【作者】 熊春雷；

【导师】 陈世元；

【作者基本信息】 华南理工大学 ， 电机与电器， 2010， 硕士

【摘要】 本文以12/8极车用外转子永磁双凸极轮毂电机作为对象进行研究和控制。在查阅相关文献的基础上,了解汽车电动机的发展状况。对比各种汽车电机的特点,并进一步研究双凸极电机的性能和其控制方法的实现。首先设计出25kw双凸极永磁电机的结构尺寸,然后对该电机进行有限元分析和电磁计算,得到不同位置的电机磁场分布图和气隙磁密分布状况,获得该电机的磁链和电感的静态特性。在此基础上,对此电机的数学模型和运行原理进行了分析,并设计出该电机各相绕组的导通时序,并对该电机控制的方法进行了研究。本文分析PID控制器各控制项对系统稳定性的影响,总结出PID控制的优点和缺点。因为双凸极永磁电机有较好的动态调速性能,本文采用了转速和电流双闭环的PI控制。在MATLAB/ Simulink平台下搭建电机的本体和控制系统的各功能模块,并进行控制系统仿真和分析。由于PI控制过程中PI参数固定,电机转速波动和转矩脉动都比较大。针对这个问题,采用速度环模糊PI自整定控制方法。搭建了以转速误差e和误差变化率ec作为输入,PI控制器的参数Kp和Ki的增量为输出的模糊控制器模型,对PI参数进行在线自整定,结合控制模块对整个控制系统进行仿真,并对两种方法的仿真结果进行对比和分析。最后,针对轮毂电机驱动汽车存在的差速问题,设计了基于BP神经网络的电子差速器的方案,此方案中对汽车驱动电机控制采用对速度环PI自整定模糊控制,并搭建了整个系统模型进行了仿真分析。更多还原

【Abstract】 In this paper, the doubly salient permanent magnet wheel- hub motor is the research object. Firstly, based on reading lots of thesis on this domain, many analysis and comparisons between different kinds of electric vehicle with various characteristics have been done. A common sense about the development of motor vehicles is bulit. And the development of the applicaion of the doubly salient permanent magnet motor and the its control and implement method also have obtained.By analysing the structure of this motor and calculating the electromagnetic with the finite element analysis method, Magnetic plot and flux density plot of air gap under the diverse positons could be obtained, depending on these informations, the mathematical model and basic working principle of this motor has been designed, and the steady state characteristic of flux and induction. Following, the math expression and working status of the motor would be studied, and breakover order of each winding in the moter should be designed. Then a driving method is analysed.Because doubly salient permanent magnet motor has a good dynamic speed regulation ability.Ⅰuse double closed loop method which inclue speed loop and circuit loop to control the motor. Firstly, the impact exerted by the PID controllor to the stability of system should be ayalysed, and based on these, the advantages and disadvantages of the PID could be acquired.By the Matlab/Simulink, a model include the moter and its controllor could be built.By the simulation, the speed and the torque is not good enough, because the PI parameters during the PI control process are fixed. Depending on the fuzzy principle, we use the fuzzy PI self-adaptive control. Firstly, the error of the speed and the slope of the error are used as the inputs. The increament of paramters Kp and Ki are work as a controllor which regulate the parameters. All these have been complished in the Simulink.The results of the simulation are compared and analysed.At last, according to the differential problem of the electric vehicle,Electronic differential proposal is designed base on BP neural network and Analyze simulation results.更多还原