Difference Between Single Phase and Three Phase Motor

Single Phase and Three Phase Induction Motor Difference

Contents

The Key Difference Between Single Phase and Three Phase Induction Motor is that Single phase motors usually operate on a single power source whereas Theree phase motors operate on a three phase source power.

Factors	Single Phase	Three Phase
Supply	Single phase supply	Three phase supply
Stator	Two winding are placed. Main & Auxiliary	Three winding are placed. R-Y-B
Rotor	Only Cage rotor used.	Cage or Wound rotor used.
Features	Simple in construction, reliable and economical as compared to 3-(1) IM.	Complex in construction and costly.
Maintenance	Single Phase easy to repair and maintain.	Three Phase hard to repair and maintain.
R.M.F	2-Ø ununiform rotating magnetic field is produced as α≠90 degree always.	3-Ø rotating magnetic field of constant magnitude is produced.
Starting	Not-Self Started. Aux wdg used for starting	Self-Started machine.
Starting torque	The starting torque is low. Zero without auxiliary winding	The starting torque is high. even more with wound rotor
Efficiency	Single Phase Efficiency is less	Three Phase Efficiency is high
Efficiency is high	Single Phase Power factor is low	Three Phase Power factor is high
Application	They are mostly used in domestic appliances such as mixer grinders, fans, compressors, etc	Three phase induction motors are mostly used in industries.