| So, I'll do it here. He states that he has increased the rotor winding length by a factor of three. Assuming he used the same diameter wire, he also increased the rotor resistance R by a factor of three. Since he has more turns of wire he needs less current to get the same magnetic flux, since the flux is essentially proportional to the number of turns times the current. Consequently, he needs about 1/3 the current for the same flux. Since the power dissipated by the rotor goes as I^2xR, he now needs to provide about 1/3 as much power to provide the same excitation. O.K. This is a gain. Less power in for a given output. Although he can now, in principle, use more current than was possible before, it's not likely he will see much benefit, since one can not drive the magnetic flux beyond saturation.
THE simplest way he could deal with the rpm issue would be to use some sort of transmission. Beyond that he has options involving bringing out the stator windings directly. He could then, for instance, rectify each winding independently and stack the outputs. It also depends on what voltage he is trying to obtain. Six volts would be attainable at lower rpms than twelve, for instance. |
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