Analysis And Research On The Electromagnetic Liquid-cooled Retarder

In recent years, the development of China’s transportation industry is raidedfastly. The car’s performance and traffic conditions have greatly improved. With thespeed of vehicles, the vehicle’s safety system energy and environmental performancestandards also have more requirements. Especially the safety issue of large vehicleshas received extensive attention. In recent years, China’s traffic laws and regulationsclearly pointed out that large passenger and freight vehicles must install an auxiliarybraking device, so as to improve driving safety factor. The auxiliary brake is not inuse or less use of the service brake condition. It is a device for vehicle to speed downand keep stable. It can prevent the car braking system overheating caused by longtime braking. In this state the car is very easy to cause the brake system performancereduce and lose efficacy. At present, the more popular centralized auxiliary brakedevice in the automobile industry are: engine braking, engine exhaust brake, eddycurrent retarder, hydraulic retarder and self-excited retarder. The most common ofthese in the industry is the eddy current retarder. But the traditional eddy currentretarder is cooled by air. It can cause the serious hate fading. Considering the coolingway, this paper presents the several electro-magnetic liquid-cooled retarder. Theelectromagnetic liquid cooled retarder was studied in the following parts:Firstly, the paper introduces the basic structure of domestic and foreign auxiliarybraking device and its working principle, and then its development trend in the futureare briefly introduced.The second chapter introduces and analyzes the structure of two salient poleselectromagnetic liquid cooled retarder and its working principle. We obtain theelectro-magnetic liquid cooled retarder advantage by compared with the traditional aircooling principle of eddy current retarder and electromagnetic liquid cooled retarder.This chapter also analysis the influence on the torque of electrical conductivity,magnetic permeability and the different materials of the stator and the rotor.The third chapter is on the basis of two salient poles electromagnetic liquidcooled retarder. This chapter put forward a kind of double stator structureelectromagnetic liquid cooled retarder. In this chapter the retarder’s structure and itsworking principle is described. We can use the JMAG software to analysis theelectromagnetic field and magnetic field. After that we can get the characteristics of distribution of magnetic and eddy current field. Several key parameters of this kind ofstructure are calculated.The fourth chapter presents a permanent magnetic liquid cooled retarder with amulti head structure. In this chapter this kind of retarder’s structure, theelectromagnetic field simulation and its working principle is described. The braketorque and brake power is calculated in this chapter. At the end of the chapter thepermanent magnet is designed and analyzed through simulation of electromagneticfield and torque.On the fifth chapter, the traditional design of air-cooled eddy current retarder andtwo poles electro-magnetic liquid cooled retarder test system is designed. Theresearch and test on the retarder is necessary. Eddy current retarder and two salientpoles electro-magnetic liquid cooled retarder continuous characteristics and speedcharacteristics are researched by experiment. The test results show that the highefficiency and lower heat fading on electro-magnetic liquid cooled retarder.The innovation of this paper lies in designing the electromagnetic liquid cooledretarder device several kinds of new structure. And the study for magnetic field andeddy current field. We obtain the advantages of the electromagnetic liquid cooledretarder brake torque, thermal decay rate, good heat dissipating effect e.g.