Robust motor speed control under time varying loads in moving actuator type artificial heart (AnyHeart)

J. J. Lee, W. E. Kim, J. Choi, J. W. Park, J. Chung, K. Nam, S. K. Park, H. S. Son, K. Sun, Byoung Goo Min

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The Moving Actuator type artificial heart(AnyHeart) as well as many other artificial hearts uses a motor as its power source. For controllability of control parameters such as pump rate, pump output, blood pressure profile and flow form, the precise motor speed control is important. However, because the implantable device has limited carrying capacity of hardware components in size and number, applying diverse motor control methods are not possible. In addition, the existing PI (Proportional-Integral) motor controller does not show satisfactory performance. A new controller that is sufficiently robust for the changes of load and physical system parameters has been designed and tested. The robust speed controller is based on the sliding mode control method that is applicable to a system of which the ranges of uncertainty in physical parameters are known. In a mock circulation system test, the actual speed showed good tracking characteristics in respect to the reference speed. Fast follow-up characteristics were also observed under high afterload and speed conditions. The speed error, current and power consumption were reduced by about 40%. The proposed control technique overcomes the limitations of the PI controller, and makes important improvements in both performance and stability.

    Original languageEnglish
    Pages (from-to)787-795
    Number of pages9
    JournalInternational Journal of Artificial Organs
    Volume27
    Issue number9
    DOIs
    Publication statusPublished - 2004 Sep

    Keywords

    • AnyHeart
    • Moving actuator type artificial heart
    • Robust speed control
    • Sliding mode control

    ASJC Scopus subject areas

    • Bioengineering
    • Medicine (miscellaneous)
    • Biomaterials
    • Biomedical Engineering

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