SMART WORK FOR GREAT SUCCESS......

1. THREE - PHASE SYNCHRONOUS GENERATOR
PRESENTED BY
SHIRISHA REDDYMALLA

2. OVER VIEW
Defination
Principle
Construction
Applications

3. it is an electro-chemical energy conversion device which converts mechanical energy
into 3-phase AC electrical energy
The synchronous generators are run’s at a particular constant speed that speed is
called as synchronous speed . Hence the generator is called as synchronous
generator.
NS
= 120f/p
Where f = supply frequency
p=poles of the machine
NS= Synchronous speed
DEFINATION

4. WORKING PRINCIPLE
It works on the principle of FARADAY’S LAW..
Whenever a conductor cuts the magnetic field an EMF will be induced in that
conductor.
In alternator the field winding is placed on rotar which required to produce
magnetic flux /magnetic field
The armature conductors/ windings are placed on stator
When promover given to rotar and field winding is excited, a rotating
magnetic field having constant magnitude will be produces RMF

5. CONSTRUCTION
 It is mainly divided into 2 –types
 a) Stator
 b)Rotar

6. CONSTRUCTION OF STATOR…..
Stator: It is hallow cylindrical in shape and it is made up of cold rolled non-
oriented silicon steel. Which is laminated to reduce eddy currents ,it’s inner
surface is slotted.

7. CONSTRUCTION OF ROTAR…..
Based on rotar construction the synchronous generators are classified as 2-
types they are
 a) Salient pole type
b)Non-Salient pole type

8. SALIENT POLE TYPE….
The rotar has longer diameter and shorter axial length
Hence the air gap is minimum a long the inter polar q-axis so that the flux
distribution is maximum ,so this type of generators are called as Non-Uniform
flux distribution.
The maximum possible speed is 600-750 rpm

9. NON-SALIENT POLE TYPE….
It is made up of mild steel and outer surface is slotted to accomadate to
house field winding
2/3 rd of surface is slotted for field winding
It has shorter diameter and longer axial length hence the air gap in between
rotar and stator is uniform hence the flux distribution is also uniform.
This type of rotar can be stand for high speed.

10. APPLICATIONS….,
• These are used at hydro power plants..
• Ans also used at thermal, gas power plants..

11. THANK YOU…..