SATO Yasukazu

Affiliation

Faculty of Engineering, Division of Systems Research

Job Title

Professor

Date of Birth

1966

Research Fields, Keywords

Actuator, Mechatronics, Electromagnetic Actuator, Fluid Power Systems, Power Transmission

Mail Address

E-mail address

Related SDGs




写真a

The Best Research Achievement in Research Career 【 display / non-display

  • 【Published Thesis】 Development of a 2-Degree-of-Freedom Rotational/Linear Switched Reluctance Motor  2007.06

    【Published Thesis】 Development of a Common-Rail Proportional-Injector Actuated by a Tandem Arrayed Giant-Magnetostrictive Device  2001.04

    【Published Thesis】 Power-Saving Magnetizing Device for Magnetorheological Fluid Control Using Permanent Magnet  2014.11

Education 【 display / non-display

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    1994

    Yokohama National University   Completed

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    1989

    Yokohama National University   Graduated

Degree 【 display / non-display

  • Master of Engineering - Yokohama National University

  • Doctor of Engineering - Yokohama National University

Campus Career 【 display / non-display

  • 2012.12
     
     

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Professor  

  • 2007.4
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    2012.11

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Associate Professor  

  • 2001.4
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    2007.3

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Associate Professor  

  • 1998.4
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    2001.3

    Duty   Yokohama National UniversitySchool of Engineering   Associate Professor  

  • 1994.4
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    1998.3

    Duty   Yokohama National UniversitySchool of Engineering   Lecturer  

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Academic Society Affiliations 【 display / non-display

  • 1988
     
     
     

    日本機械学会

  • 1994
     
     
     

    自動車技術会

  • 1990
     
     
     

    日本フルードパワーシステム学会

  • 1995
     
     
     

    電気学会

  • 1997
     
     
     

    IEEE, The Institution of Electrical and Electronics Engineers

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Research Areas 【 display / non-display

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

  • Informatics / Robotics and intelligent system

  • Informatics / Mechanics and mechatronics

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Machine elements and tribology

  • Others / Others  / Mchatronics

 

Research Career 【 display / non-display

  • Study on Motion Control

    Project Year:

  • Study on Fluid Power Systems

    Project Year:

  • Study on Electro-magnetic Actuator

    Project Year:

Books 【 display / non-display

  • Basic/Advanced Engineering for Automotive Course

    Hiroaki Morimura,Yasukazu Sato,Hidenori Kosaka,Mitsuharu Oguma( Role: Joint author)

    Society of Automotive Engineers of Japan, JSAE 

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    Language:Japanese Book type:Scholarly book

Thesis for a degree 【 display / non-display

  • シート形油圧制御弁による高速流体制御に関する研究(博士論文)

    佐藤恭一

    1994.3

    Doctoral Thesis   Single Work  

    DOI

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    横浜国立大学大学院工学研究科博士課程後期生産工学専攻

    弁の内部もれが無く,作動油中のごみや振動に強いシート形油圧制御弁を用いた流体制御を対象とし,その制御手法の一つである流体パルス制御の課題:(1)流体パルス制御シート弁の応答性の向上,(2)微小流量から大流量までの連続的な制御が行えるシート弁の開発,(3)従来のスプール弁制御で問題となっている重慣性負荷高速制御時のサージ圧力の低減とキャビテーションの回避を可能とするシート弁による電子油圧制御システムの構築,について成果をあげた。

  • 高速電磁弁による比例シート弁の制御に関する研究(修士論文)

    佐藤恭一

    1991.3

    Master Thesis   Single Work  

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    横浜国立大学大学院工学研究科博士課程前期生産工学専攻

    従来,開閉のオンオフ的な作動のみが可能であったシート弁本体にフィードバック流路を設けることにより,主弁開度をパイロット弁開度に比例して制御できる比例シート弁を開発した.主弁は油圧力により支持されるので,従来形シート弁に比べ,極めて高い剛性と固有振動数を持つ.反面,負荷圧力変動等の外乱をトリガーとして自励振動が発生しやすい問題が有り,これをボンドグラフを用いた動特性解析と,バランススプールの付加により解決した。

Papers 【 display / non-display

  • Improving the Overall Efficiency of an Electro-hydraulic Drive System by using Efficiency Maps

    PHAN Ha Tham, SATO Yasukazu

    JFPS International Journal of Fluid Power System   14 ( 1 )   10 - 18   2021.8  [Reviewed]

    DOI CiNii

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:一般社団法人 日本フルードパワーシステム学会   Joint Work  

    <p>IIn recent years, numerous applications of the variable-speed variable-displacement (VS-VP) hydraulic power unit have been investigated. Especially in a valveless drive system, the necessary hydraulic power could be supplied effectively through a flexible motor speed and pump displacement ratio. This paper presents a control strategy to improve the overall efficiency of a valveless transmission system by regulating motor speed and the displacement ratio simultaneously based on the data of combined overall efficiency maps. In this way, the interaction of the servo motor and hydraulic pump – and whether it affects the overall efficiency of the system – are studied. A numerical simulation is implemented for a series of typical working points of three types of hydraulic power units. The results show that the proposed control strategy achieves better efficiency values in almost all simulation points compared with single-variable power units (variable speed unit (VSFP) and variable displacement unit (FS-VP)). In particular, at a low pressure and low flow rate points, the efficiency of the proposed system is improved by up to 6% and 25%, respectively, compared with the VS-FP and FS-VP power units.</p>

    Other Link: https://ci.nii.ac.jp/naid/130008071165

  • Development of Hydraulic Pump Drive System Using Switched Reluctance Motor with Servo Function

    Ha Tham Phan, Itagaki Seiya, Sato Yasukazu

    JOURNAL OF ROBOTICS AND MECHATRONICS   32 ( 5 )   984 - 993   2020.10  [Reviewed]

    DOI Web of Science CiNii

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:富士技術出版株式会社   Joint Work  

    <p>A switched reluctance motor (SRM) generates a reluctance torque without the power of a permanent magnet, rendering it a candidate for rare-earth free motors. Compared with a permanent magnet synchronous motor (PMSM), SRMs also offer operational advantage in high-temperature environments owing to their robust structure. However, SRMs are generally inferior to PMSMs in terms of torque ripple, noise, and speed control, in particular. Therefore, this study attempts to improve the controllability of SRMs by proposing an SRM driving method in the form of a bidirectional rotation torque and a speed-controllable servomotor. The advantage of this method is evaluated experimentally using a closed-loop hydraulic system (valveless control system), which includes a hydraulic pump driven by an SRM to supply hydraulic power to actuators. The results show that the pump flow rate and hydraulic motor speed are consistent with the sinusoidal commands corresponding to the forward and reverse rotations of the SRM.</p>

    Other Link: https://ci.nii.ac.jp/naid/130007928037

  • Viscosity Control of Magnetorheological Fluid by Power Saving Magnetizing Mechanism Using Movement of Permanent Magnet

    Kawasaki Jumpei, Nakamura Yuki, Sato Yasukazu

    JOURNAL OF ROBOTICS AND MECHATRONICS   32 ( 5 )   977 - 983   2020.10  [Reviewed]

    DOI Web of Science CiNii

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:富士技術出版株式会社   Joint Work  

    <p>Generally, the magnetic field applied to a magnetorheological fluid (MRF) is generated by electromagnets. Electromagnets consume electric power during MRF magnetization, which is an issue. In this study, we examine two kinds of magnetizing mechanism using a permanent magnet, instead of electromagnets, to save electric power and generate a magnetic field on the MRF. One mechanism linearly moves the permanent magnet into the magnetic circuit composed of yokes. The magnetic field intensity on the MRF is then controlled by changing the overlap between the magnet and the yokes. The other mechanism rotates a permanent magnet in the magnetic circuit. The magnetic field intensity on the MRF is then controlled by changing the relative angular position between the magnet and the yokes. These two mechanisms normally generate force or torque on the magnet toward a magnetically stable position concerning the magnet, and the force or torque causes power consumption to hold and move the magnet. We design herein special magnetic circuits and a cancelation mechanism for the force or torque that drastically reduce the power consumption during the MRF magnetization compared with an electromagnet-type magnetizing device.</p>

    Other Link: https://ci.nii.ac.jp/naid/130007928026

  • Magnetorheological fluid control by non-electromagnetic magnetizing mechanism - Consideration of effective magnetic circuit -

    The Proceedings on Autumn Conference of Japan Fluid Power System Society 2019   90 - 92   2019.11

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    Language:Japanese   Publishing type:Research paper (research society, symposium materials, etc.)   Joint Work  

  • Control valve operation by 3-phase electromagnetic push-pull bidirectional linear actuator

    The Proceedings on Autumn Conference of Japan Fluid Power System Society 2019   161 - 163   2019.11

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    Language:Japanese   Publishing type:Research paper (research society, symposium materials, etc.)   Joint Work  

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Review Papers 【 display / non-display

  • エンジン,モータなどの動力発生原理

    佐藤恭一

    油空圧技術   59 ( 5 )   38 - 42   2020.5

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:日本工業出版   Single Work  

  • 油空圧制御機器の制御インターフェース

    佐藤恭一

    油空圧技術   59 ( 5 )   43 - 47   2020.5

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:日本工業出版   Single Work  

  • 永久磁石を用いた磁気粘性流体の省動力界磁

    佐藤恭一

    油空圧技術   58 ( 2 )   41 - 45   2019.2

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Single Work  

  • “電磁弁解析”, 油空圧技術, vol. 57, no. 8, pp. 36-41, 2018.8.

    油空圧技術, vol. 57, no. 8, pp. 36-41, 2018.8.   57 ( 8 )   36 - 41   2018.8

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  • 比例ソレノイドの解析技術

    佐藤恭一

    ターボ機械   43 ( 5 )   30 - 36   2015.5

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:ターボ機械協会   Single Work  

    アクチュエータのアーマチャの位置に寄らず電流に比例した推力を発生する比例ソレノイドは,磁気漏れと磁気飽和の減少を巧みに利用するため,磁気回路の設計が難しい.そこにCAEと電磁界解析技術を導入することにより,効率よく,短時間で比例ソレノイド磁気回路を設計するプロセスを紹介した。

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Industrial Property Rights 【 display / non-display

  • 2方向移動検出方法,2方向移動検出装置,および2方向移動検出用ターゲット部材

    佐藤恭一

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    Applicant:国立大学法人横浜国立大学

    Application no:2008-193880  Date applied:2008.7

    Announcement no:2010-32321  Date announced:2010.2

    Country of applicant:Domestic  

  • 回転・直動2自由度モータ

    佐藤恭一

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    Applicant:横浜国立大学

    Application no:特願2006-144996  Date applied:2006.5

    Country of applicant:Domestic  

    固定子と,出力軸方向に移動可能に回転支持した回転子とを備え,前記固定子は,前記回転子の回転方向への起磁力を生成して回転子に対してトルクを発生させ,固定子の磁極が形成する出力軸の軸方向の磁束密度分布を制御して回転子に対して軸方向推力を発生させることを特徴とする,回転・直動2自由度モータ

  • 磁歪素子アクチュエータ

    佐藤恭一,佐藤泰雄

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    Applicant:よこはまティーエルオー株式会社,株式会社オーセンティック

    Application no:特願2005-118113  Date applied:2005.4

    Announcement no:特開2006-302937  Date announced:2006.11

    Country of applicant:Domestic  

    携帯型機器のディスプレイ装置等のような狭小機器又は小寸法機器に組み込むことができ,しかも,比較的高剛性の被駆動部材を駆動することができる磁歪素子アクチュエータを提供する.

  • APPARATUS AND METHOD FOR CONTROLLING DRIVING OG A HYDRAULIC CYLINDER OF HYDRAULIC PRESS EQUIPMENT

    Yasukazu Sato, Hirohisa Tanaka, Takeshi Nagata

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    Applicant:Nissinbo Industries, Inc.

    Application no:651997  Date applied:1996.6

    Publication no:5682742  Date published:1997.11

    Country of applicant:Foreign country  

  • 油圧プレス装置のラム駆動制御装置及び同駆動制御法

    佐藤恭一,田中裕久,永田武司

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    Applicant:日清紡株式会社

    Application no:特許出願平7-149651  Date applied:1995.5

    Announcement no:特許公開平8-309599  Date announced:1996.11

    Country of applicant:Domestic  

    油圧プレス装置のラム駆動制御に,2つの油圧動力源を用いて1つの油圧動力源によるシステムより消費動力を低減させる.

Awards 【 display / non-display

  • 日本フルードパワーシステム学会学術論文賞

    2020.5   一般社団法人日本フルードパワーシステム学会   油圧機械式無段変速機の設計手法に関する研究

    Individual or group name of awards: 佐藤恭一(横浜国立大学), 大内田剛史(ヤンマー株式会社)

  • 職業能力開発関係厚生労働大臣表彰 功労賞

    2017.11   厚生労働省 職業能力開発関係厚生労働大臣表彰   技能検定の推進

    Individual or group name of awards: 佐藤 恭一

  • 日本機械学会機素潤滑設計部門業績賞

    2017.4   (一社)日本機械学会 機素潤滑設計部門   機素潤滑設計分野における学術研究,技術開発および先駆的研究の推進

    Individual or group name of awards: 佐藤恭一

  • Outstanding Paper Award, The Japan Fluid Power System Society

    2008.9    

  • (社)日本油空圧学会SMC賞

    1993    

Grant-in-Aid for Scientific Research 【 display / non-display

  • 非電磁式省動力界磁機構による磁気粘性流体の流動粘性制御システムの構築 研究課題

    2019.4 - 2022.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(C)

    Investigator(s):佐藤恭一

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    Grant type:Competitive


    磁気粘性流体(Magnetorheological Fluid,以下MR流体)は,そのレオロジー特性である粘性が外部から印加された磁界の強さに応じて変化する機能性流体である.本研究では,その磁界の制御に,電磁石のように電力を消費しない永久磁石を活用し,動力を消費することなしにMR流体の粘性を制御する技術基盤を確立し,MR流体を用いたブレーキ,クラッチへの適用により,省動力な動力変換・制御システムの構築を目指す.

  • 回転・直動二自由度モータのサーボシステムの構築

    2010.4 - 2013.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(C)

    Investigator(s):佐藤恭一

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    Grant type:Competitive

Presentations 【 display / non-display

  • Application of Power-saving Technology to Fluid Power Motion Control

    K.Sato  [Invited]

    7th National Conference on Fluid Power,  (Changchun, China) 

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    Event date: 2012.8

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

    Venue:Changchun, China  

Preferred joint research theme 【 display / non-display

  • 機能性材料,機能性流体のアクチュエータ応用

  • Research on Fluid Power Systems

  • Research on Electro-magnetic Actuator

 

Charge of on-campus class subject 【 display / non-display

  • 2021   統合システム製作B

    Graduate school of Engineering Science

  • 2021   統合システム製作A

    Graduate school of Engineering Science

  • 2021   統合システム設計B

    Graduate school of Engineering Science

  • 2021   統合システム設計A

    Graduate school of Engineering Science

  • 2021   メカトロニクスデザイン

    Graduate school of Engineering Science

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Committee Memberships 【 display / non-display

  • 日本フルードパワーシステム学会

    2020.5  理事

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    Committee type:Academic society 

  • 日本機械学会 関東支部 商議員

    2011.4 - 2013.3  商議員

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    Committee type:Other 

  • CVT・ハイブリッド部門委員会

    2008.4  委員長

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    Committee type:Other 

  • 日本機械学会 関東支部神奈川ブロック運営委員会

    2008.4 - 2009.3  委員

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    Committee type:Other 

  • 日本機械学会 関東支部 商議員

    2008.4 - 2009.3  商議員

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    Committee type:Other 

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Social Contribution(Extension lecture) 【 display / non-display

  • MATLABとメカトロニクス

    工学研究院  横浜国立大学  2006.9

  • MATLABと電磁アクチュエータ設計

    工学研究院  横浜  2005.9

  • メカトロニクスデザイン

    工学研究院  東京・田町  2004.12