us electrical energy in the output. So that device is called a generator.
This is the only difference between a generator and a motor.

The motor has two main parts:-

1. Stator
2. Rotor

1. Stator -
The part inside the motor that does not rotate even when the motor is running, we call it Stationary Parts that is Stator.


2. Rotor- The part inside the motor that rotates when the motor is running is called the rotation part, that is called the Rotor.


Working Principle of Induction Motor 

When we provide an electrical supply in the motor, the supply goes to the winding on the stator of the motor and due to the mutual induction, some magnet is produced near the winding of the motor.
When the rotor comes in front of that magnet, a push on the rotor means a torque which causes our rotor to rotate.

On one hand, where we connect the drive, we mean whatever load we have. That part is called the Drive end of the motor.
The other side of the rotor is fitted with a cooling fan, we call it the Non Drive End of the motor.

Why cooling fans are important?

The function of a cooling fan is to send air into the corrugated strip on the body of the motor, which we call a frame slot. Which makes the motor cooling. This is very important for the motor.
Because the copper winding that occurs on the starter of the motor when the motor continues to run for a long time. The current is also followed in them, due to which there are many losses and the motor is hot.

In such a situation, a cooling fan is placed at the non-drive end to provide cooling of the motor, whose job is to protect the motor from heating by giving air to the frame of the motor.

There are two types of Induction motor.

1. Squirrel Cage Induction Motor
2. Slip Ring Induction Motor

1. Squirrel Cage Induction Motor -

This is the most commonly used AC motor. Its advantage is that its working is very simple. And very important thing, it does not require frequent maintenance.
But we also get a shortage in this motor. We can use Squirrel Cage Induction Motor only in places where we do not need much torque in the beginning.


2. Slip ring Induction Motor -

 The slip ring induction motor has an extra part we call sleeping. The advantage of this is that with this motor you can also add a load of heavy torque to the starting.


Difference between Squirrel Cage and Slip Ring Motor

1. The only difference is that you cannot add extra resistance on a squirrel cage induction motor. But on slip ring induction motor, if you need more torque in starting time, then you can add extra resistance with the help of slip ring at that time.

2. The biggest difference is that in the slip ring motor we can add the registers on the side of the rotor, the more resistance you add, the more torque you will get in starting.

3. This advantage does not happen in squirrel cage motor because the end rings of its rotor.

Three Phase Induction Motor:- Click Here
DC Motor:- Click Here
Synchronous Motor:- Click Here
Servo Motor:- Click Here

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