A Novel Hybrid Analytical Model of Active Magnetic Bearing Considering Rotor Eccentricity and Local Saturation Effect

Cao, Zhi; Huang, Yunkai; Guo, Baocheng; Peng, Fei; Dong, Jianning; Hemeida, Ahmed

doi:10.1109/tie.2021.3102396

Cited by 16 publications

(9 citation statements)

References 18 publications

(28 reference statements)

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“…where, F xaa , F xbb , F yaa , F ybb are the electromagnetic force; k ia , k ib and k xa , k xb , k ya , k yb are current stiffness coefficient and displacement stiffness coefficient. According to (2), ( 3), ( 4), (5), one can obtain:…”

Section: Amb Rotor System Modelmentioning

confidence: 99%

“…[1][2][3] In recent years, AMB has been widely used in diverse high-performance applications such as flywheel energy storage systems, bearing less motors, artificial heart pumps, vacuum pumps, and numerical control machines. [4][5][6] During the widely application of AMB system, rotor position control is the key and basic issue. AMB is an unstable system because of the relationship between the electromagnetic force and the length of the air gap.…”

Section: Introductionmentioning

confidence: 99%

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Sliding model control of active magnetic bearing rotor system based on state observer

Li,

Ouyang,

et al. 2024

Advances in Mechanical Engineering

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This paper addresses a novel sliding mode control based on state observer for active magnetic bearing rotor system. Firstly, the state-space model of a radial AMB rotor system is established with considering unbalance disturbance and gyro effect for a vertical flywheel energy storage system. Then a sliding mode function and switching surface are constructed based on an observer. Meanwhile, a separation and decoupling strategy based on Finsler’s lemma is proposed. Through this method, the constraint relationship between the controller gain, active magnetic bearing matrices and the Lyapunov variables is eliminated. After that a method for chattering reduction in the sliding-mode controller is raised. Relied on these techniques, new sufficient conditions for the stability of AMB rotor system are given in the framework of linear matrix inequalities. Finally, the effectiveness of the proposed sliding mode controller is validated on the experimental platform of the flywheel energy storage system.

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Section: Amb Rotor System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sliding model control of active magnetic bearing rotor system based on state observer

Li,

Ouyang,

et al. 2024

Advances in Mechanical Engineering

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“…However, the proposed technique by Ostovic cannot consider the fringing and concentration of air-gap flux tubes. To remove these drawbacks, the cylindrical and pentagonal meshes have been used in air-gap region which lead to high computational load [16][17].…”

Section: Figure 7 22 Mec Model Of Air-gap Regionmentioning

confidence: 99%

An Accurate Magnetic Equivalent Circuit Model for Modeling and Analysis of Variable Reluctance Energy Harvesters

Rezaee‐Alam

2023

Scientia Iranica

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Variable reluctance energy harvester (VREH) is a good candidate of transducers to transform the environmental energy into electricity. VREHs act based on electromagnetic induction due to the variation of air-gap reluctance with the rotation of wheel. This paper presents an accurate analytical model based on magnetic equivalent circuit (MEC) model and conformal mappings (CMs) for electromagnetic modeling the VREHs, which have a large air-gap. The geometry of analyzed VREH on both sides of air-gap including the iron parts, slots, and permanent magnets (PMs) is divided into many elements in cylindrical coordinate, and each element is then replaced with an equivalent permeance model. The air-gap region is modeled with permeances calculated by the CM method, which can accurately consider the real paths of flux tubes in large air-gap.The obtained air-gap permeances are then used in MEC model for electromagnetic modeling and analysis of studied VREH, while considering the effects of slots and magnetic saturation, accurately. In final, the analytical results are verified by comparing with the corresponding results obtained through finite element method (FEM).

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“…The results show that the improved magnetic circuit model can predict the stiffness more accurately. To streamline the design and analysis of the AMB, a hybrid analysis model has been proposed [16]. This model employs elementary subdomains to model the stator and rotor, while the air gap is represented by equivalent magnetic circuits.…”

Section: Introductionmentioning

confidence: 99%

Analytical Model of Six-pole Axial-radial Active Magnetic Bearing Based on Flux Density and Segmentation of Magnetic Field

Zhu,

Wang,

Liu

2024

PIER M

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To reduce the coupling resulting from structural asymmetry and enhance the load-bearing capacity per unit area, a six-pole axial-radial active magnetic bearing (AR-AMB) has been suggested. To refine the precision of the mathematical model derived from the conventional equivalent magnetic circuit model, a modeling technique that employs flux density and magnetic field segmentation has been proposed. Firstly, the structure and operational principle of the six-pole AR-AMB are introduced. Subsequently, an improved model based on the flux density is established by considering the internal relationship between the iron core and air gap magnetic field in a magnetic bearing with pole shoes. The model addresses issues related to the accurate calculation of fringing magnetic flux and magnetic saturation of core materials while accounting for eddy current effects on suspension force. Finally, the accuracy of the theoretical analysis results has been validated through finite element simulation and experiment, and demonstrated that the rotor based on this model exhibits robust anti-interference capabilities.

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A Novel Hybrid Analytical Model of Active Magnetic Bearing Considering Rotor Eccentricity and Local Saturation Effect

Cited by 16 publications

References 18 publications

Sliding model control of active magnetic bearing rotor system based on state observer

Sliding model control of active magnetic bearing rotor system based on state observer

An Accurate Magnetic Equivalent Circuit Model for Modeling and Analysis of Variable Reluctance Energy Harvesters

Analytical Model of Six-pole Axial-radial Active Magnetic Bearing Based on Flux Density and Segmentation of Magnetic Field

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