Performance of a continuous flow ventricular assist device: magnetic bearing design, construction, and testing.
Performance of a continuous flow ventricular assist device: magnetic bearing design, construction, and testing.
复制标题
连续流心室辅助装置的性能：磁力轴承设计、构造和测试。
DOI：
10.1046/j.1525-1594.1998.06095.x
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发表时间：
1998
影响因子：
2.4
通讯作者：
Olsen,D
中科院分区：
文献类型：
--
作者：
Allaire,P;Hilton,E;Baloh,M;Maslen,E;Bearnson,G;Noh,D;Khanwilkar,P;Olsen,D
一种新型离心连续流心室辅助装置 CFVAD III 已开发出来，该装置是全磁悬浮轴承。它只有一个运动部件（叶轮），无接触（磁悬浮），结构紧凑，发热最小。外径2英寸的离心叶轮由永磁无刷直流电机驱动。本文讨论了该装置中磁力轴承的设计、构造、测试和性能。磁悬浮由入口侧磁轴承和出口侧磁轴承组成，每个磁轴承分为8个极段，用于控制轴向和径向位移以及角位移。磁力执行器由几种不同的材料组成，以最大限度地减小尺寸和重量，同时具有足够的负载能力来支撑叶轮上的力。磁力轴承采用 0.1 T 范围内的磁通水平。采用自感电子电路（无物理传感器）来确定叶轮位置并提供磁轴承控制回路所需的反馈控制信号。传感器的位置灵敏度约为 0.025 毫米。使用模态控制技术开发了分散式 5 轴控制器。每个轴都使用比例积分微分控制来悬浮磁力支撑的叶轮。
A new centrifugal continuous flow ventricular assist device, the CFVAD III, which is fully magnetic bearing suspended, has been developed. It has only one moving part (the impeller), has no contact (magnetic suspension), is compact, and has minimal heating. A centrifugal impeller of 2 inch outer diameter is driven by a permanent magnet brushless DC motor. This paper discusses the design, construction, testing, and performance of the magnetic bearings in the unit. The magnetic suspension consists of an inlet side magnetic bearing and an outlet side magnetic bearing, each divided into 8 pole segments to control axial and radial displacements as well as angular displacements. The magnetic actuators are composed of several different materials to minimize size and weight while having sufficient load capacity to support the forces on the impeller. Flux levels in the range of 0.1 T are employed in the magnetic bearings. Self sensing electronic circuits (without physical sensors) are employed to determine the impellar position and provide the feedback control signal needed for the magnetic bearing control loops. The sensors provide position sensitivity of approximately 0.025 mm. A decentralized 5 axis controller has been developed using modal control techniques. Proportional integral derivative controls are used for each axis to levitate the magnetically supported impeller.