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Machines
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New Advances in Synchronous Reluctance Motors
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New Advances in Synchronous Reluctance Motors

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Electrical Machines and Drives".

Deadline for manuscript submissions: 30 April 2026 | Viewed by 3679

Special Issue Editor

Dr. Kyu-yun Hwang

E-Mail Website
Guest Editor
School of Electronic Engineering, Kumoh National Institute of Technology, Gumi 39177, Gyungbuk, Republic of Korea
Interests: optimal design of electric motors

Special Issue Information

Dear Colleagues,

Synchronous Reluctance Motors (SynRMs) have gained significant attention in recent years due to their high efficiency, cost-effectiveness, and reduced dependency on rare-earth materials. Advances in rotor design, material optimization, and control algorithms have further enhanced their performance, making them ideal for industrial, automotive, and energy applications. Furthermore, SynRMs exhibit inherent robustness and require minimal maintenance, contributing to their overall reliability and long service life. To ensure optimal performance and longevity of SynRMs, regular maintenance practices are essential.

This paper explores the latest developments in SynRM technology, focusing on innovative design approaches and emerging trends that promise to reshape the future of electric motor applications.

Dr. Kyu-yun Hwang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Machines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • loss analysis in synchronous reluctance motors
  • advanced control techniques for SynRMs
  • high-efficiency design strategies
  • fault-tolerant synchronous reluctance motors
  • material optimization for SynRMs
  • thermal management in SynRM systems
  • applications of synchronous reluctance motors
  • cost-effective manufacturing of SynRMs
  • innovative rotor design for enhanced performance
  • energy-efficient SynRM drive systems

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Published Papers (2 papers)

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Research

18 pages, 15086 KB  
Article
Design of a PM-Assisted Synchronous Reluctance Motor with Enhanced Performance and Lower Cost for Household Appliances
by Yuli Bao and Chenyang Xia
Machines 2025, 13(10), 954; https://doi.org/10.3390/machines13100954 - 16 Oct 2025
Viewed by 717
Abstract
Conventional permanent magnet-assisted synchronous reluctance machine (PMaSynRM) suffers from limited power factor and efficiency. To boost these, the use of sintered rare earth permanent magnets (PMs) is an option, with respect to sintered ferrite, resulting in a high-performance PMaSynRM (HP-PMaSynRM). However, the increasing [...] Read more.
Conventional permanent magnet-assisted synchronous reluctance machine (PMaSynRM) suffers from limited power factor and efficiency. To boost these, the use of sintered rare earth permanent magnets (PMs) is an option, with respect to sintered ferrite, resulting in a high-performance PMaSynRM (HP-PMaSynRM). However, the increasing price of rare earth PM can lead to an overall increase in machine cost. To overcome this issue, a novel HP-PMaSynRM is presented in this paper. Structurally, the proposed four-pole HP-PMaSynRM rotor is characterized by two fluid-shaped flux barriers filled with sintered ferrite, as well as a cut-off region. Based on the finite element analysis (FEA) results, the proposed HP-PMaSynRM exhibits higher performance compared with the conventional HP-PMaSynRM with rare earth PMs. It is shown that the proposed HP-PMaSynRM has higher power factor, efficiency, and better torque quality over a wide range of operating conditions. Moreover, the HP-PMaSynRM presented incurs lower cost. Finally, the proposed HP-PMaSynRM is manufactured, tested, and compared with the conventional benchmark HP-PMaSynRM, proving its advantages, including higher power factor, higher efficiency, lower torque oscillation, and lower cost. Full article
(This article belongs to the Special Issue New Advances in Synchronous Reluctance Motors)
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19 pages, 2177 KB  
Article
Current- and Vibration-Based Detection of Misalignment Faults in Synchronous Reluctance Motors
by Angela Navarro-Navarro, Vicente Biot-Monterde, Jose E. Ruiz-Sarrio and Jose A. Antonino-Daviu
Machines 2025, 13(4), 319; https://doi.org/10.3390/machines13040319 - 14 Apr 2025
Cited by 2 | Viewed by 2291
Abstract
Misalignment faults in drive systems occur when the motor and load are not properly aligned, leading to deviations in the centerlines of the coupled shafts. These faults can cause significant damage to bearings, shafts, and couplings, making early detection essential. Traditional diagnostic techniques [...] Read more.
Misalignment faults in drive systems occur when the motor and load are not properly aligned, leading to deviations in the centerlines of the coupled shafts. These faults can cause significant damage to bearings, shafts, and couplings, making early detection essential. Traditional diagnostic techniques rely on vibration monitoring, which provides insights into both mechanical and electromagnetic fault signatures. However, its main drawback is the need for external sensors, which may not be feasible in certain applications. Alternatively, motor current signature analysis (MCSA) has proven effective in detecting faults without requiring additional sensors. This study investigates misalignment faults in synchronous reluctance motors (SynRMs) by analyzing both vibration and current signals under different load conditions and operating speeds. Fast Fourier transform (FFT) is applied to extract characteristic frequency components linked to misalignment. Experimental results reveal that the amplitudes of rotational frequency harmonics (1xfr, 2xfr, and 3xfr) increase in the presence of misalignment, with 1xfr exhibiting the most stable progression. Additionally, acceleration-based vibration analysis proves to be a more reliable diagnostic tool compared to velocity measurements. These findings highlight the potential of combining current and vibration analysis to enhance misalignment detection in SynRMs, improving predictive maintenance strategies in industrial applications. Full article
(This article belongs to the Special Issue New Advances in Synchronous Reluctance Motors)
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