In the last decade, the trend toward higher efficiency and higher torque density electrical machines (EMs) without permanent magnets (PMs) for the industrial sector has rapidly increased. This work discusses the latest research and industrial advancements in synchronous reluctance machines (SynRMs), being the emergent motor topology gaining wide acceptance by many industries. This article presents an extensive literature review covering the background and evolvement of SynRM, including the most recent developments. Nowadays, SynRM has found its niche in the EM market, and the reasons for that are highlighted in this work together with its advantages and disadvantages. The key journal publications in SynRM topics are discussed presenting the biggest challenges and the latest advancements with particular regards to the design methodology. This article aims to provide a thorough overview to the research community and industry about SynRM. There is a clear potential for SynRM to take over a significant portion of the EM market in the near future to meet efficiency standards in industrial applications without the use of rare-Earth PM technology.

中文翻译：

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同步磁阻机：综合回顾和技术比较

在过去的十年中，工业部门向更高效率和更高扭矩密度的无永磁体 (PM) 电机 (EM) 发展的趋势迅速增加。这项工作讨论了同步磁阻电机 (SynRM) 的最新研究和工业进步，同步磁阻电机是许多行业广泛接受的新兴电机拓扑。本文介绍了广泛的文献综述，涵盖了 SynRM 的背景和演变，包括最近的发展。如今，SynRM 已在 EM 市场找到了自己的位置，本文重点阐述了其原因及其优缺点。讨论了 SynRM 主题中的主要期刊出版物，提出了最大的挑战和特别是在设计方法方面的最新进展。本文旨在为研究界和行业提供有关 SynRM 的全面概述。在不使用稀土 PM 技术的情况下，SynRM 显然有可能在不久的将来占据 EM 市场的很大一部分以满足工业应用的效率标准。