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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2020, Vol. 41 ›› Issue (5): 423358-423358.doi: 10.7527/S1000-6893.2019.23358

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

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)

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

CLC Number: