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Asymmetric Slit Structure of IPMSM rotor for High Torque, High Output, and Torque ripple reduction

IEEJ Transactions on Industry Applications 2025年第3期145卷 147-158页

作者： Takahashi, Tomohira Kitao, Junji Miyama, Yoshihiro Nakano, Masatsugu Advanced Technology R&D Center Mitsubishi Electric Co 8-1-1 Tsukaguchi-Honmachi Hyogo Amagasaki661-8661 Japan Mitsubishi Electric Mobility Co 840 Chiyoda-cho Hyogo Himeji670-8677 Japan

This paper discusses asymmetric slit structures in a rotor that can reduce torque ripple as well as increase torque and output for concentrated winding interior permanent magnet synchronous motors. A motor with rotor asymmetric slits in forward rotation can reduce the torque ripple as opposed to a symmetric motor without asymmetric slits because of the effect of the asymmetric slits in increasing the instantaneous minimum torque. Furthermore, the more the outer diameter tip of the asymmetric slits is moved in the direction opposite to rotation, the smaller the torque ripple can be. In the reverse direction, torque ripple increases from forward rotation by the effect of asymmetric slits. However, by adding notches on the rotor core surface, the instantaneous maximum torque can be lowered and the torque ripple can be reduced. © 2025 The Institute of Electrical Engineers of Japan.

关键词： Permanent magnets

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daily Unit Commitment Optimization under Uncertainty in Market Price of Electricity and reserve

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IEEJ Transactions on Power and Energy 2025年第4期145卷 369-377页

作者： Naito, Kento Takai, Shigemasa Kitamura, Shoichi Mori, Kazuyuki Advanced Technology R&D Center Mitsubishi Electric Corporation 8-1-1 Tsukaguchi-Honmachi Amagasaki661-8661 Japan Graduate School of Engineering Osaka University 2-1 Yamada-Oka Suita565-0871 Japan

discussions are underway to make the reserve market to a day-ahead market starting in 2026. When it is realized, power producers need to make three types of plans for the next day: a unit commitment, bids for electricity market, and bids for reserve market. In a free competition, power producer needs to make these plans ensuring a stable earning. In this study, we present a practical method to plan a risk-averse unit commitment along with bids for electricity market, and reserve market. The numerical results show that a proposed method improves CVar of a revenue from 1.40 to 5.14% within one hour of calculation time. © 2025 The Institute of Electrical Engineers of Japan.

关键词： Power markets

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High-Temperature-resistant Aerogel Composites for Pressure and Temperature Sensing

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Chemistry of Materials 2025年第9期37卷 3295-3304页

作者： Chen, Yankun Yan, Xue Wang, rui Jin, Gaoling Kong, Lei Xu, Qian Zhao, Hongyang Kuang, Minxuan Zhang, Xiuqin Beijing Key Laboratory of Clothing Materials R & D and Assessment Beijing Engineering Research Center of Textile Nanofiber School of Materials Design & Engineering Beijing Institute of Fashion Technology Beijing100029 China Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials & Processing Technology Beijing100076 China

robust high-temperature intelligent composite materials exhibit vast potential in the aerospace, fire protection, and energy sectors. The common fabrication approach of high-temperature intelligent composites involves embedding optical fibers or rigid sensors within the composite. However, this approach endangers the structural integrity of the composite, potentially inducing mechanical damage under increased pressure. In this work, flexible silica aerogel/fabric composites (SAFCs) with temperature and pressure sensing capabilities at elevated temperatures were fabricated via printing and composite techniques. The SAFC pressure sensor benefits from robust mechanical and thermal properties, providing long-term reliable sensing performance at elevated temperatures up to 300 °C with a rapid response time (300 ms), large detection range (0-380 kPa), and significant fatigue resistance. SAFC’s outstanding thermal insulation established a temperature gradient across the heat source and environment, allowing thermoelectric potential production via the Seebeck effect and response to temperature alterations. This study presents a concept for fabricating aerogel/fabric sensing composites that can be applied in high-temperature environments. © 2025 American Chemical Society.

关键词： Thermal insulation

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drive Stabilization of Multi-degree-of-Freedom Maglev Planar Motor Based on Closed Loop System Identification

Drive Stabilization of Multi-Degree-of-Freedom Maglev Planar...

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2025 IEEE International Conference on Mechatronics, ICM 2025

作者： Nakata, Keigo Ohnishi, Wataru Koseki, Takafumi Nakamura, Yuichiro Takahashi, Kenji Sekiguchi, Hiroyuki The University of Tokyo Dept. of Electrical Engineering and Information systems Tokyo Japan Advanced Technology R&D Center Mitsubishi Electric Corporation Hyogo Japan

ISBN: (纸本)9798331533892

Magnetic levitation planar motor can move at high speed and with high accuracy, and prevent vibration and noise because of no friction. This technology leads to the application of a transport system that requires high-speed and high-precision movement. However, the design of appropriate control algorithms is essential to achieve stability and high-speed, high-precision control of the maglev planar motor. In this research, we stabilized a maglev planar motor on the basis of system identification. Initially, we designed a whole control system for the movement of the maglev planar motor. Furthermore, we conducted system identification and verified that the maglev planar motor works with the designed control system and evaluated its motion performance. Through experiments, it was confirmed that accurate motion control was possible. This research is expected to be a basis for improving control performance soon. © 2025 IEEE.

关键词： degrees of freedom (mechanics)

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Ab initio calculation of hyper-neutron matter

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Science Bulletin 2025年第6期70卷 825-828页

作者： Hui Tong Serdar Elhatisari Ulf-G.Meißner Helmholtz-Institut für Strahlen-und Kernphysik and Bethe Center for Theoretical Physics Universität BonnBonnD-53115Germany Faculty of Natural Sciences and Engineering Gaziantep Islam Science and Technology UniversityGaziantep27010Turkey Interdisciplinary Research Center for Industrial Nuclear Energy(IRC-INE) King Fahd University of Petroleum and Minerals(KFUPM)Dhahran31261Saudi Arabia Institute for Advanced Simulation(IAS-4) Forschungszentrum JülichJülichD-52425Germany Center for Advanced Simulation and Analytics(CASA) Forschungszentrum JülichJülichD-52425Germany Tbilisi State University Tbilisi0186Georgia Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China

In the era of multi-messenger astronomy,neutron stars arguably stand out as the most captivating astrophysical objects[1].Neutron stars consist of the densest form of baryonic matter observed in the universe,and within their interiors,exotic new forms of matter may exist[2].With the detection of various neutron star phenomena in recent years,such as gravitational waves and electromagnetic radiation,more valuable information regard-ing the mysterious dense matter within their cores will be *** findings,together with the measurements of the masses or radii,strongly constrain the neutron star matter equation of state(EoS)and theoretical models of their composition.

关键词： electromagnetic radiationmore astrophysical objects neutron stars ab initio calculations dense matter baryonic matter gravitational waves neutron star phenomena hyper neutron matter

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Unveiling the roles of initial phase constituents and phase metastability in hydrogen embrittlement of TrIP-assisted VCrCoFeNi medium-entropy alloys

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材料科学技术（英文版） 2025年第4期207卷 160-176页

作者： Sang Yoon Song dae Cheol Yang Han-Jin Kim Sang-In Lee Hyeon-Seok do Byeong-Joo Lee Alireza Zargaran Seok Su Sohn Department of Materials Science and Engineering Korea University 02841 SeoulRepublic of Korea Green Energy Materials Research Team Hyundai Motor Company Uiwang R&D Center 16082 UiwangRepublic of Korea Institue of Advanced Technology Development Hyundai Motor Group 13529 SeongnamRepublic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology 37673 PohangRepublic of Korea Graduate Institute of Ferrous & Energy Materials Technology Pohang University of Science and Technology37673 PohangRepublic of Korea

Medium-entropy alloys(MEAs)that exhibit transformation-induced plasticity(TrIP)from face-centered cubic(FCC)to body-centered cubic(BCC)are considered promising for liquid hydrogen environments due to their remarkable cryogenic ***,studies on hydrogen embrittlement(HE)in BCC-TrIP MEAs have not been conducted,although the TrIP effect and consequent BCC martensite usually deteri-orate HE *** these alloys,initial as-quenched martensite alters hydrogen diffusion and trap behavior,and deformation-induced martensitic transformation(dIMT)provides preferred crack propaga-tion sites,which critically affects HE ***,this study aims to investigate the HE behav-ior of BCC-TrIP MEAs by designing four V10Cr10Co30Fe50-xNix(x=0,1,2,and 3 at％)MEAs,adjusting both the initial phase constituent and phase metastability.A decreased Ni content leads to a reduced fraction and mechanical stability of FCC,which in turn increases HE susceptibility,as determined through electro-chemical hydrogen pre-charging and slow-strain rate tests The permeation test and thermal desorption analysis reveal that the hydrogen diffusivity and content are affected by initial BCC fraction,interconnec-tivity of BCC,and refined *** these initial phase constituents differ between the alloys with FCC-and BCC-dominant initial phase,microstructural factors affecting HE are unveiled discretely among these al-loy groups by correlation of hydrogen-induced crack behavior with hydrogen diffusion and trap *** alloys with an FCC-dominant initial phase,the initial BCC fraction and dIMT initiation rate emerge as critical factors,rather than the extent of *** BCC-dominant alloys,the primary contributor is an increase in the initial BCC fraction,rather than the extent or rate of *** unraveled roles of microstructural factors provide insights into designing HE-resistant BCC-TrIP MEAs.

关键词： Medium-entropy alloys(MEAs) Transformation-induced plasticity(TrIP) Hydrogen embrittlement Hydrogen-induced crack Hydrogen diffusion and trapping

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Proposal and Verification of a Novel doubly-Excited Variable-Flux Consequent Pole Motor

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IEEJ Transactions on Industry Applications 2025年第5期145卷 385-393页

作者： Yokota, Keito Matsushita, Yoshiki Mitsuda, Hiroshi Fukami, Tadashi Koyama, Masato Tanaka, Toshinori Graduate School of Engineering Kanazawa Institute of Technology 7-1 Ohgigaoka Nonoichi921-8501 Japan Advanced Technology R&D Center Mitsubishi Electric Corporation 8-1-1 Tsukaguchi-Honmachi Amagasaki661-8661 Japan Nagoya Works Mitsubishi Electric Corporation 5-1-14 Yadaminami Higashi-ku Nagoya461-8670 Japan

In this paper, we propose a new type of hybrid excited motor called "doubly-excited variable-flux consequent pole motor (deVFCM)". The deVFCM consists of a three-phase double Y-connected armature winding with two neutral points, O1 and O2, and field poles with alternating permanent magnet and iron poles. When a dC voltage for supplying the field current is applied across O1 and O2 in such a configuration, the armature winding also acts as a field winding, and the magnetic flux through the iron poles can be adjusted. To validate the principle of this deVFCM, a prototype machine was fabricated, and the basic characteristics of the prototype machine were investigated through three-dimensional finite element analysis and experiments. The results show that both high torque generation and loss reduction at high speeds can be achieved by adjusting the field current. © 2025 The Institute of Electrical Engineers of Japan.

关键词： Permanent magnets

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Cavitation detection Method for Pumps Based on Motor Current Signature Analysis

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IEEJ Transactions on Industry Applications 2025年第1期145卷 46-52页

作者： Kamino, Yasuhiro Kanemaru, Makoto Shinozuka, ryotaro Iwawaki, Tomoyuki Hirakida, Ken Irikiin, Koji Miyauchi, Toshihiko Advanced Technology R&D Center Mitsubishi Electric Corp. 8-1-1 Tsukaguchi-Honmachi Hyogo Amagasaki661-8661 Japan Kobe Center Mitsubishi Electric Corp. 1-1-2 Wadasakicho Hyogo-ku Hyogo Kobe652-0854 Japan Power Distribution System Center Mitsubishi Electric Corp. 8 Horai-cho Kagawa Marugame763-8516 Japan

Simple and cost-effective methods for cavitation detection are required for the stable operation of pump systems. Previous researches on cavitation detection systems have used microphones or vibration sensors, however they are costly and difficult to install. recently, motor current signature analysis (MCSA) has been gaining attention with regard to motor fault detection. In this paper, we review the characteristics of motor current signals in a cavitation state and propose an MCSA technique for pump cavitation detection. We observed that the foot around the fundamental harmonic spectrum in the power spectral density (PSd) of current signals increased in a cavitation state. Based on these results, we propose defining an evaluation value that reflects the foot and using it for cavitation detection. © 2025 The Institute of Electrical Engineers of Japan.

关键词： Cavitation

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InGaZnO4 and In2O3 Mobility Trend: The role of Structural disorder from Amorphous to Crystalline States

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ACS Materials Letters 2025年 2024-2030页

作者： Jang, Hyeongjun Kim, Taehyun Lee, Wonsok Cho, Minhee Ha, daewon Alam, Muhammad A. Ye, Peide d. Jeong, Changwook Graduate School of Semiconductor Materials and Devices Engineering Ulsan National Institute of Science and Technology Ulsan44919 Korea Republic of Advanced Device Research Lab Semiconductor R&D Center Samsung Electronics Suwon16677 Korea Republic of School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States

This study investigates the mobility trends of indium-gallium-zinc oxide (IGZO) thin-film transistors over a wide range of fabrication conditions, from amorphous to crystalline phases. By utilizing machine learning potential (MLP) to generate 70 distinct IGZO structures, we analyze electron mobility while taking into account structural disorder and electron scattering mechanisms. Our findings reveal that mobility peaks at the transition from amorphous to nanocrystalline phases, and then, as more ordered, crystalline structures emerge, the mobility decreases sharply due to the distortion of polyhedron of indium-oxygen in well-ordered regions. These results offer critical insights into optimizing the fabrication conditions for high-performance IGZO devices by identifying the ideal structural phase for achieving maximum mobility. © 2025 American Chemical Society.

关键词： Electron scattering

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Improved photovoltaic performance of un-doped FAPbI₃ thin film based solar cells via de-trapping excitons

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Chinese Journal of Physics 2025年 95卷 790-802页

作者： Chang, Wen-Hsin Huang, Yi-Chun Chandel, Anjali Chiang, Shou-En Wu, Jia-ren Chang, Sheng Hsiung Department of Physics Chung Yuan Christian University Taoyuan 320314 Taiwan Rsearch Center for Semiconductor Materials and Advanced Optics Chung Yuan Christian University Taoyuan 320314 Taiwan R&D Center for Membrane Technology and Center for Nanotechnology Chung Yuan Christian University Taoyuan 320314 Taiwan Department of Optoelectronics and Materials Technology National Taiwan Ocean University Keelung 202301 Taiwan

Stable and photoactive un-doped α-phase formamidinium lead iodide (α-FAPbI3) thin film can be formed on top of the P3CT/ITO/glass sample via using a dimethylformamide:N-Methyl-2-pyrrolidone:dimethyl sulfoxide (dMF:N... 详细信息

Stable and photoactive un-doped α-phase formamidinium lead iodide (α-FAPbI₃) thin film can be formed on top of the P3CT/ITO/glass sample via using a dimethylformamide:N-Methyl-2-pyrrolidone:dimethyl sulfoxide (dMF:NMP:dMSO) mixture as the precursor solvent. The absorbance spectra, photoluminescence spectra, X-ray diffraction patterns, and raman scattering spectra show that the molecular packing structure of the fullerene electron transport layer largely influences the photovoltaic performance of the resultant inverted-type FAPbI₃ solar cells due to the formation of induced δ-phase FAPbI₃ from the amorphous region. In the optimized FAPbI₃ solar cells, the power conversion efficiency (PCE) largely increases from 7.64 % to 12.31 % after 15 days due to the formation of photoactive α-FAPbI₃:δ-FAPbI₃:PbI₂ composite thin film. Our findings show that it is possible to increase the PCE of un-doped α-FAPbI₃ solar cells via increasing the phase transition from amorphous FAPbI₃ to α-FAPbI₃. © 2025 The Physical Society of the republic of China (Taiwan)

关键词： Fullerene electron transport layer Passivation-induced phase transition Solar cells Un-doped α-FAPbI3

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