Document Detail

Robust motor speed control under time varying loads in moving actuator type artificial heart (AnyHeart).
MedLine Citation:
PMID:  15521219     Owner:  NLM     Status:  MEDLINE    
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.
J J Lee; W E Kim; J Choi; J W Park; J Chung; K Nam; S K Park; H S Son; K Sun; B G Min
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The International journal of artificial organs     Volume:  27     ISSN:  0391-3988     ISO Abbreviation:  Int J Artif Organs     Publication Date:  2004 Sep 
Date Detail:
Created Date:  2004-11-03     Completed Date:  2005-02-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7802649     Medline TA:  Int J Artif Organs     Country:  Italy    
Other Details:
Languages:  eng     Pagination:  787-95     Citation Subset:  IM    
Interdisciplinary Program in Medical and Biological Engineering Major, Graduate School Department of Biomedical Engineering, Seoul National University, Seoul, Korea.
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MeSH Terms
Blood Pressure
Cardiac Output
Electric Power Supplies*
Heart Rate*
Heart, Artificial*
Models, Cardiovascular
Prosthesis Design

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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