Pub Date : 2025-11-26DOI: 10.1109/TMAG.2025.3634893
{"title":"IEEE Magnetics Society Information","authors":"","doi":"10.1109/TMAG.2025.3634893","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3634893","url":null,"abstract":"","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 12","pages":"C2-C2"},"PeriodicalIF":1.9,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11269913","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145600710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-05DOI: 10.1109/TMAG.2025.3627379
{"title":"TechRxiv: Share Your Preprint Research with the World!","authors":"","doi":"10.1109/TMAG.2025.3627379","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3627379","url":null,"abstract":"","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 11","pages":"1-1"},"PeriodicalIF":1.9,"publicationDate":"2025-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11230195","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145455959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-05DOI: 10.1109/TMAG.2025.3625119
{"title":"IEEE Magnetics Society Information","authors":"","doi":"10.1109/TMAG.2025.3625119","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3625119","url":null,"abstract":"","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 11","pages":"C2-C2"},"PeriodicalIF":1.9,"publicationDate":"2025-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11230197","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145455799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-03DOI: 10.1109/TMAG.2025.3628061
Dávid Sivý;Jozef Strečka
We investigate the deformable quantum spin-1/2 XX chain in a transverse magnetic field, which is exactly solvable via the Jordan–Wigner transformation under the assumption of a linear dependence of the exchange interaction on uniform lattice distortion. By calculating the magnetization, magnetic susceptibility, distortion parameter, and inverse compressibility, we explore the coupled magnetic and elastic properties of the deformable quantum spin chain. It is demonstrated that the deformable spin-1/2 XX chain in a transverse magnetic field exhibits a line of discontinuous phase transitions emerging at low but finite temperatures, which terminates at a critical point corresponding to a continuous phase transition. The discontinuous thermal phase transitions are accompanied by magnetic hysteresis due to metastable states, which gradually vanishes as the temperature increases.
{"title":"Thermal Phase Transitions in a Deformable Quantum Spin-1/2 XX Chain in a Transverse Magnetic Field","authors":"Dávid Sivý;Jozef Strečka","doi":"10.1109/TMAG.2025.3628061","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3628061","url":null,"abstract":"We investigate the deformable quantum spin-1/2 XX chain in a transverse magnetic field, which is exactly solvable via the Jordan–Wigner transformation under the assumption of a linear dependence of the exchange interaction on uniform lattice distortion. By calculating the magnetization, magnetic susceptibility, distortion parameter, and inverse compressibility, we explore the coupled magnetic and elastic properties of the deformable quantum spin chain. It is demonstrated that the deformable spin-1/2 XX chain in a transverse magnetic field exhibits a line of discontinuous phase transitions emerging at low but finite temperatures, which terminates at a critical point corresponding to a continuous phase transition. The discontinuous thermal phase transitions are accompanied by magnetic hysteresis due to metastable states, which gradually vanishes as the temperature increases.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 12","pages":"1-4"},"PeriodicalIF":1.9,"publicationDate":"2025-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145600672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-31DOI: 10.1109/TMAG.2025.3627652
Kyoung-Min Kim;Myeong-Hwan Hwang;Eugene Kim;Hyun-Rok Cha
This article presents an arc-shaped rotor-notch topology for reducing cogging torque in axial flux permanent magnet (AFPM) motors. Unlike traditional techniques such as magnet skewing or segmentation, which often increase manufacturing complexity, the proposed notch enables localized flux attenuation without altering the stator or magnet volume. By aligning the notch with high-flux-density regions beneath the magnet edge, the design passively modulates magnetic energy and suppresses cogging torque. To evaluate the effectiveness of the proposed notch geometry, we propose a geometry-sensitive analytical indicator that combines magnetic field strength with flux attenuation efficiency. This indicator serves as a theoretical tool to guide notch design and is shown to correlate well with finite element analysis (FEA) and experimental results, including a 27.5% reduction in cogging torque and only a 5.4% decrease in average torque. This approach offers a simple, cost-effective, and scalable solution for cogging torque suppression without compromising performance or manufacturability. It is especially suitable for AFPM drives employing bobbin-inserted windings, where wider slot openings tend to amplify cogging torque. This insight offers a new strategy for geometry-driven rotor design optimization in precision electric mobility systems.
{"title":"Cogging Torque Reduction in Axial Flux Permanent Magnet Motor Using Arc-Notched Rotor: Design and Experimental Validation","authors":"Kyoung-Min Kim;Myeong-Hwan Hwang;Eugene Kim;Hyun-Rok Cha","doi":"10.1109/TMAG.2025.3627652","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3627652","url":null,"abstract":"This article presents an arc-shaped rotor-notch topology for reducing cogging torque in axial flux permanent magnet (AFPM) motors. Unlike traditional techniques such as magnet skewing or segmentation, which often increase manufacturing complexity, the proposed notch enables localized flux attenuation without altering the stator or magnet volume. By aligning the notch with high-flux-density regions beneath the magnet edge, the design passively modulates magnetic energy and suppresses cogging torque. To evaluate the effectiveness of the proposed notch geometry, we propose a geometry-sensitive analytical indicator that combines magnetic field strength with flux attenuation efficiency. This indicator serves as a theoretical tool to guide notch design and is shown to correlate well with finite element analysis (FEA) and experimental results, including a 27.5% reduction in cogging torque and only a 5.4% decrease in average torque. This approach offers a simple, cost-effective, and scalable solution for cogging torque suppression without compromising performance or manufacturability. It is especially suitable for AFPM drives employing bobbin-inserted windings, where wider slot openings tend to amplify cogging torque. This insight offers a new strategy for geometry-driven rotor design optimization in precision electric mobility systems.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 12","pages":"1-15"},"PeriodicalIF":1.9,"publicationDate":"2025-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145600696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-31DOI: 10.1109/TMAG.2025.3627674
Yiduan Chen;Yutong Zheng
This article presents a novel dual-stator hybrid multi-excitation flux-modulated machine (DS-HMFMM). The proposed machine employs symmetrically arranged alternating Halbach three-segment permanent magnets (Hal-PMs) and iron poles, which together form a “FeNFe–FeNFe” consequent-pole (CP) configuration. This design effectively concentrates the magnetic flux while minimizing flux leakage. The rotor features trapezoidal PMs (TPMs) embedded within a trapezoidal iron core, which aids in alleviating core saturation, thereby enhancing torque density and improving the utilization of PMs. Furthermore, the interaction between the rotor and stator iron poles modulates the magnetic field generated by the stator PMs, resulting in a bidirectional flux modulation effect that further amplifies torque output. The topology of the proposed DS-HMFMM is introduced, and its operational principles are elucidated based on a simplified magnetomotive force (MMF)-permeance model. Subsequently, an analysis is conducted to examine how pole–slot combinations and stator–rotor dimensions influence performance. To validate the advantages of the proposed DS-HMFMM, finite element analysis (FEA) and air-gap harmonic analysis are performed. A comparative study with traditional three-alternating-pole split-tooth PM Vernier machines (T-CPM STVM) is also presented. Finally, the id = 0 dual-loop field-oriented control (Dual-loop FOC) strategy was implemented in the DS-HMFMM} to evaluate its operational characteristics under various working conditions. The results demonstrate that, in comparison to conventional T-CPM} STVM designs, the proposed DS-HMFMM} achieves a 42% increase in torque density, maintains torque ripple within 3%, delivers a 37% improvement in output power, shows an efficiency enhancement of 2.7%, and exhibits superior dynamic performance.
{"title":"Design and Analysis of a New Dual-Stator Hybrid Multi-Field Modulation Machine With Trapezoidal PMs","authors":"Yiduan Chen;Yutong Zheng","doi":"10.1109/TMAG.2025.3627674","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3627674","url":null,"abstract":"This article presents a novel dual-stator hybrid multi-excitation flux-modulated machine (DS-HMFMM). The proposed machine employs symmetrically arranged alternating Halbach three-segment permanent magnets (Hal-PMs) and iron poles, which together form a “FeNFe–FeNFe” consequent-pole (CP) configuration. This design effectively concentrates the magnetic flux while minimizing flux leakage. The rotor features trapezoidal PMs (TPMs) embedded within a trapezoidal iron core, which aids in alleviating core saturation, thereby enhancing torque density and improving the utilization of PMs. Furthermore, the interaction between the rotor and stator iron poles modulates the magnetic field generated by the stator PMs, resulting in a bidirectional flux modulation effect that further amplifies torque output. The topology of the proposed DS-HMFMM is introduced, and its operational principles are elucidated based on a simplified magnetomotive force (MMF)-permeance model. Subsequently, an analysis is conducted to examine how pole–slot combinations and stator–rotor dimensions influence performance. To validate the advantages of the proposed DS-HMFMM, finite element analysis (FEA) and air-gap harmonic analysis are performed. A comparative study with traditional three-alternating-pole split-tooth PM Vernier machines (T-CPM STVM) is also presented. Finally, the id = 0 dual-loop field-oriented control (Dual-loop FOC) strategy was implemented in the DS-HMFMM} to evaluate its operational characteristics under various working conditions. The results demonstrate that, in comparison to conventional T-CPM} STVM designs, the proposed DS-HMFMM} achieves a 42% increase in torque density, maintains torque ripple within 3%, delivers a 37% improvement in output power, shows an efficiency enhancement of 2.7%, and exhibits superior dynamic performance.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 12","pages":"1-12"},"PeriodicalIF":1.9,"publicationDate":"2025-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145600704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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