KOSAKA Takashi

写真a

Affiliation Department

Department of Electrical and Mechanical Engineering
Department of Electrical and Mechanical Engineering

Title

Professor

Contact information

Contact information

Homepage

http://motion.elcom.nitech.ac.jp

External Link

Degree

  • Master (Engineering) ( Nagoya Institute of Technology )

  • Doctor (Engineering) ( Nagoya Institute of Technology )

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Control and system engineering

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Power engineering

From School

  • Nagoya Institute of Technology   Faculty of Engineering   Department of electrical and computer engineering   Graduated

    - 1994.03

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    Country:Japan

From Graduate School

  • Nagoya Institute of Technology   Graduate School, Division of Engineering   Department of electrical and computer engineering   Doctor's Course   Completed

    - 1999.03

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    Country:Japan

  • Nagoya Institute of Technology   Graduate School, Division of Engineering   Department of electrical and computer engineering   Master's Course   Completed

    - 1996.03

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    Country:Japan

External Career

  • Faculty of Engieering, University of Leicester, United Kingdom, Studies on Computer Aided Optimum Design for Application Specific Electric Motors

    2002.11 - 2004.10

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    Country:United Kingdom

Professional Memberships

  • IEEE(Institute of Electrical and Electronic Engineers)

    2003.10

  • The Institute of Electrical Engineers of Japan

    1994.07

  • The Japna Institute of Power Electronics

    2001.04

  • The Insititute of Electrical Installation Engineers of Japan

    2009.10

  • 科学技術交流財団

    2005.04

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Research Career

  • SMCコアを利用したハイブリッド界磁モータの研究開発

    Contract Research  

    Project Year: 2008.07

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    ハイブリッド自動車駆動用モータとして適した可変界磁磁束制御機能を有し,省レアアース磁石で高出力密度を実現するハイブリッド界磁モータの研究開発

  • 小型・軽量ネオジム系永久磁石モータの省希土構造設計法の研究

    Grant-in-Aid for Scientific Research  

    Project Year: 2007.04 - 2010.03

  • 用途指向形低コスト位置センサレスブラシレスACモータドライブの最適システム設計

    Grant-in-Aid for Scientific Research  

    Project Year: 2005.04 - 2007.03

Papers

  • High Speed Homopolar Type Permanent Magnet Motor Designed for Fast Acceleration Response Reviewed International journal

    Hideaki Arita, Kazuhiro Nishiwaki, Masahiro Iezawa, Takashi Kosaka

    IEEJ Journal of Industry Applications   11 ( 6 )   763 - 770   2022.11

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electrical Engineers in Japan  

    This paper presents design studies on a rotor for a high-speed homopolar type permanent magnet motor that can be applied to super chargers for automobiles, cordless stick vacuum cleaners and so forth. The stator comprises a core and a permanent magnet. The rotor is composed of only a core, resulting in enabling the removal of a retaining ring on the surface. Firstly, acceleration performance simulation using a prototype motor with a load blade was developed based on the data measured in an air compressor drive. Subsequently, the rotor shape design refinements based on three-dimensional (3D) finite element analysis were conducted to achieve the maximum torque and power required from a target application under a constraint of core stack length. The design refinement results proven by the acceleration performance of the developed simulation reveal that following the refinements to the rotor design, the homopolar type permanent magnet motor meets the requirement of the target application.

    DOI: 10.1541/ieejjia.21013346

    Other Link: https://www.jstage.jst.go.jp/article/ieejjia/11/6/11_21013346/_article/-char/en

  • Comparative Study on Insulation Lifetime of Stator Winding of Dual Inverter Fed Open Winding IPMSM and Single Inverter Fed Star-Connected IPMSM for EV Reviewed International journal

    Yuto Maeda, Teppei Hayakawa, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui, Yoichi Miyoshi, Kiyotaka Koga and Subrata Saha

    Proc. of 2022 IEEE Energy Conversion Conference & EXPO(ECCE)   2022.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    In this paper, the winding insulation lifetime of a dual inverter fed open winding interior permanent magnet synchronous motor (OWIPMSM) is compared with a conventional single inverter fed star-connected interior permanent magnet synchronous motor (SCIPMSM) for an EV traction application. A twisted pair coil (TP) is connected between the line-to-line terminal of windings of an OWIPMSM and a SCIPMSM and the effect of the line-to-line terminal surge voltage on the turn-to-turn insulation lifetime using the TP is investigated. From the present preliminary insulation lifetime testing results using the TP, it is found that for motors with the same ratings, an OWIPMSM could be designed with a lower insulation level winding than the SCIPMSM for an EV traction application.

  • New Experimental System and Procedure for On-line Insulation Life Testing of Stator Winding of Automotive Traction PMSM without using Dynamo System Reviewed International journal

    Teppei Hayakawa, Yuto Maeda, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui, Yoichi Miyoshi, Kiyotaka Koga and Subrata Saha

    Proc. of 2022 IEEE Energy Conversion Conference & EXPO(ECCE)   2022.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    This paper proposes an experimental procedure using a new experimental system for on-line insulation turn-to-turn life testing of a stator winding without a rotor of permanent magnet synchronous motor. Without using any expensive large capacity dynamo set-up, the system and procedure make it possible to test the insulation life of the stator winding under steady state operation of the motor even though at high temperatures more than 200 ℃. The line-to-line surge voltage applied to the motor under inverter’s PWM control at running state of the motor can be identically replicated by the proposed
    static system. Suitable control blocks are given to describe the experimental procedure for an automotive traction application.

  • Design Optimization Study on HEFSM with Flat Aspect Ratio for Enhancing Power Density and Efficiency Reviewed

    Takeshi Okada, Mitsuru Saito, Toru Aikoh, Takashi Kosaka, Hiroaki Matsumori, Nobuyuki Matsui

    Proc. of 2022 International Conference on Electrical Machines (ICEM)   122 - 128   2022.09

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    This paper focuses on a hybrid excitation flux switching motor (HEFSM) as one of the variable flux motors for EV/HEV propulsion. HEFSMs have the advantage in that all the active components are concentrated in the stator, which provides ease of cooling, whereas causes the drawback of being likely to occur severe magnetic saturation on the stator side. Therefore, a low L/D ratio, i.e., a flat aspect ratio, was selected, which offers a wide two-dimensional cross-section and mitigation of the magnetic saturation. In this paper, optimization of permanent magnet arrangement and grades under a low L/D ratio is addressed to enhance efficiency and power density over the entire speed range while satisfying design constraints and required performance for EV/HEV propulsion applications. The experimental verification shows that the motor efficiency of the newly designed HEFSM significantly exceeded that of the previously designed one, which reaches over 92% at the frequent operating point.

    DOI: 10.1109/ICEM51905.2022.9910636

    Other Link: https://ieeexplore.ieee.org/document/9910636

  • Comparative Study of High-Current-Density High-Speed Vernier Permanent Magnet Machines for Electric Vehicle Traction Application Reviewed International coauthorship

    Yuting Gao, Takashi Kosaka, Ronghai Qu

    Proc. of 2022 International Conference on Electrical Machines (ICEM)   1899 - 1905   2022.09

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    So far, vernier permanent-magnet machines (VPMs) are mostly applied in natural-cooling slow-speed applications, such as wind power generation, servo system, etc., which are designed with low current density and rotation speed. However, for high current density and rotation speed application, such as electric vehicle (EV) traction, the performances of VPMs are unknown. This paper will validate the feasibility of VPMs in EV traction application, and comparatively study the performances of high-current-density high-speed VPMs at different working conditions. These VPMs share the same stator core and winding, but with different rotor PM configurations, which include surface-mounted, embedded, V-shape and spoke-shape. Besides, the optimal VPM is also compared with a regular interior V-shape PM machine, which is commonly used in EV traction application. It shows that the VPM has higher torque density and efficiency, lower cogging torque and torque ripple than the regular PM machine.

    DOI: 10.1109/ICEM51905.2022.9910876

    Other Link: https://ieeexplore.ieee.org/document/9910876

  • Latest Technical Trend of Miniaturization, Weight Reduction and High Efficiency of Electric Motors by Applying New Topology Reviewed International journal

    Takashi Kosaka, Yoshihiro Miyama, Hajime Ukaji, Kensuke Sasaki, Yuji Yamamoto, Yuichi Yokoi

    Proc. of 2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)   1990 - 1996   2022.05

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:The Institute of Electrical Engineers in Japan  

    This paper reviews latest technical trends of new topologies from the viewpoints of realizing miniaturization, weight reduction and high efficiency for application specific electric motors. The new topologies surveyed are various variable flux machine topologies, machine topology with multiple sets of multi-phase windings, magnetic gears and magnetic geared motors.

    DOI: 10.23919/IPEC-Himeji2022-ECCE53331.2022.9806912

    Other Link: https://ieeexplore.ieee.org/document/9806912

  • A Permanent Magnet Synchronous Machine with Interior Halbach Arrays Reviewed International journal

    Yuting Gao, Takashi Kosaka, Yang Liu, You Zhou

    Proc. of 2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)   1247 - 1252   2022.05

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:The Institute of Electrical Engineers in Japan  

    Regular permanent magnet (PM) synchronous machines with Halbach arrays are mostly surface-mounted, which are only suitable for low-speed applications. In this paper, a PM synchronous machine with interior Halbach arrays is proposed for both low-speed and high-speed operations. The stator core and winding are the same with regular PM machines, while the key difference is the rotor PM structure, i.e. one PM pole is composed of two embedded PMs and a sandwiched spoke PM. The unique rotor configuration offers higher torque density, efficiency, overload and flux weakening capabilities than regular PM machines. Besides, in order to further reduce the torque ripple of the proposed PM machine with interior Halbach arrays, the rotor notching is introduced.

    DOI: 10.23919/IPEC-Himeji2022-ECCE53331.2022.9807194

    Other Link: https://ieeexplore.ieee.org/document/9807194

  • Comparative Analysis of Double Flux Modulation Permanent Magnet Machines with Different Stator PM Arrangements Reviewed International coauthorship International journal

    Yuting Gao, Takashi Kosaka, Yang Liu, Martin Doppelbauer, Ronghai Qu

    IEEE Transactions on Industry Applications   58 ( 2 )   1941 - 1951   2022.03

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE  

    In this article, two double flux modulation permanent-magnet machines (DFMPMs) with PMs on both stator and rotor are introduced. The two DFMPMs share a similar operation principle. However, due to the different stator-PM arrangements, the two DFMPMs show different performances. In order to analyze their performance characteristics, their analytical models are built and verified by finite element analysis (FEA). Moreover, to quantitatively compare their electromagnetic performances more accurately, the two DFMPM topologies are optimized, respectively, and compared in terms of back-EMF, cogging torque,rated torque, torque ripple, power factor, and efficiency. Finally, the DFMPM topology with relatively better performances is built and tested. The experimental results match well with the FEA simulations.

    DOI: 10.1109/TIA.2021.3138838

    Other Link: https://ieeexplore.ieee.org/document/9664008

  • Dual Inverter-fed Open Winding IPMSM Drive System for High-power Premium Class EV Reviewed International journal

    Hiroaki Matsumori, Yuto Maeda, Takashi Kosaka, Nobuyuki Matsui and Subrata Saha

    IEEE Transactions on Industry Applications   2022

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE  

    Recently, the development of a premium class of electric vehicles (EVs) with high-power (250 kW) motor drive systems and high energy/high voltage (100 kWh/800 V) batteries has been the prominent focus of various automotive makers. Considering the drive system efficiency, motor acoustic noise, system fail-safe features, and cost, the dual inverter with a dual battery and an open-winding interior permanent magnet motor is considered to be a highly promising drive system configuration for premium class EVs. Therefore, considering the high drive system efficiency and low motor acoustic noise, the authors propose selecting different pulse width modulation (PWM) switching pattern modes in the frequent vehicle operating area based on the vehicle driving modes for the system configuration of premium class EVs. The authors performed suitable simulations and experiments with a 65kW motor drive system. The experimental results are validated to verify the effectiveness of selecting different PWM switching modes based on the vehicle driving pattern.

  • Isolated AC/DC converter used in EV/PHEV battery charger from household AC outlet Reviewed International journal

    Daisuke Endo, Hiroaki Matsumori, Takashi Kosaka, Sadanori Suzuki and Kenichi Nagayosh

    Proc. of 2022 IEEE Energy Conversion Conference & EXPO(ECCE)   2022.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    This paper presents an isolated AC/DC converter used in a battery charger for EV/PHEV. The converter works for
    EV/PHEV battery charger from a household outlet with AC
    100V/200V to the high voltage main battery with 350V. A typical isolated AC/DC converter consists of a PFC circuit and an isolated DC/DC converter. However, this configuration requires the 12-power semiconductor deceives, which is an obstacle to downsizing, cost reduction, and power conversion efficiency. Therefore, the authors integrate an isolated SEPIC circuit and a totem-pole PFC circuit. The number of power semiconductor devices is reduced from 12 to 6. In this paper, the operating principle of the proposed converter is firstly explained. Then, the circuit operation at 1kW output is verified in the experiment.

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Books and Other Publications

  • 高効率モーター用磁性材料とモーター設計 国立研究開発法人新エネルギー・産業技術総合開発機構(NEDO) 委託事業未来開拓研究プログラム 「次世代自動車向け高効率モーター用磁性材料技術開発」 モーターに関する成果報告

    尾崎 公洋、他( Role: Joint author ,  第4章3節)

    高効率モーター用磁性材料技術研究組合  2020.05 

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    Total pages:118   Responsible for pages:PP.103-110   Language:jpn   Book type:Scholarly book

  • IEEJ Technical Repot No. 1528 Development Trend and Prospect of Elemental Technology for Electric Drive Assited System for Mobility

    Masatsugu Takemoto, et.al.( Role: Joint author ,  Chapter 3 section 2)

    The Institute of Electrical Engineering Japan  2022.05 

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    Total pages:63   Responsible for pages:PP.16-17   Language:jpn   Book type:Report

    This technical report surveys technical trend of electric drive assisted system for mobility toward realize low carbon society. Elemental technologies for mobilities such as automobiles, railway vehicles, construction machineries, vessels and aircraft and inherent technologies behind and materials are surveyed and overviewed. Those technologies are classified from viewpoints of mutual usage of technologies between each mobility.

  • IEEJ Technical Repot No. 1507 Historical Progress and Future Prospect of Technology being Related to Application-specific Electric Motors

    Takashi Kosaka, et.al.( Role: Joint author ,  1st Chapter, 7th Chapter)

    The Institute of Electrical Engineering Japan  2021.02 

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    Total pages:64   Responsible for pages:3-4, 64ページ   Language:jpn   Book type:Report

    In this technical report, historical progress of the application-specific electric motors (ASEM), which specialize in motor structures or mechanisms for the machine or mechanism of the target applications to satisfy application-specific requirements, surveyed by the R&D committee is overviewed. Furthermore, with rare earth free or less rare earth and variable magnetic force as keywords, peculiar motors expected as candidates for next generation's ASEM are presented in addition with magnetic materials and inverter technologies supporting them.

  • IEEJ Technical Repot No. 1492 Technical Trend of Next-generation Application Specific Electric Motors and Electromechanical Integration TechnologyElectric Drive Assisted System for Mobility toward Creating Sustainable Society

    Yoshiaki Kano, et.al.( Role: Joint author ,  3rd Chapter, Section 3.4)

    The Institute of Electrical Engineering Japan  2020.08 

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    Total pages:56   Responsible for pages:21-23ページ   Language:jpn   Book type:Report

    Application-specific electric motors (ASEMs) have been widely utilized in a variety of variable-speed motor drive applications, such as factory automation, home appliances, and automobiles. In these applications, reluctance torque assisted permanent magnet (PM) motors represented by interior PM motors achieve high levels of resource and energy savings using electromechanical integration technology. The committee performed an extensive survey on the electromechanical integration technology for each application. This technical report covers the following topics. Technical trends of electromechanical integration technology in traction drives and auxiliary motors for automobiles as well as home and consumer appliances. Component technologies supporting ASEMs.

  • Technical Trend of Electric Drive Assisted System for Mobility toward Creating Sustainable Society

    Takashi Kosaka, et.al.( Role: Joint author ,  1st Chapter, 7th Chapter)

    The Institute of Electrical Engineering Japan  2019.02 

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    Total pages:73   Responsible for pages:3-4ページ,73ページ   Language:jpn   Book type:Report

    This technical report surveys technical trends of electric drive assisted system for Mobility toward creating sustainable society. Recent electrifications introduced to railway vehicles, construction machineries, vessels, aircrafts and automobiles have been reviewed. For each electric drive assisted system employed in each mobility, the survey has been made from viewpoints of inherent feature to be considered, the system configuration corresponding to the inherent feature and the technology behind.

  • Next-Generation Application-Specific Electric Motors and Component Technology

    Yuji Enomoto, et.al.( Role: Contributor ,  2.2.6 Hybrid Excitation Motor (Permanent Magnet on Stator))

    The institute of Electrical Engineers in Japan  2017.08 

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    Total pages:66   Responsible for pages:13-15   Language:jpn   Book type:Report

    Application Specific Electric Motor was defined as "motor based on the structure of the motor and a way of the so-called "hardware" like approach by which an organization changes itself and achieves component performance of a machine or an organization" in around 1994. Today Reluctance torque assisted motors represented by IPMSM are the effective means of reducing global warming ,while applying expansion of it to the motor for driving of household electrical appliance, an electric car and a hybrid car of room air -conditioning is advancing. Meanwhile, The Inst. of Electrical Engineers in Japan has done the investigation of the research and development of motors such as the motor efficiency improvements and the rare earth reductions. Main investigation ad hoc committee expanded the investigation area and investigated about the variable magnetic flux to expand the rated performance of the motor and the driving range and technology of using three-dimensional space. Moreover it can report that investigated about necessary peripheral technology to compose a high performance motor. This technical report shows the result of the next-generation motor which makes the directionality of future's motor development clear, and of the support component technology development trend.

  • A Technology Trend of Electric Motors for EV/HEV

    Nobuyuki Matsui, Kan Akatsu et.al.( Role: Contributor ,  General Remarks)

    The Institute of Electrical Engineers in Japan  2017.05 

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    Total pages:55   Responsible for pages:3-4   Language:jpn   Book type:Report

    Application Specific Electric Motor was defined as "motor based on the structure of the motor and a way of the so-called "hardware" like approach by which an organization changes itself and achieves component performance of a machine or an organization" in around 1994. Today Reluctance torque assisted motors represented by IPMSM are the effective means of reducing global warming ,while applying expansion of it to the motor for driving of household electrical appliance, an electric car and a hybrid car of room air -conditioning is advancing. Meanwhile, The Inst. of Electrical Engineers in Japan has done the investigation of the research and development of motors such as the motor efficiency improvements and the rare earth reductions. Main investigation ad hoc committee expanded the investigation area and investigated about the variable magnetic flux to expand the rated performance of the motor and the driving range and technology of using three-dimensional space. Moreover it can report that investigated about necessary peripheral technology to compose a high performance motor. This technical report shows the result of the next-generation motor which makes the directionality of future's motor development clear, and of the support component technology development trend.

  • Reluctance Torque Assisted Motors

    Masayuki Morimoto, Takashi Kosaka, et.al( Role: Joint author ,  Chapter 2 Section 4, Chapter 7)

    The Institute of Electrical Engineers of Japan  2016.01  ( ISBN:978-4-88686-299-0

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  • Less Rare-Earth and Rare-Earth Free Motors

    Nobuyuki Matsui, Takashi Kosaka, et.al.( Role: Joint author)

    THE NIKKAN KOGYO SHIMBUN. LTD  2013.12  ( ISBN:978-4-526-07171-3

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    Language:jpn   Book type:Scholarly book

  • Latest Trends of Technologies and Applications of Permanent Magnet Synchronous Machines

    Akio Toba, Takashi Kosaka, etc.( Role: Joint author)

    The Institute of Electrical Engineering Japan  2013.05 

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    Language:jpn   Book type:Report

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Misc

  • Trends in Traction Motor for Automobile ~ Efforts of NITech at MagHEM ~ Invited

    Takashi Kosaka

    Technical Review of Tamagawa   2021.12

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (other)   Publisher:TAMAGAWA SEIKI Co.,Ltd.  

  • Noise and Vibration Reduction in SR Motor Invited

    Takashi Kosaka

    The Journal of The Institute of Electrical Engineers of Japan   137 ( 12 )   825 - 828   2017.12

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:The Institute of Electrical Engineers of Japan  

    Other Link: https://www.jstage.jst.go.jp/browse/ieejjournal/-char/ja/

  • Technical Trend in Motor s for xEV Electrical Propulsion Invited

    Takashi Kosaka

    Die and Mould Technology   33 ( 1 )   2017.12

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:THE NIKKAN KOGYO SHIMBUN,LTD  

    Other Link: http://pub.nikkan.co.jp/magazine_series/detail/0005

  • Introduction of Researches and Deveploments on Motors as Electric Machines Invited

    Takashi Kosaka

    ( 360 )   2 - 4   2016.10

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    Authorship:Lead author   Language:Japanese   Publishing type:Rapid communication, short report, research note, etc. (bulletin of university, research institution)   Publisher:The Japan Research and Development Center for Metals  

  • Latest Technologies of SR Motos, PM Motors and Variable Magnetization Motors for Three Major Domestic Appliances Invited

    Takashi Kosaka

    Transistor Gijutsu   52 ( 12 )   131 - 136   2015.12

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:CQ Publishing Co.,Ltd.  

    Other Link: http://www.cqpub.co.jp/hanbai/books/MTR/MTR201512.htm

Presentations

  • Hybrid Excitation Flux Switching Motor Invited

    Takashi Kosaka

    2022.06  NEDO

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    Event date: 2022.06

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:Online   Country:Japan  

  • Latest Technical Trend of Miniaturization, Weight Reduction, and High Efficiency of Electric Motors by Increasing the Rotational Speed Invited International conference

    Takashi Kosaka

    2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)  2022.05  The Institute of Electrical Engineering of Japan

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    Event date: 2022.05

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Himeji City Culture and Convention Center (Arcrea HIMEJI)   Country:Japan  

    DOI: 10.23919/IPEC-Himeji2022-ECCE53331.2022.9806986

  • Hybrid Excitation Flux Switching Motor Employing Variably Magnetizable Permanent Magnet ~Touching the Best Paper Awards (First Place) of the IEMDC2021 ~ Invited

    Takashi Kosaka

    Technical Meeting on "Rotating Machinery", IEE Japan  The Institute of Electrical Engineering of Japan

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:Online  

  • R&D on Hybrid Excitation Motors for Electrified Vehicle Traction Drive under MagHEM Project Invited International conference

    Takashi Kosaka

    2021 International Conference on Electric Machines and Systems  The Koran Institute of Electrical Engineers

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    Event date: 2021.10 - 2021.11

    Language:English   Presentation type:Oral presentation (keynote)  

    Venue:Gyeongju, Korea  

    To develop high performance magnetic materials in pursuit high efficiency motor, the future pioneering program “Development of Magnetic Material Technology for High-efficiency Motors” commissioned by the New Energy and Industrial Technology Development Organization (NEDO) has been launched in Japan since 2012. Technology research association of magnetic materials for high-efficiency motors (MagHEM) has been organized to proceed various R&D projects. As one of R&D projects, various types of hybrid excitation motors employing new magnet materials for electrified vehicle traction drive has been pursued by our research group in Nagoya Institute of Technology for a last decade. In this keynote lecture, historical progress in R&D of hybrid excitation motors as a possible candidate of high efficiency motor for vehicle propulsion is presented.

  • 機械式可変磁束機構による可変磁束SPMSM Invited

    小坂 卓

    テクノフロンティア2022 第42回モータ技術シンポジウム  2022.08  日本能率協会

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    Event date: 2022.08

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:オンライン   Country:Japan  

  • Design Study on HEFSM Employing Variably Magnetizable PM for Improving Torque Density and Efficiency Based on Optimizations of Aspect Ratio and PM Arrangement

    Mitsuru Saito, Takeshi Okada, Takashi Kosaka, Hiroaki Matsumori, Nobuyuki Matsui

    Technical Meeting on "Rotating Machinery", IEE Japan  The Institute of Electrical Engineering of Japan

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Online  

  • Design Study on Operating Range Extension and Cogging Torque Reduction of Variable Flux SPMSM based on Mechanical Stator Mover System for the Eco-Car Race

    Kako Yamahata, Takeshi Okada, Takashi Kosaka, Hiroaki Matsumori, Nobuyuki Matsui, Hiroshi Kaneshige

    Technical Meeting on "Rotating Machinery", IEE Japan  The Institute of Electrical Engineering of Japan

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Online  

  • Basic study on a novel AC/DC converter

    Daisuke Endo, Hiroaki Matsumori, Takashi Kosaka, Sadanori Suzuki, Kenichi Nakata

    Joint Technical Meeting on "Semiconductor Power Convertor" and "WQ Motor Drive", IEE Japan  The Institute of Electrical Engineering of Japan

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    Event date: 2021.09

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Tojo Pearl Building 8F, Kawagoe  

  • Design Study on Operating Range Extension of Variable Flux SPMSM Employing Adjustable Airgap Structure Based on Mechanical Stator Mover System for Ene-1 Challenge

    Kako Yamahata, Takeshi Okada, Takashi Kosaka, Hiroaki Matsumori, Hiroshi Kaneshige

    2021 IEE-Japan Industry Applications Society Conference  The Institute of Electrical Engineering of Japan

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    Event date: 2021.08

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Hotel New Otani Nagaoka  

  • Study on PWM Carrier Loss Evaluation Model for Claw Pole Type Motor

    Haruki Tsukano, kazuya Ikuta, Takashi Kosaka, Hiroaki Matsumori, Nobuyuki Matsui, Yuki Hidaka, Yu Hirai, Hidetaka Arita, Masahiko Fujita, Toshiyuki Yoshizawa

    Joint Technical Meeting on "Motor Drive", "Rotating Machinery" and "Vehicle Technology", IEE Japan  The Institute of Electrical Engineering of Japan

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    Event date: 2021.06

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Online  

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Industrial Property Rights

  • Motor

    Takashi Kosaka, Yoshiaki Kano, Yoshihisa Hojo

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    Applicant:TOYO DENKI SEIZO K.K., Nagoya Institute of Technology

    Application no:特願2018-058261  Date applied:2018.03

    Announcement no:2019-170128  Date announced:2019.10

    Country of applicant:Domestic   Country of acquisition:Domestic

  • Rotating Electric Machine

    Yoshinari Asano, Takashi Kosaka

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    Applicant: DAIKIN INDUSTRIES, LTD., Nagoya Institute of Technology

    Application no:2016-166428  Date applied:2016.08

    Announcement no:2017-63597  Date announced:2017.03

    Patent/Registration no:6139007  Date registered:2017.05  Date issued:2017.05

    Country of applicant:Domestic   Country of acquisition:Domestic

  • Rotating Electric Machine

    Yoshinari Asano, Takashi Kosaka

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    Applicant:DAIKIN INDUSTRIES, LTD., Nagoya Institute of Technology

    Application no:2016325752  Date applied:2016.08

    Patent/Registration no:AU2016325752  Date registered:2019.06  Date issued:2019.06

    Country of applicant:Foreign country   Country of acquisition:Foreign country

    【技術課題】従来型の磁石内側配置型HEFSM(1)では,増磁制御時に界磁巻線起磁力が永久磁石に対して逆磁界として働く。そのため,高保磁力磁石が必要となり,Dy 添加量の点で難を有する。これに対し,磁石外側配置型HEFSM(2)では,前述の関係が逆転し,低保磁力磁石の使用が可能となるが,最大トルク・効率の低下が問題となる。このことは文献(3)で既に報告したように,磁石外側配置型HEFSM では永久磁石磁束がトルク発生に寄与しにくいことが一因であり,改善策として界磁巻線スロットバックヨーク部の磁気抵抗増加を提案している。以上から,Dy 添加量低減と高効率化の両立のためには,永久磁石への逆磁界を生じず,同バックヨーク部の磁気抵抗を高くできる構造とすればよいことが示唆される。
     【解決手段】界磁巻線を磁石の上下に分配
    した磁石中央配置型HEFSM を提案する。界磁巻線非通電時には同図(a)のように磁石磁束は固定子内で短絡して低ギャップ磁束密度に,界磁巻線増磁制御時は同図(b)のように磁束経路が形成され,磁石磁束に界磁巻線磁束が重畳し,高ギャップ磁束密度化を図れる。本構造により,磁石に対する上下の界磁巻線起磁力が打ち消しあうのに加え,界磁スロットバックヨークの磁気抵抗増加が可能となる。

  • Electric Motor

    Yoshinari Asano, Takashi Kosaka

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    Applicant:Daikin Industries Ltd., Nagoya Institute of Technology

    Application no:15/500014  Date applied:2015.06

    Patent/Registration no:10348174  Date registered:2019.07  Date issued:2019.07

    Country of applicant:Foreign country   Country of acquisition:Foreign country

    An electric motor includes a rotor and a stator including a stator core, a plurality of armature windings, a plurality of field windings, and a plurality of bonded magnets. The stator core has a plurality of teeth alternately defining field slots and armature slots along a circumferential direction, and a stator yoke magnetically coupling the plurality of teeth opposite the rotor. Each armature winding is wound around two of the teeth sandwiched between an adjacent pair of the armature slots. Each field winding is wound around two of the teeth sandwiched between an adjacent pair of the fieldslots. The magnets are individually located in the field slotswhile opposing the field windings in the radial direction. Each adjacent pair of the magnets along the circumferential direction respectively has an adjacent pair of pole surfaces,with the adjacent pair of pole surfaces having a same polarity.

  • Control Unit of Switched Reluctance Motors

    Hiroshi Shimada, Takashi Kosaka

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    Applicant:Fuji Electric Co., Ltd.

    Application no:2012-185300  Date applied:2012.08

    Announcement no:2014-14552  Date announced:2014.03

    Patent/Registration no:6069953  Date registered:2017.01  Date issued:2017.01

    Country of applicant:Domestic   Country of acquisition:Domestic

  • Rotating Machine

    Yoshinobu Kamada, Masami Fujitsuna, Hiroaki Kajiura, Takashi Kosaka, Takafumi Matsumoto, Nobuyuki Matsui

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    Application no:2012-69859  Date applied:2012.03

    Announcement no:2013-201869  Date announced:2013.10

    Patent/Registration no:5798072  Date registered:2015.08  Date issued:2015.08

    Country of applicant:Domestic   Country of acquisition:Domestic

  • Rotating Electric Machine

    Kazuki Tonogi, Toshihiko Yoshida, Norimoto Minoshima, Nobuyuki Matsui, Takashi Kosaka, et.al.

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    Application no:13/407472  Date applied:2012.02

    Patent/Registration no:9083225  Date registered:2015.07  Date issued:2015.07

    Country of applicant:Foreign country   Country of acquisition:Foreign country

  • Rotating Electric Machine

    Kazuki Tonogi, Toshihiko Yoshida, Norimoto Minoshima, Nobuyuki Matsui, Takashi Kosaka, et.al.

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    Application no:201210047825.X  Date applied:2012.02

    Patent/Registration no:ZL201210047825.X  Date registered:2014.11  Date issued:2014.11

    Country of applicant:Foreign country   Country of acquisition:Foreign country

  • Rotating Machine

    Kaoru Yoshikawa, Kasuki Tonogi, Nobuyuki Matsui, Takashi Kosaka

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    Application no:2012-3336  Date applied:2012.01

    Announcement no:2013-14386  Date announced:2013.07

    Country of applicant:Domestic   Country of acquisition:Domestic

  • Motor Drive Unit and Vehicle Mounting It

    Nobuyuki Matsui, Eiji Yamada, Ryoji Mizutani, Takashi Kosaka

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    Application no:201110083298.3  Date applied:2011.04

    Patent/Registration no:ZL201110083298.3  Date registered:2014.02  Date issued:2014.02

    Country of applicant:Foreign country   Country of acquisition:Foreign country

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Awards

  • Excellent Technical Activity Award Group Writing Award

    2019.05   The Institute of Electrical Engineers of Japan   Reluctance Torque Assisted Motors

    Technical Committee on Technologies of Reluctance Torque Assisted Motors

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  • Best Paper Award (The First Prize) in the 20th International Conference on Electric Machines and Systems (ICEMS2017)

    2017.08   The 20th International Conference on Electric Machines and Systems (ICEMS2017)   Study on Commutation Control Method for Reducing Noise and Vibration in SRM

    Sungyong Shin, Naoki Kawagoe, Takashi Kosaka and Nobuyuki Matsui

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    Award type:Award from international society, conference, symposium, etc.  Country:Australia

    In order to reduce noise and vibration in switched reluctance motors (SRM), many kinds of commutation methods have been proposed. One of them is well-known as 2-stage commutation method. However, it has a defect which is revealed particularly when SRM is operated at high speed and high load condition. In this study, through the magnetic-structural coupled analysis using FEM and the mathematical analysis of exciting force in 4-phase 8/6 SRM, the reason why vibration reduction based on the 2-stage commutation does not work is investigated. According to the investigations, a modified method to reduce vibration and noise independent from operating condition is proposed.

  • 中部経済産業局感謝状

    2012.12   中部経済産業局  

    小坂 卓

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    Country:Japan

  • 第30回永井奨励賞

    2013.03   公益財団法人永井科学技術財団  

    小坂 卓

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    Award type:Award from publisher, newspaper, foundation, etc.  Country:Japan

  • First Paper Prize Award of the 2010 International Power Electric Conference

    2010.06   電気学会産業応用部門  

    Takashi Kosaka, Takaaki Hirose, Nobuyuki Matsui

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  • 電気学会学術振興賞進歩賞

    2009.05   電気学会  

    松井信行, 小坂卓, 青木康明

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  • Committee Prize Paper Award (Third Prize), The Electric Machine Committee of the IEEE Industry Applications Society

    2007.12  

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    Award type:Award from international society, conference, symposium, etc.  Country:United States

  • 技術部門貢献賞

    2016.08   公益社団法人 自動車技術会  

    小坂 卓

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    Country:Japan

    技術会議モータ技術部門委員会への多大なる貢献

  • Outstanding Paper Award, Internationa Conference on Electric Machine and Systems

    2007.04  

  • 平成19年度電気学会全国大会優秀論文発表賞

    2007.04   -  

    -

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    Country:Japan

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Committee Memberships

  • 電気学会   電気学会東海支部活動推進員  

    2010.04   

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    Committee type:Academic society

  • 電気学会   自動車技術委員会1号委員  

    2010.04   

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    Committee type:Academic society

  • パワーエレクトロニクス学会   評議員  

    2001.04   

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    Committee type:Academic society