Magnetic Circuit Design and Magnetic Field Finite Element Analysis of Converging Stepped Magnetofluid Seal with Small Clearance

Xiaolong Yang,Ruibo Zhang,Guohong Wang

doi:10.1155/2020/4201891

Xiaolong Yang, Ruibo Zhang + Show 1 more

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https://doi.org/10.1155/2020/4201891

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Abstract

The stepped magnetofluid seal is an effective method for improving the pressure ability of ordinary magnetofluid seals (OMS) with large clearance. At present, the research on stepped magnetofluid seal with less than 0.4 mm small clearance has not been carried out yet. The equivalent magnetic circuit design of converging stepped magnetofluid seal (CSMS) with small clearance has been carried out and verified by magnetic field finite element method based on the CSMS theory and magnetic circuit theory. The effects of the width of the axial seal position, the height of the radial seal position, the number of the pole tooth in the axial seal position, and the number of the pole tooth in the radial seal position on the theoretical pressure ability of the CSMS are investigated by numerical simulation. The calculation results are analyzed and discussed. The results show that the magnetic flux leakage at the junction of the permanent magnet and pole piece causes the higher pressure ability of the CSMS structure designed by the equivalent magnetic circuit method than that calculated by the magnetic field finite element method. When the width of the axial seal position is greater than the height of the radial seal position and the number of pole teeth in the axial seal position is less than the number of pole teeth in the radial seal position, the CSMS has the best effect. Compared with OMS with small clearance, CSMS has greater advantages.

Highlights

Magnetofluid is a kind of advanced intelligent material, which has become the research object of many researchers because of its stable and special properties [1]
Lots of research studies focus on ordinary magnetofluid seals (OMS) with less than 0.4 mm small clearance
E magnetic field generated by the permanent magnet limits the magnetofluid to the seal position, and the magnetic field force acting on the magnetofluid is used to resist the pressure difference between two ends of the structure, so as to achieve the purpose of blocking the leakage channel

Summary

Introduction

Magnetofluid is a kind of advanced intelligent material, which has become the research object of many researchers because of its stable and special properties [1]. Magnetofluid seals technique is a new kind of sealing method. In contrast to ordinary sealing, magnetofluid sealing has many strength points such as no wear, no leakage, no contamination, and lasting service life [2]. Erefore, magnetofluid seals are widely used in dynamic seals, isolation seal, and environmental seal [3,4,5]. Urreta and Mkubik et al analyzed the sealing effect of two kinds of magnetofluid with different particle sizes to improve the pressure ability and to reduce friction torque and apply them to the spindle of high-precision machine tool [6, 7].

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