Number of Pole Pairs
nsync = synchronous speed
f = frequency of the 3-phase power supply
p = number of pole pairs of the 3-phase motor
Kindly note that the above noted relation results in revs per second if the frequency unit is Hz.
|Pole pair numbers||1||2||3||4||5||6|
|Synchronous speed (at 50 Hz) n [rpm]||3000||1500||1000||750||600||500|
|Synchronous speed (at 60 Hz) n [rpm]||3600||1800||1200||900||720||600|
The rated full-load speed of three phase asynchronous motors is, due to slip, a few percent below the synchronous speed.