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Maintaining Average Torque and Suppressing Torque ripple With T-Shaped Auxiliary Pole for Spoke Type Multi-Consequent-Pole Motor

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IEEE Transactions on Energy Conversion 2025年第2期40卷 1400-1410页

作者： Hidaka, Yuki Takahashi, Sho Kondo, Shota Iezawa, Masahiro Nagaoka University of Technology Department of Electrical Electronics and Information Engineering Nagaoka940-2188 Japan Advanced Technology R&D Center Mitsubishi Electric Corporation Amagasaki661-8661 Japan

A novel stator structure for spoke-type multi-consequent-pole motors was proposed in this paper. While spoke-type multi-consequent pole motors were effective to improve torque density, it was necessary to allow for torque ripple increasing due to the non-uniform magnetic flux density in the air gap. Although torque ripple could be reduced using the I-shaped auxiliary pole reported in the previous study, worsen in average torque was needed to be tolerated. In the proposed motor, T-shaped auxiliary poles were placed on the stator to maintain torque and reduce torque ripple. The point of the proposed motor lies in the magnetic circuit in which the stator coil was divided into upper and lower coils, and the leakage flux, which was generated in the previous auxiliary pole, could be picked by the lower coil. To validate its effectiveness, numerical verification was conducted using the verification model and obtained results were compared with the conventional motors. Moreover, experimental verification was conducted using prototype motors. From the results, it was confirmed that torque ripple could be reduced without decreasing average torque by using the proposed stator structure. © 1986-2012 IEEE.

关键词： Magnetic circuits

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Empirical Study on Heat Transfer Coefficients in Lumped Parameter Thermal Network of direct-Oil Cooled Permanent Magnet Synchronous Motor

Empirical Study on Heat Transfer Coefficients in Lumped Para...

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2024 International Conference on Electrical Machines, ICEM 2024

作者： Chin, Jun-Woo Park, Seojun Hwang, Jaeyeob Kim, deok-Jin Jung, Ho-Chang Korea Automotive Technology Institute Advanced Powertrain R&D Department Cheonan Korea Republic of

ISBN: (纸本)9798350370607

This paper presents an empirical study on heat transfer coefficients within a lumped parameter thermal network (LPTN) applied to a direct oil-cooled permanent magnet synchronous motor (PMSM). The study focuses on identifying unknown parameters within the LPTN, specifically the convection heat transfer coefficient (HTC) of automatic transmission fluid (ATF) oil, as well as the equivalent thermal conductivity and heat capacity of the coil. To improve the reliability of the LPTN, a proposed model for heat transfer by ATF oil is introduced. Additionally, the parameters influencing the convection HTC of ATF oil, including geometry, velocity, and temperature, are analyzed. These unknown parameters are crucial for accurate thermal analysis but those are challenging to determine due to the composite nature of the coil and the complex behavior of ATF oil. To address this challenge, a correlation process with temperature results is conducted, employing design of Experiment (dOE) with Latin Hypercube Sampling (LHS), surrogate modeling with the Kriging method, and optimization with a genetic algorithm (GA). Future work will involve expanding the scope of experimentation to include a wider range of operating points and flow rates, thus providing more comprehensive empirical data for correlation. © 2024 IEEE.

关键词： Lumped parameter networks

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Evaluation of VSK separation in the classification of two mineralogically different iron ore fines

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 260-270页

作者： deepak Nayak Tonmoy Kundu Nilima dash Shiva Kumar I.Angadi S.K.Chaurasiya G.E.Sreedhar T.V.S.Subrahmanyam Swagat S.rath Mineral Processing Department CSIR-Institute of Minerals and Materials TechnologyBhubaneswar 751013India R&D Centre National Mineral Development Corporation LimitedHyderabad 500028India

With gradually diminishing Fe grade in tandem with the ever-increasing demand for high-grade iron ores,iron ore industries are now focusing on the beneficiation of low-grade iron ore fines,mainly considered ***,the scarcity of water at many of the mines’sites and the new water conservation policies of the governments have necessitated research on suitable dry beneficiation *** this context,an effort has been made to evaluate the efficacy of a dry classification unit,such as the VSK separator,in upgrading the iron values of two low-grade Indian iron ore fines,named Sample 1 and Sample *** mineralogical studies,involving scanning electron microscopy and X-ray diffraction,suggest that Sample 1 is a low-grade blue dust sample(51.2wt%Fe)containing hematite and quartz as the major minerals,while Sample 2(53.3wt%Fe)shows the presence of goethite in addition to hematite and *** experiments,carried out using Box-Benkhen statistical design,indicate that blower speed,followed by feed rate,is the most influencing operating parameter in obtaining a good product in the VSK *** optimum levels of the operating factors,a fines product with~55wt%Fe at a yield of~40%can be obtained from Sample 1,while Sample 2 can be upgraded to~56wt%Fe at a yield of~85%.The results suggest that the VSK separator can be employed as an efficient intermediate unit operation in a processing circuit to upgrade the iron contents of iron ore fines.

关键词： iron ore fines dry beneficiation VSK separator Box–Behnken design

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Viewing Angle Control through Electrically-Induced Effective Out-of-Plane retardation differences in Automotive displays

Viewing Angle Control through Electrically-Induced Effective...

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International Symposium, Seminar, and Exhibition, display Week 2024

作者： Choi, Tae-Hoon Wook Lee, Hyun Uk Ha, Jin Department of Advanced Materials R&D Korea Automotive Technology Institute Cheonan31214 Korea Republic of

We report a method for controlling the viewing angle using twisted nematic liquid crystal (TN-LC) materials for automotive display applications. We achieved switching between normal and privacy modes with the change in viewing-angle-dependent retardation through the reorientation of the TN-LC molecules under crossed polarizers by applying a vertical electric field. © 2024, John Wiley and Sons Inc. All rights reserved.

关键词： Nematic liquid crystals

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Unidirectional Viewing Angle Control Using Liquid Crystal Film on the Automotive displays

Unidirectional Viewing Angle Control Using Liquid Crystal Fi...

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2024 Conference on Lasers and Electro-Optics/Pacific rim, CLEO-Pr 2024

作者： Choi, Tae-Hoon Lee, Hyun Wook Ha, Jin Uk Department of Advanced Materials R&D Korea Automotive Technology Institute Cheonan31214 Korea Republic of

We report a method for controlling unidirectional viewing angle in automotive displays using a liquid crystal (LC) film. By electrically controlling the refractive index distribution of the LC film, the light is emitted toward the left side, which indicates that the display panel can be effectively controlled in the direction of the driver between transmission and blocking. © 2024 The Author(s)

关键词： Liquid crystal displays

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Evolution of Nuvoton Microcontroller-based Education Board

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recent Patents on Engineering 2024年第9期18卷 127-139页

作者： Elp, Hudaverdi Emin Inan, remzi Assan EMS Technologies R&D Research and Development Istanbul Umraniye Turkey Department of Electric and Electronics Engineering Faculty of Technology Isparta University of Applied Sciences Isparta Turkey

Background: The novel coronavirus pandemic has not only affected people's health. The pandemic has also affected their social life and work. For all the reasons mentioned, international trade has suffered and is still in the process of recovery. Objective: Especially in the semiconductor industry, many manufacturers postponed their deliveries to future periods and this triggered the chip crisis. Many hightech industries, including the automotive industry, were deeply affected by the consequences of the crisis, with factories halting or slowing down production. despite the shortage of chip stocks, Nuvoton has a large amount of Microcontroller Units (MCUs), but due to the shortage of resources, education and libraries, software developers have not been able to integrate their products in a limited time. Methods: In this paper, the Nuvoton Education Board has presented 20 common examples for embedded software developers and beginners. results: The PCB is designed considering all modules connected to separate General Purpose Input Output (GPIO) pins to make multiple module examples without changing the peripherals and pin configuration of the MCU. Clock configuration has been simplified and unnecessary details have been meticulously removed to make the examples easily understandable. Nuvoton NuMaker M263KI V1.3 was added on the designed PCB. Conclusion: The PCB contains almost all the necessary electronics to learn embedded software and use Nuvoton MCUs in industrial projects. The board is supported with user interfaces and printed documentation. The codes are explained with command lines to teach users even small details. A patent application has been filed for the proposed education board. © 2024 Bentham Science Publishers.

关键词： Embedded systems

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development of Python-Based Applications for Virtual Instrument Control Using PyQt5, PyVISA, and SCPI Protocol 2

Development of Python-Based Applications for Virtual Instrum...

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2nd International Conference on Emerging Trends in Information technology and Engineering, ic-ETITE 2024

作者： rao, Abhishek Singh Sai, deepak Mahajan, Anita Taterao Singh, Vaibhav Pratap Neiwal, rahul Pasupuleti, Haribabu Sudarsan, S.d. Group Bengaluru India Ministry of Electronics and Information Technology R&d in It Group Delhi India Centre for Development of Advanced Computing Bangalore Bengaluru India

ISBN: (纸本)9798350328202

This work aims to create desktop applications to enable virtual access and control to prominent lab equipment like signal generators, oscilloscopes, spectrum analyzers, etc. The developed applications utilize PyQt5 and PyVISA Python libraries, enabling the creation of Graphical User Interfaces (GUIs) and virtual instrument communication. The applications support USB and Ethernet connection between the PC and the instruments. We demonstrate Python-enabled applications to remotely access a Vector Signal Generator, an Oscilloscope and in conjugation, also use an OEM's Spectrum Analyzer PC application to complete a framework for remote signal generation, analysis, and acquisition which can be useful in various research and testing scenarios in the modern hybrid work culture. © 2024 IEEE.

关键词： Spectrum analyzers

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Boosting ultra-wide temperature dielectric stability of multilayer ceramic capacitor through tailoring the combination types of polar nanoregions

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Journal of Materiomics 2024年第4期10卷 751-761页

作者： Jiacheng Liu Kaibiao Xi Beibei Song Huarong Cheng Xiaole Yu Mupeng Zheng Mankang Zhu Yudong Hou College of Materias Science and Engineering Key Laborutory of Advanced Functional Materials Education Ministry of China Beijing University of TechnologyBeijing100124China Materials R&D Department Beijing Yuanliu Hongyuan Eletronic Technology CompanyLtdBeijing102600China

With the rapid development of space exploration and new energy vehicles,it is urgent to build ultra-wide temperature multilayer ceramic capacitors(UWT MLCCs)to match electronic circuits that can withstand harsh environmental *** ferroelectrics with diffuse phase transition feature are potential dielectrics for the construction of UWT ***,how to ensure high dielectric constant together with low dielectric loss in the wide temperature region is still a big ***,the above difficulties are addressed by tailoring the combination types of polar nanoregions(PNrs)in the(1-x)(0.8Na_(0.5)Bi_(0.5)TiO_(3)-0.2K_(0.5)Bi_(0.5)TiO_(3))-xNaTaO3(NBT-KBT-xNT)*** with PNrS types of P4bm+r3c and P4bm+Pbnm,the combination type of P4bm+Pbnm+r3c PNrs in NBT-KBT-0.31NT is the most beneficial to obtain comprehensive excellent dielectric performance because it can balance the relationship between high dielectric constant and temperature stability over a wide temperature ***,by optimizing the laminating pressure and co-firing temperature to realize a tight interfacial structure between the dielectric layer and the Pt inner electrode,a record-high dielectric constant(er=(907%±15%))together with low dielectric loss(tan δ≤0.025)is achieved over an ultra-wide range from-61℃ to 306℃ for NBT-KBT-0.31 NT MLCC,demonstrating that tailoring the combination types of PNrs is a powerful strategy in designing UWT MLCC dielectrics.

关键词： Lead-free dielectrics Ultra-wide temperature Multilayer ceramic capacitor Polar nanoregion

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Systematic analysis of an unreliable batch service retrial queueing system with two sort of vacation

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International Journal of Applied Systemic Studies 2023年第3期10卷 243-264页

作者： Niranjan, S.P. Indhira, K. Chandrasekaran, V.M. Department of Mathematics Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Chennai India Department of Mathematics School of Advanced Sciences VIT Vellore India

This paper concentrates on bulk arrival and batch service retrial queueing system with server failure, two types of vacation and constant retrial rate. If an arrival of customers finds a server is free then batch service will be provided with minimum of one customers and maximum of ‘b’ customers. On the contrary, if the arrival of customers finds the server is busy then entire customers will join in the orbit to explore service again. After service completion, if there are no customers in the orbit then the server leaves for working vacation. during working vacation, the server provides service in lower service rate compared to regular service rate. In the working vacation completion, if the orbit size is zero then the server leaves for non-working vacation. The server may get failure in working period. If the server got failure with probability (φ) then the renewal of service station will be considered. On the other hand, if there is no breakdown and orbit is empty then the server leaves for working vacation with probability (1 – φ). For this designed queueing model probability generating function of the orbit size will be obtained. Various performance measures are also be derived with suitable numerical illustrations. Copyright © 2023 Inderscience Enterprises Ltd.

关键词： Sales

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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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