全置換型磁気浮上人工心臓への反発型永久磁石磁気軸受の組み込み

抄録

　A magnetically levitated total artificial heart has been developed. The device has a magnetic bearing and a motor stator at center of the device. The left and right impellers are connected with a rod through a center hole of the stator core. A magnetic bearing controls the axial position and tilting motion of the levitated impeller. The radial displacement of the impeller is restricted with a passive stability characteristic of the magnetic system. A repulsive permanent magnetic bearing is applied for improvement of the radial stiffness and its performance was evaluated. At the rotation speed of 2000 rpm and the flow rate of 5 L/min, the maximum radial displacement was suppressed from 0.39 mm to 0.25 mm by the repulsive permanent magnetic bearing.