Structure Design And Optimization Of New Permanent Magnet Retarder

The permanent magnet retarder(PMR)is an energy-efficientand environment-friendly auxiliary braking device,which has the advantages of light weight,energy saving and environmental protection,continuous use of its own and will not overheat,can maintain the stability and durability of braking force.But the existing permanent magnet retarder has some shortages.The specific performance compared with the eddy current retarder,under the same volume,the braking torque of permanent magnet retarder is small,some problems of magnetic flux leakage exists in some permanent magnet retarder structure,which largely limits its application.This paper introduces the structure,working principle and installation and operation mode of permanent magnet retarder in detail.On this basis,a new type of permanent magnet retarder is proposed,and the working mechanism of the new permanent magnet retarder is described.The mathematical model of new permanent magnet retarder is established,and the calculation formula of braking torque is derived by using the source and field theory.The correctness of the formula is verified by the prototype test.The influence of the structural parameters on the braking torque is analyzed,and the relationship between the structural parameters is put forward.Based on this,the optimal target equation of the structural parameter design is established,which can be used to guide the design of the new permanent magnet retarder.The correctness of the derived formula is verified by experiments.By means of three-dimensional static analysis and dynamic analysis,the distribution of magnetic field and the speed-braking torque characteristic curve are obtained,it is verified that the new permanent magnet retarder can increase the braking torque.