The invention provides a liquid cooling auto-excitation-type
eddy current retarder without an electric
brush structure and belongs to an auxiliary braking device for retarding a vehicle. The
eddy current retarder provided by the invention comprises a
retarder rotor, a retarder
stator, a control module and a generator device, wherein the retarder rotor consists of a retarder coil, an electromagnetcore and a core
retainer; the retarder coil is wound on a coil frame, and the
electromagnet core is inserted into the coil frame; the
electromagnet core, the retarder coil and the coil frame are uniformly distributed on the circumference of the core
retainer; the retarder rotor is connected with a transmission shaft, and the inner circle of the retarder
stator and the excircle of the electromagnetic core of the retarder rotor are coaxial; and the generator device comprises a generator exciting winding, a generator excitation magnetic pole, a generator armature winding and a generator armaturecore and positioned in the retarder rotor. Compared with the traditional
eddy current retarder, the eddy current retarder provided by the invention has the advantages of better safety, high reliability, no need of maintenance, compact overall structure, small volume and weight, and easiness for realization of
intelligent control on the
brake torque and constant-speed cruising of the retarder.