Numerical and Experimental Analysis for a Magnetic Levitation System in a Hemocompatibility Assessment Platform.
Numerical and Experimental Analysis for a Magnetic Levitation System in a Hemocompatibility Assessment Platform.
复制标题
血液相容性评估平台中磁悬浮系统的数值和实验分析。
DOI：
10.1109/embc48229.2022.9870994
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Wang,Yaxin
中科院分区：
文献类型：
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作者：
Tedesco,Victor;Kiang,Simon;Karnik,Shweta;Smith,PAlex;Nissim,Lee;Fraser,KatherineH;Kurita,Nobuyuki;Frazier,OH;Wang,Yaxin
儿童左心室辅助装置 (LVAD) 的发展落后于成人 LVAD，主要是由于儿童解剖结构的尺寸和血液相容性限制。为了量化 LVAD 开发过程中血液创伤的来源，我们提出了一个血液相容性评估平台（HAP），可以评估 LVAD 各个组件的血液相容性。为了消除 HAP 本身引起的溶血，我们采用被动磁力 (PM) 轴承来径向悬挂转子，并采用主动磁力轴承 (AMB) 来控制轴向位置。在本研究中，我们对 2 种几何形状的 AMB 力进行了数值评估，并通过将其预测与实验结果进行比较来验证模型。通过将转子-定子间隙以 0.1 mm 的增量从 0.1 mm 增加到 0.5 mm，并以 1 A 的增量将线圈电流从 -2 A 改变到 2 A，来评估 AMB 产生的磁力。两种几何形状的数值模型的平均误差分别为 8.8% 和 7.0%。在较小（<0.2mm）的转子-定子间隙处发现较高的误差。对于两种偏置环尺寸，AMB 表现出从 -1 A 到 1 A 的高磁刚度，尽管它在 -2 A 和 2 A 的电流下饱和。该高电流刚度区域被确定为最佳控制区域。在未来的工作中，该功能将用于调整控制算法来调制提供给 AMB 的电流，最终稳定转子的轴向。临床相关性——这项工作进一步开发了血液相容性评估平台，该平台将增强和加速成人和儿童 LVAD 的开发。
Development of pediatric left ventricular assist devices (LVADs) has lagged behind that of adult LVADs, primarily due to the size and hemocompatibility constraints of pediatric anatomy. To quantify sources of blood trauma during LVAD development, we proposed a hemocompatibility assessment platform (HAP) that can evaluate the hemocompatibility of individual components of LVADs. To eliminate the hemolysis induced by the HAP itself, we incorporated passive magnetic (PM) bearings to suspend the rotor radially and an active magnetic bearing (AMB) to control the axial position. In this study, we numerically evaluated AMB forces of 2 geometries and validated the model by comparing its predictions with experimental results. The magnetic forces generated by the AMB were evaluated by increasing the rotor-stator gap from 0.1 mm to 0.5 mm with a 0.1 mm increment and by varying the coil current from −2 A to 2 A with a 1 A increment. The average error of the numerical models was 8.8% and 7.0% for the two geometries, respectively. Higher errors were found at smaller (<0.2mm) rotor-stator gaps. For both biasing ring sizes, the AMB exhibits high magnetic stiffness from −1 A to 1 A, though it saturates for currents of −2 A and 2 A. This region of high current stiffness was identified as the optimal control region. In future work, this function will be used to tune a control algorithm to modulate current supplied to the AMB, ultimately stabilizing the rotor axially. Clinical Relevance— This work furthers the development of a hemocompatibility assessment platform that will enhance and accelerate the development of adult and pediatric LVADs.