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The chief maintenance requirement of a cage induction machine is

  • A.renewal of the brushes and their spring pressure
  • B.lubrication and inspection of the bearings
  • C.regular replacement of the rotor bars and end rings
  • D.dressing of the commutator surface at intervals

Answer: B

Correct answer: lubrication and inspection of the bearings

With no brushes, no commutator and no rotor connections, the only wearing parts of a cage machine are its bearings, and they account for the great majority of failures in service. Beyond keeping them lubricated and the enclosure clean so the machine can cool, there is very little to do.

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