Electromagnetic Design of Bearingless Permanent Magnet Motor for Heart Pumps

To solve the stability problem of bearingless permanent magnet thin film motor rotor suspension for heart pumps, electromagnetic design and related simulation work of bearingless permanent magnet motor for heart pumps were carried out. First, electromagnetic schemes for radial electromagnetic active suspension and axial permanent magnet passive suspension were designed for the power source of heart pumps. Second, a bearingless permanent magnet thin film motor for heart pumps was designed based on the electromagnetic scheme, and electromagnetic simulation work was carried out using Maxwell. Finally, a bearingless permanent magnet thin film motor that meets the requirements was assembled with a centrifugal pump, and a heart pumps prototype was composed of sensors. The results indicate that the bearingless permanent magnet thin film motor designed in this paper for the heart pumps has good torque and suspension performance and can achieve stable suspension of the heart pumps rotor at 5 degrees of freedom. This design method has strong universality and flexibility, and its design ideas and simulation analysis process provide a reference for researchers in the field of the design of heart pumps.