Answer / p.jaya senthil nathan

synchronous can run in lag lead and unity power factor but
induction motor run only in lagging power factor.

Answer / arpit

synchronous motor is not self starting while induction motor is self starting...

Answer / arun

THERE R MANY DIFFERENCE IN SYNCHRONOUS AND INDUCTION M/C
1)IND M/C IS SELF STARTING E.G.3 PH INDUTION MOTOR
BUT SYNCHRONOUS M/C NOT.
2)SYNCHRONOUS M/C RUNS ON SYNCHRONOUS SPEED WHILE IND. M/C LESS THAN SYN SPEED.
3)SYNCHRONOUS M/C CAN WORK ON LEADING AND LAGGING BOTH BUT INDUTION M/C ALWASY RUNS ON LAGGING PF.
4)EFFICINCY AND COST BOTH OF SYNCHRONOUS M/C IS MORE THAN INDUCTION M/C OF SAME RATING.
5)INDUCTION M/C IS SINGLY EXCITED BUT SYCHRONOUS M/C (ONLY MOTOR NOT GENERATOR) IS DOUBLY EXCITED .

Answer / k.prakashchandra

Synch motor requires DC excitation

Answer / gogarlatatarao

Forget about slip first of all..
In synchronous motor the stator and room are magnetically locked, means production of exact opposite pole on room with respect to stator are produced.
Stator speed=rotor speed


But in case of indication motor it works on induction principle..
I.e to rotating rotor same poles will create on both stator and rotor. Thus stator opposite the rotor thus it will starts to rotating.
Stator speed =/>/< rotor speed. Based on application

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