Construction details of synchronous generator
Consists
of two parts namely stator and rotor
Stator
- Laminated core with slots to hold the armature conductors.
- Laminated construction keeps eddy current losses to be minimum
- Made up of material like silicon steel to reduce hysteresis losses
Rotor
Two
types
- Salient pole type
- Non salient pole type
Salient pole type
Non-salient pole or Smooth cylindrical
rotor
Difference between salient and
cylindrical rotor
SI.NO
|
Salient
pole type
|
Smooth
Cylindrical type
|
1
|
Poles
are projected out from surface
|
Poles
are not projected
|
2
|
Large
diameter, small axial length
|
Small
diameter, large axial length
|
3
|
Air
gap is non-uniform
|
Air
gap is uniform
|
4
|
Mechanically
weak
|
Robust
|
5
|
Preferred
for low speed alternators
|
Preferred
for high speed alternators
|
6
|
Prime
movers used are water turbines, IC engines
|
Prime
movers used are steam turbines, electric motors
|
7
|
Damper
winding is provided
|
Damper
winding is not necessary
|
8
|
For
same size rating is smaller than cylindrical type
|
For
same size rating is higher than salient pole type
|
