In a split-phase motor, the main winding is of

In a split-phase motor, the main winding is of

Right Answer is:

Thick wire placed at the bottom of the slots


In a split-phase motor, the main winding is of thick wire placed at the bottom of the slots.

Split-Phase Motors

  • Split-phase motors receive their name from the manner in which they operate, based on the principle of the rotating magnetic field.
  • A rotating magnetic field cannot be produced with only one phase.
  • The current is split through two separate windings with a phase displacement, which acts like a 2-phase system.
  • A rotating magnetic field can be produced with a 2-phase system. Split-phase motors start as 2-phase motors by producing an out-of-phase condition for the current in the run winding and the start winding.
  • The starting winding is wound in the same slots of the stator poles as the running windings.
  • This starting winding is displaced 90 electrical degrees out of phase with the running winding and creates a phase displacement that provides enough starting torque to start the motor.

  • A startup winding, also known as the auxiliary winding, is used to create the torque needed to start a single-phase induction motor.
  • The starting winding is of higher resistance made up of thin wire and occupies a smaller area than the running winding.
  • In comparison, the running winding is made up of thick wire of low resistance and high inductance,  running winding has heavier gauge wire and more turns than the starting winding.
  • The running winding is wound in the bottom of the stator pole slots, and the starting winding is wound on top of the running winding.
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