The formula to calculate the frequency of an alternator is:
f = (P × N) / 120
Where: f = frequency in Hertz (Hz) P = number of poles N = rotational speed in revolutions per minute (RPM)
In this case, we have: P = 6 poles N = 1500 RPM
Therefore, the frequency of the 6 pole alternator running at 1500 RPM is:
f = (6 × 1500) / 120 f = 9000 / 120 f = 75 Hz
So, the frequency of the 6 pole alternator is 75 Hz.