Synchronous Speed
The "synchronous speed" of a synchronous motor is the rate of rotation in RPM of the stator magnetic field. After startup it is also the rotation rate of the motor:
where is the frequency of the AC supply current in Hz and is the number of magnetic poles per phase. For example, small 3-phase synchronous motors usually have 6 poles organized as 3 opposing pairs at angles of 120°, each pair powered by one phase, so p = 2 per phase. Thus for 60 Hz supply current the synchronous speed is 3600 RPM. (N.B. 'p' can also refer to pole pairs, in which case the equation becomes: Speed of rotation = 60 x f / p).
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