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迈向具有静态电永磁体的强力磁制冷设备。

Towards powerful magnetocaloric devices with static electro-permanent magnets.

机构信息

Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia.

Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia.

出版信息

J Adv Res. 2023 Mar;45:157-181. doi: 10.1016/j.jare.2022.05.001. Epub 2022 May 8.

DOI:10.1016/j.jare.2022.05.001
PMID:35589540
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10006538/
Abstract

INTRODUCTION

Magnetocaloric energy conversion represents an alternative to existing refrigeration, heat pump and energy harvesting technologies. A crucial part of a magnetocaloric device concerns the magnetic field source. It uses mainly rare-earth materials and consists of moving parts and a drive system while displaying a limited energy efficiency and unavailability of fast and variable control of the magnetic field. Recent advances in efficient heat transfer for high-frequency magnetic cooling call for new developments of magnetic field sources that can operate with high efficiency at high frequencies.

OBJECTIVES

We report the concept of an electro-permanent magnetic (EPM) field source that efficiently recovers magnetic energy. In contrast to existing magnets, it allows very well-controlled operation without any moving parts. The main objective of this paper is to present a numerical and experimental study in which such an EPM was designed, built and tested.

METHODS

An extensive numerical investigation of the proposed design was carried out in terms of various geometrical and operating parameters. One of the design variations was built and experimentally evaluated for its energy efficiency and temperature increase at various operating frequencies.

RESULTS

We demonstrate an energy efficiency of these magnets of over 80% and operation with frequencies up to 50 Hz, which is crucial for future high-power-density and high-frequency magnetocaloric devices.

CONCLUSIONS

Considering high energy efficiency at high operating frequencies, such EPMs would allow for miniaturization, making them a viable option for future compact magnetocaloric devices.

摘要

简介

磁热能量转换代表了对现有制冷、热泵和能量收集技术的一种替代方案。磁热设备的一个关键部分涉及磁场源。它主要使用稀土材料，由运动部件和驱动系统组成，同时显示出有限的能量效率和无法快速、灵活地控制磁场。最近在高频磁冷却方面高效传热的进展要求开发新的磁场源，这些磁场源可以在高频下高效运行。

目的

我们报告了一种电永磁（EPM）磁场源的概念，该磁场源可以有效地回收磁能。与现有磁铁相比，它可以在没有任何运动部件的情况下进行非常好的控制操作。本文的主要目的是介绍一种数值和实验研究，其中设计、制造和测试了这种 EPM。

方法

针对各种几何和操作参数，对所提出的设计进行了广泛的数值研究。其中一种设计变体进行了构建，并针对不同工作频率下的能量效率和温度升高进行了实验评估。

结果

我们证明了这些磁铁的能量效率超过 80%，并且可以在高达 50Hz 的频率下工作，这对于未来高功率密度和高频磁热设备至关重要。

结论

考虑到高频下的高能量效率，这种 EPM 可以实现小型化，使其成为未来紧凑型磁热设备的可行选择。

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