The synchronous speed can be calculated as. The required speed can be achieved by adjusting number of magnetic poles of stator of an AC synchronous motor. If it did - the rotor would appear to be stationary to the rotating stator field since it would rotate with the same speed.
The synchronous speed is given by.
The number of poles is the total count of magnetic poles placed in a stator to produce a rotating magnetic field. How To Calculate A Synchronous Speed Of A Motor - Engineering Discoveries. 120 is a constant that gives your answer in revolutions per minute. The following formula can be used for the calculation.