Motion induced eddy currents

Thomas Müller
Rotating disc with electrical conductivity below permanent magnets.
Carmen, Elektra VL
Eddy current brake
screenshot: screenshot1.png


This model consists of a rotating disc with magnetic and electric conducting material below several alternating oriented permanent magnets. These magnets induce eddy currents in the rotating disc which interact with the magnetic flux to produces Lorentz forces and subsequently a braking torque.

This 3D problem can be solved in two ways with Opera. Either with the transient rotating machines solver CARMEN or with the ELEKTRA VL solver.

The transient CARMEN solution will take some timesteps to reach a steady state. This can be significantly accelerated by ramping the speed for a few timesteps or ramping the electrical conductivity in the disc or both and by changing the length of the timesteps during the ramp time.

Torque with and without ramp in speed or conductivity

The ELEKTRA VL solution will take usually more nonlinear iterations to reach convergence, but since it's only one solution it will be faster compared to the several timesteps in CARMEN to reach steady state.

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