开关磁阻电机非线性建模及转矩脉动抑制技术的研究

发布时间：2018-03-21 09:40

本文选题：开关磁阻电机　切入点：数学模型　出处：《哈尔滨理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：开关磁阻电机以其结构简单，坚固耐用、成本低廉、控制灵活，而且还具有容错能力强、耐高温和调速性能好等诸多优点，在电动汽车领域得到了广泛应用。电机频繁的通、断电所带来的转矩脉动问题一直难以解决，，所以开关磁阻电机的建模方法和转矩脉动抑制技术更多的成为了重点研究对象。本文首先介绍了开关磁阻电机在数学建模方法、转矩脉动抑制技术、功率变换器结构和控制器这几方面的国内外发展现状，简单介绍了开关磁阻电机调速系统的基本构成。然后以12/8极、功率为3kW的开关磁阻电机为研究对象，应用Ansoft Maxwell软件对开关磁阻电机做二维有限元仿真计算，仿真计算得出其磁场分布和静态磁链特性、电感特性和转矩特性，用两相通电模式下的静态转矩和一相通电下的静态转矩相对比，证明有提前开通角加入下的两相通电可以减小转矩脉动。基于实验测试的磁链数据，利用第一种磁链建模方案来得到三种特殊位置磁链函数，用得到的三种特殊位置的磁链函数结合傅里叶磁链建模方法来对电机进行数学建模，得到的模型可以精确的表示电机的磁链特性,仿真证明建模方法是可行的。通过采取固定关断角选取最优开通角来抑制转矩脉动，施加不同的开通角进行仿真对比，从仿真结果可以看出此方法是合理有效的。基于以上模型搭建实验平台，对开关磁阻电机调速系统进行了硬件的设计。结合硬件编写软件程序，合理设计了软件结构，对各个软件模块做了具体分析。用实验波形和仿真波形做对比来验证抑制转矩脉动的控制策略是正确合理的，证明了本文的建模方法和转矩脉动抑制技术是可行的。
[Abstract]:Switched reluctance motor (SRM) has been widely used in the field of electric vehicles because of its simple structure, durable structure, low cost, flexible control, strong fault tolerance, high temperature resistance and good speed regulation performance. The problem of torque ripple caused by power failure is always difficult to solve, so the modeling method and torque ripple suppression technology of switched reluctance motor (SRM) have become more and more important research object. This paper first introduces the development of switched reluctance motor in mathematical modeling, torque ripple suppression technology, power converter structure and controller. The basic structure of switched reluctance motor (SRM) speed regulation system is introduced briefly. Then, the switched reluctance motor (SRM) with 12/8 pole and 3kW power is used as the research object, and the Ansoft Maxwell software is used to simulate the SRM by two-dimensional finite element method. The magnetic field distribution and static flux characteristics, inductance characteristics and torque characteristics are obtained by simulation. The static torque under two-phase electrification mode and the static torque under one-phase electrification mode are compared. It is proved that the torque ripple can be reduced by the two-phase electrification with the addition of the opening angle in advance. Based on the flux data of the experiment, three special position flux functions are obtained by using the first flux modeling scheme. The three special position flux function and Fourier flux modeling method are used to model the motor. The obtained model can accurately express the flux characteristics of the motor. The simulation results show that the modeling method is feasible. The torque ripple is suppressed by selecting the optimal turn-on angle with fixed turn-off angle, and different turn-on angles are applied for simulation and comparison. The simulation results show that this method is reasonable and effective. Based on the above model, the hardware design of switched reluctance motor speed regulation system is carried out. By comparing the experimental waveform with the simulation waveform, the control strategy of torque ripple suppression is correct and reasonable, which proves that the modeling method and the torque ripple suppression technique are feasible in this paper.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM352

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