Page 331 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

2 Induction Motor
According to rotor construction, there are two types of induction motors. They are squirrel cage induction motors
and phase wound induction motors.

On the basis of supply phases, the induction motor is classified into single-phase and three-phase induction
motors.
i Squirrel Cage Rotor
The rotor of the motor has the shape of a squirrel cage. In this, the inner component is connected to the output
shaft and looks like a cage. This rotor decreases the magnetic locking and the humming sound of the rotor.
ii Phase Wound Rotor
This rotor is a variation of the three-phase induction motor, which is designed to provide high torque for loads with
high inertia while taking very little current. It is also known as slip ring motors.
iii Single-phase induction motor

Construction of Single-Phase Induction Motor

A single phase induction motor is similar to the three phase squirrel cage induction motor except there is single
phase two windings (instead of one three phase winding in 3-phase motors) mounted on the stator and the cage
winding rotor is placed inside the stator which freely rotates with the help of mounted bearings on the motor shaft.

Similar to a three-phase induction motor, single-phase induction motor also has two main parts;
• Stator
• Rotor
Roter
Rotor as the name suggests it is a rotating part of an electrical machine, in which current is induced by transformer
action from rotating magnetic field.
Induction motor rotor is of two types
• Squirrel Cage Rotor

• Wound Type Rotor or Slip Ring Type Rotor

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CITS : E & H - Electronics Mechanic - Lesson 205 - 222