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The rotor of a cage induction machine consists of

  • A.permanent magnet material bonded to a steel hub
  • B.bars in slots short-circuited by end rings
  • C.a three-phase winding brought out to slip rings
  • D.a direct current field winding on salient poles

Answer: B

Correct answer: bars in slots short-circuited by end rings

The cage is the simplest rotor there is: uninsulated bars, usually aluminium cast in place, joined at both ends by rings. It carries no external connection, has nothing to wear, and its ruggedness is the reason the cage machine is the most common electrical machine in industry.

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