四凸极液冷电磁缓速器数值模拟与实验研究

Numerical Simulation and Experimental Study of Four Salient Poles Liquid-Cooled Electromagnetic Retarder

为解决中重型车辆长下坡时因主制动器频繁工作导致其制动效能严重衰退问题,提出一种四凸极液冷电磁缓速器结构。建立车辆下坡动力学模型分析制动需求,采用等效磁路法对其制动力矩进行计算,使用有限元法对其制动特性进行数值分析。利用分级变论域模糊控制策略结合缓速器进行车辆下坡时的制动控制,使用MATLAB/Simulink建立控制器和整车长下坡制动模型并进行联合仿真。设计了2100 N·m样机,通过台架实验和车载道路实验对样机制动特性进行测试,实际测量值与分析计算值基本一致,平均误差在5%内,在转速为1250 r/min时制动力矩可达2200 N·m,满足中重型车辆制动需求。

To solve the problem of significant degradation in braking efficiency of medium and heavy-duty vehicles during prolonged downhill descents due to frequent engagement of the main brake system,a four salient poles liquid-cooled electromagnetic retarder structure is proposed in this paper.A vehicle downhill dynamics model is established to analyze the braking demand,using the magnetic equivalent circuit method to calculate its braking torque,and using the finite element method to numerically analyze its braking characteristics.The hierarchical variable domain fuzzy control strategy combined with a retarder is used for vehicle downhill braking control,and the controller and overall vehicle downhill braking model are established using MATLAB/Simulink for joint simulation.A 2100 N·m prototype is designed.The braking characteristics of the prototype are tested through bench test and on-road vehicle tests.The results show that the actual measured value and the calculated value is basically consistent,with an average error within 5%,with the braking torque reaching 2200 N·m when the speed is 1250 r/min,which can meet the needs of medium and heavy duty vehicle braking.