How do I calculate brake force for an eddy current brake?

[Paul1999]

TL;DR Summary

I try to calculate brake force for primitive eddy current brake, but I have problem with determining the frequency (skin depth) and characteristic length (magnetic Reynolds number)

Hello everyone, I try to calculate brake force for primitive eddy current brake, but I have problem with determining the frequency (skin depth) and characteristic length (magnetic Reynolds number). I attach the equations and a scheme of the model.

 

[Tom.G]

See this thread and the references therein:
https://www.physicsforums.com/threads/braking-force-from-eddy-currents-on-a-rotating-disk.943262/