Chapter 19 - Single Phase AC Motors

Question 1

State two types of single phase Induction Motors?

Answer 1

1. Split Phase Motor.
2. High resistant Start Motor.
3. Capacitor Start Motor
4. Capacitor Start & Run Motor.

Question 2

How does the Direction Of Rotation remain Unidirectional in a Universal Motor?

Answer 2

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Question 3

What type of Single Phase AC Motor would be used where a more or less constant speed is required?

Answer 3

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Question 4

How Does a Capacitor Start Single Phace Induction Motor work?

Answer 4

• The Capacitor Start Single Phase motor works by phase splitting
• The Capacitor Phase Shifts the supply to the aux winding’s by 90 degrees
• This Phase shift to the Aux Windings is only need on startup and can be turn of with the use of a centrifugal switch
• D.O.R is determined by the manner in which the auxiliary winding is electrically connected in the circuit.

Question 5

Explain All components In a Capacitor Start Single Phase induction Motor?

Answer 5

1. The Main Winding use to create magnetic flux for rotation of the rotor
2. The Capacitor which phase shift the supply to the Aux winding by 90 degrees
3. The Aux winding setup the magnetic field to aid starting of the motor
4. Rotor, which get an induced emf from the main winding and aux winding (on startup)
5. there maybe a cenrifugal switch to isolate the aux winding when motor as reached a fast enough speed for the main winding to take over.