w - angular velocity.
f - frequency (number of cycles per second, expressed in Hz).
P - number of poles (= N + S poles. ).
P/2 - number of pole pairs. Above generator example has two poles and one pole pair.
Ns - number of revolutions per second
Nm - number of revolutions per minute
Nm=60*Ns.
w=2Pi*f = (P/2) * N * 2Pi * 1/sec
f=(P/2)*N/sec
f=(P/2)*Ns
f=(P/2)*Nm/60=P*N/120
f=P*Nm/120
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