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  1. The commutator brushes are open-circuited
  2. It is quick reversible motor
  3. It has simple structure
  4. It is a dc drive motor
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1 Answers

Option 2 : It is quick reversible motor

  • A single-phase AC motor with transformer-action coupling between the windings of the stator and rotor
  • The stator is of a non-salient pole design and has two series-connected windings, whose axes form a 90° angle
  • The rotor is similar in design to the armature of a DC machine
  • The commutator brushes are short-circuited, and the brush holder can be turned with respect to the axis of the motor
  • If the brush axis is aligned with the axis of one of the stator windings, a current is induced in the rotor winding, as in the secondary winding of a transformer
  • This current interacts with the magnetic flux of the second stator winding and creates a torque that causes the rotor to rotate
  • By shifting the brushes around the commutator, the torque can be varied from zero to a maximum value
  • Thus, different settings of the brushes are used in starting the motor, controlling the rotational speed, and reversing the motor
  • The advantage of repulsion motors is that the rotational speed can be varied within wide limits without the use of auxiliary apparatus
  • The motors have the disadvantage of being complicated in structure
  • Repulsion motors are used in low-power variable-speed single-phase AC drives
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