The invention relates to an
eddy current retarder device based on the magnetorheological effect. The
eddy current retarder device comprises rotor discs, a
stator assembly, a transmission shaft and
magnetorheological fluid. The
stator assembly comprises a bearing sleeve,
stator shells and the like and is located in the middle, the two rotor discs are placed in the stator shells on the two sides of the stator
assembly respectively, and gaps between the shells and the rotor discs are filled with the
magnetorheological fluid. Eight excitation devices are respectively fixed to the inner side shell of the stator shells on the two sides. Through the structure, air gaps between rotors and a stator are replaced by the
magnetorheological fluid with high magnetic permeability and low electrical
conductivity, and therefore
magnetic circuit magnetic resistance is reduced; meanwhile, under the
magnetic field effect, the magnetorheological fluid is converted from
Newtonian fluid with low
viscosity into Bingham fluid with high shear yield stress. In the
brake process, the
brake torque generated by eddy currents and the
brake torque generated by the magnetorheological fluid act at the same time. The
eddy current retarder device with the structure has the advantages of being capable of saving energy and
electricity, small in coil heating amount, large in
brake torque, and good in
brake torque controllability and low-speed performance.