What is an Induction Motor?
An induction motor or asynchronous motor can be an AC electric electric motor in which the electric current in the rotor had a need to generate torque is obtained by electromagnetic induction from the magnetic field of the stator winding.
Working Principle of Induction Motor
We need to give dual excitation to produce a DC engine to rotate. In the DC engine, we give one supply to the stator and another to the rotor ac motor through brush arrangement. However in induction motor, we give only 1 supply, so it is interesting to learn how an induction electric motor works. It is simple, from the name itself we are able to understand that right here, the induction procedure is involved. When we give the supply to the stator winding, a magnetic flux gets produced in the stator due to the circulation 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, in accordance to Faraday’s regulation of electromagnetic induction, the existing will start flowing through the coil of the rotor. When the current through the rotor coils flows, another flux gets produced in the rotor. Now there are two fluxes, one can be stator flux, and another is usually rotor flux. The rotor flux will become lagging in respect of the stator flux. Because of that, the rotor will feel a torque which can make the rotor to rotate in direction of the rotating magnetic field. This is actually the working principle of both single and three phase induction motors.
Types of Induction Motors
The types of induction motors can be classified depending on whether they are a one phase or three phase induction electric motor.
Single Phase Induction Motor
The types of one phase induction motors include:
Split Phase Induction Motor
Capacitor Start Induction Motor
Capacitor Begin 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 motor, and that the three-phase induction engine is self-starting. So what is a self-starting engine?
When the engine starts running automatically without any external force applied to the machine, then the motor is referred to as ‘self-starting’. For example, we see that when we placed on the switch the fan starts to rotate immediately, so it can be a self-starting machine. Point to be noted that lover used in home devices is a single phase induction electric motor which is inherently not really self-starting. How? Really does a question arise as to how it works? We will discuss it now.