Numerical and Experimental Approach to Characterize a BLDC Motor with Different Radial-gap to Improve Hemocompatibility Performance.
Numerical and Experimental Approach to Characterize a BLDC Motor with Different Radial-gap to Improve Hemocompatibility Performance.
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用于表征具有不同径向间隙的 BLDC 电机以提高血液相容性性能的数值和实验方法。
DOI：
10.1109/embc44109.2020.9175989
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Kurita,Nobuyuki
中科院分区：
文献类型：
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作者：
Wang,Yaxin;Karnik,Shweta;Smith,PAlex;Elgalad,Abdelmotagaly;Frazier,OH;Kurita,Nobuyuki
左心室辅助装置（LVAD）已越来越多地在临床上用于治疗心力衰竭患者。然而，溶血、泵血栓形成、感染和出血仍然是LVAD技术的主要限制。使用血液剪切应力装置（BSSD）评估LVAD血液相容性具有明显的优势，因为BSSD可以提供更好的实验平台，以开发可靠的、可量化的血液创伤试验，从而对LVAD设计进行迭代测试。在这项研究中，提出了一种BSSD，血液暴露时间短，没有密封或接触轴承，以减少测试平台造成的血液创伤。在BSSD中，增大气隙驱动电机对于避免高剪切应力至关重要;然而，它会显著降低电机扭矩，这可能导致驱动整个系统的力不足。为了评估和优化驱动电机的气隙，以确保足够的电机转矩以及血液接触时间和剪切应力的可接受范围，无刷直流（BLDC）电机的数值模型建立使用有限元法（FEM）在数值仿真软件COMSOL。实验结果验证了模型的正确性。然后对不同气隙的数值模型进行了转矩和转速常数变化的评价。最后，基于转矩和速度常数计算得到的曲线生成两个方程。确定电机性能和电机气隙之间的这些关系，将有利于发展一个适当的BLDC电机尺寸的BSSD，考虑在我们未来的工作中的设计限制。
Left ventricular assist devices (LVADs) have increasingly been used clinically to treat heart failure patients. However, hemolysis, pump thrombosis, infection and bleeding still persist as major limitations of LVAD technology. Assessing LVAD hemocompatibility using a blood shear stress device (BSSD) has clear advantages, as the BSSD could provide a better experimental platform to develop reliable, quantifiable blood trauma assays to perform iterative testing of LVAD designs. In this study, a BSSD was proposed with short blood exposure time and no seals or contact bearings to reduce blood trauma caused by the test platform. Enlarged air-gap drive motor in BSSD is essential to avoid high shear stress; however, it would significantly reduce the motor torque, which may result in inadequate force to drive the entire system. In order to evaluate and optimize the drive motor air-gap to ensure adequate motor torque as well as acceptable range for blood exposure time and shear stress, a numerical brushless DC (BLDC) motor model was established using finite element method (FEM) in numerical simulation software COMSOL. The model was first validated by the experimental results. Then numerical model with different air-gap was evaluated on the torque and speed constant changes. In the end, two equations were generated based on the curves derived from the torque and speed constant calculations. Determining these relationships between motor performance and motor air-gap will facilitate the development of an appropriate BLDC motor size for the BSSD, considering the design limitations in our future work.