Synchronous Generator: OCC & Residual Magnetism

AI Thread Summary
Synchronous generators typically do not exhibit residual magnetism in the same way as DC machines, which is evident in their open circuit characteristic (OCC) where generated EMF is zero when field current is zero. This is because synchronous machines rely on a constant magnetic field created by the rotor, and without field current, there is no induced EMF. The design of synchronous generators often incorporates exciters that can have residual magnetism, but this does not apply to the machine itself. The absence of residual magnetism in synchronous machines means they require an external power source to initiate operation. Understanding these differences is crucial for effective generator design and operation.
ranju
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Homework Statement


Is there no residual magnetism in case of synchronous machines? Actually I had this doubt because of the OCC of alternator as when the field current is zero the generated value of the machine is also zero unlike the dc machines..why is it so??

Homework Equations

The Attempt at a Solution


The OCC of a synchronous machine is plotted between the generated emf and field current ast rated speed .[/B]
 
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The exciter (DC generator) can be designed to have residual magnetism, to make the machine self-excited and eliminate the slip-rings of separately excited.
 
this doesn't answer my q. I was asking about if synchronous generator have residual magnetism?
 

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