3D Magnetic Analysis of Permanent Magnets in Spherical Configuration

Öner, Yusuf; Kesler, Selami

doi:10.5370/jeet.2016.11.1.093

Cited by 2 publications

(1 citation statement)

References 32 publications

(28 reference statements)

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“…The nutation disk is supported by a spherical magnetic bearing that is located in the spherical cavity between the upper and lower covers and is nutated together with the nutation disk. As a result of the technical difficulties in the processing and magnetization of the spherical permanent magnets, it is difficult to implement the magnetic suspension of the spherical bearing directly using spherical permanent magnets with homogeneous magnetization [27]. Therefore, the permanent magnets of the spherical bearing are designed as magnetic fan-shaped sleeves that are inserted into the spherical pairs of the nutation disk and the spherical cavities of the upper and lower covers.…”

Section: A Structure and Mechanismmentioning

confidence: 99%

Design and Implementation of a Novel Passive Magnetically Levitated Nutation Blood Pump for the Ventricular-Assist Device

et al. 2019

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Considering the wear in mechanical bearings and the requirement for sensors or electrical power in active magnetic bearings, a novel nutation blood pump using a passive magnetic spherical bearing was developed in this paper. A mathematical model was derived to calculate the magnetic forces of the bearing between two pairs of magnetic sleeves in the nutation process. The calculation results demonstrate that the fluctuations of magnetic forces enlarge with the increase in the nutation angle; the magnetic forces obviously increase with the decrease in the air gap, especially along the z-axis. The dynamic magnetic finite element simulation was carried out to validate the mathematical model. The simulation and calculation results of the magnetic forces show consistent trends and provide a theoretical basis for the parameter design. To validate the performance of the pump, computational fluid dynamics (CFD) analyses and in vitro experiments were conducted. The predicted values of the flow velocity vector through the pump, and the wall shear stress, demonstrate that the pump has an antithrombotic property and would not cause serious blood damage. The hydraulic experiment shows that a pressure rise can be achieved in the range of 60-140 mmHg, at a rotational speed of 600-1600 rpm and a flow rate of 0.4-6.7 L/min. The normalized index of hemolysis (NIH) of the nutation pump was 0.0043 ± 0.0008 g/100L. The in vitro tests indicate the feasibility of a magnetically levitated ventricular-assist nutation blood pump for further suspension stability and animal trials.

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Section: A Structure and Mechanismmentioning

confidence: 99%