Three Phase Induction Motor and Its Application 1. Three phase induction motors are widely used in industry due to their simple and robust construction. They convert electrical energy to mechanical energy using a stationary stator and a rotating rotor. 2. The motor works by generating a magnetic flux in the stator coils when powered by a three phase supply. This induces a current in the rotor coils according to Faraday's law of induction. 3. Common industrial applications of three phase induction motors include pumps, presses, lathes, grinders, conveyors, and compressors due to their ability to operate continuously under a variety of conditions.

1. Three Phase Induction Motor
&
Its Application
P.SRUJANA
227Z1A6696

2. Overview
• Introduction
• Components
• Construction
• Working Principle
• Application
• Advantages
• Disadvantages

3. Introduction
• Electrical Machines are Electromechanical
energy conversion devices.
• Electrical motor coverts electrical energy into
mechanical energy and electrical generators
are vice versa.
• Most of the Industrial load are inductive,
especially 3-ph induction motors are widely
used in industrial applications for continuous
operation.

4. Components
• Frame
• Stator
• Stator Winding
• Rotor
• Rotor Winding
• Cooling Fan
• Bearings

5. Construction
• A three-phase induction motor consists of
two major parts:
1.A Stator: It is the stationary part of the
motor.
2.A Rotor: It is the rotating part of the
motor.

6. Construction
Figure-1: Stator Figure-2: Rotor

7. Working Principle
•When 3 phase supply is
given to the motor, the
resulting current generates
a magnetic flux “Ø”.
•According to Faraday’s law,
Emf is induced in the
Copper bar and due to this,
current flows in the rotor.
•The direction of the rotor
can be given by Lenz law.

8. Application
• Pumps and submersible
• Pressing machine
• Lathe machine
• Grinding machine
• Conveyor
• Flour mills
• Compressor

9. Advantages
• The construction of a motor is very simple and
robust.
• The working of an induction motor is very simple.
• It can operate in any environmental condition.
• The efficiency of the motor is very high.
• The maintenance of an induction motor is less
compared to other motors.

10. Disadvantages
• During light load condition, the power factor is very less.And
it draws more current. So, the copper loss is more which
reduce the efficiency during light load condition.
• The starting torque of this motor (squirrel cage induction
motor) is not less.
• The induction motor is a constant speed motor. For the
application where variable speed requires, this motor is not
used.
• Speed control of this motor is difficult.
• The induction motor has a high starting inrush current. This
causes a reduction in voltage at the time of starting.