Effect of magnetic permeability, shearing length, and shear gap on magnetic flux density of the magnetorheological damper through finite element analysis

In this article, we present a numerical model of a magnetic abrasive finishing station, which was analyzed using the finite element method (FEM). The obtained results were compared with the real values measured on an experimental station of our own design. The prepared station had the option of adjusting the magnetic flux density inside the machining gap, the width of which could be changed from 10 to 30 mm. The maximum value of the magnetic flux density inside the air gap was 0.8 T. The real distribution of magnetic flux density in the finishing area was also analyzed. A design of experiment was carried out with the following variables: abrasive grain concentration, width of the machining gap, and process duration. The results are presented in the form of regression equations and characteristics for selected roughness parameters.

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Effect of Pole Shoe Design on Inclination Angle of Different Magnetic Fields in Permanent Magnet Machines

Energies ◽

10.3390/en14092437 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2437

Author(s):

Jonathan Sjölund ◽

Sandra Eriksson

Keyword(s):

Magnetic Field ◽

Finite Element Analysis ◽

Finite Element ◽

Field Strength ◽

Magnetic Flux ◽

Permanent Magnet ◽

Magnetic Circuit ◽

Magnetic Flux Density ◽

Element Analysis ◽

Inclination Angles

Electromagnetic modelling of electrical machines through finite element analysis is an important design tool for detailed studies of high resolution. Through the usage of finite element analysis, one can study the electromagnetic fields for information that is often difficult to acquire in an experimental test bench. The requirement for accurate result is that the magnetic circuit is modelled in a correct way, which may be more difficult to maintain for rare earth free permanent magnets with an operating range that is more likely to be close to non-linear regions for the relation between magnetic flux density and magnetic field strength. In this paper, the inclination angles of the magnetic flux density, magnetic field strength and magnetization are studied and means to reduce the inclination angles are investigated. Both rotating and linear machines are investigated in this paper, with different current densities induced in the stator windings. By proper design of the pole shoes, one can reduce the inclination angles of the fields in the permanent magnet. By controlling the inclination angles, one can both enhance the performance of the magnetic circuit and increase the accuracy of simpler models for permanent magnet modelling.

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Magnetic flux distribution modelling of magnetically-impelled arc butt-welding of steel tubes using finite-element analysis

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/09544062jmes1025 ◽

2008 ◽

Vol 222 (9) ◽

pp. 1783-1790 ◽

Cited By ~ 4

Author(s):

S Arungalai Vendan ◽

S Manoharan ◽

G Buvanashekaran ◽

C Nagamani

Keyword(s):

Finite Element ◽

Magnetic Flux ◽

Flux Density ◽

Welding Process ◽

Magnetic Flux Density ◽

Steel Tubes ◽

Element Analysis ◽

Butt Welding ◽

Miab Welding ◽

Flux Density Distribution

Magnetically-impelled arc butt-welding (MIAB) is a pressure-welding process. In this process, heat is generated prior to forging by an arc created between two clamped and aligned tubes. This arc rapidly rotates along the peripheral edges of the tubes to be welded due to the electromagnetic force resulting from the interaction of the arc current and the magnetic field in the gap. To be precise, the magnetic flux density is the significant parameter that governs the arc rotation and the weld quality. This paper presents a three-dimensional finite-element model to determine the magnetic flux density distribution in the MIAB welding process. The objective of this study is to perform a non-linear electromagnetic analysis using the finite-element package ANSYS, and to explore the interdependence of MIAB welding parameters such as gap size, exciting current in the coil, and coil position from the weld centre, which influence the electromagnetic force generated in the welding process and weld quality. The results of this analysis are verified with the available experimental data for steel tubes (outer diameter 50 mm and thickness 2 mm). The results obtained using finite-element analysis establish that the magnetic flux density distribution in the gap increases with increasing exciting current and decreasing gap size and coil position from the weld centre.

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Performance analysis of a semi-active suspension system using coupled CFD-FEA based non-parametric modeling of low capacity shear mode monotube MR damper

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/0954407018765899 ◽

2018 ◽

Vol 233 (5) ◽

pp. 1214-1231 ◽

Cited By ~ 4

Author(s):

Gurubasavaraju Tharehalli Mata ◽

Hemantha Kumar ◽

Arun Mahalingam

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Magnetic Flux ◽

Computational Fluid Dynamic ◽

Fluid Dynamic ◽

Parametric Modeling ◽

Magnetorheological Damper ◽

Shear Mode ◽

Element Analysis ◽

Non Parametric

In this work, an approach for formulation of a non-parametric-based polynomial representative model of magnetorheological damper through coupled computational fluid dynamics and finite element analysis is presented. Using this, the performance of a quarter car suspension subjected to random road excitation is estimated. Initially, prepared MR fluid is characterized to obtain a relationship between the field-dependent shear stress and magnetic flux density. The amount of magnetic flux induced in the shear gap of magnetorheological damper is computed using finite element analysis. The computed magnetic field is used in the computational fluid dynamic analysis to calculate the maximum force induced under specified frequency, displacement and applied current using ANSYS CFX software. Experiments have been conducted to verify the credibility of the results obtained from computational analysis, and a comparative study has been made. From the comparison, it was found that a good agreement exists between experimental and computed results. Furthermore, the influence of fluid flow gap length and frequency on the induced force of the damper is investigated using the computational methods (finite element analysis and computational fluid dynamic) for various values. This proposed approach would serve in the preliminary design for estimation of magnetorheological damper dynamic performance in semi-active suspensions computationally prior to experimental analysis.

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Analysis Of Eddy Current Loss Of IPMSM According To The Material Of Permanent Magnet

Turkish Journal of Computer and Mathematics Education (TURCOMAT) ◽

10.17762/turcomat.v12i6.1959 ◽

2021 ◽

Vol 12 (6) ◽

pp. 508-513

Author(s):

Byeong-Chul Lee Et.al

Keyword(s):

Finite Element Analysis ◽

Magnetic Flux ◽

Permanent Magnet ◽

Flux Density ◽

Eddy Current ◽

Eddy Current Loss ◽

Magnetic Flux Density ◽

Element Analysis ◽

Eddy Current Losses ◽

Current Loss

In order to reach the performance of the permanent magnet embedded rotor, the choice of magnet is very important. It must be thermally stabilized, and at this point, discussion of eddy current losses is necessary.To proceed with this study, a permanent magnet embedded synchronous motor used in the compressor currently being designed was selected. To derive the eddy current losses in the neodymium-magnets, current density was calculated through the equation. The eddy current loss was mathematically derived using the magnetic conductivity and residual magnetic flux density. Finally, comparative verification was performed through finite element analysis simulation. In this paper, eddy current losses in a N series magnet are mathematically analyzed and we perform comparative verification through simulation using finite element analysis. The Br value indicating the residual magnetic flux density is the lowest in N30 series and the largestin the N48 series. In the case of using the N30 series, the amount of magnetic flux that can be generated is low, so in order to increase the same output, the electric field must be increased by drawing more current from the stator winding. That is, the torque can be further increased. However, since the magnetic flux density experienced by the permanent magnet also increases, eddy current loss that may occur in the magnet eventually increases. There are also a method of using a split magnet to reduce eddy current losses. Inthe case of a permanent magnet holding a large residual magnetic flux density, the magnets loss is reduced, but there is a disadvantage that the price may be expensive. The losses in the permanent magnet are dissipated as heat. If the eddy current loss increases, the magnet demagnetizes, which in turn leads to a decrease in performance. In the selection of magnets, analysis of losses is essential.

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Finite-Element Analysis of the Magnetostatic Field of a Coaxial Magnetic Gear Device

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.764-765.289 ◽

2015 ◽

Vol 764-765 ◽

pp. 289-293

Author(s):

Yi Chang Wu ◽

Han Ting Hsu

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Magnetic Flux ◽

High Speed ◽

Field Analysis ◽

Element Analysis ◽

Magnetostatic Field ◽

Speed Reduction ◽

Dimensional Finite Element ◽

Magnetic Gear

This paper presents the magnetostatic field analysis of a coaxial magnetic gear device proposed by Atallah and Howe. The structural configuration and speed reduction ratio of this magnetic gear device are introduced. The 2-dimensional finite-element analysis (2-D FEA), conducted by applying commercial FEA software Ansoft/Maxwell, is performed to evaluate the magnetostatic field distribution, especially for the magnetic flux densities within the outer air-gap. Once the number of steel pole-pieces equals the sum of the pole-pair numbers of the high-speed rotor and the low-speed rotor, the coaxial magnetic gear device possesses higher magnetic flux densities, thereby generating greater transmitted torque.

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