Example
Design an electric motor that has a power of 1/2 hp when it rotates at a frequency of 120 Hz (120 cycles/sec * 60 sec/min = 7200 rpm).
Pavg = 0.5 hp* (746 Watts/1 hp) = 373 Watts.
Design = ? (This means we specify N, A, I and B such that P = 373 Watts when f=120 Hz. We have some “free” choices!)