¿How does it work?

The FRENELSA electric retarder is based on Eddy currents.

It is made up of two parts:

Stator: static part equipped with a set of electric coils.
Rotors: turning parts that absorb and dissipate the kinetic energy of the braked system.

Electric current create magnetic fields when passing through the coils.

When rotors turns inside the magnetic fields, Eddy currents appear.

Eddy currents create forces opposing to the movement of rotors.

Kinetic energy is transformed into heat in the rotors and dissipated through their vanes.