Telma retarder
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A Telma retarder is frictionless electromagnetic braking system made by Telma, a company that is part of the Valeo group, a French automotive components manufacturer. A Telma retarder is an eddy current brake system.
The system works by sending an electric current to coils with alternating polarities which create an electromagnetic field. Eddy currents are generated in two rotors as they pass through this field slowing their rotation, and slowing the driveshafts attached to them. The stator houses the electromagnetic coils and is attached to the chassis, the transmission, or an axle of the vehicle. Round discs called rotors are attached to the driveline. A thin air gap is maintained between the rotors and the coils. In normal operation, this turns freely. But when electric current flows through the coils, eddy currents are created that slow the rotors, and the driveline.
