# Enhancing Permanent Magnet Sliding Bearings Through Multi-Layer Yoke for Minimized Magnetic Leakage

## TL;DR

This paper introduces a multi-layer yoke design to reduce magnetic leakage in permanent magnet bearings, improving safety and performance.

## Contribution

The novel contribution is a multi-layer yoke configuration that effectively minimizes magnetic leakage without compromising bearing performance.

## Key findings

- Replacing a single-layer yoke with a multi-layer yoke significantly reduces magnetic leakage.
- Optimizing the number and angular span of magnetic rings enhances leakage suppression.
- The design maintains magnetic force and load capacity while controlling magnetic leakage.

## Abstract

To mitigate the potential adverse effects of magnetic flux leakage from permanent-magnet sliding bearings on human health and the environment, this study proposes a leakage-suppressed design based on a multi-layer yoke configuration. The magnetic performance of the bearing was systematically investigated using finite element method (FEM) simulations. The results demonstrate a pronounced reduction in magnetic leakage when replacing a conventional single-layer yoke with an optimized multi-layer yoke structure. Targeted design refinements, including optimization of both the number and angular span of magnetic rings, as well as tuning of the yoke thickness, further enhance the effectiveness of the leakage-suppression strategy. The proposed multi-layer yoke configuration preserves both the magnetic force and the load-carrying capacity of the magnetic bearing, while concurrently providing a viable theoretical and engineering basis for the design and structural optimization of leakage-controlled permanent-magnet bearings.