The real issue is whether and at what rate the Earth's molten iron core is cooling. Once it drops below some threshold (? kelvin) the magnetic field will be inadequate to maintain a liveable atmosphere or protect us from solar radiation. Earth will evolve into another dead planet like Mars...
For a useful and cheap graphical tool for troubleshooting/debugging check out ww.openmodelica.org or www.scicos.org - this is free download sophisticated industrial modeling tools used by Ford and others for research and design of complex electrical/mechanical systems. You'll get real numbers...
What are your voltage goals? What are the strengths of these magnets?
Are you actively sampling/taking field/flux measurements?
Have you used any sw tools for modeling analysis? Have you tried or
succeeded with a scaled down version of this rotor? Are you
familiar with the...