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, Ho Sung Son, Kyung Sun, Byoung Goo Min

Research output: Contribution to journalArticle

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
Publication statusPublished - 2004 Sep 1

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Keywords

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

ASJC Scopus subject areas

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

Cite this

Lee, J. J., Kim, W. E., Choi, J., Park, J. W., Chung, J., Nam, K., Park, S. K., Son, H. S., Sun, K., & Min, B. G. (2004). Robust motor speed control under time varying loads in moving actuator type artificial heart (AnyHeart). International Journal of Artificial Organs, 27(9), 787-795.