永磁同步电机弱磁控制方法研究

发布时间：2018-01-24 13:12

本文关键词： 永磁同步电机 SVPWM调制弱磁控制电压反馈 Matlab/Simulink仿真　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来，随着高性能永磁材料的深入研究和使用，以及电力电子器件性能指数的不断改善，高性能永磁同步伺服系统得到了迅速的发展。然而，当将其应用在诸如电动车、机场大厅多人运输车、叉车、机床主轴驱动等场合时，对于整个系统提出了更高的性能要求，不仅要求在低速时输出较大的转矩，还希望稳定运行时获得更高的运行速度。而常规矢量控制方法已经无法使电机运行在额定转速以上，因此，拓宽电机的调速范围成为电机控制方面亟须解决的问题。永磁同步电机的弱磁控制能够使电机运行于基速以上，拓宽电机的调速范围，进而永磁同步调速系统弱磁控制成为现今电机领域的一个研究热点。本文首先就永磁同步电机弱磁控制的国内外发展现状和未来发展趋势进行了简单介绍，建立了永磁同步电机在旋转坐标系下的动态模型，介绍了常用的矢量控制策略，，并通过控制效果对比引出永磁同步电机弱磁控制方法。然后，详细介绍了永磁同步电机的弱磁控制原理，并对弱磁控制的约束条件、弱磁控制区间的电流给定及现有弱磁控制策略做了简单的介绍，推导了电机在恒转矩控制和弱磁控制阶段中永磁同步电机电流矢量在电流平面的运行轨迹及其相关说明。深入研究了基于电压反馈的永磁同步电机弱磁控制算法。最后，基于电压反馈弱磁算法对控制系统建模，构建了以SVPWM为调制算法，基于电压反馈的永磁同步电机弱磁控制系统框图，对框图中的关键模块进行了分析和设计，并借助Matlab/Simulink软件对控制系统进行了建模和仿真，仿真结果验证了基于电压反馈的弱磁控制方法的可行性和有效性。并由仿真结果分析指出基于电压反馈弱磁控制策略的不足点，从而为该弱磁控制策略的进一步完善提出新的思路。
[Abstract]:In recent years, with the deep research and application of high performance permanent magnet materials and the continuous improvement of power electronic device performance index, the high performance permanent magnet synchronous servo system has been developed rapidly. When it is applied to such occasions as electric vehicles, multi-person transport vehicles in airport halls, forklifts, machine tool spindle drive and so on, it puts forward higher performance requirements for the whole system, not only requires a large torque output at low speed. The conventional vector control method can not make the motor run above rated speed. Widening the speed range of the motor becomes an urgent problem in motor control. The weak magnetic field control of the permanent magnet synchronous motor can make the motor run above the basic speed and widen the speed range of the motor. Furthermore, permanent magnet synchronous speed control system has become a research hotspot in the field of motor. In this paper, the current situation and future development trend of PMSM weak magnetic control are introduced briefly, and the dynamic model of PMSM in rotating coordinate system is established. The common vector control strategy is introduced, and the control method of permanent magnet synchronous motor (PMSM) is introduced by comparing the control results. Then, the principle of the weak magnetic field control of the permanent magnet synchronous motor is introduced in detail, and the constraint conditions of the weak magnetic field control, the current given in the weak magnetic field control section and the existing weak magnetic field control strategy are simply introduced. In this paper, the current vector of permanent magnet synchronous motor (PMSM) in the phase of constant torque control and weak magnetic field control is deduced and its related explanation is given. The weak magnetic control algorithm of PMSM based on voltage feedback is deeply studied. . Finally, the control system is modeled based on voltage feedback weakening algorithm, and the block diagram of permanent magnet synchronous motor weak magnetic field control system based on voltage feedback is constructed based on SVPWM modulation algorithm. The key modules in the block diagram are analyzed and designed, and the control system is modeled and simulated with the help of Matlab/Simulink software. The simulation results verify the feasibility and effectiveness of the weak magnetic field control method based on voltage feedback, and point out the shortcomings of the weak magnetic field control strategy based on voltage feedback through the analysis of simulation results. Therefore, a new idea is put forward for the further improvement of the weak magnetic field control strategy.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM341

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