Magneto-Electric-Liquid-Thermal Coupling Characteristics of Permanent Magnet-Driven Liquid Metal

LEI Xianliang; GUO Wencang; LI Zhining

doi:10.7652/xjtuxb202503007

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Magneto-Electric-Liquid-Thermal Coupling Characteristics of Permanent Magnet-Driven Liquid Metal

更新时间：2026-01-06

- Magneto-Electric-Liquid-Thermal Coupling Characteristics of Permanent Magnet-Driven Liquid Metal
- Journal of Xi’an Jiaotong University Vol. 59, Issue 3, Pages: 67-76(2025)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室， 710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202503007
  CLC： TK124
- Received：28 June 2024，
  
  Online First：21 October 2024，
  
  Published：10 March 2025
- 稿件说明：
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LEI Xianliang, GUO Wencang, LI Zhining. Magneto-Electric-Liquid-Thermal Coupling Characteristics of Permanent Magnet-Driven Liquid Metal[J]. Journal of Xi’an Jiaotong University, 2025, 59(3): 67-76.
DOI：

LEI Xianliang, GUO Wencang, LI Zhining. Magneto-Electric-Liquid-Thermal Coupling Characteristics of Permanent Magnet-Driven Liquid Metal[J]. Journal of Xi’an Jiaotong University, 2025, 59(3): 67-76. DOI： 10.7652/xjtuxb202503007.

摘要

针对可靠、低成本的液态金属驱动方法仍十分缺乏的现状，利用旋转永磁本身磁场与导电流体中产生的错位感应磁场间的洛伦兹力来驱动液态金属，提出了磁-电-流-热的多物理场耦合计算的有限元仿真方法，构建了U型通道耦合分析模型，研究了气隙间距、磁体数量、剩余磁通密度、磁盘转速等参数对U型液态金属流道内磁场、感应电流、流动与传热的影响规律。仿真结果表明：气隙间距由6 mm增加至14 mm时，轴向扭矩显著衰减7.5倍；永磁体数量由4块增长2倍时，扭矩由波动达到稳定，由于周向单磁体作用于液态金属时间减小，感应电流峰值降低2.5倍，平均轴向扭矩降低5.2倍；高剩余磁通密度条件下输出扭矩非线性增加，2.0 T时产生的扭矩是1.0 T时的4.67倍；当磁盘转速由200 r/min增加至800 r/min时，产生的扭矩可提升2.52倍。该研究结果可为开发高效、稳定的永磁驱动装置提供参考。

Abstract

In response to the current scarcity of reliable and cost-effective liquid metal driving methods

a finite element simulation method for the multi-physics field coupling calculation of magneto-electric-liquid-thermal coupling is proposed. The approach leverages the Lorentz force between the magnetic field of the rotating permanent magnet and the induced magnetic field in the conductive fluid to propel the liquid metal. A coupled analysis model of the U-shaped channel is constructed to investigate the effects of parameters

such as gap distance

number of magnets

residual magnetic flux density

and disk rotation speed

on the magnetic field

induced currents

flow

and heat transfer within the U-shaped liquid metal channel. Simulation results show that when the gap distance increases from 6 mm to 14 mm

the axial torque significantly decreases by 7.5 times; with a doubling of the number of permanent magnets from 4 to 8

the torque stabilizes after fluctuation

and due to the reduced time of action of the circumferential single magnet on the liquid metal

the peak induced current decreases by 2.5 times and the average axial torque decreases by 5.2 times; under high residual magnetic flux density conditions

the output torque nonlinearly increases

with the torque generated at 2.0 T being 4.67 times that at 1.0 T; when the disk rotation speed increases from 200 r/min to 800 r/min

the generated torque can be increased by 2.52 times. These research findings can provide reference for the development of efficient and stable permanent magnet-driven devices.

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references

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