Optimal Design of Passive Permanent Magnet Bearings

Safaeian, Reza; Heydari, Hossein

doi:10.1109/iraniancee.2019.8786766

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…Moreover, the performance heavily depends on the surface condition. In case of predefined resting positions and unidirectional motion, pseudo-levitation as in magnetic bearings [7] can be applied by using permanent magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Co-Design and Control of a Magnetic Microactuator for Freely Moving Platforms

Olbrich

Schütz

Kanjilal

et al. 2020

The 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications

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A current goal for microactuators is to extend their usually small working ranges, which typically result from mechanical connections and restoring forces imposed by cantilevers. In order to overcome this, we present a bistable levitation setup to realise free vertical motion of a magnetic proof mass. By superimposing permanent magnetic fields, we imprint two equilibrium positions, namely on the ground plate and levitating at a predefined height. Energy-efficient switching between both resting positions is achieved by the cooperation of a piezoelectric stack actuator, initially accelerating the proof mass, and subsequent electromagnetic control. A trade-off between robust equilibrium positions and energy-efficient transitions is found by simultaneously optimising the controller and design parameters in a co-design. A flatness-based controller is then proposed for tracking the obtained trajectories. Simulation results demonstrate the effectiveness of the combined optimisation.

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Section: Introductionmentioning

confidence: 99%

Co-Design and Control of a Magnetic Microactuator for Freely Moving Platforms

Olbrich

Schütz

Kanjilal

et al. 2020

The 1st International Electronic Conference on Actuator Technology: Materials, Devices and Applications

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show abstract

“…In [18], a different approach for using reduced model instead of large order model for controlling axial active magnetic bearing is proposed. In [19], for the optimal use of magnetic materials in passive magnetic bearings, two modifications in a passive magnetic bearing structure are investigated. In [20], the position control problem for the active magnetic bearing suspension system under external disturbance is discussed.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimization and Analysis of Six-Pole Outer Rotor Hybrid Magnetic Bearing

Liu¹,

Ma²,

Zhu³

et al. 2022

PIER C

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The multi-objective optimization of the six-pole outer rotor hybrid magnetic bearing (OSHMB) not only solves the nonlinear and strong coupling problems of the three-pole magnetic bearing (THMB), but also makes the magnetic bearing structure more compact and improves the maximum bearing capacity. Firstly, the structure and working principle of the OSHMB are introduced, and the mathematical models of suspension forces are established by the Maxwell tensor method. Secondly, the key parameters of the OSHMB are multi-objective optimized, and an optimal set of parameters is obtained through the sensitivity analysis, constructing the response surface model, and the multiobjective optimization based on the genetic algorithm. Based on the optimal parameters, the force current characteristics and maximum carrying capacity of the OSHMB are analyzed. Finally, the experimental platform is built. The suspension experiments, anti-interference experiments, and load loading experiments are performed. It can be seen that the maximum bearing capacity of the OSHMB is about 9.6% higher than that of the SHMB.

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“…AMBs rely on the attraction between ferromagnetic materials and electromagnets (coils and iron cores), whereas PMBs rely on the repulsive force between permanent magnets and/or between the conductive surface and permanent magnets. Since PMBs use permanent magnets and do not require sensors and control circuits, they can be smaller than AMBs [13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Conical Spiral Flow Channel and Impeller Parameters on Flow Field and Hemolysis Performance of an Axial Magnetic Blood Pump

et al. 2022

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For a blood pump, the blood flow channel and impeller parameters directly affect the performance of the pump and the resulting blood circulation. The flow channel in particular has a great impact on the hydraulic performance of the pump (e.g., flow and pressure), which directly determines the overall performance of the blood pump. Traditional bearing-supported blood pumps can cause mechanical damage to blood cells, leading to hemolysis and thrombosis. In this study, therefore, we designed a conical spiral axial blood pump with magnetic levitation. The blood pump was supported by electrodynamic bearings in the radial direction and electromagnetic bearings in the axial direction. The impeller and the front and rear hubs were integrated to minimize blood stagnation and reduce the formation of thrombosis. The hub had a conical spiral flow channel design, which not only reduced the size of the impeller but also increased blood flow and pressure while meeting the design requirements. Computational fluid dynamics (CFD) analysis was used to analyze the flow field of the axial blood pump, a power function model was used to establish a hemolysis prediction model, and the particle tracking method was used to obtain the flow trajectories of individual blood cells, thereby predicting hemolysis-related performance of the blood pump. The simulation results showed that the main high shear stress area in the blood pump was located in the impeller inlet and the clearance between the top of the impeller and the inner chamber of the blood pump. When the hub taper angle of the blood pump was 0.72° and the clearance was 0.3 mm, the average hemolysis prediction value was 0.00216. This prediction value was smaller than that of traditional axial blood pumps. These findings can provide an important reference for the structural design of axial blood pumps and for reducing the hemolysis prediction value.

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Optimal Design of Passive Permanent Magnet Bearings

Cited by 3 publications

References 12 publications

Co-Design and Control of a Magnetic Microactuator for Freely Moving Platforms

Co-Design and Control of a Magnetic Microactuator for Freely Moving Platforms

Multi-Objective Optimization and Analysis of Six-Pole Outer Rotor Hybrid Magnetic Bearing

Effect of Conical Spiral Flow Channel and Impeller Parameters on Flow Field and Hemolysis Performance of an Axial Magnetic Blood Pump

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