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

  • 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.

  • Three-phase variable flux outer-rotor switched flux permanent magnet machine

    M. Z. Ahmad, E. Sulaimanm, G. M. Romalan, M. Jenal, T. Kosaka

    Proc. of 2016 XXII International Conference on Electrical Machines (ICEM) ( Institute of Electrical and Electronic Engineers )    2563 - 2569   2016.09  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    High torque density and robust rotor structure outer-rotor switched flux permanent magnet (SFPM) machine with DC excitation is proposed for emerging candidates to replace conventional electric motor of direct drive electric vehicle (EV). The extraordinary of DC excitation coil provides higher generated flux and flux control capability that suitable for various operating conditions. With the concept of motor housing inside the wheel, mechanical transmission as conventionally applied in centralized drive can be eliminated. In this paper, the proposed machine operating principle, predicted back electromagnetic force, cogging torque and torque production based on 2D-FEA are validated experimentally on the developed prototype. The results obtained show that there is good agreement between 2D-FEA and experiments.

  • Design Studies on Hybrid Excitation Flux Switching Motor with High Power and Torque Densities for HEV Applications

    Yuya Maeda, Takashi Kosaka and Nobuyuki Matsui

    Proc. of 2016 XXII International Conference on Electrical Machines (ICEM) ( Institute of Electrical and Electronic Engineers )    2522 - 2528   2016.09  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    This paper presents design studies on hybrid excitation flux switching motor (HEFSM) that can compete with an interior permanent magnet synchronous motor (IPMSM) installed on TOYOTA PRIUS-2010. A stator of the HEFSM consists of not only laminated core and three-phase armature windings, but also field excitation coils and permanent magnets as field mmf sources. This machine makes it possible to vary its field flux by combining the two different mmf sources and thus, the name is capped by “hybrid excitation” as a variable field flux motor. The first trial manufacturing of HEFSM has been built for tests to assess its drive performances. Based on analysis of the test results, design refinements on the first test motor are ex-amined to make the second trial manufacturing. Various ex-perimental test results using the second test motor demon-strate that drive performances of the HEFSM are comparable to those of the PRIUS’s IPMSM.

  • Digital PWM Control-Based Active Vibration Cancellation for Switched Reluctance Motors

    Hiroaki Makino, Takashi Kosaka, Nobuyuki Matsui

    IEEE Transactions on Industry Applications ( IEEE )  51 ( 6 ) 4521 - 4530   2015.11  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    This paper presents a study on a control strategy for active vibration cancellation (AVC) and noise reduction in switched reluctance (SR) motors. It has been revealed that two-stage commutation control based on the natural frequency of the stator body has been effective in suppressing the vibration occurring on the stator body at the commutation. According to some considerations on the generation mechanism of the vibration, a new AVC control for variable-speed SR motor drives under digital PWM control is proposed. Experimental studies using a 12-kW three-phase 12/8 SR motor demonstrate that the proposed two-step commutation control using negative voltage PWM is much effective as an AVC and noise reduction technique. Moreover, the proposed control is evaluated from the viewpoints of drive performances such as torque ripple and copper loss.

  • Torque-Maximizing Design of Concentrated-Winding IPMSM for Saliency-Based Sensorless HEV Drives

    Yoshiaki Kano, Takashi Kosaka, Nobuyuki Matsui

    IEEJ Transactions on Industry Applications ( The Institute of Electrical Engineers of Japan )  135 ( 9 ) 929 - 938   2015.09  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    This paper presents the design of a signal-injection-based sensorless interior permanent magnet synchronous motor (IPMSM) for a traction drive in hybrid electric vehicles (HEVs). To realize an accurate design, the sensorless safety operation region (SSOR) is introduced to account for the cross-coupling magnetic saturation and harmonics of inductance distributions. The SSOR defines a working point on the maximum torque per ampere trajectory at which the motor can perform sensorless operation with a guaranteed performance in the steady state. The reliability of the SSOR was verified in experiments using a prototype. The influence of the IPM motor geometry on the SSOR was then examined. Under the given dimensional constraints, the design of a 100Nm-10 kW 12-pole, 18-slot IPMSM was optimized to meet the requirements for the target traction drive in an HEV. The validity of the proposed design was verified by using a MATLAB/SIMULINK-based dynamic simulator.

  • An Experimental Verification of High Power Production Mechanism by Increasing Field Winding Current in Wound Field Flux Switching Motor for HEV Traction Drive

    Yu Kuwahara, Takashi Kosaka, Yoshinobu Kamada, Hiroaki Kajiura, Nobuyuki Matsui

    IEEJ Transactions on Industry Applications ( The Institute of Electrical Engineers of Japan )  135 ( 9 ) 939 - 947   2015.09  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    This paper presents the design of a signal-injection-based sensorless interior permanent magnet synchronous motor (IPMSM) for a traction drive in hybrid electric vehicles (HEVs). To realize an accurate design, the sensorless safety operation region (SSOR) is introduced to account for the cross-coupling magnetic saturation and harmonics of inductance distributions. The SSOR defines a working point on the maximum torque per ampere trajectory at which the motor can perform sensorless operation with a guaranteed performance in the steady state. The reliability of the SSOR was verified in experiments using a prototype. The influence of the IPM motor geometry on the SSOR was then examined. Under the given dimensional constraints, the design of a 100Nm-10 kW 12-pole, 18-slot IPMSM was optimized to meet the requirements for the target traction drive in an HEV. The validity of the proposed design was verified by using a MATLAB/SIMULINK-based dynamic simulator.

  • Torque Ripple Reduction Design of Concentrated-Winding IPMSM with New Flux Barrier for Saliency-Based Sensorless Drives

    Yoshiaki Kano, Takashi Kosaka, Nobuyuki Matsui, Toshihito Nakanishi

    IEEJ Transactions on Industry Applications   135 ( 6 ) 725 - 733   2015.06  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Instantaneous Current Profile Control of Four Phases SR Motor for Industrial Servo Drives

    Hiroaki Makino, Takashi Kosaka, Shinya Morimotoi, Motomichi Ohto, Nobuyuki Matsui

    IEEJ Transactions on Industry Applications   135 ( 6 ) 711 - 717   2015.06  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Control of Wound Field Synchronous Motor Integrated with ZSI

    27. G. Tajima, T. Kosaka, N. Matsui, K. Tonogi, N. Minoshima, T. Yoshida

    IEEJ Journal of Industry Applications   4 ( 3 ) 196 - 203   2015.05  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    This paper proposes a novel variable speed motor drive, wound field synchronous motor (WFSM) drive integrated with Z-source inverter (ZSI). The proposed WFSM is non-permanent magnet machine and employs two field coils as dc field mmf sources. On the other hand, ZSI has an impedance-network which is composed of two dc reactors and two capacitors. In the proposed drive, the two field coils of WFSM act not only as dc field mmf sources, but also as dc reactors in ZSI, resulting in size and cost reductions of the drive system. In order to achieve both the voltage boost-up and the field current controls simultaneously, its control algorithm is examined. Experimental results using a test drive system show that the proposed drive under the proposed control works properly.

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Books

  • 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

  • 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

  • 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

  • Drive Characteristics of Hybrid Excitation Flux Switching Motor for Vehicle Propulsion

    Takashi Kosaka

    2015 JSAE Annual Congress (Spring)   (Pacifico Yokohama)  2015.05  -  2015.05  Society of Automotive Engineers of Japan

  • Driving Method of Low Noise and Vibrations for SRM

    Takashi Kosaka

    33rd Forum on Motor Technology  2015.02  -  2015.02 

  • Noise and Vibration Suppression of SRM by Commutation Control

    Techno -Frontier2014 The 34th Symposium on Motor Technology  2014.07  -  2014.07 

  • EXPERIMENTAL DRIVE PERFORMANCE EVALUATION OF WOUND FIELD FLUX SWITCHING MACHINE AS A 100kW-CLASS TRACTION MOTO

    Takashi Kosaka

    EVTeC and APE Japan  (Annex Hall, Pacifico Yokohama, Yokohama)  2014.05  -  2014.05  JSAE

  • Recent Technical Trends in Magnetic Material

    Takashi Kosaka

    The 2014 International Power Electronics Conference –ECCE ASIA- (IPEC-Hiroshima2014)  (International Conference Center Hiroshima, Hiroshima, Japan)  2014.05  -  2014.05  IEEJ Industry Applications Society

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Industrial Property

  • 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

  • Drive Device for Electric Machine and Vehicle installing it

    特願 2010-087862   特開 2011-223680   特許 5558176

    Drive Device for Electric Machine and Vehicle installing it

  • Drive Device for Electric Machine

    特願 200880008507.4  特開 101632221  特許 ZL200880008507.4

    Drive Device for Electric Machine

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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