Discussion
Which of these is NOT part of a three-phase induction machine?
Answer: A
Correct answer: A commutator with brushes running upon it
A commutator belongs to the dc machine, where its job is to reverse the armature connection mechanically. An induction machine needs no such thing: the stator field revolves of its own accord and the rotor current is induced rather than supplied. Even the wound rotor uses slip rings, which are continuous, not a segmented commutator.
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