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Model ID: 2014

A 3D Simulation of a Magnetic Brake in Action

A magnetic brake consists of a permanent magnet, which induces current in the conductive material of a rotating disk. The resulting eddy currents interact with the magnetic flux to produces Lorentz forces and subsequently a braking torque.

In this model, a copper disk is spinning in a magnetic field. 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.

The eddy current magnitude and direction at t = 0 s.

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