The synchronous speed for an electric induction motor is determined by the power supply frequency and the number of poles in the motor winding and can be expressed as:
n = f (2 / p) 60 (1)
where
n = shaft rotation speed (rev/min, rpm)
f = frequency (Hz, cycles/sec, 1/s)
p = number of poles
Example – Speed of Electric Motor with Two Poles
A motor with two poles is supplied with power with frequency 50 Hz (1/s). The rotation speed can be calculated as
n = (50 1/s) (2 / 2) (60 s/min)
= 3000 rpm (1/min)
06.09.17
