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電気・機械工学科 電気電子分野
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KOSAKA Takashi
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Degree
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Master (Engineering) ( Nagoya Institute of Technology )
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Doctor (Engineering) ( Nagoya Institute of Technology )
Research Areas
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Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Control and system engineering
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Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Power engineering
From School
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Nagoya Institute of Technology Faculty of Engineering Department of electrical and computer engineering Graduated
- 1994.03
Country：Japan
From Graduate School
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Nagoya Institute of Technology Graduate School, Division of Engineering Department of electrical and computer engineering Doctor's Course Completed
- 1999.03
Country：Japan
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Nagoya Institute of Technology Graduate School, Division of Engineering Department of electrical and computer engineering Master's Course Completed
- 1996.03
Country：Japan
External Career
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Faculty of Engieering, University of Leicester, United Kingdom, Studies on Computer Aided Optimum Design for Application Specific Electric Motors
2002.11 - 2004.10
Country：United Kingdom
Professional Memberships
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IEEE(Institute of Electrical and Electronic Engineers)
2003.10
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The Institute of Electrical Engineers of Japan
1994.07
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The Japna Institute of Power Electronics
2001.04
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The Insititute of Electrical Installation Engineers of Japan
2009.10
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科学技術交流財団
2005.04
Research Career
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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
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
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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
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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
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Issues and Solutions for a GaN Based Modified Non-Isolated Integrated On-Board Charger Configuration Using Traction Motor Reviewed International journal
Kazuki Toda, Shohei Funatsu, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui, Keisuke Nakamura, Keisuke Ushida, Yutaka Hotta, Subrata Saha
Proc. of 2024 IEEE Energy Conversion Conference & EXPO(ECCE2024) 1 - 5 2024.10
Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE
In this paper, major issues and solutions of a GaN based modified non-isolated integrated on-board charger
(IOBC) using a low value zero sequence inductance of traction motor and an inverter for class A and B segment electric vehicles (EV's) with dual power conversion stages are discussed. The major issues of cost and volume due to the presence of a high value of dc-link capacitor and an extra high current contactor
in the IOBC are highlighted and feasible hardware and control solutions are proposed. Another major issue concerning the safety issue of a non-isolated IOBC due to the presence of ground leakage current above the permissible standard limit is also brought out and feasible hardware solutions are proposed. The solutions to the issues of the modified IOBC configuration are verified from suitable simulation and experimental results. -
Design Optimization of Hybrid Excitation Flux Switching Generator for Micro Hydroelectric System Reviewed International journal
Yasushi Kato, Reo Nagase, Naoki Yamamoto, Yoshiki Yasuda, Akio Yamagiwa and Takashi Kosaka
Proc. of 2024 International Conference on Electrical Machines (ICEM) 1 - 6 2024.09
Authorship：Corresponding author Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE
This paper presents a design study of a hybrid excitation flux switching generator (HEFSG) for micro hydroelectric power generation system installed in water supply facilities as a kind of renewable energy systems. Interior permanent magnet synchronous generators installed in current micro hydroelectric power generation systems may lack the power generation range in the low-speed and high-torque range, depending on the location and conditions where the systems are installed, resulting in the loss of power generation opportunities. In this research and development, HEFSG as a kind of variable flux machines is applied with the aim of realizing a micro hydroelectric power generation system that can be used in various occasions and conditions. Application-oriented optimum design of HEFSG under given design constraint and specifications using finite element electromagnetic analysis is conducted. The design results show that the designed HEFSG can expand the high torque operating range in low-speed region that meets for the target requirement.
DOI： 10.1109/ICEM60801.2024.10700137
DOI： 10.1109/ICEM60801.2024.10700137
Other Link： https://xplorestaging.ieee.org/document/10700137
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Comparative Study on Insulation Lifetime of Stator Winding of Dual Inverter Fed Open Winding IPMSM and Single Inverter Fed Star-Connected IPMSM for EV Application Reviewed
Teppei Hayakawa, Yuto Maeda, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui, Yoichi Miyoshi, Kiyotaka Koga and Subrata Saha
IEEE Transactions on Industry Applications 60 ( 5 ) 6886 - 6898 2024.07
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
In this paper, the turn-to-turn 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 via an on-line experiment. A twisted pair coil (TP) is connected between the line-to-line terminal of windings of an OWIPMSM and a SCIPMSM without rotor and the effect of the line-to-line terminal surge voltage on the turn-to-turn insulation lifetime using the TP is investigated by generating PWM pulses at the inverter output identical to a variable load traction inverter drive. The turn-to-turn insulation life of the TP windings is approximately estimated by measuring the capacitance of the TP windings at regular time intervals during the on-line testing. Finally, experiment is carried out to detect the partial discharge in the TP windings and understand the physical relationship that exists between the total partial discharge count number and the decrease in capacitance of the TP windings after a specified time-period of insulation life testing. 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.
Other Link： https://ieeexplore.ieee.org/document/10596934/
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Design for Improving Drive Performances of Variable Flux SPMSM for Eco-Car Race Employing Mechanical Stator Mover System Reviewed
Kako Yamahata, Takashi Kosaka, Takeshi Okada, Hiroaki Matsumori and Hiroshi Kaneshige
IEEJ Transactions on Industry Applications 144 ( 7 ) 548 - 556 2024.07
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
This paper presents a design study on improving the operating range and lowering the cogging torque for a variable flux surface-mounted permanent magnet motor (VFSPMSM) with a variable airgap structure employing a mechanical stator mover system for the eco-car race called Ene-1 Challenge. Eco-car race application requires designing a traction motor with a wider operating range and higher efficiency under given battery voltage and current regulations. To real
ize these requirements, the VFSPMSM can change the back-emf constant based on the motor speed by adjusting only the axial alignment between stator and rotor appropriately based on the mechanical stator mover system, resulting in a wider operating speed range without field weakening control. Additionally, it is essential to achieve the lowest cogging torque possible to ensure driving comfort. The design procedure of a VFSPMSM for operating range expansion is examined based on the problems found in the previously designed motor. Finite element method-based design and simulation and experimental drive performance evaluation results of the designed VFSPMSM without field wakening show an extended operating range, improved motor efficiency and minimized cogging torque.DOI： https://doi.org/10.1541/ieejias.144.548
DOI： https://doi.org/10.1541/ieejias.144.548
Other Link： https://www.jstage.jst.go.jp/article/ieejias/144/7/144_548/_article/-char/ja
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Design study on hybrid excitation flux switching motor for electric taxiing system in aircraft Reviewed International coauthorship International journal
Yugo Hara, David Gerada and Takashi Kosaka
Proc. of 13th International Conference on Power Electronics, Machines and Drives (PEMD 2024) 1 - 6 2024.06
Authorship：Corresponding author Language：English Publishing type：Research paper (international conference proceedings) Publisher：IET
This paper presents an electric motor design for an electric taxiing system in aircraft. Electric motors for the electric taxiing system require high power density and high mechanical robustness of rotor. A hybrid excitation flux switching motor as a kind of variable flux motors is a good candidate because all active components such as permanent magnets and windings are located on the stator body essentially suitable for high speed rotation. An optimum design study on hybrid excitation flux switching motor is conducted based on finite element analysis using multi-objective genetic algorithm. For the design study, aluminum conductors for windings are introduced and a use of local non-magnetization technique for rotor electrical steel sheets are assumed to improve the power density and the rotor mechanical strength. Besides, the iron loss of rotor made of high-tensile electrical steel sheets is evaluated because an increase in iron loss is one of concerns with the high-tensile electrical steel sheets. The optimum design results based on finite element analysis show that both the power density with reduced rotor weight and the rotor mechanical stress using locally non-magnetized rotor high-tensile electrical steel sheets meet for the requirements.
Other Link： https://xplorestaging.ieee.org/document/10663610
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New Experimental System and Procedure for On-Line Insulation Life Testing of Stator Winding of Automotive Traction PMSM without using Dynamo System Reviewed
Teppei Hayakawa, Yuto Maeda, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui, Yoichi Miyoshi, Kiyotaka Koga and Subrata Saha
IEEE Transactions on Industry Applications 60 ( 5 ) 6684 - 6693 2024.05
Language：English Publishing type：Research paper (scientific journal) 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 a permanent magnet synchronous motor. Without using any expensive large capacity dynamo set-up, the proposed 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 of more than 200 °C. The line-to-line surge voltage applied to the motor under the inverter's PWM control at the running state of the motor is successfully replicated by the proposed static system. Suitable control blocks are given to describe the experimental procedure for an automotive traction application. In the new experimental set-up, a twisted pair (TP) winding is connected between the U-V phase of the stator phase windings. The turn-to-turn insulation life of the TP windings is approximately estimated by measuring the capacitance of the TP windings at regular time intervals during the on-line testing. Finally, an experiment is carried out to detect the partial discharge in the TP windings and understand the physical relationship that exists between the total partial discharge count number and the decrease in capacitance of the TP windings after a specified time-period of insulation life testing.
Other Link： https://ieeexplore.ieee.org/document/10536604
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GaN Based Modified Integrated On-Board Charger Configuration Using Minimum Additional Active and Passive Components Reviewed
Shohei Funatsu, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui, Keisuke Nakamura, Mitsuru Takahashi, Shin Taguchi and Saha Subrata
Proc. of 2023 IEEE Energy Conversion Conference & EXPO(ECCE2023) 1976 - 1981 2023.10
Language：English Publishing type：Research paper (international conference proceedings)
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Alternative PWM Switching Strategy Implementation for a Dual Inverter Fed Open Winding Motor Drive System for an Electric Vehicle Application Reviewed
Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui and Subrata Saha
IEEE Transactions on Industry Applications 59 ( 5 ) 5957 - 5970 2023.07
Language：English Publishing type：Research paper (scientific journal)
Other Link： https://ieeexplore.ieee.org/abstract/document/10171394
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Study on Electric Motor Vibration Suppression by Active Dynamic Vibration Absorber Reviewed International coauthorship
Takeshi Okada, Makoto Isobe, Takashi Kosaka, Paul Steinmann, Hiroaki Matsumori and Nobuyuki Matsui
Proc. of 2023 IEEE International Electric Machines & Drives Conference (IEMDC) 2023.05
Authorship：Corresponding author Language：English Publishing type：Research paper (international conference proceedings)
DOI： 10.1109/IEMDC55163.2023.10238866
DOI： 10.1109/IEMDC55163.2023.10238866
Other Link： https://ieeexplore.ieee.org/document/10238866
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Design Study on Light-weight Quasi-coreless SPMSM using CFRP, Small Amount of SMC Core and Aluminum Winding Reviewed
Takashi Kosaka, Chika Higashihama, Teruchika Ishihara, Hiroaki Matsumori and Nobuyuki Matsui
Proc. of 2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia) 2338 - 2343 2023.05
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (international conference proceedings)
DOI： 10.23919/ICPE2023-ECCEAsia54778.2023.10213851
DOI： 10.23919/ICPE2023-ECCEAsia54778.2023.10213851
Other Link： https://ieeexplore.ieee.org/document/10213851/authors#authors
Books and Other Publications
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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
Total pages：118 Responsible for pages：PP.103-110 Language：jpn Book type：Scholarly book
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Yoshinari Asano, Takashi Kosaka, et.al.（ Role： Joint author , Chapter 4, Section 2, Subsection 3 (4.2.3) ）
The Institute of Electrical Engineering Japan 2023.12
Total pages：58 Responsible for pages：26-27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.
Other Link： https://www.bookpark.ne.jp/cm/ieej/detail/IEEJ-GH1564-PDF/
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Masatsugu Takemoto, et.al.（ Role： Joint author , Chapter 3 section 2）
The Institute of Electrical Engineering Japan 2022.05
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.
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Takashi Kosaka, et.al.（ Role： Joint author , 1st Chapter, 7th Chapter）
The Institute of Electrical Engineering Japan 2021.02
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.
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Yoshiaki Kano, et.al.（ Role： Joint author , 3rd Chapter, Section 3.4）
The Institute of Electrical Engineering Japan 2020.08
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.
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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
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.
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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
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.
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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
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.
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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 ）
Total pages：212 Responsible for pages：44-49, 152-188 Language：jpn Book type：Scholarly book
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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 ）
Language：jpn Book type：Scholarly book
Misc
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Trends in Traction Motor for Automobile ~ Efforts of NITech at MagHEM ~ Invited
Takashi Kosaka
Technical Review of Tamagawa 2021.12
Authorship：Lead author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (other) Publisher：TAMAGAWA SEIKI Co.,Ltd.
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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
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/
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Technical Trend in Motor s for xEV Electrical Propulsion Invited
Takashi Kosaka
Die and Mould Technology 33 ( 1 ) 2017.12
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
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Introduction of Researches and Deveploments on Motors as Electric Machines Invited
Takashi Kosaka
( 360 ) 2 - 4 2016.10
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
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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
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
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Design Optimization of Hybrid Excitation Flux Switching Generator for Micro Hydroelectric System International conference
Yasushi Kato
2024 International Conference on Electrical Machines (ICEM) 2024.09 IEEE (Institute of Electrical and Electronics Engineers)
Event date： 2024.09
Language：English Presentation type：Oral presentation (general)
Venue：Politecnico di Torino, Torino, Italy Country：Italy
This paper presents a design study of a hybrid excitation flux switching generator (HEFSG) for micro hydroelectric power generation system installed in water supply facilities as a kind of renewable energy systems. Interior permanent magnet synchronous generators installed in current micro hydroelectric power generation systems may lack the power generation range in the low-speed and high-torque range, depending on the location and conditions where the systems are installed, resulting in the loss of power generation opportunities. In this research and development, HEFSG as a kind of variable flux machines is applied with the aim of realizing a micro hydroelectric power generation system that can be used in various occasions and conditions. Application-oriented optimum design of HEFSG under given design constraint and specifications using finite element electromagnetic analysis is conducted. The design results show that the designed HEFSG can expand the high torque operating range in low-speed region that meets for the target requirement.
DOI： 10.1109/ICEM60801.2024.10700137
Other Link： https://xplorestaging.ieee.org/document/10700137
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GaN Based Modified Integrated On-Board Charger Configuration Using Minimum Additional Active and Passive Components International conference
Shohei Funatsu
2023 IEEE Energy Conversion Conference & EXPO (ECCE2023) 2023.10 Institute of Electrical and Electronics Engineers
Event date： 2023.10 - 2023.11
Language：English Presentation type：Poster presentation
Venue：Nashvilee, TN, USA Country：United States
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Design Study on Light-weight Quasi-coreless SPMSM using CFRP, Small Amount of SMC Core and Aluminum Winding International conference
Teruchika Ishihara
2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia) 2023.05 Korean Institute of Power Electronics
Event date： 2023.05
Language：English Presentation type：Poster presentation
Venue：Jeju, Korea Country：Korea, Republic of
DOI： 10.23919/ICPE2023-ECCEAsia54778.2023.10213851
Other Link： https://ieeexplore.ieee.org/document/10213851/authors#authors
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Study on Electric Motor Vibration Suppression by Active Dynamic Vibration Absorber International coauthorship International conference
Takashi Kosaka
2023 IEEE International Electric Machines & Drives Conference (IEMDC) 2023.05 Institute of Electrical and Electronics Engineers
Event date： 2023.05
Language：English Presentation type：Oral presentation (general)
Venue：San Francisco, CA, USA Country：Japan
DOI： 10.1109/IEMDC55163.2023.10238866
Other Link： https://ieeexplore.ieee.org/document/10238866
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Variable Flux Motor (Hybrid Excitation Flux Switching Motor)
Takashi Kosaka
The 2023 Annual Meeting IEE of Japan 2023.03 The Institute of Electrical Engineering of Japan
Event date： 2023.03
Language：Japanese Presentation type：Symposium, workshop panel (nominated)
Venue：Nagoya University Country：Japan
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Design Study on Hybrid Excitation Generator for Micro-hydroelectric System International conference
Kazuto Maruyama
27th International Conference on Electrical Machines and Systems (ICEMS2024) 2024.11 The Institute of Electrical Engineering of Japan
Event date： 2024.11
Language：English Presentation type：Poster presentation
Venue：Fukuoka Institute of Technology, Fukuoka, Japan Country：Japan
This paper presents design study on a hybrid excitation machine as a generator for a micro-hydroelectric system. A hybrid excitation generator is a kind of variable flux machines and has two mmf sources such as a permanent magnet and the field excitation coil that enables to adjust a total amount of airgap field flux produced by two mmf sources. With the variable field flux capability, a hybrid excitation generator promises to expand high torque oper-ating range at low speed region while keeping operating power range at middle and high-speed region as required in the target application under given maximum voltage and current restrictions. Application-oriented design of hybrid excitation generator under given design constraints and specifications using finite element electromagnetic analysis is conducted. As a result, it is confirmed that the designed hybrid excitation generator meets the requirement for a target micro-hydroelectric system.
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Design Study on High Power Density Quasi-Coreless PMSM for Vehicle Traction Drive Rotating at 50,000r/min as the Maximum Speed International conference
Teruchika Ishihara
27th International Conference on Electrical Machines and Systems (ICEMS2024) 2024.11 The Institute of Electrical Engineering of Japan
Event date： 2024.11
Language：English Presentation type：Oral presentation (general)
Venue：Fukuoka Institute of Technology, Fukuoka, Japan Country：Japan
This paper presents a design study on high-power density quasi-coreless permanent magnet synchronous motor for vehicle traction drives rotating at 50,000r/min as the maximum speed. Stator body is composed of carbon fiber rein-forced plastic, a small amount of soft magnetic composite core and aluminum windings. Rotor body consists of car-bon fiber reinforced plastic frame and polar anisotropic magnet. FEA-base feasibility study on the quasi-coreless motor with high power density and reduced losses are investigated, targeting the maximum speed of 50,000 r/min, the maximum power of 150 kW and the power density more than 10 kW/kg.
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Modelling for PWM Carrier Loss Evaluation in Claw-pole Machine using MATLAB/Simulink International conference
Yusuke Okunishi
27th International Conference on Electrical Machines and Systems (ICEMS2024) 2024.11 The Institute of Electrical Engineering of Japan
Event date： 2024.11
Language：English Presentation type：Oral presentation (general)
Venue：Fukuoka Institute of Technology, Fukuoka, Japan Country：Japan
This paper proposes an evaluation model for PWM carrier loss in claw-pole machines employed for ISG applications under dual three-phase drive. The PWM carrier loss is evaluated based on PWM carrier voltage waveform and high-frequency impedance. The proposed model is composed of the equivalent circuit model that uses machine parameters measured from an actual machine, and PWM carrier loss is evaluated using the PWM carrier voltage waveform obtained from the proposed model and the measured high-frequency impedance. The validity of the proposed model is examined by comparing the model-based evaluation results with the experimental results.
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Multi-mode Vibration Suppression for Electric Machines using Passive Dynamic Vibration Absorbers Mounting on Stator Outer Peripheral International conference
Naho Funasaka
27th International Conference on Electrical Machines and Systems (ICEMS2024) 2024.11 The Institute of Electrical Engineering of Japan
Event date： 2024.11
Language：English Presentation type：Poster presentation
Venue：Fukuoka Institute of Technology, Fukuoka, Japan Country：Japan
This paper presents multi-mode vibration suppression of electromechanical systems using a passive dynamic vibration absorber attached to a stator outer peripheral of an electric machine. The principle of vibration generation in an electric motor is explained. Subsequently, the structure and design procedure of passive dynamic vibration absorber for each vibration mode. The arrangement of these passive dynamic vibration absorbers on the stator periphery is then examined. Finally, the multi-mode vibration suppression effect is validated through hammering tests using a stator core with fabricated passive dynamic vibration absorbers attached.
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ダイナモベンチを利用しないモータ巻線のオンライン絶縁寿命試験装置の開発
矢頭 大輔
電気学会 半導体電力変換/モータドライブ合同研究会 2024.09 一般社団法人電気学会
Event date： 2024.09
Language：Japanese Presentation type：Oral presentation (general)
Venue：南相馬市民情報交流センター Country：Japan
Industrial Property Rights
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Rotating Electric Machine
Application no：EP17884022.9 Date applied：2017.12
Patent/Registration no：EP17884022.9 Date registered：2024
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Electric Charging Device Installed on Vehicle
Application no：CN202410876519.X Date applied：2024.07
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IN-VEHICLE CHARGING DEVICE
Application no：EP24184294.7 Date applied：2024.06
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回転電機制御装置
サハ スブラタ、岩井 宏起、小坂 卓、松盛 裕明、齋藤 尚登、伊藤 悦申、藤原 勲
Applicant：株式会社アイシン、国立大学法人名古屋工業大学
Application no：2021-566826 Date applied：2020.09
Announcement no：WO-A1-2021/131203 Date announced：2021.07
Patent/Registration no：7269576 Date registered：2023.04 Date issued：2023.05
Rights holder：株式会社アイシン、国立大学法人名古屋工業大学
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Rotating Electric Machine, Compressor, Refrigerator Device and Vehicle
Application no：US17/956019
Patent/Registration no：US17/956019 Date registered：2024.11
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Motor
Takashi Kosaka, Yoshiaki Kano, Yoshihisa Hojo
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
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Rotating Electric Machine
Yoshinari Asano, Takashi Kosaka
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
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Rotating Electric Machine
Yoshinari Asano, Takashi Kosaka
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
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.
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Control Unit of Switched Reluctance Motors
Hiroshi Shimada, Takashi Kosaka
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
Awards
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2024.08 一般社団法人電気学会産業応用部門 2023年部門大会実行委員会副委員長としての貢献
2023年部門大会実行委員会
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
部門活動功労賞
2023年部門大会実行委員会副委員長としての貢献
あなたは2023年部門大会実行副委員長としてその準備・実施にご尽力され当部門発展のため献身的に活動されました
この貢献に敬意を表し産業応用部門表彰規程に基づき部門活動功労賞を贈呈いたします。 -
2024.05 一般社団法人電気学会 用途指向形モータの技術変遷と期待される次世代技術（電気学会技術報告第1507号）
用途指向形次世代モータ調査専門委員会
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
優秀技術活動賞 技術報告賞
用途指向形モータの技術変遷と期待される次世代技術（電気学会技術報告第1507号）
優秀技術活動賞 技術報告賞
表記の功績を顕彰するため、電気学会表彰規程にもとづき技術報告賞を贈呈いたします。 -
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
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
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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
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.
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中部経済産業局感謝状
2012.12 中部経済産業局
小坂 卓
Country：Japan
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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
Award type：Award from publisher, newspaper, foundation, etc. Country：Japan
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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
Award type：Award from international society, conference, symposium, etc. Country：Japan
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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
Award type：Honored in official journal of a scientific society, scientific journal Country：Japan
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Committee Prize Paper Award (Third Prize), The Electric Machine Committee of the IEEE Industry Applications Society
2007.12
Award type：Award from international society, conference, symposium, etc. Country：United States
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技術部門貢献賞
2016.08 公益社団法人 自動車技術会
小坂 卓
Country：Japan
技術会議モータ技術部門委員会への多大なる貢献
Committee Memberships
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電気学会 電気学会東海支部活動推進員
2010.04
Committee type：Academic society
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電気学会 自動車技術委員会１号委員
2010.04
Committee type：Academic society
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パワーエレクトロニクス学会 評議員
2001.04
Committee type：Academic society