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Interesting. If you don't mind my asking, would you be willing to tell the forum a bit more about your problem? In most cases, a physically-rotating magnet would not spin so fast that radiation would become an important consideration. That is, the time-varying local EM fields could be computed in a conventional quasi-static manner quite accurately. And even if you could spin a physical magnet as fast as, say, 100,000 RPM, the wavelength of the resulting free-space radiation would still be 3 km. And at 10,000 RPM, the wavelength would be 30 km. So in most everyday situations, the local-field interactions (e.g., anything within a 100 meters of your magnet) would probably be of far more interest to you than the radiated fields.

Are you, by some chance, attempting to model something more exotic than just an everyday permanent magnet -- such as a rotating black hole or neutron star, a fundamental particle, or something like that? Are you speculating that large rotating magnets could somehow be applied in VLF communications (such as with submarines)? Or... might your question be just a hypothetical physics problem, such as for a physics class discussion? Just curious. Best regards.

You could calculate the (static) magnetic dipole moment and then go into emw, set up two perpendicular magnetic point dipoles 90 degrees out of phase.

D.W. Greve
DWGreve Consulting

Thank you for your answer Mr Robert Koslover,

I have been aware of the problems you mentioned. It's just a crazy idea about something but it's soon to talk about it. It's mostly curiosity.

Thank you for the answer, Mr Greve!

You would you mind giving me some more details if possible?
Thank you in advance!