Affiliations: [a] School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China | [b] Hubei Maglev Engineering Technology Research Center, Wuhan University of Technology, Wuhan, China
Correspondence:
[*]
Corresponding author: Changhao Chen, School of Mechanical and Electronic Engineering, Wuhan University of Technology, China. Tel.: +86 18672792932; Fax: +86 027 87859505; E-mail: cch890907@whut.edu.cn
Abstract: The International Space Station (ISS) has been regarding as a laboratory for experiments in numerous microgravity science discipline. However, the microvibration has a serious impact on science experiments on the ISS as well as existing electromagnetic actuators could not satisfy the requirement of good linearity needed for large stroke of low frequency vibration isolation platforms. This paper aims to design a maglev actuator with good linearity, which could be applied to microgravity vibration isolation platforms. Based on the principle of Lorentz force and self-demagnetization effect, the structural form and preliminary design indices of the actuator were presented. In order to minimize the weight and heat consumption of its coil, parametric design was carried out and multi-objective optimization was adopted for it. Moreover, to investigate the dynamic characteristics of the actuator, system identification was performed to obtain a mathematical model of its control channel, which has good fitting degree of the time and frequency domain signals. Therefore, the result provides an important basis for structural optimal design of the actuator for microgravity vibration isolation system.
Keywords: Maglev actuator, multi-objective optimization, dynamic characteristic, system identification, mathematical model
