Journal of Advanced Research ( IF 11.4 ) Pub Date : 2022-05-08 , DOI: 10.1016/j.jare.2022.05.001 Urban Tomc 1 , Simon Nosan 1 , Katja Klinar 1 , Andrej Kitanovski 1
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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.
中文翻译：
迈向具有静态电永磁体的强大磁热装置
介绍
磁热能量转换代表了现有制冷、热泵和能量收集技术的替代方案。磁热装置的一个关键部分与磁场源有关。它主要使用稀土材料，由运动部件和驱动系统组成，但能源效率有限，无法对磁场进行快速和可变控制。高频磁冷却高效传热的最新进展要求能够在高频下高效运行的磁场源的新发展。
目标
我们报告了可有效回收磁能的电永磁 (EPM) 场源的概念。与现有的磁铁相比，它可以在没有任何移动部件的情况下实现非常好的控制操作。本文的主要目的是提出一个数值和实验研究，其中设计、构建和测试了这样一个 EPM。
方法
根据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。构建了其中一种设计变体，并通过实验评估了其在各种工作频率下的能效和温升。
结果
我们展示了这些磁体的能效超过 80%，工作频率高达 50 Hz，这对于未来的高功率密度和高频磁热装置至关重要。
结论
考虑到高工作频率下的高能效，此类 EPM 将允许小型化，使其成为未来紧凑型磁热设备的可行选择。
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