直线电机电磁场分析及推力波动的改善

发布时间：2018-04-15 18:17

本文选题：永磁直线同步电机 + 电磁场解析　；参考：《电子科技大学》2014年硕士论文

【摘要】：当前,随着各种新型控制策略的深入发展及电力电子技术与各种高性能材料的研制,传统电机所带来的收益已无法满足市场要求,而直线电机却蕴藏着巨大的应用潜力,在IC制芯、数控系统以及封装设备等领域都有着不错的发挥,并逐步成为高档数控机床的主要功能部件,是实现“高精、高速”要求的必要途径之一。然而影响直线电机应用前景的重要原因之一是由各种内部外部因素(摩擦扰动、系统参数摄动等)所催生的推力波动,这会对直线电机的运行性能(定位精度、低速时的平稳性等)造成重大影响。本文将以普什宁江机床股份有限公司高速高精卧式加工中心直驱技术实验平台的直线电机为研究对象,以削弱推力波动对永磁直线同步电机性能的影响为核心问题,针对推力波动产生因素及伺服控制系统进行了深入研究,提出直线电机结构改进措施及推力波动的控制策略补偿方案。本文首先对直线电机的发展状况及各方面研究进展进行剖析,并在介绍本文研究的永磁直线同步电机(PMLSM)构造特征及运作机理的基础上,运用镜像法建立电机的物理模型并进行求解,从而得到永磁直线同步电机的磁场分布。同时对直线电机的电磁场进行瞬态分析,详细讨论永磁直线同步电机的瞬态磁场分布,并对所引入方法的精确性进行验证。然后在PMLSM电磁场分析的基础之上对推力波动及引起推力波动的主要原因磁阻力进行深入研究,结合相应的边界条件,建立有限元分析模型,并提出改善推力波动的结构改进措施。通过仿真验证解析分析结果的正确性以及所提出的结构改进措施的有效性。最后,提出一种改进的无速度传感器直接推力控制系统,用两个PI控制器代替传统的磁滞控制器对推力及定子磁通进行控制:该系统将推力及定子磁通进行解耦,在静磁通坐标系下用两个独立控制环分别进行控制。再经过仿真验证结果的鲁棒性以及对推力波动的抑制与削弱效果。
[Abstract]:At present, with the further development of various new control strategies and the development of power electronics technology and various high-performance materials, the benefits brought by the traditional motor can no longer meet the market requirements, but the linear motor has great application potential.In the field of IC core-making, NC system and packaging equipment, it has become the main functional part of high-grade NC machine tool, and is one of the necessary ways to realize the requirement of "high precision and high speed".However, one of the important reasons that affect the application prospect of linear motor is the thrust fluctuation caused by various internal and external factors (friction disturbance, system parameter perturbation, etc.), which will affect the performance (positioning accuracy) of linear motor.The smoothness at low speed, etc.) causes a major impact.In this paper, the linear motor of the experimental platform of high speed and high precision horizontal machining center of Pushinjiang Machine tool Co., Ltd. is taken as the research object, and the core problem is to weaken the influence of thrust fluctuation on the performance of permanent magnet linear synchronous motor (PMLSM).The factors of thrust fluctuation and servo control system are studied deeply, and the improvement measures of linear motor structure and the compensation scheme of thrust fluctuation control strategy are put forward.In this paper, firstly, the development of linear motor and its research progress are analyzed, and on the basis of introducing the structure and operation mechanism of PMLSM studied in this paper,The physical model of permanent magnet linear synchronous motor (PMLSM) is established and solved by mirror image method, and the magnetic field distribution of PMLSM is obtained.At the same time, the transient magnetic field distribution of permanent magnet linear synchronous motor is discussed in detail, and the accuracy of the proposed method is verified.Then, based on the analysis of PMLSM electromagnetic field, the magnetic resistance of thrust fluctuation and the main cause of thrust fluctuation are studied in depth, and the finite element analysis model is established combining with the corresponding boundary conditions.The structure improvement measures to improve thrust fluctuation are put forward.The correctness of the analytical results and the effectiveness of the proposed structural improvement measures are verified by simulation.Finally, an improved speed sensorless direct thrust control system is proposed, in which two Pi controllers are used instead of the traditional hysteresis controllers to control the thrust and stator flux. The system decouples the thrust and stator flux.Two independent control loops are used to control the magnetostatic flux coordinate system.The robustness of the simulation results and the effectiveness of restraining and weakening the thrust fluctuation are verified by simulation.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM359.4

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