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Friday, July 11, 2014

Construction details of synchronous generator

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

  1.       Salient pole type
  2.       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

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