Calculation of Force Between Two Ring Magnets Using Adaptive Monte Carlo Technique With Experimental Verification

Santra, Tapan; Roy, Debashis; Yamada, S.

doi:10.2528/pierm16052101

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…There are two passive magnetic bearings at the upper and lower portions of the machine shaft. These passive bearings consist of two concentric cylindrical type axially polarized NdFeB permanent magnets [7,8]. The outer magnet is called stator magnet and the inner magnet called rotor magnet.…”

Section: Construction and Working Principle Of Hmbmentioning

confidence: 99%

A Low Bias Current Integral Type Optimal Control Scheme for a Hybrid Magnetic Bearing

Pusti¹,

Santra²,

Roy³

2019

PIER M

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This paper presents an application of integral type optimal control scheme for rotor positioning of a hybrid magnetic bearing (HMB) in one degree of freedom (1-DOF) using low bias current. It is observed that higher biasing current enhances the linearity and disturbance rejection capability but at a cost of higher copper loss in the actuator. So, selection of biasing in an HMB system is very crucial. In the proposed scheme the dc biasing current can be varied by adjusting the axial offset to the rotor magnet. Analysis has been conducted to achieve the optimal biasing current for better performance of the HMB. A prototype of the HMB system has been fabricated and tested which represents quite satisfactory axial vibration characteristics under low biasing current.

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Section: Construction and Working Principle Of Hmbmentioning

confidence: 99%

A Low Bias Current Integral Type Optimal Control Scheme for a Hybrid Magnetic Bearing

Pusti¹,

Santra²,

Roy³

2019

PIER M

Self Cite

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“…The finite element method has high calculation accuracy, but the calculation cycle is the longest. The magnetic-charge method, which can be solved easily with the numerical integration, is mainly used to calculate the magnetic field of the PMs' edges [24]. Fourier series decomposition using the harmonic model of a double Fourier series can accurately describe the magnetic field distribution of each part in machines.…”

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

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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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“…The crude MC method has high integration error and computational burden. Santra et al [11] carried out an adaptive Monte Carlo technique (AMC) to calculate the magnetic force, where the wastage in calculation is avoided using importance sampling. The sample density was optimally selected using Lagrangian method in the integration domain [12] in each iteration.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Passive Magnetic Force in a Radial Magnetic Bearing Using General Division Approach

Santra¹,

Roy²,

Choudhury³

2017

PIER M

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Abstract-This paper represents the force calculation in a radial passive magnetic bearing using Monte Carlo technique with general division approach (s-MC). The expression of magnetic force is obtained using magnetic surface charge density method which incurs a multidimensional integration with complicated integrand. This integration is solved using Monte Carlo technique with 1-division (1-MC) and 2-division (2-MC) approaches with a MATLAB programming. Analysis using established methods such as finite element method (FEM), semi-analytical method, and adaptive Monte Carlo (AMC) method has been carried out to support the proposed technique. Laboratory experiment has been conducted to validate the proposed method. 2-MC gives better result than 1-MC. The computation time of the proposed method is compared with the quadrature method, FEM and AMC. It is observed that the proposed method invites less computational burden than those methods as the algorithm adaptively traverses the domain for promising parts of the domain only, and all the elementary regions are not considered with equal importance.

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Calculation of Force Between Two Ring Magnets Using Adaptive Monte Carlo Technique With Experimental Verification

Cited by 6 publications

References 12 publications

A Low Bias Current Integral Type Optimal Control Scheme for a Hybrid Magnetic Bearing

A Low Bias Current Integral Type Optimal Control Scheme for a Hybrid Magnetic Bearing

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

Calculation of Passive Magnetic Force in a Radial Magnetic Bearing Using General Division Approach

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