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

Santra, Tapan; Roy, Debashis; Choudhury, and Amalendu Bikash

doi:10.2528/pierm16120602

Cited by 16 publications

(7 citation statements)

References 15 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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show abstract

“…Thus, the amplitude of flux density in +G direction is larger than the amplitude in the −G direction. According to Maxwell theory, a Maxwell force that is opposite to the gravity will be generated on the rotor surface [28]. If the above Maxwell force is set to be equal to the rotor gravity, then the rotor will be suspended in the equilibrium position without adding any suspension control currents.…”

Section: Principle Of Eliminating Rotor Gravity In the Gcwmgmentioning

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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“…Magnetic suspension bearing is a new type of support technology that uses non-contact magnetic force to stably suspend the rotor, and it has the advantages of no mechanical contact, no friction, no lubrication, long life, etc. [1][2][3]. It is widely used in satellite attitude control, flywheel energy storage [4,5], aerospace, high-speed machine tools, and vacuum ultra-clean [6].…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimization Design of Magnetic Bearing Based on Genetic Particle Swarm Optimization

Sun¹,

Yin²,

Ye³

et al. 2019

PIER M

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The performance of magnetic bearing is determined by its electromagnetic parameters and mechanical parameters. In order to improve the performance of hybrid magnetic bearing (HMB) to better meet the engineering requirements, which needs to be optimized, a multi-objective optimization method based on genetic particle swarm optimization algorithm (GAPSO) is proposed in this paper to solve the problem that the optimization objectives are not coordinated during the optimization design. By introducing the working principle of HMB, a mathematical model of suspension force is established, and its rationality is verified by the finite-element method. By optimization, the suspension force of the HMB is increased by 18.5%, and the volume is reduced by 22%. The optimization results show that the multi-objective optimization algorithm based on GAPSO can effectively improve the performance of HMB.

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

Cited by 16 publications

References 15 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

Multi-Objective Optimization Design of Magnetic Bearing Based on Genetic Particle Swarm Optimization

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