永磁磁浮叶轮在血泵内的偏心距测量及分析

为了消除叶轮血泵内的机械磨损、延长血泵的使用寿命，采用了永磁磁浮技术，并利用自制测试系统测量永磁磁浮叶轮在血泵内的位置，数据处理结果表明，血泵流量及转速达到一定值后叶轮便能实现悬浮，而且转速越高、流量越大、气隙越小血泵越稳定，即旋转叶轮的偏心距及振幅越小．此外，还证实两种常用的永磁轴承比作者研制的永磁轴承稳定性差．

Study on rotor eccentric distance in permanent maglev impeller blood pump

In order to avoid mechanical wear so that to achieve durability of impeller blood pump, passive magnetic bearing was applied to achieve permanent maglev of the rotor. The rotor position was measured by use of Hall sensors. The results demonstrate that the rotor will be suspended when the rotating speed and flow rate are large enough, and the eccentric distance is in inverse proportion to rotating speed and pump flow, but proportional to air-gap between the rotor and the stator. In addition it shows that the bearing developed by authors is superior to the two conventional bearings in achieving stability of the pump.