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System Analysis of the Flow/Pressure Response of Rotodynamic Blood Pumps
Author(s) -
Smith William A.,
Goodin Mark,
Fu Minghua,
Xu Longya
Publication year - 1999
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1046/j.1525-1594.1999.06309.x
Subject(s) - impeller , control theory (sociology) , torque , power (physics) , electronic speed control , operating point , constant (computer programming) , flow (mathematics) , engineering , computer science , automotive engineering , mechanical engineering , control (management) , mechanics , physics , electrical engineering , quantum mechanics , artificial intelligence , thermodynamics , programming language
Design of a rotodynamic blood pumping system to have a suitable, controllable output is a key configuration issue. This study evaluates the benefits of selecting the impeller running specific speed, motor speed‐torque line, and pump operating logic to jointly combine into a suitable characteristic. In this study, a “constant” flow for a given choice of control parameter value was the selected objective. The operating condition selected for analysis was chosen to be typical of an implanted, chronic support pump. Open‐loop operation, fixed torque, fixed power, and fixed power/rpm 2 ratio were combined with choices of impeller diameter and speed and motor speed‐torque line. It was found that setting the running specific speed at a higher value than that associated with the best efficiency point resulted in a much more controllable pump. Overall efficiency was only slightly penalized for the model impeller chosen. Power/rpm 2 control followed by torque control were most effective. With these control modes, motor characteristics were not critical.