Topic : 3 Phase Induction Motors. Write notes on this topic containing construction, working principle, types, application as subheading

Sure, here are the notes on the topic "3 Phase Induction Motors":

1. Construction: The three-phase induction motor is made up of two main parts: the stator and the rotor. The stator is the stationary part of the motor, which includes the motor casing, as well as two or more magnetic pole pieces. The rotor is the rotating part, and it comes in two types: the wound type and the squirrel-cage type.

2. Working Principle: The working principle of the three-phase induction motor is based on the principle of electromagnetic induction. When the three-phase supply is given to the stator winding, it creates a rotating magnetic field. This rotating magnetic field induces a current in the rotor due to electromagnetic induction. The current-carrying rotor is placed in this rotating magnetic field, which causes the rotor to rotate.

3. Types: There are two types of three-phase induction motors, based on the type of rotor used: Squirrel Cage Induction Motor and Wound Rotor Induction Motor (or Slip Ring Induction Motor). The Squirrel Cage Induction Motor is the most commonly used type of motor in most of the industries. It is simple in construction, reliable, and very economical. The Wound Rotor Induction Motor is used in industries for high starting torque and variable speed applications.

4. Applications: Three-phase induction motors are widely used in many applications like a centrifugal pump, conveyor, air compressor, electric fan, blowers, crushers, millers, and many other industrial applications. They are also used in industries for driving compressors, pumps, fans, blowers, mills, conveyors, and crushers. They are preferred due to their rugged construction and absence of brushes.