The authors derive closed-form eddy-current formulas for a spinning brass disk or ring in an anti-symmetric magnetic field and match a measured spin-down time to within 8.61% after calibrating friction.
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An Analytical Approach to Eddy Current in Electromagnetic Damping
The authors derive closed-form eddy-current formulas for a spinning brass disk or ring in an anti-symmetric magnetic field and match a measured spin-down time to within 8.61% after calibrating friction.