Double Rotor Disc Style Magnet Retarder Electromagnetic Structure Design And Experiment

Permanent magnet retarder is a new non-contact braking device, having the advantages of no power consumption, energy saving and environmental protection, no maintenance, it can effectively share the load brake friction braking device, improve the friction braking device service life, reduce car use and maintenance costs, and improve the driving safety of cars and agricultural vehicles.In this paper, a double rotor disc style permanent magnet retarder structure was designed, which combined with the structure and performance characteristics of the permanent magnet retarder and electric eddy current retarder, and a3D model of double rotor disc style permanent magnet retarder was established. The braking torque calculation formula was derived by using the equivalent magnetic circuit method, and it was concluded that braking torque has relationship with the air gap width, the thickness of the pole piece and the rotor disc, the size of the permanent magnet structure, permanent magnet excitation performance and the rotor disc material etc.. The braking torque of regression equation was obtained by using uniform design table U*16(1612) arranged simulation test. When the structural parameters g=0.6mm, h1=6mm, h2=23mm, h3=8mm,1=150mm,θ=18.5°, the maximum braking torque was3228.8(±86) N*m. Through analyzing the braking torque factors, it is concluded that the permanent magnet central angle0effect on brake torque is the largest, the thickness of the pole piece h1minimum impact on the braking torque. In order to get the air-gap magnetic field distribution and braking torque variation law, a double rotor disc style permanent magnet retarder physical prototype was design and a verification test rig was built to measure the physical prototype air-gap magnetic induction intensity and braking torque. Physics and simulation test results showed that the average error of the air gap magnetic induction intensity was less than3.6mT, and the braking torque error was less than7.5%. Simulation results were in conformity with physical test results. Double rotor disc style permanent magnet retarder structure design was reasonable. It is provide a reference for further research.