Low-Cost and Compact Disposable Extracorporeal Centrifugal Blood Pump Utilizing a Homopolar Bearingless Switched Reluctance Slice Motor

The high biocompatibility and durability of disposable extracorporeal centrifugal blood pumps (CBPs) utilizing magnetic bearing or bearingless motor technology make them perfect for supporting cardiopulmonary circulation patients. However, the rotor incorporated in unit typically uses high-cost environmentally-unfriendly rare-earth permanent magnets (PMs), leading to economic environmental issues. This paper proposes a pump with PM-free impeller/rotor head 12/8 switched reluctance slice (BELSRM). Two axial-magnetized PM rings two iron are mounted symmetrically above below tips stator poles. biased flux generated by forms closed vertical circuit (homopolar circuit) rotor, providing passive stiffness large positioning forces independent angle. A three-dimensional (3D) finite element analysis (FEA) model was used evaluate support stiffness, current-force coefficient, rotational torque. prototype (BELSM) diameter 50 mm were fabricated. radial levitation rotation actively controlled displacement speed feedback control systems, respectively. mock circulatory loop filled 40wt% aqueous glycerol solution set performance proposed CBP. CBP provided maximum flow rate 4.59 L/min pressure 214.5 mmHg at 2300 rpm 2400 rpm,