电动汽车轴向轮毂电机的工作特性

本文针对轴向永磁轮毂电机变负载调速时的传动性能,分析了启动过程中的转矩和转速等启动性能以及启动完成后的磁密、涡流损耗、传动效率等工作性能。首先运用矢量磁位法建立了数学模型,得到气隙磁密、转矩、轴向力和传动效率等工作参数的数学表达式,并运用Matlab软件进行了系统气隙磁密的数值计算;然后利用Magnet软件模拟得到了不同输入转速和不同变负载系数下启动过程的转矩和转速的变化规律,接着分析启动完成后稳定运行时的磁密、涡流损耗和传动效率;最后搭建模拟的轴向磁通轮毂电机实验平台,测量得到了不同输入转速下的转速、转矩和传动效率,验证了理论分析和模拟的正确性。本文研究成果有利于轴向永磁磁通轮毂电机传动性能的研究,对提高轮毂电机工作效率的提高具有重要意义。

Working Characteristics of Axial Hub Motors for Electric Vehicles

Aiming at the transmission performance of the axial permanent magnet hub motor during variable load speed regulation,this paper analyzes the starting performance such as torque and speed during the starting process,as well as the working performance such as magnetic density,eddy current loss and transmission effi ciency after starting.Firstly,a mathematical model was established using the vector magnetic potential method to obtain the mathematical expressions of working parameters such as air gap fl ux density,torque,axial force and transmission effi ciency,and the numerical calculation of the system air gap fl ux density was carried out using Matlab software.Using magnet software to simulate the torque and speed changes during the start-up process under diff erent input speeds and diff erent variable load factors,the article then analyzes the magnetic density,and the eddy current loss and transmission effi ciency during stable operation after the start-up is completed.Finally the research builds the simulated axial.The fl ux hub motor experimental platform has measured the speed,torque and transmission effi ciency at diff erent input speeds,which verifi es the correctness of the theoretical analysis and simulation.The research results of this paper are conducive to the research on the transmission performance of axial permanent magnetic fl ux in-wheel motors,and are of great signifi cance to improving the effi ciency of the in-wheel motors.