Affiliations: [a] School of Mechanical Engineering, Shenyang University of Technology, Shenyang, Liaoning, China | [b] School of Mechanical Engineering and Automation, Northeastern University, Shenyang, Liaoning, China | [c] Department of Mechanical Engineering, Nippon Institute of Technology, Saitama, Japan
Correspondence:
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Corresponding author: Feng Sun, School of Mechanical Engineering, Shenyang University of Technology, No. 111, Shenliao West Road, Economic and Technological Development Zone, Shenyang 110870, Liaoning, China. Tel.: +86 189 0404 0100; E-mail:sunfeng@sut.edu.cn
Abstract: A three-degree of freedom (DOF) same-stiffness permanent
magnetic spring is proposed, which comprises three groups of permanent
annular and cylindrical magnets. The three groups of magnets are
symmetrically arranged on a concentric circle. In each group, the permanent
cylindrical and annular magnets are coaxial and the same magnetic poles are
opposite. The repulsive force in the radial direction is regarded as the
magnetic spring force between the permanent cylindrical and annular magnets.
The repulsive forces of three groups of magnets can realize the three DOF
same-stiffness magnetic spring forces on a plane. In this paper, a
mathematical model of the magnetic spring force is established for one group
of magnets. The mechanical characteristics of the magnetic spring force are
analyzed by calculations with the mathematical model, simulations with the
FEM (finite-element method) model, and verifications with the experimental
prototype. The results suggest that the force characteristics of the
magnetic spring resemble those of a mechanical spring and the different
stiffness of the magnetic spring force can be obtained by changing the
structural parameters.
Keywords: Stiffness, magnetic spring, permanent magnet, finite-element method
