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The commutator motors are so called because the wound rotor of this kind of motor is equipped with a commutator and brushes. This group consists of the following two classes:

  1. Those operating on ‘repulsion principle’ (repulsion motors) in which energy is inductively transferred from the single-phase stator field winding to the rotor.
  2. Those operating on the principle of the series motor in which the energy is conductively carried both to the rotor armature and-its series-connected single-phase stator field.