High Power Series Elastic Actuator Development for Torque-Controlled Exoskeletons

  • Mehmet C. Yildirim
  • Ahmet Talha Kansizoglu
  • Polat Sendur
  • Barkan UgurluEmail author
Conference paper
Part of the Biosystems & Biorobotics book series (BIOSYSROB, volume 22)


This paper presents the development procedures of a high power series elastic actuator that can be used in torque-controlled exoskeleton applications as a high-fidelity torque source. In order to provide a high torque output while containing its weight, the main objective was to satisfy dimensional and weight requirements within a compact structure. A three-fold design approach was implemented: (i) The torsional spring was designed using finite element analyses and its stiffness profile was experimentally tested via a torsional test machine, (ii) thermal behavior of the actuator was experimentally examined to ensure sufficient heat dissipation, (iii) the fatigue life of the spring was computed to be 9.5 years. Having manufactured the actuator, preliminary torque-control experiments were conducted. As the result, a high-fidelity torque control was achieved with a control bandwidth of up to 12 Hz.


  1. 1.
    Paluska, D., Herr, H.: The effect of series elasticity on actuator power and work output: implications for robotic and prosthetic joint design. Robot. Auton. Syst. 54(8), 667–673 (2006)CrossRefGoogle Scholar
  2. 2.
    Yildirim, M.C., Sendur, P., Bilgin, O., Gulek, B., Yapici, G.G., Ugurlu, B.: An integrated design approach for a series elastic actuator: stiffness tuning, fatigue tests, thermal management. In: Proceedings of the IEEE International Conference on Humanoid Robots, pp. 384–389, UK (2017)Google Scholar
  3. 3.
    Negrello, F., Garabini, M., Catalano, M.G., Malzahn, J., Caldwell, D.G., Bicchi, A., Tsagarakis, N.G.: A modular compliant actuator for emerging high performance and fall-resilient humanoids. In: Proceedings of IEEE Conference on Humanoid Robotics, Seoul, Korea, pp. 414–420 (2015)Google Scholar
  4. 4.
    Ugurlu, B., Oshima, H., Narikiyo, T.: Lower body exoskeleton-supported compliant bipedal walking for paraplegics: how to reduce upper body effort. In: Proceedings of IEEE International Conference on Robotics and Automation, Hong Kong, pp. 1354–1360 (2014)Google Scholar
  5. 5.
    Oh, S., Kong, K.: High precision robust force control of a series elastic actuator. IEEE/ASME Trans. Mechatron. 22(1), 71–80 (2017)CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Mehmet C. Yildirim
    • 1
  • Ahmet Talha Kansizoglu
    • 1
  • Polat Sendur
    • 1
  • Barkan Ugurlu
    • 1
    Email author
  1. 1.Department of Mechanical EngineeringOzyegin UniversityIstanbulTurkey

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