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WHY EXCITATION OF SYNCHRONOUS MACHINE IS DC NOT AC
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Answer / k.prakashchandra
You can not have fixed north and south poles in the field
with AC
| Is This Answer Correct ? | 44 Yes | 5 No |
Answer / raja
When ac supply is provided, the poles will alternate between north and south pole for each half cycle of supply. so there wont be any magnetic interlocking with stator to run at synchronous speed as the polarity changes at the rate of supply frequency. hence for magnetic locking DC supply is used for excitation
| Is This Answer Correct ? | 18 Yes | 0 No |
the working principle of syn/mac. is mag. locking which is
not possible in ac
| Is This Answer Correct ? | 9 Yes | 1 No |
Answer / lokesh
We need a statoinary magnetic flux in synchronous machine,
this flux will be cut by the rotor.
| Is This Answer Correct ? | 7 Yes | 7 No |
Answer / anil
Yes we can have a ac in rotor.But then we will not call it as a rotor.It will be stationary but this rotor has to be connected to a 3phase supply .Then it will produce a rotating magnetic field which will interact with the stator and create emf.
| Is This Answer Correct ? | 0 Yes | 3 No |
Answer / shailesh_358
DC excitation provides high starting current required for
excitation
| Is This Answer Correct ? | 2 Yes | 15 No |
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