Abstract
Rotor suspension stability is one of the important performance indexes of a blood pump and the basis of determining whether the blood pump can be used in a clinic. Compared with the traditional magnetic suspension system, a single-winding, bearingless motor has the advantages of a compact structure, simple control system and low power consumption. In this pursuit, the present study aimed to envisage and design the magnetic suspension system coupled with a single-winding bearingless motor and permanent magnet bearings, establish the theoretical models of axial force and electromagnetic torque, and calculate the stiffness of the magnetic suspension system at the equilibrium point. Addressing the problem of the negative axial stiffness of the magnetic suspension system being negative, which leads to the instability of the suspension rotor, the hydrodynamic bearing structure was proposed and designed, and the critical stiffness to realize the stable suspension of the rotor was obtained based on the stability criterion of the rotor dynamics model. The optimal structural parameters of the hydrodynamic bearing are selected by integrating various factors based on the solution of the Reynolds equation and a stiffness analysis. Furthermore, the vibration experiment results proved that the blood pump rotor exhibited a good suspension stability, and the maximum offset under the impact external fluid was no more than 2 μm.
Highlights
Heart failure is a common cardiovascular disease and implanting a blood pump is one of the effective ways to treat this kind of disease [1,2]
The rotor of the third-generation blood pump adopts a suspension support system that cancels the mechanical bearing structure, eliminates the blood damage caused by mechanical bearing, and has good blood compatibility [6,7]
The hybrid suspension system of the axial flux, single-winding, bearingless motor, permanent magnet bearing, and hydrodynamic bearing solves the problems of a complex structure, heavy weight and high energy consumption
Summary
Heart failure is a common cardiovascular disease and implanting a blood pump is one of the effective ways to treat this kind of disease [1,2]. The hybrid suspension system of the axial flux, single-winding, bearingless motor, permanent magnet bearing, and hydrodynamic bearing solves the problems of a complex structure, heavy weight and high energy consumption. The motor of the blood pump was an axial flux, bearingless, permanent, magnet-synchronous motor, which realized the rotation of the impeller in the form of single-winding structure, and cooperated with the permanent magnet bearing to ensure the stable suspension of the impeller in the pump casing. The motor of the blood pump was an axial flux, bearingless, permanent, magnet‐synchronous motor, which realized the rotation of the impeller in the form of single‐winding structure, and cooperated with the permanent magnet bearing to ensure the stable suspension of the impe(lale) r in the pump casing. FiFgiugruere2.2B. eBaerainrignlgelsesssmmotootroor fotfhteheblboloododpupmump:p(:a()aS) iSnignlgel‐ew-winidnidnigngbebaerainrignlgeslessms motootro; r(;b()bM) Motootrosrtsattaotro;r(;c()cR) Rotootrorwwithith HHalablabcahchararrarya.y
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