Theoretical Computational Model for Cylindrical Permanent Magnet Coupling

Ke Sun,Guoying Meng,Jianwen Shi,Wei Cui

doi:10.3390/electronics10162026

Ke Sun, Guoying Meng + Show 2 more

Open Access

https://doi.org/10.3390/electronics10162026

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Abstract

Permanent magnet coupling is extensively studied owing to its economic efficiency and stability. In this study, a computational model for cylindrical permanent magnet coupling (CPMC) was designed using the magnetic field division method to divide an air gap magnetic field. An equivalent magnetic circuit model was also designed based on the equivalent magnetic circuit method. The novelty of this study is that both the skin effect and the working point of the permanent magnet are taken into consideration to obtain the magnetic circuit and induce eddy current characteristics of permanent magnet coupling. Furthermore, a computational model was obtained for the transmission torque of the CPMC based on the principles of Faraday’s and Ampere’s laws. Additionally, the accuracy of the model was verified using a finite element simulation model and a test bench.

Highlights

Permanent magnet coupling is based on magnetic fields
The calculation model proposed in this article, when compared to the experimental values, has maximum errors of 2.3%, 2.5%, 3.6%, and 8.7% under engagement lengths of 80 mm, 60 mm, 40 mm, and 20 mm, respectively
(1) In accordance with the basic laws of magnetic circuits, this study used the magnetic field division method to divide the magnetic circuit of a cylindrical permanent magnet coupling (CPMC) into multiple magnetic flux tubes

Summary

Introduction

Permanent magnet coupling is based on magnetic fields. It utilizes the non-contact relative motion between a permanent magnet and a conductor to induce an eddy current that, in turn, generates an induced magnetic field. The finite element method (FEM) [1,2,3,4] accurately describes the electric and magnetic field distributions inside devices. An analytical model is less accurate than the FEM, but the associated calculation is simple, and the model parameters can be modified; it simplifies the device design, model selection, and maintenance processes

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