Study Of 3D Magnetic Field And Its Application Performance For Bus Electromagnetic Brake

As an ideal style of deceleration for bus, bus electromagnetic brake has many traits, such as work without contact, fast response, economic and environment friendly, easy to installation and daily maintenance. It can reduce power and noise pollution which produced in the processing of braking, reduce vehicle driving costs, improve economic benefits of customers and play an important role in the driving safety increasingly. Therefore lots of large or medium-sized passenger cars have equipped bus electromagnetic brakes. Matching bus electromagnetic brake properly can not only reduce the influence to vehicle transmission drivelines but also enhance the performance of vehicles.First, some fundamental issues of bus electromagnetic brake have been discussed synthetically, including working principle, basic structure, and installation modes and so on. By introduction of Coulomb gauges, the paper has studied Electromagnetic brake on the eddy field finite element equations and laid an emphasis on deriving Finite Element Method governing equation; By using the electric vector potential, magnetic scalar potential, the formulation has been presented and the FEM model has been built and simulated. The paper has analyzed the electromagnetic flux density, electromagnetic eddy current distribution and the changes of torque as the time. The results of calculation have achieved satisfactory accuracy under the reasonable meshing. From three aspects (oscillation of driveline, braking stability and the coefficient of rotation mass), the paper has studied the impacts to buses performance when the bus electromagnetic brakes were applied, established mathematical model using the MATLAB/Simulink, deduced the braking torque formulation of the former-wheel and the rear-wheel, and analyzed the impacts to vehicular braking direction stability, the brake force distribution coefficient and synchronous attachment coefficient. The simulation results have been analyzed and the formulation of rotation mass coefficient has been derived.By researching on the transient magnetic field of bus electromagnetic brake and its application performance aspects on the buses, some useful conclusions have obtained and have certain practical, theoretical reference values and better engineering applied prospects.