A study on permanent magnet topologies for hybrid bearings for medical drives applied in Ventricular Assist Devices

Pohlmann, André; Hameyer, Kay

doi:10.2478/v10171-011-0032-5

Cited by 3 publications

(8 citation statements)

References 5 publications

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“…VADs should support the human heart by providing sufficient perfusion without causing blood and tissue damage during operation. Usually the left ventricle is preferred as it has higher pressure than the right ventricle [2]. Important types of blood damage are hemolysis, thrombogenicity, clotting, and denaturation.…”

Section: Methodsmentioning

confidence: 99%

“…Denaturation yields a deformation of biomolecular structure of proteins in the blood causing its destruction. Blood temperature increase may be caused by heat losses in active VAD components [2].…”

Section: Methodsmentioning

confidence: 99%

“…It is due to this issue that many patients die while waiting for a donor organ [1]. In order to sustain the patients' life, VAD can mechanically support the human heart to achieve a sufficient perfusion of the body [2].…”

Section: Introductionmentioning

confidence: 99%

“…It works passively and is contactless. Various permanent magnet topologies are studied and analyzed by FEM in terms of axial forces and stiffness [2]. In the literature [4] an axial-type self-bearing motor is proposed with a levitated rotor for a small blood pump.…”

Section: Introductionmentioning

confidence: 99%

“…As blood hemoglobin includes iron, there are some studies in the literature stating that the magnetic field has a negative impact on blood [6]. In the literature [2] a hybrid permanent magnet hydrodynamic bearing is designed. It works passively and is contactless.…”

Section: Introductionmentioning

confidence: 99%

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Design and analysis of a magnetically levitated axial flux BLDC motor for a ventricular assist device (VAD)

Fenercioğlu¹

2016

Turk J Elec Eng & Comp Sci

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This study presents the design of a magnetically levitated (maglev) axial magnetic flux brushless direct current motor (AF-BLDC) for an axial blood flow ventricular assist device (VAD). It has three phases, twelve salient stator poles, and eight rotor magnet poles. It is designed in miniature size. Twin AF-BLDC motors are placed in the VAD symmetrically and rotors are coupled to the pump from two sides. The stator and rotor of the proposed motor are designed with a hole since magnetic flux does not pass through the central part. Pump impellers may be placed in this hole for larger pump chamber volume and lower speed. The motor has a passive magnetic bearing and does not involve contact and friction to minimize blood damage. Bearing magnets ensure magnetic suspension. Axial magnetic fluxes are parallel to blood flow direction, thus minimizing penetration of magnetic field into blood. Magnetic parameters, axial pull force, and torque of the proposed motor have been analyzed by the 3-dimensional finite elements method (3D-FEM) to confirm the motor design. Solutions are compared with maglev and non-maglev designs.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design and analysis of a magnetically levitated axial flux BLDC motor for a ventricular assist device (VAD)

Fenercioğlu¹

2016

Turk J Elec Eng & Comp Sci

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Research on a Low Power Consumption Six-Pole Heteropolar Hybrid Magnetic Bearing

Jin

2013

IEEE Trans. Magn.

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Hydrodynamic Bearing Structural Design of Blood Pump Based on Axial Passive Suspension Stability Analysis of Magnetic–Hydrodynamic Hybrid Suspension System

et al. 2021

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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.

show abstract

A study on permanent magnet topologies for hybrid bearings for medical drives applied in Ventricular Assist Devices

Cited by 3 publications

References 5 publications

Design and analysis of a magnetically levitated axial flux BLDC motor for a ventricular assist device (VAD)

Design and analysis of a magnetically levitated axial flux BLDC motor for a ventricular assist device (VAD)

Research on a Low Power Consumption Six-Pole Heteropolar Hybrid Magnetic Bearing

Hydrodynamic Bearing Structural Design of Blood Pump Based on Axial Passive Suspension Stability Analysis of Magnetic–Hydrodynamic Hybrid Suspension System

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