新型永磁悬浮轴承在透平机及心脏泵中的应用  

Applications of novel permanent maglev bearings in turbine machines and heart pumps

作　　者：钱坤喜[1] 许自豪[1] 王颢[1] 王芳群[1] 

机构地区：[1]江苏大学生物医学工程研究所,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2011年第6期663-666,677,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(30900289)

摘　　要：为验证永磁悬浮轴承在旋转时能否实现转子的稳定悬浮,将自行设计的新型永磁悬浮轴承应用到透平机和离心式心脏泵中,并利用Hall传感器分别测量二者转子旋转时的偏心距,用速度传感器分别测量二者的旋转速度.发现当转速高于某一临界值(透平机为1 800 r.min-1,心脏泵为3 250 r.min-1),透平机和心脏泵的转子偏心距均会明显小于转子和定子的间隙0.15 mm,转子脱离了定子并保持了稳定悬浮.结果表明:高速旋转的悬浮体所具有的陀螺效应能够使永磁悬浮转子稳定平衡;在静止或转速很低的情况下,永磁悬浮转子不能保持稳定的旋转;一旦转速超过某一临界值,它就会获得陀螺效应并借此达到5自由度的稳定悬浮.To verify the stable suspending of passive magnetic bearing rotor during rotating,a novel self-designed passive magnetic bearing was applied in turbine machine and centrifugal heart pump.The rotating eccentricity and speed of rotors were measured by Hall sensors and speed sensors,respectively.The results show that when the rotating speed is higher than a critical value of 1 800 r·min-1 for turbine machine and 3 250 r·min-1 for heart pump,the rotor eccentricities were obviously smaller than 0.15 mm of the gap between rotors and stators,which indicates that the rotors disaffiliate from stators with stable suspension.High speed rotating levitator with so-called ″Gyro-effect″ can make passive maglev rotator stable.In static state or in the case of rotating speed lower than the critical value,the passive maglev rotator can not keep rotation stable.When the rotating speed is higher than the critical value,the passive magnetic levitator will have Gyro-effect and obtain stable suspension with five degrees of freedom.

关 键 词：永磁轴承 永磁悬浮 心脏泵 透平机 陀螺效应 

分 类 号：TH133.3[机械工程—机械制造及自动化]