Design Of The Eddy Current Retarder For The Bus And Study On The Temperature Field Of The Rotor Disk

In today's society,people have higher and higher requirements for the safety performance of.The application of the bus eddy current retarder has been unprecedentedly popular.It is an ideal auxiliary deceleration method for the bus,with good braking performance and economical environmental protection,fast response and other characteristics.Since the bus eddy current retarder plays an increasingly prominent role in ensuring the safe driving of the passenger car,a reasonable selection of the bus eddy current retarder can not only prolong the service life of the vehicle,but also further improve the safety performance of the vehicle.This paper will focus on the calculation of braking torque of eddy current retarder,the influence of key structural parameters on air gap magnetic density,braking performance and the temperature field of rotor disk.The research content is divided into the following aspects:1.This paper summarizes the research work of domestic and foreign scholars on eddy current retarder,calculates the product size of eddy current retarder based on automobile theory,considers the influence of temperature on material conductivity,and deduces the calculation model of braking moment by eddy current baffle algorithm.According to the product size,the bench test shows that the model is more in line with the actual situation,and can guide the development of eddy current retarder.2.According to the theoretical design dimensions,a three-dimensional transient simulation model of the eddy current retarder for the bus vehicles is established.The variation of air gap magnetic density,rotor disk eddy current distribution and braking torque is analyzed.The magnetic pole area is studied.The influence of the excitation current,the length of the air gap and the thickness of the rotor disk on the magnetic gap and braking torque of the air gap can achieve the purpose of optimizing the performance of the retarder by selecting appropriate parameters.3.Firstly,the internal heat source of the rotor disk is analyzed.Then the heat transfer theory and virtual boundary conditions are used to derive the control equation of the rotor disk temperature field.The thermal resistance model is established and the distribution of rotor disk temperature with the thickness of the rotor is analyzed.The eddy current retarder AVL test rig was built,and the relationship between rotor disk temperature and braking torque was obtained,and the numerical analysis results and test data curves were compared.The results show that the thermal resistance model can provide a reference for the design of the retarder.