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Synchronous Speed When Alternating current (AC) is applied to the stator of a three phase motor, a rotating magnetic field is setup. This rotating magnetic field moves with a speed called synchronous speed. The Synchronous speed can be calculated as follows: 120 times the frequency (F), divided by the number of poles (P): The synchronous speed decreases as the number of poles increases. The table below shows the synchronous speed associated with various numbers of poles at supply frequencies of 50Hz and 60Hz: Rated Speed. The speed of operation of an AC motor when fully loaded at rated voltage is called the rated speed.
The speed of 50Hz (60Hz) 2 poles synchronous motor generator is 3000rpm (3600rpm). AC power frequency is determined by the pole number of the motor generator p and speed n, Hz = p*n/120. The grid standard frequency is 50Hz (60Hz), which is a constant value.f the motor and Pump are made for use on 50Hz power supply, then there will be much more power demanded by the load. This is because at 60Hz speed will increase by 20% and absorbed kW follows the 'Cube' of speed (given that nothing else changes).