• CN:11-2187/TH
  • ISSN:0577-6686

›› 2002, Vol. 38 ›› Issue (10): 122-126.

• 论文 • 上一篇    下一篇

磁轴承磨床电主轴全局线性化研究

李新生;杨作兴;赵雷;赵鸿宾   

  1. 清华大学工程物理系
  • 发布日期:2002-10-15

STUDY ON GLOBAL LINEARIZATION FOR GRINDING SPINDLE WITH ACTIVE MAGNETIC BEARINGS

Li Xinsheng;Yang Zuoxing;Zhao Lei Zhao Hongbin   

  1. Tsinghua University
  • Published:2002-10-15

摘要: 由于电磁力与电流和位移关系的非线性,当主轴工作点改变时,建立在局部线性化基础之上的主动磁轴承(AMB)系统的性能会产生很大的变化。AMB用于磨削主轴,特别是用于非圆工件的磨削加工,要求具有不随工作点改变的刚度性能和位移跟踪性能。在理论上给出了AMB系统工作点改变对系统性能的影响,并通过试验得到了验证。考虑到线性补偿方法的简单性,采用了线性补偿方法进行AMB系统的全局线性化。针对功率损耗和动态性能,比较了3种线性补偿方法:最小磁通(MIF)、磁通和不变(CFS)及磁通积不变(CFP),结果表明,MIF具有最小的功率损耗,而CFS具有最好的动态性能。测量了建立在全局线性化基础上的AMB系统的性能,结果表明,工作点改变时,AMB系统的性能几乎不随之而改变。

关键词: 磁轴承, 非线性, 线性化, 主轴

Abstract: Due to the nonlinear relationship between force and current/displacement, the performance of active magnetic bearings (AMB) system based on local linearization varies greatly as the operating point of the spindle changes. The same stiffness and the same displacement tracking performance are demanded for grinding spindle with AMB especially when noncircular workpieces need grinding. The influence of changing operating point on performance is presented theoretically and proved with experiments. Linear compensation is adopted to realize global linearization because of its simplify. Three linear compensation methods: minimum flux (MIF), constant flux sum (CFS), constant flux product (CFP) are compared in terms of power loss and dynamic performance. The result shows that the power loss of MIF is least and CFS behaves best dynamic performance. The performance of AMB system based on global linearization is measured and almost the same result is obtained despite the change of operating point.

Key words: Magnetic bearings(MB), Nonlinear Linearization, Spindle

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