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Electromagnetic actuation (Magnetodynamics)

Magnetic induction, temperature distribution and displacements field due to electromagnetic actuation

Magnetic induction,
temperature distribution and
displacements field due to
electromagnetic actuation

This last application is the simulation of the electromagnetic actuation of a very small conductor pipe with ellipsoidal cross-section. This kind of actuation allows for example to control a fluid flow passing through the pipe by sequencing the different coils placed along the wall.

By discharging capacitances in the coils, it is possible to make a fast varying current flow through them. This current creates itself a fast varying magnetic field responsible for the creation of eddy currents in the conductor pipe. These currents have two effects. Firstly, they cause power dissipation in the pipe by joule effect, resulting in a rise in temperature and so in a thermo-mechanical expansion. Secondly, because we have eddy currents in a magnetic induction, Lorentz forces tend to deform the pipe (here to repel the wall of the pipe from the coil).

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