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Parameter estimation and actuator characteristics of hybrid magnetic bearings for axial flow blood pump applications.

机译：用于轴流血泵应用的混合电磁轴承的参数估计和执行器特性。

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摘要

Axial flow blood pumps are generally smaller as compared to centrifugal pumps. This is very beneficial because they can provide better anatomical fit in the chest cavity, as well as lower the risk of infection. This article discusses the design, levitated responses, and parameter estimation of the dynamic characteristics of a compact hybrid magnetic bearing (HMB) system for axial flow blood pump applications. The rotor/impeller of the pump is driven by a three-phase permanent magnet brushless and sensorless motor. It is levitated by two HMBs at both ends in five degree of freedom with proportional-integral-derivative controllers, among which four radial directions are actively controlled and one axial direction is passively controlled. The frequency domain parameter estimation technique with statistical analysis is adopted to validate the stiffness and damping coefficients of the HMB system. A specially designed test rig facilitated the estimation of the bearing's coefficients in air-in both the radial and axial directions. Experimental estimation showed that the dynamic characteristics of the HMB system are dominated by the frequency-dependent stiffness coefficients. By injecting a multifrequency excitation force signal onto the rotor through the HMBs, it is noticed in the experimental results the maximum displacement linear operating range is 20% of the static eccentricity with respect to the rotor and stator gap clearance. The actuator gain was also successfully calibrated and may potentially extend the parameter estimation technique developed in the study of identification and monitoring of the pump's dynamic properties under normal operating conditions with fluid.
机译：与离心泵相比，轴流血泵通常较小。这是非常有益的，因为它们可以在胸腔中提供更好的解剖结构，并降低感染的风险。本文讨论了用于轴向流血泵应用的紧凑型混合磁力轴承（HMB）系统的动态特性的设计，悬浮响应和参数估计。泵的转子/叶轮由三相永磁无刷无传感器电机驱动。它由两端的两个HMB悬浮在五个自由度上，并带有比例积分微分控制器，其中主动控制四个径向方向，而被动控制一个轴向方向。采用统计分析的频域参数估计技术验证了HMB系统的刚度和阻尼系数。专门设计的测试设备有助于估算径向和轴向空气中的轴承系数。实验估计表明，HMB系统的动力学特性主要取决于频率相关的刚度系数。通过将多频激励力信号通过HMB注入到转子，在实验结果中注意到，最大位移线性工作范围是相对于转子和定子间隙的静态偏心率的20％。执行器增益也已成功校准，并可能扩展了在正常工作条件下使用流体对泵的动态特性进行识别和监控的研究中开发的参数估计技术。

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