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Highly energy-regenerative bilateral actuators

Research Project

Project/Area Number 21H04556
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 21:Electrical and electronic engineering and related fields
Research InstitutionYokohama National University

Principal Investigator

Fujimoto Yasutaka  横浜国立大学, 大学院工学研究院, 教授 (60313475)

Co-Investigator(Kenkyū-buntansha) 下野 誠通  横浜国立大学, 大学院工学研究院, 准教授 (90513292)
小原 秀嶺  横浜国立大学, 大学院工学研究院, 准教授 (50772787)
Project Period (FY) 2021-04-05 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥41,730,000 (Direct Cost: ¥32,100,000、Indirect Cost: ¥9,630,000)
Fiscal Year 2023: ¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
Fiscal Year 2022: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
Fiscal Year 2021: ¥13,520,000 (Direct Cost: ¥10,400,000、Indirect Cost: ¥3,120,000)
Keywordsアクチュエータ / 減速機 / 回生効率
Outline of Research at the Start

小型で大きなトルクが必要となるロボットや搬送装置などで用いられる減速比1/100程度の減速機のエネルギー効率は力行動作時で約70%、回生動作時で約55%であるため、運動エネルギーを十分回収できない。本研究では、力行・回生効率ともに98%の減速機を備えた超高効率アクチュエータを提案する。減速機の力行・回生効率の理論限界の解明、および、減速機、モータ、電力変換回路からなるアクチュエータ全体の力行効率・回生効率の理論限界の解明を行う。また、超高効率アクチュエータで駆動されるロボットを備えた工場を想定し、力行動作のタイミングを適切に制御することで瞬時電力を低減する電力ネットワークのモデルを構築する。

Outline of Final Research Achievements

In actuators, reduction gearboxes with a large reduction ratio of 1/100 are used in applications such as robots, which are compact and require large torque. The energy efficiency of conventional reduction gears is about 70% in power operation and about 55% in regenerative operation, and energy loss is an issue for industrial robots that require frequent repetitive motion. In this study, the efficiency of a differential type 2K-H composite planetary gearbox with a single large planetary gear was maximized by optimization calculations, in which the difference in the number of teeth between the planetary gear and the internal gear was minimized as much as possible. Three types of reduction gears with a new structure were manufactured and compared, and the efficiency measurement experiment showed that the maximum efficiency was 84%, which was improved by approximately 10%. Frequency analysis revealed the influence of vibration caused by eccentricity.

Academic Significance and Societal Importance of the Research Achievements

減速機はモータのトルク不足を補う目的で用いられアクチュエータには必要不可欠な要素であるにも関わらずその効率向上の研究はほとんど行われてこなかった。ロボットや搬送機械で用いられる1/100程度の減速比の減速機については、力行動作時に30%もの損失があるばかりか、回生動作時には45%もの損失があり、実際には回生電力を利用せずに回生抵抗で熱として放出してしまっている。本研究の減速機効率の最大化手法により、ロボットや搬送装置でのエネルギー損失を低減でき、製造現場全体の大幅な省エネルギー化を実現できる。さらに、複数台組み合わせることにより瞬時消費電力の総和を抑え、負荷を平準化につなげることができる。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Comments on the Screening Results   Annual Research Report
  • Research Products

    (12 results)

All 2024 2023 2022 2021

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 8 results,  Open Access: 3 results) Presentation (4 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Airflow Cooling Mechanism for High Power-Density Permanent Magnet Motor2024

    • Author(s)
      Awungabeh Flavis Akawung, Besong John Ebot, Yasutaka Fujimoto
    • Journal Title

      IEEE Open Journal of the Industrial Electronics Society

      Volume: 5 Pages: 67-80

    • DOI

      10.1109/ojies.2024.3360509

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Optimization Framework of Reduction Gear for Construction Vehicle based on Tooth Profile Crowning2024

    • Author(s)
      Katiene Brice Clena Traore, Yasutaka Fujimoto, Shota Furukawa, Tetsu Nagata, Naoyuki Kawamura
    • Journal Title

      2024 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

      Volume: 1 Pages: 1-6

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Design and test of 3K planetary gear for electric vehicle2023

    • Author(s)
      Timur Hamraev, Almachius K. Kahwa, Yasutaka Fujimoto
    • Journal Title

      Journal of Advanced Mechanical Design, Systems, and Manufacturing

      Volume: 17 Issue: 6 Pages: JAMDSM0079-JAMDSM0079

    • DOI

      10.1299/jamdsm.2023jamdsm0079

    • ISSN
      1881-3054
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Implementation of Motion Intention Prediction to Highly Back-drivable Exoskeleton2023

    • Author(s)
      Kenichiro Mori, Yasutaka Fujimoto
    • Journal Title

      IECON 2023- 49th Annual Conference of the IEEE Industrial Electronics Society

      Volume: 1 Pages: 1-6

    • DOI

      10.1109/iecon51785.2023.10311650

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Compensation of Eccentircity for 98% Efficiency 2K-H Compound Planetary Reduction Gearbox2023

    • Author(s)
      Yuma Sakurai and Yasutaka Fujimoto
    • Journal Title

      proc. IEEJ Int. Workshop on Sensing, Actuation, Motion Control, and Optimization

      Volume: 1 Pages: 301-304

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Power Regeneration Mathematical Analysis and Gear Ratio Optimization of Geared Wind Powers2022

    • Author(s)
      Fuma Shimizu, Masato Koyama, Yasutaka Fujimoto, Kenta Nagano, Hiroshi Matsuki
    • Journal Title

      proc. IEEJ Int. Workshop on Sensing, Actuation, Motion Control, and Optimization

      Volume: -

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Evaluation of Torque-Sensorless Control for a Knee Exoskeleton Using Back-Drivable Actuators2022

    • Author(s)
      Kenichiro Mori and Yasutaka Fujimoto
    • Journal Title

      proc. IEEE International Conference on Advanced Motion Control

      Volume: - Pages: 323-328

    • DOI

      10.1109/amc51637.2022.9729262

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Hybrid 3K Compound Planetary Reduction Gearbox with a Roller Transmission Mechanism2021

    • Author(s)
      Satoru Oba and Yasutaka Fujimoto
    • Journal Title

      IEEE/ASME Trans. on Mechatronics

      Volume: - Issue: 4 Pages: 2356-2366

    • DOI

      10.1109/tmech.2021.3101236

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 偏心を考慮した効率98%のロボット用2K-H複合遊星歯車減速機の基礎検討2022

    • Author(s)
      櫻井友馬, 藤本康孝
    • Organizer
      電気学会産業応用部門大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 高効率減速機を用いた装着型膝関節アシストスーツの評価について2021

    • Author(s)
      森健一郎, 藤本康孝
    • Organizer
      電気学会産業計測制御研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 高減速複合遊星歯車機構を用いたロボットアームのための力制御手法の基礎検討2021

    • Author(s)
      永野健太, 下野誠通, 藤本康孝
    • Organizer
      電気学会産業計測制御研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Highly Backdrivable High-reduction-ratio Gearboxes for Robotic Actuators2021

    • Author(s)
      Yasutaka Fujimoto
    • Organizer
      IEEE/RSJ IROS Workshop: From Gears to Direct Drive: Recent Trends and Opportunities in Actuation
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2021-04-28   Modified: 2025-01-30  

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