What is an Induction Motor?
An induction engine or asynchronous motor can be an AC electric engine in which the electric energy in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field 
of the stator winding.
Working Theory of Induction Motor
We have to give dual excitation to make a DC electric motor to rotate. In the DC engine, we provide one supply to the stator and another to the rotor through brush arrangement. However in induction electric motor, we give only one supply, so that it is interesting to know how an induction engine works. It is simple, from the name itself we can understand that here, the induction process is involved. Whenever we give the supply to the stator winding, a magnetic flux gets stated in the stator due to the stream of current in the coil. The rotor winding is so arranged that every coil becomes short-circuited.
The flux from the stator cuts the short-circuited coil in the rotor. As the rotor coils are short-circuited, according to Faraday’s law of electromagnetic induction, the existing will start flowing through the coil of the rotor. When the existing through the rotor coils flows, another flux gets produced in the rotor. Now there are two fluxes, one is usually stator flux, and another can be rotor flux. The rotor flux will become lagging in respect of the stator flux. Due to that, the rotor will feel a torque which can make the rotor to rotate in the direction of the rotating magnetic field. This is the working principle of both one and three phase induction motors.
Types of Induction Motors
The types of induction motors could be classified depending on whether they are a solitary phase or three phase induction motor.
Single Phase Induction Motor
The types of solitary phase induction motors include:
Split Phase Induction Motor
Capacitor Start Induction Motor
Capacitor Start and Capacitor Run Induction Motor
Shaded Pole Induction Motor
Three Phase Induction Motor
The types of three phase induction motors include:
Squirrel Cage Induction Motor
Slip Ring Induction Motor
We have mentioned previously above that the single-phase induction motor is not a self-starting engine, and that the three-phase induction engine is self-starting. Just what exactly is a self-starting engine?
When the electric motor starts running automatically without any external force put on the machine, then the motor is referred to as ‘self-starting’. For example, we see that whenever we placed on the switch the fan starts to rotate automatically, so it can be a self-starting machine. Point to be noted that lover used in home devices is a single phase induction motor which is certainly ac motor inherently not self-starting. How? Will a question arise concerning how it operates? We will discuss it today.