Three Phase Induction Motor

Three Phase Induction Motor

The most common type of AC motor being used throughout the work today is the "Induction Motor Applications of three-phase induction motors of size varying from half a kilowatt to thousands of kilowatts are numerous. 

They are found everywhere from a small workshop to a large manufacturing industry.

The advantages of three-phase AC induction motor are listed below:

✓ Simple design

✓ Rugged construction

✓ Reliable operation

✓ Low initial cost

✓ Easy operation 

✓ Simple maintenance

✓Simple control gear for starting and        speed control

✓ High efficiency.

Induction motor is originated in the year 1891 with crade construction (The induction machine principle was invented by NIKOLA TESLA in 1888.). 

Then an improved construction with distributed stator windings and a cage motor was built. 

The slip ring rotor was developed after a decade or so. 

Since then a lot of improvement has taken place on the design of these two types of induction motors. 

Lot of research work has been carried

out to improve its power factor and to achieve saitable methods of speed control.

Types and Construction of Three Phase Induction Motor

Three phase induction motors are constructed into two major types:

✓ Squirrel cage Induction Motors

✓ Slip ring Induction Motors