Research On Electromagnetic Liquid-cooled Retarder With Embedded Rotor

With the development of road traffic and automobile technology in our country,the requirement of automobile braking performance is higher and higher,but the main braking the vehicle is still friction brake mode.When the main braking frequent or continuous work,the temperature of brake drum and brake hub increased significantly,the friction factor reduced,brake performance decreased,causing serious security risks.As an no-friction auxiliary braking device,retarders can bear about 30%-80% of the required braking energy when the vehicle is decelerated or braked,which avoid the total or partial loss of braking performance due to high temperature,reduce the main braking wear and maintenance costs.Retarder has attracted more and more attention because of the outstanding performance in safety,energy saving and environmental protection and it is important for its research.The eddy current retarder has become the main products on the retarder market in China because of its fast response,good braking performance at low speed and high cost performance.However,the traditional eddy current retarder has a severe heat recession and poor continuous braking performance due to air cooling mode used in heat dissipation.The water-cooled eddy current retarder,which is still in the research at present,has solved the problem of heat recession,but the inertia and the dynamic load are large,which has certain influence on the transmission system.In view of these problems,a new type of eddy current retarder called electromagnetic liquid-cooled retarder with embedded rotor is proposed in this paper,which has the advantages of simple structure,high reliability,small heat recession,small installation space and small moment of inertia.This article has carried on the systematic research to this kind of new retarder,and made many important achievements,the main content and the chapter constitution as follows.In the first chapter,the research background and significance of retarder is introduced,and then summarizes the development trend of eddy current retarder and propose electromagnetic liquid-cooled retarder with embedded rotor on the basis of current research.The second chapter mainly introduces the working principle of the new retarder.Firstly,the four mounting positions of the retarder are introduced.Then,the advantages and disadvantages of the existing eddy current retarder and the new retarder proposed in this paper are compared.Finally,the operation mode and control way of the retarder are introduced.In the third chapter,the theoretical analysis of the proposed new retarder is carried out.Then the finite element analysis of the electromagnetic properties is carried out by Jmag-designer simulation tool.In the fourth chapter,the Jmag-designer finite element analysis software is used to optimize the design.First,Take the axial force as the goal of optimization to find the ways to reduce the axial force;And then take the braking torque as the goal to determine the key structure and size;Finally,the braking performance curve of the optimized retarder is obtained by finite element analysis.In the fifth chapter,the application range of this structure is extended to the field of carrier aircraft brake,and a arresting cable system is designed.The braking performance curve of the brake of the arresting cable system is obtained by finite element analysis.Based on this,the braking time and braking distance are calculated to verify its feasibility.In the sixth chapter,the bench test of electromagnetic liquid cooling retarder with embedded rotor is introduced.The correctness of the simulation analysis and the rationality of the design are verified by experiments such as no-load lost torque test,braking torque test and continuity test of braking.Finally,the dissertation conclusion and future research outlook are proposed.