Eddy-current retarders for motor vehicles whose stator comprises a ring of electro-magnets

Abstract From the Canadian patent

An eddy-current retarder or speed reducer for vehicles. The device includes a stator and a rotor. The stator comprises a ring of electro-magnets mounted on a transverse common support each electro-magnet comprising a core surrounded by a coil of wire and a polar piece inserted in the axial end of the core. The rotor comprises a disc composed of ferro-magnetic material mounted to rotate facing each ring of polar piece. Each coil is entirely enveloped in a case of hard insulating material moulded thereon and this case is wedged angularly on a support by cooperation of bosses moulded therewith and notches or other depressions hollowed out in the support.