航空学报 > 2020, Vol. 41 Issue (5): 423358-423358   doi: 10.7527/S1000-6893.2019.23358

磁悬浮斜翼节静动态特性

孟彬, 王登, 徐豪, 刘备   

  1. 浙江工业大学 机械工程学院, 杭州 310023
  • 收稿日期:2019-08-09 修回日期:2019-08-30 出版日期:2020-05-15 发布日期:2019-11-07
  • 通讯作者: 孟彬 E-mail:bin_meng@zjut.edu.cn
  • 基金资助:
    国家自然科学基金(51975524)

Static and dynamic characteristics of magnetic suspension coupling

MENG Bin, WANG Deng, XU Hao, LIU Bei   

  1. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China
  • Received:2019-08-09 Revised:2019-08-30 Online:2020-05-15 Published:2019-11-07
  • Supported by:
    National Natural Science Foundation of China (51975524)

摘要: 作为直动式电-机械转换器和二维阀本体之间的连接桥梁,反馈放大机构起着位置反馈、运动转换和推力放大的重要作用。但现有二维伺服比例阀的机械式反馈放大机构都存在摩擦磨损等非线性环节,对阀的静态特性影响明显。基于永磁悬浮技术提出一种新型的无接触式磁悬浮斜翼节,其依靠磁斥力将斜翼动子和阀芯悬浮在中位,同时实现位置反馈和运动转换功能,以彻底去除传统机械式反馈放大机构由于接触带来的摩擦磨损等因素对阀控制特性的不利影响。首先基于电磁场理论建立了磁悬浮斜翼节的数学解析模型,讨论了关键结构参数对磁力矩的影响;随后在Maxwell和Adams平台上分别对其静动态特性进行了基于有限元模拟和多体运动学分析的参数优化,在此基础上制作了实验样机,搭建实验台架研究了斜翼节的静动态特性,从而验证了其工程实用性。仿真和实验结果基本相符,3种验证的斜翼节样机中,当外接比例电磁铁推动外动子移动3 mm时,最大磁力矩可达到0.252 N·m,阶跃响应时间约120 ms。参数化设计表明减小工作气隙和增加斜翼节倾角均能提升斜翼节的磁力矩和动态响应,而在气隙中添加磁流体可提升磁力矩,但同时影响阶跃响应。研究工作对于后续磁悬浮斜翼节在二维伺服比例阀上的实际应用具有重要的参考价值。

关键词: 磁悬浮斜翼节, 静动态特性, 有限元模拟, 二维阀, 伺服阀

Abstract: As a bridge between the direct electric-mechanical converter and the two-dimensional valve body, the feedback amplification mechanism plays an important role in position feedback, motion conversion, and thrust amplification. However, the existing mechanical feedback amplification mechanism of two-dimensional servo proportional valve has some non-linear links such as friction and wear, which have a significant impact on the static characteristics of the valve. Based on the permanent magnet suspension technology, a new type of contactless magnetic suspension coupling is proposed in this paper. It suspends the oblique wing rotor and valve core in the middle by magnetic repulsion force, and realizes position feedback and motion conversion function, eliminating the friction and wear caused by contact of traditional mechanical feedback amplifier mechanism. Firstly, based on the electromagnetic field theory, the mathematical analytical model of magnetic suspension coupling is established, and the influence of key structural parameters on magnetic moment is discussed. Then, the static and dynamic characteristics of magnetic suspension coupling are optimized based on the finite element numerical simulation and multi-body kinematics analysis on Maxwell and Adams platforms. On this basis, sample experimental flights are made. The static and dynamic characteristics of the coupling are studied by setting up an experimental bench, which verifies its engineering practicability. The results of simulation and experiment are basically in agreement. In the three validated prototypes, when the external proportional electromagnet drives the external mover to move 3 mm, the maximum magnetic moment can reach 0.252 N·m, and the step response time is about 120 ms. Parametric design shows that reducing the working air gap and increasing the inclination angle of the coupling can improve the magnetic moment and dynamic response of the coupling, while adding magnetic fluid in the air gap can improve the magnetic moment, but at the same time affect the step response. The research has important reference value for the follow-up application of magnetic suspension coupling in two-dimensional servo proportional valve.

Key words: magnetic suspension coupling, static and dynamic characteristics, FEM simulation, 2D valve, servo valve

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