rotor. The generator was about 0.0 7 metre diameter by

0.05 meter. The rotor coil is the output coil which gives out the signal voltage V

and output current I. The stator is an electromagnet which

produced electromagnetic field intensity B. This electromagetic

field goes through the rotor output coil to produce output power V*I.

To turn the rotor at spin speed w, a torque T can be applied

to the rotor. The torque T is:

T=B.

The larger the stator's field intensity B, the larger the torque T.

The output power V*I increases faster when T is increased than when

spin speed w was increased. Then the electric ouput power should be:

V*I=T * T*w.

For example, when T=B is doubled, the spin speed w is reduced and

output power V*I increased. The T in the equation must be squared for

the increased in V*I and reduction of w. Spin speed w reduced with T=B so that

with w=1/B produces:

V*I=T*T*w=B*B/B=B

for w>0 radians per second. According to these equations, to

maximize the electrical efficiency (V*I)/(T*w) of the electric generator, the

stator's electromagnetic field intensity B=T should be maximized.