Study On Electromechanical Coupling Characteristics Of Independent Wheelset Bogie Controlled By Traction Motor

Modern trolley travelling because of its convenient,comfortable and healthy and green environmental protection advantages are popular all over the world people,most of the bogie with independent rotating wheels,independently rotating wheels are oriented ability to neutralize some problems automatically,based on the practical engineering problems,this paper will adopt a longitudinal coupling boundary displacement motor independent wheel bogie,The dynamic characteristics and electromechanical coupling characteristics of the vehicle are studied.In this paper,the longitudinal creep forces of different coupling forms of wheelset bogies are compared and analyzed.It can be obtained that the traditional wheelset can produce the longitudinal creep forces of the same wheel size and opposite direction,and the steering ability is the best.Under the curve condition,the longitudinal creep force of the independently rotating wheel is very small,so it can only rely on the flange to guide when passing through the curve.Longitudinally coupled independent wheelset can also produce longitudinal creep force,which is different from the traditional wheelset.The longitudinal creep force of the front and rear wheels on the same side is the same,but the direction is opposite,so the wheelset has the ability of automatic alignment and curve steering,which is better than that of the independent rotating wheel.Because the left and right wheels of the elastic damping coupling wheelset are not completely consolidated,longitudinal creep force can also be generated in the actual circuit,and its law is basically the same as that of the traditional wheelset.Its guiding performance is slightly worse than that of the traditional wheelset,which is better than that of the longitudinal coupling wheelset.The longitudinal coupled side drive motor bogie is a complex mechanical and electrical coupling nonlinear system.Through simulation,it is found that the dynamic characteristics of the longitudinal coupled side drive motor bogie are consistent with the elastic damping coupling wheel set with coupling stiffness of 200N·m/rad and coupling damping of 10~5 N·m·s/rad.Compared with the independently rotating wheel,the wheel-rail lateral force,derailment coefficient,impact Angle and wheel weight reduction rate are reduced by 14%,12%,34%and 29%respectively.In order to further verify this rule,the vehicle passes through different curve sections at different speeds under the track irregularity,and the mechanism and electromechanical coupling of independent wheelset track are compared and analyzed.The calculation results show that the longitudinal coupling wheel and the elastic damping coupling wheel have the best anti-orbital disturbance ability,while the independent wheel has the worst anti-orbital disturbance ability.Under different curve radii,the dynamic performance of longitudinal coupling wheelset is similar to that of elastic damping wheelset,and it has better curve passing performance.Compared with the traditional wheelset,its dynamic performance is better than that of the traditional wheelset when the curve radius is 300 m<R<500 m.