A magnetic brake consists of a permanent magnet, which induces currents in a rotating copper disk. The resulting eddy currents interact with the magnetic flux to produce Lorentz forces and subsequently a braking torque.This 3D problem is solved using a stationary formulation for the electromagnetic field coupled to an ordinary differential equation for the rotational rigid body dynamics.The model also illustrates the proper use of a Lorentz type induced current density term. Furthermore, an ungauged A-V formulation is used to solve the electromagnetic part in a fast and memory-efficient way.
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