In this article we are discuss about working principle of induction motor and their application. we will also discuss about basic function or working of induction motor will also studied about use of induction motor and their application in industries and different load.
Working principle of induction motor
As a general rule, conversion of electrical power into
mechanical power takes place in the rotating part of an electric motor. In D.Cmotors, the electric power is conducted directly to the armature by brush and
commutator .thus in this sense, A D.C motor can be called an conduction motor
.However, in A.C motors, the rotor does not receive electric power by
conduction but by induction in exactly the same way as the secondary of a
2-winding transformer receives its power from the primary that is why such
motor are known as induction motors. In fact, an induction motor can treated as
rotating transformer. In which primary winding is stationary but secondary is
free to rotate
.JPG "Principle of induction motor ,slip ring ,squirrel cage rotor, motor")
Basic working Principle of induction motor
The Rotor of three phase induction motors rotates without
any external supply. When we are given supply to three phase stator winding. A
Rotating magnetic field develops in the stator winding and this magnetic field
link from Rotor. EMF produce in the Rotor and rotating magnetic field develop
in the Rotor. The Rotor Rotate from interaction of stator magnetic field and
Rotor magnetic field. It works on transformers principle or mutual induction In
which we give supply to primary and take supply from primary or take mechanical power of rotor . According
to Faraday law of electromagnetic induction. this is basic working principle of transformer.
“The Rate of change of flux is directly proportional to
induced EMF in the conductor or coil”.
In this Motor EMF direction find by using Fleming right hand rules
Three phase induction is very useful motor In industries
used of 90% induction motor . The Efficiency of induction motor is very
high(90%)and power factor are also high( .89 )three phase induction is very
useful motor In industries used of 90%
induction motor
Advantage of induction motor
1.
Low cost
2.
Absence of commutator
3.
Simple and strong construction
4.
Good operating characteristics
5.
Good power factor
6.
Higher Capacity
7.
Good speed regulation
8.
Proper Size
Construction of Induction motor
In three phase induction motor mainly two parts
1.
Stator
2.
Rotor
1. Stator
Three phase induction motor stator made from silicon steel .Three
phase winding fill up in the stator which we given input A.C supply by external electric source
.According to speed of motor decided the no of poles of stator winding.
P= 120F/Ns
From above equation if no. of poles is more than speed of
motor is less that means no. of poles is inversely proportionally to speed of
motor.
2. Rotor
In induction motor two types of Rotor used.
1.
Squirrel cage Rotor
2.
Slip ring Rotor
1. Squirrel cage Rotor
In induction Motor, 90% Squirrel
cage rotor are used. In Squirrel cage rotor copper bars fill up in the slots of
rotor and all copper bars short circuited each other by using of End ring . In
this type Rotor does not connect external resistance.
Advantage
A..
Less maintenance
B.
Does not use of carbon brush
2.Slip ring Rotor
In slip ring rotor three phase winding fill up in the rotor
these winding connect star (Y)connection .these three phase winding also
connect with three slip ring for input supply .Input supply of motor is given
by carbon brush
Advantage of slip ring Rotor
1.
Improve starting torque by external resistance
2.
less costly
By this article we can learn about working principle of induction motor and their uses and construction. From above article we will learn about application and construction of induction motor. so it is the working principle of induction motor.
For better understand the working principle of induction motor please watch this video.
By this article we can learn about working principle of induction motor and their uses and construction. From above article we will learn about application and construction of induction motor. so it is the working principle of induction motor.
For better understand the working principle of induction motor please watch this video.