In separately excited m/c,we excite the field by a dc source,what not with ac s

In separately excited m/c,we excite the field by a dc
source,what not with ac source?

Question Posted / anil

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In separately excited m/c,we excite the field by a dc source,what not with ac source?..

Answer / meenakshi

in order to have stationary poles (fixed N and S),we use dc
source.

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