Use of motor current in flow rate measurement for the magnetically suspended centrifugal blood pump.
Use of motor current in flow rate measurement for the magnetically suspended centrifugal blood pump.
复制标题
使用电机电流测量磁悬浮离心血泵的流量。
作者：
T. Tsukiya;T. Akamatsu;K. Nishimura;T. Yamada;T. Nakazeki
研究了利用驱动电机电流间接测量离心血泵流量的方法。在不存在由不确定的机械接触摩擦引起的能量损失的情况下，在给定的电动机速度下，泵流量可以表示为电动机电流的函数。由京都大学和NTN公司合作开发的磁悬浮离心血泵（MSCP），适用于这种测量方法的应用，因为叶轮是磁性悬浮在泵壳内，没有任何机械接触。详细研究了流体粘度对泵性能的影响，在已知工作流体运动粘度的情况下，通过监测电机电流和转速，可以准确地估计泵的流量和通过泵的压差（从进口到出口）。工作流体的运动粘度也可以用MSCP测量。在慢性动物实验中监测电机电流和电机速度，估计的流速和压差与直接测量的数据显示出良好的相关性。
Indirect measurement of the flow rate of a centrifugal blood pump using the driving motor current was studied. The pump flow rate can be expressed as a function of the motor current under a given motor speed in the absence of energy loss resulting from uncertain mechanical contact friction. The magnetically suspended centrifugal blood pump (MSCP), developed by the collaboration of Kyoto University and NTN Inc., was suitable for the application of this measuring method because the impeller is suspended magnetically inside the pump housing without any mechanical contact. The effect of fluid viscosity on the pump performance was investigated in detail, and it was possible to estimate the pump flow rate and the pressure difference through the pump (from inlet port to outlet port) accurately by monitoring the motor current and speed when the kinematic viscosity of working fluids was known. The kinematic viscosity of working fluids can also be measured with the MSCP. The motor current and motor speed were monitored in a chronic animal experiment, and the estimated flow rate and pressure difference showed good correlation with directly measured data.