Integrated Design and Optimization Method of an Asymmetric Hybrid Thrust Magnetic Bearing With Secondary Air-Gap

Ren, Xiaojun; Le, Yun; Wang, Chune

doi:10.2528/pierb17060102

Cited by 2 publications

(3 citation statements)

References 28 publications

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“…According to the symmetry of the magnetic field, the general solutions of Eqs. (5) and (6) in polar coordinates are as follows:…”

Section: Analytical Model In the Outer Air Gapmentioning

confidence: 99%

“…Magnetic bearings are high-performance bearings that use magnetic force to suspend the rotor in space without mechanical contact between the rotors and the stators [6,7]. At present, the most widely structures of magnetic bearings are mainly composed of three types: passive magnetic bearings, active magnetic bearings and hybrid magnetic bearings [8,9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analytical Model of the Magnetic Field Distribution of a Generator Combined With Magnetic Bearing in Wind Turbines

Yu¹,

Xiang²,

Zhang³

et al. 2018

PIER B

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To achieve radial suspension and eliminate the effect of rotor gravity in wind turbines, a novel structure of a generator combined with a magnetic bearing (GCWMB) is proposed in this paper. The GCWMB not only has the characteristics of the traditional permanent magnet (PM) generator but also has the advantages of reducing friction and starting wind speed, eliminating rotor gravity. The structure and principle of the GCWMB are analyzed in this paper. To improve the calculation accuracy of flux density, an analytical model based on the Fourier series decomposition is proposed to establish the model of flux density in the outer air gap. Taking into account the edge effects and the eccentricity of the rotor, an improved equivalent magnetic circuit method is adopted to model and analyze the flux density in the inner air gap. The effectiveness and correctness of the proposed analytical model in the outer and inner air gaps are verified by finite element analysis (FEA) and experiments.

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“…According to the symmetry of the magnetic field, the general solutions of Eqs. (5) and (6) in polar coordinates are as follows:…”

Section: Analytical Model In the Outer Air Gapmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analytical Model of the Magnetic Field Distribution of a Generator Combined With Magnetic Bearing in Wind Turbines

Yu¹,

Xiang²,

Zhang³

et al. 2018

PIER B

View full text Add to dashboard Cite

show abstract

“…Finite element analysis (FEA), especially 3D, offers a precise solution of the magnetic field distribution in electromagnetic devices, albeit its main disadvantage is time-consuming calculations (Wajnert and Tomczuk, 2017). Therefore, magnetic equivalent circuits (MECs) also called reluctance network models are still used in the design of electromagnetic devices (Pollanen et al , 2005; Li et al , 2008; Gieras et al , 2011), especially within optimization procedures (Waindok and Piekielny, 2016; Ren et al , 2017; Lee et al , 2018). In the paper (Pollanen et al , 2005), the MEC of an active magnetic bearing is presented, which factors in saturation of magnetic materials and leakage flux paths between poles of the stator.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear magnetic equivalent circuit of the hybrid magnetic bearing

Wajnert

Tomczuk

2019

COMPEL

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Purpose The purpose of this paper is to create a reliable nonlinear magnetic equivalent circuit (NMEC) of the hybrid magnetic bearing (HMB). Commonly used magnetic equivalent circuits of HMB omit a saturation effect of the magnetic material as well as the leakage and fringing flux. It results in imprecise modelling of the magnetic field distribution. On the other hand, only 3D finite element analysis (FEA) can be used to precisely simulate the magnetic field in this type of the magnetic bearing. The proposed NMEC incorporates the saturation effect of the magnetic material, as well as the leakage and fringing flux. Design/methodology/approach The magnetic equivalent circuit of presented HMB is proposed to obtain a reliable model that ensures short calculation time. Developed NMEC incorporates the phenomena as the saturation effect, as well as the leakage and fringing flux. The reluctance of the air gap that includes the fringing flux was calculated using 3D FEA. Kirchhoffs’ laws were used to create a set of nonlinear equations that were iteratively solved by Broyden’s method. Findings Incorporating into NMEC of the HMB a saturation effect of the magnetic material, as well as the leakage and fringing flux, resulted in the accurate model that was in good agreement with 3 D finite element model and the real object. The developed NMEC offers the calculation time in the range of miliseconds, therefore can be successfully used in the engineering design instead of the FEM. Originality/value Presented NMEC can be considered as a fundamental model that can be successfully used for accurate and fast simulation of the HMB. Proposed NMEC includes considerable factors that decide about the model accuracy such as the saturation effect of the ferromagnetic material and the leakage and fringing flux. The developed NMEC can be used in the optimization procedures and for simulations of dynamic responses.

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Integrated Design and Optimization Method of an Asymmetric Hybrid Thrust Magnetic Bearing With Secondary Air-Gap

Cited by 2 publications

References 28 publications

Analytical Model of the Magnetic Field Distribution of a Generator Combined With Magnetic Bearing in Wind Turbines

Analytical Model of the Magnetic Field Distribution of a Generator Combined With Magnetic Bearing in Wind Turbines

Nonlinear magnetic equivalent circuit of the hybrid magnetic bearing

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