KOSAKA Takashi

写真a

Affiliation Department etc.

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

Title

Professor

Mail Address

E-mail address

Research Fields, Keywords

Motors for HEV/EV Traction Applications, Rare-earth less Motors, Control and Design of Motors with Low Noise and Vibration

Graduating School

  •  
    -
    1994.03

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

Graduate School

  •  
    -
    1999.03

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

  •  
    -
    1996.03

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

Degree

  • Nagoya Institute of Technology -  Master (Engineering)

  • Nagoya Institute of Technology -  Doctor (Engineering)

External Career

  • 2002.11
    -
    2004.10

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

Academic Society Affiliations

  • 2003.10
    -
    Now

    IEEE(Institute of Electrical and Electronic Engineers)

  • 1994.07
    -
    Now

    The Institute of Electrical Engineers of Japan

  • 2001.04
    -
    Now

    The Japna Institute of Power Electronics

  • 2009.10
    -
    Now

    The Insititute of Electrical Installation Engineers of Japan

  • 2012.11
    -
    Now

    Society of Automotive Engneers of Japna, Inc.

Field of expertise (Grants-in-aid for Scientific Research classification)

  • Control engineering/System engineering

  • Power engineering/Power conversion/Electric machinery

 

Papers

  • Study on commutation control method for reducing noise and vibration in SRM

    Sungyong Shin, Naoki Kawagoe, Takashi Kosaka, Nobuyuki Matsui

    IEEE Transactions on Industry Applications ( The Institute of Electrical and Electronics Engineers, Inc )  54 ( 5 ) 4415 - 4424   2018.04  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    Many kinds of commutation methods have been proposed to reduce the noise and vibration in a switched reluctance motor (SRM). One of these is well known as the two-stage commutation method. However, it has a defect that is principally revealed when an SRM is operated at high speed and under a high-load condition. This study investigated why vibration reduction based on two-stage commutation does not work through an electromagnetic-structural coupled analysis using a finite element method and mathematical analysis of the exciting force in a 0.4 kW four-phase 8/6 SRM. Based on the investigations, a modified method is proposed to reduce the vibration and noise independent of the operating condition. Experimental studies using the tested SRM demonstrated that the proposed modified control method could reduce the noise and vibration at high speed and under a high-load condition.

  • Hybrid Excitation Flux Switching Motor with Permanent Magnet Placed at Middle of Field Coil Slots Employing High Filling Factor Windings

    Takeshi Okada, Hiroaki Matsumori, Takashi Kosaka, Nobuyuki Matsui

    Proc. of 2018 IEEE Energy Conversion Congress and Exposition (ECCE) ( The Institute of Electrical and Electronics Engineers, Inc. )    4268 - 4274   2018.09  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    Design and experimental studies on Hybrid
    Excitation Flux Switching Motor (HEFSM) applied to a
    traction motor for hybrid electric vehicles are presented. A stator body of HEFSM generally consists of not only laminated core and three-phase armature coils, but also field excitation coils and permanent magnets as field mmf sources. Therefore, each material used in the stator body should be designed properly with the purpose of performance improvements such
    as efficiency, power and torque densities, cost and so forth. The configuration and the arrangement of all coils are examined to increase their filling factor for reducing copper losses. Moreover, thinner electromagnetic steel and permanent magnets with high remanent flux density are employed to achieve higher efficiency. Experimental tests using a prototype
    of HEFSM validate the design results.

  • Design Study on Salient Pole Shape of Rotor in SR Motor for Vibration Suppression under 2-Stage Commutation Control

    Sungyong Shin, Hikaru Naruse, Takashi Kosaka, Nobuyuki Matsui

    Proc. of 2018 XIII International Conference on Electrical Machines (ICEM) ( The Institute of Electrical and Electronics Engineers, Inc. )    1479 - 1484   2018.09  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    For reducing the noise and vibration of switched
    reluctance motor (SRM), many kinds of control methods have been proposed. 2-stage commutation method is one of effective method for active vibration cancellation (AVC). For proper operation of the 2-stage commutation method, there should be no vibration except for that at commutation. However, vibration is generally occurred at the point which commutation is not produced. Although 2-stage commutation method is used, it is difficult to reduce these vibration. In this study, through the electro-magnetic structural coupled analysis based on FEA for vibration and electromagnetic force in 4-phase 8/6 SRM, the reason why other vibration are occurred and the vibration
    reduction based on the 2-stage commutation does not work are investigated. According to the nvestigations, a new design on the shape of rotor pole to reduce vibration and noise is proposed. Through simulation and experiment, the vibration and noise reduction are revealed.

  • Indirect Position Sensing at Stand-Still and Running State in SRM by Using Distributed Voltage and Voltage Rate for Injected Pulse

    Sungyong Shin, Takashi Kosaka, Nobuyuki Matsui

    Proc. of 2018 XIII International Conference on Electrical Machines (ICEM) ( The Institute of Electrical and Electronics Engineers, Inc. )    1558 - 1564   2018.09  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    To eliminate position sensor from switched reluctance motor drive, many kinds of position estimation methods have been proposed. Most of them require current or voltage sensing to compute inductance or flux linkage, and data tables concerning with these parameters and rotor position. The current sensor is generally expensive. In addition, large amount of memory is necessary to save the data tables. To overcome these problems in this paper, a simple position estimation method using a gradient of distributed phase voltage obtained from voltage injection into SRM through full bridge bipolar type inverter is proposed. However, this method has estimation error at some position. To solve this problem, also novel method using voltage rates of distributed voltage are proposed. As a result, the position estimation with high resolution in wide speed range including standstill is possible. Through experiment using 400W four-phase 8/6 test motor, the effectiveness of proposed method is demonstrated.

  • Hybrid Excitation Flux Switching Motor with High Filling Factor Windings

    Takashi Kosaka, Keisuke Isobe, Nobuyuki Matsui

    Proc. of the 31st International International Electric Vehicles Symposium & Exhibition (EVS 31) & International Electric Vehicle Technology Conference 2018 (EVTeC 2018) ( 一般財団法人 日本自動車研究所 )    1 - 6   2018.09  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    In this paper, design and experimental studies on a hybrid excitation flux switching motor (HEFSM) are presented. The HEFSM, which has permanent magnets placed at middle of field coil slots on stator body and employs high filling factor windings to improve motor efficiency owing to copper loss reduction, is designed as a traction motor for hybrid electric vehicles. The maximum torque and power as the design target are set to be 207Nm and 60kW, respectively. From the viewpoints of the maximum torque/power capabilities and the motor efficiency, experimental test results using a prototype HEFSM are demonstrated and discussed.

  • Torque Ripple Minimization Control of SRM Based on Novel Motor Model Considering Mutual Coupling Effect

    Sungyong Shin, Naruse Hikaru, Takashi Kosaka, Nobuyuki Matsui

    Proc. of 2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia) ( 一般社団法人電気学会 )    3418 - 3425   2018.05  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    In order to minimize torque ripple in switched reluctance motor (SRM), many kinds of methods have been proposed. One of them is current profile tracking control based on a motor model, torque-position-current model, which can be derived from magnetizing curves. However, the current profile tracking control has a problem which is an increase in torque ripple at the current overlapping region under high load condition. In this paper, through magnetic analyses using 2D-FEA and mathematical analyses regarding 4-phase 8/6 SRM, the reason of the increase in torque ripple is revealed and a novel torque- position-current model taking mutual coupling effect into account is proposed for better torque ripple minimization control.

  • Study on commutation control method for reducing noise and vibration in SRM

    Sungyong Shin, Naoki Kawagoe, Takashi Kosaka, Nobuyuki Matsui

    Proc. of 2017 20th International Conference on Electrical Machines and Systems (ICEMS) ( Institute of Electrical and Electronics Engineers )    1 - 6   2017.08  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    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.

  • Windage loss reduction for hybrid excitation flux switching motors based on rotor structure design

    Yasuhiro Okada, Takashi Kosaka, Nobuyuki Matsui

    Proc of 2017 IEEE International Conference on Electric Machines and Drives Conference (IEMDC) ( IInstitute of Electrical and Electronics Engineers )    1 - 8   2017.05  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    This paper presents design study on windage loss reduction for hybrid excitation flux switching motor employing two types of rotor structure. Conventional flux switching motors have a rotor structure with salient poles, by which windage loss at high speed region becomes serious. To reduce the windage loss, two types rotor are built: One is a cylindrical rotor employing iron rib between adjacent salient poles and shrouds placed at both ends in axial direction of rotor body and, the other is only employing the shrouds. Experimental tests using two machines combining with an existing stator and two rotors are conducted. As a result, the rotor with only the shrouds can greatly reduce the windage loss while keeping the maximum torque and power, and motor efficiency at high speed region as it is. From a viewpoint of windage loss reduction, different rotor configurations with and without the shroud are investigated by 3D-FEA based fluid analyses and discussed.

  • Drive Characteristics of High Efficiency Hybrid Excitation Motor for Automobiles

    Takashi Kosaka, Akira Ozeki, Nobuyuki Matsui

    Journal of the Japan Society of Applied Electromagnetics and Mechanics ( The Japan Society of Applied Electromagnetics and Mechanics )  24 ( 3 ) 246 - 251   2016.09  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    This paper presents design studies on a hybrid excitation motor (HEM) and experimental drive characteristics of the HEM for hybrid electric vehicle drive applications. Taking an IPMSM installed on PRIUS'2010 as the object of a comparison, the HEM is designed by means of trial and error using 3-dimensional finite element analysis (3D-FEA) and built as a test machine. With comparisons between the measured and the 3D-FEA-computed drive performances of the test motor, it is verified that the proposed HEM is a viable candidate as high efficiency motor for the target application.

  • Experimental Study on Windage Loss Reduction using Two Types of Rotor for Hybrid Excitation Flux Switching Motor

    Hiroki Nakane, Yasuhiro Okada, Takashi Kosaka and Nobuyuki Matsui

    Proc. of 2016 XXII International Conference on Electrical Machines (ICEM) ( Institute of Electrical and Electronic Engineers )    1707 - 1713   2016.09  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    This paper presents experimental studies on windage loss reduction using two types rotor for hybrid excitation flux switching motor that is intentionally designed so as to compete with an interior permanent magnet synchronous motor installed on TOYOTA PRIUS-2010. This machine makes it possible to vary its field flux by combining the two different mmf sources such as field excitation coils and permanent magnets. Generally, as hybrid excitation flux switching motors have a rotor with salient pole structure like a switched reluctance motor, a large amount of windage loss at high speed region damages motor efficiency. In this paper, two types of rotor, one with cylindrical shape and the other with covered by only shroud located at both axial end of rotor core are built and tested. Compare with a conventional salient pole rotor, it is found that the rotor with only shroud can dramatically reduce windage loss while keeping other drive performances as it is.

display all >>

Books

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

    Takashi Kosaka, et.al. (Part: Multiple Authorship ,  1st Chapter, 7th Chapter )

    The Institute of Electrical Engineering Japan  2018.12

    1st Chapter, 7th Chapter

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

    Yuji Enomoto, et.al. (Part: Allotment Writing ,  2.2.6 Hybrid Excitation Motor (Permanent Magnet on Stator) )

    The institute of Electrical Engineers in Japan  2017.08

    2.2.6 Hybrid Excitation Motor (Permanent Magnet on Stator)

  • A Technology Trend of Electric Motors for EV/HEV

    Nobuyuki Matsui, Kan Akatsu et.al. (Part: Allotment Writing ,  General Remarks )

    The Institute of Electrical Engineers in Japan  2017.05

    General Remarks

  • Reluctance Torque Assisted Motors

    Masayuki Morimoto, Takashi Kosaka, et.al (Part: Multiple Authorship ,  Chapter 2 Section 4, Chapter 7 )

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

    Chapter 2 Section 4, Chapter 7

  • Less Rare-Earth and Rare-Earth Free Motors

    Nobuyuki Matsui, Takashi Kosaka, et.al. (Part: Multiple Authorship )

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

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

    Akio Toba, Takashi Kosaka, etc. (Part: Multiple Authorship )

    The Institute of Electrical Engineering Japan  2013.05

  • Handbook of motor technologies for practical use

    (Part: Multiple Authorship )

    THE NIKKAN KOGYO SHINBUN, Ltd  2001.04 ISBN: 4-526-04715-5

Review Papers

  • Noise and Vibration Reduction in SR Motor

    Takashi Kosaka

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

    Introduction and explanation (scientific journal)   Single Author

  • Technical Trend in Motor s for xEV Electrical Propulsion

    Takashi Kosaka

    Die and Mould Technology ( THE NIKKAN KOGYO SHIMBUN,LTD )  33 ( 1 )   2017.12  [Invited]

    Introduction and explanation (commerce magazine)   Single Author

  • Introduction of Researches and Deveploments on Motors as Electric Machines

    Takashi Kosaka

    ( The Japan Research and Development Center for Metals )  ( 360 ) 2 - 4   2016.10  [Invited]

    Prompt report, short report, and research note, etc. (bulletin of university, research institution)   Single Author

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

    Takashi Kosaka

    Transistor Gijutsu ( CQ Publishing Co.,Ltd. )  52 ( 12 ) 131 - 136   2015.12  [Invited]

    Introduction and explanation (commerce magazine)   Single Author

Presentations

  • Hybrid Excitation Flux Switching Motor with High Filling Factor Windings

    Takashi Kosaka

    The 31st International International Electric Vehicles Symposium & Exhibition (EVS 31) & International Electric Vehicle Technology Conference 2018 (EVTeC 2018)  (神戸コンベンションセンター)  2018.09  -  2018.10  一般財団法人 日本自動車研究所

  • Noise and Vibration Reduction in SR Motor based on Flux Wavefrom Control

    Takashi Kosaka  [Invited]

    Techno-Frontier2018 38th Symposiumu on Motor Technology  (Makuhari Messe)  2018.04  -  2018.04  Japan Management Association

  • Development of Variable Flux Hybrid Excitation Motor

    Takashi Kosaka  [Invited]

    JMAG Users Conference 2017  (Tokyo Conference Center Shinagawa)  2017.12  -  2017.12  JSOL Corporation

  • Loss Analysis of Variable Flux Machines

    Takashi Kosaka  [Invited]

    7th Seminar for Electromagnetic Analsys toward Next Generation   (JP Tower in Nagoya Hall & Conference )  2017.07  -  2017.07  JSOL Corporation

  • Technical Trend in Variable Flux Motors

    Takashi Kosaka  [Invited]

    Techno-Frontier2017 37th Symposiumu on Magnetics Apptication  (Makuhari Messe)  2017.04  -  2017.04  Japan Management Association

  • Design Study on Hybrid Excitation Flux Switching Motor with Permanent Magnet Placed at Middle of Field Coil Slot for HEV Drives

    Takashi Kosaka

    XXIIth International Conference on Electrical Machines (ICEM'2016)  (SwissTech Convention Center)  2016.09  -  2016.09  The International Conference of Electrical Machines Association (ICEM)

  • Variable Flux Motor Technique of Achieving High Power Density and Efficiency

    Takashi Kosaka

    2016 IEE-Japan Industry Applications Society Conference  (Aramaki Campus, Gumma University)  2016.08  -  2016.09  The Institute of Electrical Engineers of Japan

  • Research and Development of Variable Field Motor

    Takashi Kosaka  [Invited]

    2016.07  -  2016.07 

  • Variable Field Flux Machines for Traction Motors Aimed at Downsizing and Low Energy Consumption

    Takashi Kosaka

    2016 IEE-Japan National Cenvention  (Kwauchikita Campus, Tohoku University)  2016.03  -  2016.03  The Institute of Electrical Engineers of Japan

  • Drive Characteristics of High Efficiency Hybrid Excitation Motor for Automobiles

    Takashi Kosaka

    24th MAGDA Conference in Tohoku   (Tohoku University)  2015.11  -  2015.11  The Japan Society of Apllied Llectromagnetics and Mechatoronics

display all >>

Industrial Property

  • Rotating Electric Machine

    特願 2016-166428  特開 2017-63597  特許 6139007

    Rotating Electric Machine

  • Control Unit of Switched Reluctance Motors

    特願 2012-185300  特開 2014-14552  特許 6069953

    Control Unit of Switched Reluctance Motors

  • Rotating Machine

    特願 2012-69859  特開 2013-201869  特許 5798072

    Rotating Machine

  • Rotating Electric Machine

    特願 13/407472  特許 9083225

    Rotating Electric Machine

  • Rotating Electric Machine

    特願 201210047825.X  特許 ZL201210047825.X

    Rotating Electric Machine

  • Rotating Machine

    特願 2012-3336  特開 2013-14386 

    Rotating Machine

  • Motor Drive Unit and Vehicle Mounting It

    特願 201110083298.3  特許 ZL201110083298.3

    Motor Drive Unit and Vehicle Mounting It

  • Drive Device for Electric Machine and Vehicle installing it

    特願 13/081040  特許 8896252

    Drive Device for Electric Machine and Vehicle installing it

  • Rotating Electric Machine

    特願 2011-045310  特開 2012-182941  特許 5572115

    Rotating Electric Machine

  • Variable Field Type Rotating Electric Machine

    特願 2011-014748   特開 2012-157182   特許 5738609

    Variable Field Type Rotating Electric Machine

display all >>

Academic Awards Received

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

    2007.12    

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

    2007.04    

 
 

Academic Activity

  • 2010.04
    -
    Now

    The Institute of Electrical Engineers of Japan  

  • 2010.04
    -
    Now

    The Institute of Electrical Engineers of Japan  

  • 2001.04
    -
    Now

    The Japna Institute of Power Electronics