Question

What are the differences between singly excited and doubly excited systems?

Answer 1

Single excited - only stator is fed with 3 ph balanced supply, the stator field starts rotating with synchronous speed inducing a rotating field in rotor. And as rotor is shorted it starts rotating in the same direction following Lenz's law.

Doubly excited - Both stator and rotor are fed with 3 ph supply.

Answer 2

the only difference is the number of pointers that they store.
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