If a metal plate (brake fin) moves through a magnetic field, a current is induced in this plate. This current flow is closed like a vortex, hence the term eddy current.


The eddy current in turn generates its own magnetic field, which interacts with the primary field. This creates forces that counteract the direction of movement of the metal plate. In this way, the movement of the plate is slowed down.

The kinetic energy of the vehicle is converted into the heating of the metal plate. The metal of the brake fin opposes the flowing eddy currents with its specific electrical resistance, which heats the metal.

The braking force depends on the speed of movement (i.e. the speed at which a vehicle enters the brake) and on the material of the brake fin.