MotorsQuestion 1244 of 1506

What maintenance items does a squirrel cage motor avoid compared with a DC motor?

  1. Bearing grease and housing cleaning
  2. Winding insulation and varnish checks, with a megohmmeter
  3. Brushes, commutator work and graphite dust
  4. Shaft alignment and coupling checks
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Correct answer: Brushes, commutator work and graphite dust

The cage rotor has no commutator, so there are no brushes or commutator wear.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.7: Tesla Polyphase Induction Motors

Practice motors

Questions last reviewed: 18 October 2026