混合式永磁同步电机弱磁控制系统研究

发布时间：2018-04-05 17:47

本文选题：混合式永磁同步电机　切入点：MC56F82748　出处：《浙江大学》2017年硕士论文

【摘要】：永磁同步电机具有高效、高功率因数、高可靠性的优点,也存在弱磁困难的不足,长期以来,改善永磁电机的弱磁性能,拓宽调速范围一直是永磁电机的研究热点。混合式永磁电机的转子磁系统由轴向充磁的永磁体环片和夹在永磁体环片二端的铁芯组成,电机气隙小,永磁体的励磁磁势小,电枢磁场主磁路的磁阻小,因此去磁效果明显。论文以性能优良、弱磁能力好的三相混合式永磁电动机为研究对象,设计了一个基于MC56F82748芯片的弱磁控制系统,在此基础上对混合式永磁同步电机弱磁性能进行了深入研究。首先,本文介绍了永磁同步电机及其控制理论的发展现状,介绍了常用的矢量控制方法和提升弱磁性能的方法,并进行了分析对比,选定了本系统的控制方法。其次,介绍了混合式永磁同步电机的结构特点,建立了数学模型,定性分析了混合式永磁同步电机的弱磁性能;在MATLAB/Simulink中建立了混合式永磁同步电机矢量控制系统仿真模型并进行了仿真研究。最后,设计了基于MC56F82748芯片的混合式永磁同步电机控制系统,实现了基于i_d=0的转速、电流双闭环矢量控制,实现了基于附加电压反馈法的弱磁控制,实现了混合式永磁同步电机的4倍弱磁扩速。
[Abstract]:Permanent magnet synchronous motor (PMSM) has the advantages of high efficiency, high power factor and high reliability, but also has the disadvantage of weak magnetic field. For a long time, improving the weak magnetic performance of PMSM and widening the speed range has been the research hotspot of PMSM.The rotor magnetic system of hybrid permanent magnet motor is composed of an axial magnetized permanent magnet ring and an iron core clamped at the two ends of the permanent magnet ring. The air gap of the motor is small, the excitation magnetic potential of the permanent magnet is small, and the magnetoresistance of the main magnetic circuit of the armature magnetic field is small, so the demagnetization effect is obvious.In this paper, a weak magnetic field control system based on MC56F82748 chip is designed for the three-phase hybrid permanent magnet motor with excellent performance and good magnetic weakening ability. On this basis, the weak magnetic performance of the hybrid permanent magnet synchronous motor is deeply studied.Firstly, this paper introduces the development of PMSM and its control theory, introduces the common vector control methods and the methods to improve the weak magnetic performance, and analyzes and compares the control methods of the system.Secondly, the structure characteristics of hybrid permanent magnet synchronous motor are introduced, the mathematical model is established, and the weak magnetic performance of hybrid permanent magnet synchronous motor is analyzed qualitatively.The simulation model of hybrid permanent magnet synchronous motor (PMSM) vector control system is established in MATLAB/Simulink.Finally, a hybrid permanent magnet synchronous motor control system based on MC56F82748 chip is designed, which realizes the speed and current double closed loop vector control based on i_d=0, and the weak magnetic field control based on the additional voltage feedback method.The four times weak magnetic expansion speed of hybrid permanent magnet synchronous motor is realized.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM341;TP273

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