Difference between Induction motor and Synchronous motor


In this article we are going to discuss about the difference between induction motor and synchronous motor . Both are an electrical motor but there are some difference between them.


differece between induction motor and synchronous motor, difference between synchronous motor and induction motor

Difference between Induction motor and Synchronous motor

              Induction motor
       Synchronous motor
1.       Induction motor always operates at less than synchronous speed.
RPM = 120F/p - Slip
Synchronous motor always operates at synchronous speed. 
RPM = 120F/p
2.       In this type motor Slip is not being zero so its rotate always  at less than synchronous speed
In this type motor Slip is negligible so it always rotate at synchronous speed
3.       Induction motors don’t need DC excitation to be supplied to the rotor.
In synchronous motor required DC excitation for rotor.
4.       In induction motor don’t required  slip ring and brushes  for rotor excitation
In synchronous motor required slip ring and brushes to supplied the rotor excitation
5.       In Induction motor does not required additional equipment for get synchronous speed
In synchronous motor most additional equipment required to get synchronous  speed
6.        Induction motor is generally less efficient than synchronous motor
 It is generally more efficient than induction motor
7.       Its rotor required DC power
Its rotor does not required DC power
8.       Induction motor is less costly than synchronous motor
synchronous motor is more costly than induction motor
9.       It is singly excited machine , for excitation its stator connect from AC source
It is doubly excited machine
10.    It has its own self-starting  torque
 It has not its self-starting  torque
11.   Induction motor always run at lagging power factor
Synchronous motor does not always run at lagging power factor. it run at lagging , leading and unity power factor according to excitation.
12.   In  Induction motor always
Running speed < synchronous speed
In synchronous motor always
Running speed = synchronous speed
13.   Induction motor is not synchronous motor
But synchronous motor is an induction motor .it is main difference between induction motor and synchronous motor

These are some difference between induction motor and synchronous motor. If you find incorrect above please comment in below.