The DHQ series has five models. DHQ series eddy current retarder suitable for urban buses and medium- and light-duty vehicles with short rear suspension and unable to shorten the drive shaft. It is characterized by its light weight and low power consumption. The 12 coils are distributed radially, the installation size is small, and the low-speed performance is good. The excitation gap does not need to be adjusted, and a small amount of string movement along the axial flange does not affect the use. The rotor adopts a single-rotor drum structure and is cast with special high-temperature alloy, which is light in weight and small in deformation.