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Magnetic design for the PediaFlow ventricular assist device.

机译：PediaFlow心室辅助设备的磁性设计。

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This article describes a design process for a new pediatric ventricular assist device, the PediaFlow. The pump is embodied in a magnetically levitated turbodynamic design that was developed explicitly based on the requirements for chronic support of infants and small children. The procedure entailed the consideration of multiple pump topologies, from which an axial mixed-flow configuration was chosen for further development. The magnetic design includes permanent-magnet (PM) passive bearings for radial support of the rotor, an actively controlled thrust actuator for axial support, and a brushless direct current (DC) motor for rotation. These components are closely coupled both geometrically and magnetically, and were therefore optimized in parallel, using electromagnetic, rotordynamic models and fluid models, and in consideration of hydrodynamic requirements. Multiple design objectives were considered, including efficiency, size, and margin between critical speeds to operating speed. The former dependsupon the radial and yaw stiffnesses of the PM bearings. Analytical expressions for the stiffnesses were derived and verified through finite element analysis (FEA). A toroidally wound motor was designed for high efficiency and minimal additional negative radial stiffness. The design process relies heavily on optimization at the component level and system level. The results of this preliminary design optimization yielded a pump design with an overall stability margin of 15%, based on a pressure rise of 100 mm Hg at 0.5 lpm running at 16,000 rpm.
机译：本文介绍了一种新的儿科心室辅助设备PediaFlow的设计过程。该泵体现在磁悬浮涡轮动力设计中，该设计是根据对婴幼儿长期支持的要求而明确开发的。该程序需要考虑多种泵拓扑结构，从中选择了轴向混合流配置以进行进一步开发。磁性设计包括用于转子径向支撑的永磁（PM）无源轴承，用于轴向支撑的主动控制推力致动器以及用于旋转的无刷直流（DC）电动机。这些组件在几何和磁力上紧密耦合，因此，使用电磁，转子动力学模型和流体模型并考虑了流体动力学要求，对其进行了并行优化。考虑了多个设计目标，包括效率，尺寸以及关键速度与运行速度之间的余量。前者取决于PM轴承的径向和偏航刚度。通过有限元分析（FEA）得出并验证了刚度的解析表达式。环形绕线电机的设计具有很高的效率，并具有最小的附加负径向刚度。设计过程在很大程度上依赖于组件级别和系统级别的优化。初步设计优化的结果得出了一种泵设计，其整体稳定性裕度为15％，基于在16,000 rpm下运行的0.5 lpm时100 mm Hg的压力上升。

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