Question

What is a split-phase motor?

Answer 1

A split-phase motor is a type of single-phase induction motor commonly used in small appliances like fans, pumps, and small machinery. It is called "split-phase" because it has two windings (or coils) that create a phase difference to help start the motor and keep it running.

Here’s how it works:

1. Main Winding (or Run Winding): This is the primary winding that stays energized when the motor is running. It provides the continuous magnetic field for the motor.
   

1. Starting Winding (or Auxiliary Winding): This winding is used only for starting the motor. It creates a phase shift, which helps the motor to start turning. Once the motor reaches a certain speed, the starting winding is disconnected, typically through a centrifugal switch.
   

The phase difference between the two windings (created by using different types of windings and sometimes different numbers of coils) creates a rotating magnetic field, which is what allows the motor to start and rotate.

In summary:

1. The motor uses two windings to create a rotating magnetic field.
   

1. The starting winding is only active at startup and is disconnected when the motor is running.
   

1. It is simple, reliable, and commonly used in low-power applications.
   

This type of motor is called "split-phase" because the two windings are out of phase with each other, helping the motor start efficiently.