construction of an AC generator
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Construction of AC Generator:
An AC Generator essentially consists of two main parts: Stator and Rotor. Stator is the stationary part of machine whereas rotor is rotating part. A prime mover is coupled to this rotor to supply mechanical energy.
Stator:
Stator is stationary component on which armature winding is wound. Armature winding is the winding which carries load current. Here load means any device or equipment which consumes electrical power. This stator is stack of laminated steel assembled to form a cylindrical structure. Steel lamination are used to minimize the eddy current loss.
Slots for housing stator winding (armature winding) are cut along the periphery of the stator.
Rotor:
Rotor is the rotating component of AC Generator. It is also made of laminated steel. DC Field winding or exciting winding is wound on the rotor to create magnetic poles i.e. North and South Poles. This exciting winding is supplied DC current through an assembly of slip ring and carbon brush.
There are basically to designs for rotor. One is Salient Pole Rotor and another is Cylindrical Rotor.
Saliency itself means “projecting outward”. This gives some idea of design feature of salient pole rotor. In salient design, rotor poles project outward as shown below.
Salient Pole Rotor of AC Generator
The field winding on salient pole rotor is concentrated winding. In Cylindrical Rotor, field winding is distributed winding.
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