Induction Motors vs Synchronous Motors-A comparison

	Induction Motors	Synchronous Motors
Speed	The speed varies below the synchronous speed and can be adjusted	The speed is constant and rotates at the synchronous speed
Construction	Simple and Rugged Construction	A slightly complex construction
Starting	It is self starting	Special Starting Procedures are required
PF control	Cannot be used for PF improvement	Can be used for PF improvement
Excitation	Does not require external excitation	Requires DC excitation for rotor
Efficient	Less Efficient	More Efficient
Cost	Cheaper	More expensive