Table of contents | |
Induction Machines | |
What is an Induction Motor? | |
Power Flow | |
Types of Induction Motors | |
Working Principle of Induction Motor |
The induction machine was invented by Nikola Tesla in 1888. Right from its inception, its ease of manufacture and its robustness has made it a very strong candidate for electromechanical energy conversion.
Induction Motor
The induction machine can operate both as a motor and as a generator. As a generator, its performance is not satisfactory. However it is used in wind turbines. It is extensively used as a motor. It is also called as an asynchronous machine.
Synchronous Speed
Synchronous speed:
Example 1: A 3-phase induction motor is wound for 8 poles and is supplied from 50 Hz source. Calculate:
(1) Synchronous Speed
(2) Slip of the motor when speed is 720 RPM.
Solution:
(1) Synchronous Speed:
Ns = 120f/P = 120×50/8 = 750 rpm
(2) Slip of the motor, when
Nr = 720 rpm
s = (Ns−Nr)/NS=(750−720)/750 = 0.04 perunit
%s = (750−720)/750×100 = 4%
The types of induction motors can be classified depending on whether they are a single phase or three phase induction motor.
The types of three phase induction motors include:
Slip Ring Induction Motor
We have already mentioned above that the single-phase induction motor is not a self-starting motor, and that the three-phase induction motor is self-starting.
This is the working principle of both single and three-phase induction motors.
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1. What is the working principle of an induction motor? |
2. What are the types of induction motors commonly used? |
3. How does power flow in an induction motor? |
4. What are the key components of an induction motor? |
5. How is an induction motor different from a synchronous motor? |
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