A Linear FEM Benchmark for the Homogenization of the Eddy Currents in Laminated Media in 3D

Hollaus, Karl; Huber, Martin; Schöberl, Joachim; Hamberger, P.

doi:10.3182/20120215-3-at-3016.00211

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…where ω is the angular frequency, ⃗ A the magnetic vector potential, ⃗ J s the source current density, σ the electrical conductivity, and ν the reluctivity [6,7].…”

Section: Homogenization Techniquementioning

confidence: 99%

Finite element simulation of fast corrector magnets for PETRA IV

Christmann,

De Gersem,

von Tresckow

et al. 2024

J. Phys.: Conf. Ser.

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The new synchrotron light source PETRA IV at DESY will use a fast orbit feedback system with hundreds of fast corrector magnets to meet stringent orbit stability requirements. These magnets are operated at high frequencies, creating strong eddy currents that result in Joule losses and a time delay between applied voltage and aperture field. User experiments impose challenging requirements on beam operation to preserve the point of the radiation source. To meet the demanding feedback requirements, finite element simulations are needed to understand the characteristics of the corrector magnet. However, due to the small skin depths at high frequencies and the laminated structure of the yoke, these simulations need a very fine mesh and are thus very costly. Therefore, we homogenize the laminated yoke which reduces the computational effort but captures the eddy current effects accurately. The reduction of simulation times from several hours to a few minutes allows us to conduct extensive studies of the eddy current losses and the field quality of the magnets.

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“…where ω is the angular frequency, ⃗ A the magnetic vector potential, ⃗ J s the source current density, σ the electrical conductivity, and ν the reluctivity [6,7].…”

Section: Homogenization Techniquementioning

confidence: 99%

Finite element simulation of fast corrector magnets for PETRA IV

Christmann,

De Gersem,

von Tresckow

et al. 2024

J. Phys.: Conf. Ser.

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“…Hence, the magnetic flux is multi-directional and, consequently, anisotropic properties must be considered. Several methods of calculating the equivalent properties for laminated cores are reported in literature such as the ones in [17], [18], [19], and [20]. They vary in terms of accuracy, assumptions, and complexity.…”

Section: Simulation Of Laminated Nanocrystalline Ribbon Coresmentioning

confidence: 99%

Feasibility Study of Nanocrystalline-Ribbon Cores for Polarized Inductive Power Transfer Pads

Gaona

Ghosh

2020

IEEE Trans. Power Electron.

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MnZn-based ferrite materials like the EPCOS N87 or K2004 are commonly used as magnetic cores in inductive power transfer (IPT) applications. However, the performance and the reliability of IPT systems are limited by ferrite's intrinsic brittleness and low flux density saturation point. In this paper, a study of nanocrystalline ribbon based magnetic cores for IPT applications is presented. FEM simulations and experimental validations are used to compare both materials. The design of ultra-thin laminated cores such as nanocrystalline ribbons for IPT systems is presented. Compared to ferrite, nanocrystalline ribbon is mechanically more robust; it has a higher magnetic permeability and a higher saturation point. Results show that nanocrystalline ribbon cores achieve more than a 50% volume reduction when used in IPT pads. This is due to nanocrystalline's high saturation point. However, a compromise arises as the total power loss increases due to the induced eddy currents in the core. The reduction of efficiency can be mitigated by special geometrical designs of the nanocrystalline ribbon cores. A 6.6 kW IPT system has been built for experimental validation of the design methodology.

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