Analytical Stiffness Calculation for Permanent Magnetic Bearings With Soft Magnetic Materials

Jungmayr, Gerald; Marth, Edmund; Amrhein, Wolfgang; Berroth, Hans-Joerg; Jeske, Frank

doi:10.1109/tmag.2014.2310437

Cited by 40 publications

(28 citation statements)

References 10 publications

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“…In [16], the calculation equations of the force and stiffness in axially, radially, and perpendicularly polarized of multipaired permanent magnet rings were deduced, by means of the Coulomb model and the vector method, and structures were evaluated in MATLAB and the bearing characteristics were discussed. In [17], the axial-radial stiffness ratio of the geometric structure of PMBs 2 Mathematical Problems in Engineering was analyzed by finite element method which is based on the magnetic charge method. And the results were applied to PMBs of magnetic suspension fan.…”

Section: Introductionmentioning

confidence: 99%

Design, Analysis, and Experiment of Multiring Permanent Magnet Bearings by Means of Equally Distributed Sequences Based Monte Carlo Method

Zhang

et al. 2019

Mathematical Problems in Engineering

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Load-carrying capacity analysis is an important procedure for designing the permanent magnet bearing (PMB). Generally, the magnetic force exerted between the ring magnets of PMB can be modeled by means of the equivalent magnetic charge method. In this case, the analytical methods are always simply compared to numerical methods; however, they are restricted by their applicability. The model based on the equivalent magnetic charge method contains multiple integrals; it is difficult to get the simulation results quickly through self-contained function of MATLAB. The equally distributed sequences based Monte Carlo method is used to simplify the complicated mathematical derivation and calculus of bearing capacity characteristics of multiring PMBs, and it might improve the computational efficiency of PMB structure design. The results of the Monte Carlo model are compared with the results of finite element analysis (FEA) using ANSYS, and the error correction factor is presented. The theoretical model is verified by the finite element analysis. Finally, the bearing forces in radial and axial directions of the PMBs with 4 pairs of magnetic rings were tested experimentally; the experiment result is approximately agreed with the simulation analysis. This method will be perfect for the engineering application involving multiring structural design of PMBs.

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Section: Introductionmentioning

confidence: 99%

Design, Analysis, and Experiment of Multiring Permanent Magnet Bearings by Means of Equally Distributed Sequences Based Monte Carlo Method

Zhang

et al. 2019

Mathematical Problems in Engineering

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“…As shown in a previous article Dehez, 2015 and2017), the curvature effect can be neglected by considering topologies with R e > 2b + g where R e is the mean radius of the air gap. The back-iron can be modelled by the method of image charges (Plonsey, 1961) (Jungmayr, Marth, Amrhein, Berroth and Jeske, 2014) as shown in Fig. 5, considering infinite the magnetic permeability of the back-iron.…”

Section: Modellingmentioning

confidence: 99%

“…Topologies with (Sotelo, de Andrade and Ferreira, 2007) or without (Yoo, Kim, Kim, Lee, Bae, and Noh, 2011) soft magnetic materials are studied in the literature. The use of highly permeable material (back-iron) increases the performance of PM bearings for a same PM volume (Jungmayr, Marth, Amrhein, Berroth and Jeske, 2014).…”

Section: Introductionmentioning

confidence: 99%

Comparison between optimized topologies of permanent magnet thrust bearings with back-iron

Beneden

Kluyskens

Dehez

2017

Mechanical Engineering Journal

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This paper deals with the optimization and the comparison of passive magnetic thrust bearings made up of radial stacks of permanent magnet rings. Various topologies are considered, depending on the polarization direction of the permanent magnet rings and the presence of back-iron. The coulombian approach and the method of image charges are used to determine the load capacity of topologies with back-iron. On this basis each topology is optimized in order to minimize the permanent magnet volume for a fixed load capacity, airgap thickness and remanent flux density. Varying these parameters, scaling laws of the optimum permanent magnet ring dimensions are derived to allow fast sizing and comparison of the topologies. The latter highlights that the topology with Halbach configuration and back-iron is the most performant, but that the topology with axial polarization is almost as good.

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“…The radial bearings are realized by axially magnetized NdFeB rings. As a consequence of the stable forces in radial direction the axial direction is unstable [11]. Therefore an active axial magnetic bearing is necessary.…”

Section: General System Descriptionmentioning

confidence: 99%

Design and optimization of a special magnetic levitated drive with unbalance robustness

Proll

Jungmayr

Marth

et al. 2015

2015 IEEE 11th International Conference on Power Electronics and Drive Systems

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This paper deals with the design of a passively damped magnetic bearing system in a special construction form powered by a BLDC Motor. Special attention was given to the optimization of the mechanical system in order to minimize oscillation amplitudes due to unbalanced excitation and decay times. In addition, the main components of the presented drive, the magnetic bearings and the BLDC-motor, were optimized for the determined construction space. The internal rotor is stabilized with passive magnetic bearings in radial and tilt directions and by an active magnetic bearing in axial direction. For the damping of the system, the stator is supported by elastomer rings. These damping elements lead to a significant reduction of rotor vibration, because the passive magnetic bearings show negligible damping. Rotor-dynamic effects were examined at the built magnetic bearing system and the theoretical models were verified.I.

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Analytical Stiffness Calculation for Permanent Magnetic Bearings With Soft Magnetic Materials

Cited by 40 publications

References 10 publications

Design, Analysis, and Experiment of Multiring Permanent Magnet Bearings by Means of Equally Distributed Sequences Based Monte Carlo Method

Design, Analysis, and Experiment of Multiring Permanent Magnet Bearings by Means of Equally Distributed Sequences Based Monte Carlo Method

Comparison between optimized topologies of permanent magnet thrust bearings with back-iron

Design and optimization of a special magnetic levitated drive with unbalance robustness

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