Modeling and Control of a Magnetic Bearing System for the Magnetically Suspended Centrifugal Blood Pump

Author:

Kim H.1,Kim H.C.2

Affiliation:

1. Interdisciplinary Program, Biomedical Engineering Major, Graduate School

2. Department of Biomedical Engineering, College of Medicine, and Institute of Medical and Biological Engineering, MCR, Seoul National University, Seoul - Korea

Abstract

We have developed a centrifugal blood pump with a magnetically suspended impeller to reduce the hemolysis level for long-term use. The main advance we have made was simplifying the traditional 5 axes controlled magnetic bearing system, since the total device should ultimately be small enough to implant into a human body. A simplified magnetic bearing system with only 3 actively controlled axes was designed to levitate the impeller. The state equations of the magnetic bearing plant were established using Lagrange's methods, and using the results, a linear quadratic optimal controller was designed to regulate the position of the impeller. Flow rate and differential pressure of 5L/min and 300mmHg, respectively at a motor speed of 2750 rpm was achieved from a mock circulation setup. These results show satisfactory performance as a cardiopulmonary bypass device. The lowering of pumping efficiency as the clearance between the impeller and pump housing increased was negligible. Thus for power efficiency, the smallest gap not leading to a hemolysis level rise can be determined as a feasible operation clearance.

Publisher

SAGE Publications

Subject

Biomedical Engineering,Biomaterials,General Medicine,Medicine (miscellaneous),Bioengineering

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Controllability of Radial Magnetic Bearing;Procedia Technology;2016

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