【作者】 李子林；

【导师】 徐华中；

【作者基本信息】 武汉理工大学 ， 控制科学与工程， 2010， 硕士

【摘要】 永磁同步电机由于其功率密度大,效率高的特点被广泛应用于工业控制的各个领域。为了达到控制精度高、调速范围宽、输出转矩大、运行稳定、抗干扰能力强等要求,先进可靠的控制系统必不可少,因此永磁同步电机调速系统的策略研究成为该领域的一个热点问题。在实际系统中,当永磁同步电动机的转速提升到一定程度时,由于供电电压的限制和电流控制器的饱和作用,要想继续提高转速相当困难。这时为了得到更宽的调速范围,就必须降低磁通大小,从而采用弱磁控制。而永磁电机转子采用永磁体励磁,其磁通大小不可调节,一般的方法就是通过改变定子电流矢量来达到等效的削弱磁通的作用,弱磁控制研究都是围绕改变定子电流大小来实现的。当电动机高速运转时,电枢反应将会非常严重,它将改变电机本身的各项参数值,从而导致电机的运转性能发生变化。而永磁同步电机的弱磁控制正是通过电枢反应实现的,其引起的参数变化影响不可避免,为了达到理想的运行效果,就必须对定子电流值进行一定的补偿,针对此,本文提出了基于定子电流补偿理论的弱磁控制方法。本文首先介绍了永磁同步电动机调速系统的基本知识和国内外在该领域的研究成果,分析了矢量控制技术的一般原理和电动机全速度范围内定子电流控制的最佳方法。然后针对电枢反应对电动机弱磁性能的影响,提出了一种基于定子电流补偿理论的弱磁控制策略,并把模糊控制理论应用在该补偿理论中,设计了模糊补偿控制器。最后通过系统软,硬件实验平台的搭建和实验数据的分析,验证了该控制策略的可行性和有效性。文章的最后对系统需要改进的地方和下一步的研究工作进行了展望。更多还原

【Abstract】 Permanent Magnet Synchronous Motor (PMSM) has been widely used in industrial control areas for its high efficiency density and energy conversion efficiency. In order to achieve high performance such as high control precision, wide speed extension and strong suitability to environment, it is essential to apply the advanced control system on the motor. Therefore, the research of the PMSM speed control system attracted much attention.In practice, as the reason of the limitation of the supply voltage and the saturation of the current regulator, the performance declines when the speed of PMSM rises upon the basis value, and the application of PMSM is restricted, in this case, the flux-weakening control theory is used in the industrial application. For the rotor of PMSM is composed of the permanent magnets, the constant magnetic field strength can’t be changed. In general, when the motor enters the flux-weakening region, the stator current vector is changed to reduce the magnetism.However, the armature reaction is severe along with the increase of the speed, it will result the variation of the parameters of the motor and the control performance decrease finally. In order to reach the ideal control performance, the stator current compensation theory is applied to reduce the influences from the parameters variation.A Fuzzy Controller for the compensation of the Direct-axis current component in the flux-weakening control system of PMSM is proposed in this paper. The control method is implemented in the experimental platform based on TI DSP chip, the experiment results demonstrate that the Fuzzy control rules and parameters adopted in this paper can improve the performance of torque effectively. Finally, a summary of the full text and the suggestion of the future work are provided.更多还原