一种离心式心脏泵磁悬浮系统的耦合特性  

Coupling Characteristics of Magnetic Levitation System in a Centrifugal Blood Pump

作　　者：刘建文[1] 郑懿[1] 王超慧[2] 孟祥茹[1] 姜飞[1] 

机构地区：[1]山东科技大学机械电子工程学院,山东青岛266590 [2]山东科技大学土木工程与建筑学院,山东青岛266590

出　　处：《机械工程师》2016年第6期14-17,共4页Mechanical Engineer

摘　　要：为实现一种离心式心脏泵的稳定磁悬浮,需研究该心脏泵的耦合特性。文中分析了径向永磁轴承和开关磁阻电机的耦合特性,导出磁悬浮转子径向运动方程以及干扰力与径向位移的传递函数;并根据永磁轴承磁场分布特性,提出一种基于霍尔传感器的磁悬浮转子位移检测方案;最后,分析了径向和轴向位移在霍尔传感器检测结果中的耦合关系,据此给出解耦方法,实现磁悬浮转子位移检测。研究表明,径向永磁轴承和开关磁阻电机混合磁悬浮控制有利于提高控制系统正刚度并降低电磁能耗,基于霍尔传感器的转子位移检测方案能准确描述磁感应强度检测中径向二自由度位移间的耦合关系。To achieve the stable levitation of a centrifugal blood pump, the coupling of blood pump should be studied. This paper studies on the coupling of radial permanent magnetic bearings and switched reluctance motors, and deduces the equation of radial motion and the transfer function of disturbing forces and radical displacements about the magnetic levitation rotor. Based on magnetic field characteristics of radial permanent magnetic bearings, the displacement measurement solution of magnetic levitation rotor using Hall sensors is presented. Finally we study the coupling relationship between axial displacements and radial displacements in the outputs of Hall sensors and provide a decoupling method according to the coupling relationship. And this decoupling method can achieve the displacement measurement of magnetic levitation rotor. Studies indicate that： hybrid magnetic levitation control of radial permanent magnetic hearings and switched reluctance motorsis conducive to improve positive stiffness of control system and reduce electromagnetic power consumption; and the displacement measurement solution of magnetic levitation rotor based on Hall sensors can accurately describe the coupling relationship between radial two degrees of freedom in the measurement of magnetic induction intensity.

关 键 词：人工心脏泵 径向永磁轴承 开关磁阻电机 耦合 位移检测 

分 类 号：TH133.3[机械工程—机械制造及自动化] R318.11[医药卫生—生物医学工程]