Force control of humanrobot interaction using twin direct-drive motor system based on modal space design

Chowarit Mitsantisuk, Seiichiro Katsura, Kiyoshi Ohishi

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)


Future robot systems are required to focus on developing more flexible systems for use with human operator. These robots must operate more slowly and be more compliant to safe user interaction. This paper proposes an improved design methodology for the humanrobot interaction system. The main contribution of the work described in this paper is the design of dual disturbance observers combined with modal space design for the twin direct-drive motor system. Two of the same direct-drive motors are required and connected by wire rope mechanism. Since both direct-drive motors have almost the same value of the friction effect and other nonlinearities, it is easy for the proposed system to compensate these deterioration effects. The proposed force control system is independently controlled in acceleration dimension by realizing the system based on common mode and differential mode. In the common mode, it is utilized for control of vibration suppression and wire rope tension. Moreover, the bandwidth and the stiffness of mechanism can be regulated by changing the wire rope tension control. In the differential mode, the purity of human external force with compensation of friction force is obtained. This mode is useful for control of the interaction force of human. The effectiveness of the proposed method is verified by experimental results.

Original languageEnglish
Article number5229204
Pages (from-to)1383-1392
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number4
Publication statusPublished - 2010 Apr 1


  • Acceleration control
  • Disturbance observer
  • Environmental information
  • Haptics
  • Human interaction
  • Modal space design
  • Motion control
  • Sensorless force control

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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