Prototype Continuous Flow Ventricular Assist Device Supported on Magnetic Bearings.
Prototype Continuous Flow Ventricular Assist Device Supported on Magnetic Bearings.
复制标题
由磁力轴承支撑的原型连续流心室辅助装置。
作者：
P. Allaire;H. Kim;E. Maslen;D. Olsen;G. Bearnson
本文介绍了一个原型连续流泵（CFVAD 2）完全支持在磁轴承。在模拟的成人人体循环系统中测量了泵的性能。该泵在100 mm Hg的压差压头下以2，400 rpm的转速在水中输送6 L/min的流量。该泵由4个磁力轴承支撑：2个径向轴承和2个推力轴承。磁力轴承的优点是不需要润滑和大的操作间隙。描述了轴承的几何形状和其他特性。轴承参数，如负载能力和电流增益进行了讨论。在空气和水中运行期间测量轴承线圈电流。转子在不同方向上运行，以确定致动器电流增益。然后，这些值被用来估计在空气和水中作用在转子上的径向力和推力。发现的力水平比预期的要低得多，这使得下一个原型的尺寸大大减小。在原型泵中测量溶血水平，发现不表明对血细胞的损伤。
This article describes a prototype continuous flow pump (CFVAD2) fully supported in magnetic bearings. The pump performance was measured in a simulated adult human circulation system. The pump delivered 6 L/min of flow at 100 mm Hg of differential pressure head operating at 2,400 rpm in water. The pump is totally supported in 4 magnetic bearings: 2 radial and 2 thrust. Magnetic bearings offer the advantages of no required lubrication and large operating clearances. The geometry and other properties of the bearings are described. Bearing parameters such as load capacity and current gains are discussed. Bearing coil currents were measured during operation in air and water. The rotor was operated in various orientations to determine the actuator current gains. These values were then used to estimate the radial and thrust forces acting on the rotor in both air and water. Much lower levels of force were found than were expected, allowing for a very significant reduction in the size of the next prototype. Hemolysis levels were measured in the prototype pump and found not to indicate damage to the blood cells.