Large Size Synchronous Machines

Why almost all large size synchronous machines are constructed with rotating field system type?

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vishnukumart

  • Oct 29th, 2009
 

In large type of machines the currents are high so tapping those currents from the rotating armature is difficulty in the point of view of brushes and sparks over there. So we keep armature in rest and to have the mechanical movement btn the field and armature conductor we do field rotating.

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veerateja

  • Jul 11th, 2010
 

Large size synchronous machines or Alternators have rotating field winding on rotor for many reasons of them the important reasons are:-

1. The rotor can rotate at very high speeds.
2. The voltage reguired to field excitation of rotor is from 0 to 600V it depands on alternator KVA, since the DC voltage is less we can easily insulate the armature winding.

Rhombus

  • Jun 11th, 2011
 

All the large size synchronous machines have rotating field winding because in the other case where armature is rotating we require four slip rings.. but in case of rotating field we can do with only..2 slip rings..!! :):)

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