Equivalent Conductor Layer for Fast 3-D Finite Element Simulations of Inductive Power Transfer Coils

Delgado, Alberto; Salinas, Guillermo; Oliver, J. A.; Cobos, J.A.; Rodríguez-Moreno, Jorge

doi:10.1109/tpel.2019.2949438

Cited by 19 publications

(18 citation statements)

References 17 publications

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“…The litz strands are assumed perfectly twisted so the current sharing between them is equal. Therefore, a uniform current density is applied [55], [56], [66]. The equivalent conductivity and complex permeability of the homogenized litz are discussed in [56].…”

Section: Rlc Parameters Of the Modelmentioning

confidence: 99%

“…The equivalent conductivity and complex permeability of the homogenized litz are discussed in [56]. Alternative methods to compute the equivalent properties representing ohmic losses due to skin and proximity effect are described in the literature [55], [56], [66]- [69]. The formulation proposed in [56] is chosen for its proven accuracy.…”

Section: Rlc Parameters Of the Modelmentioning

confidence: 99%

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Voltage Distribution in the Windings of Medium-Frequency Transformers Operated With Wide Bandgap Devices

Cremasco

Rothmund

Curti

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

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The short rise time observed in the PWM voltages generated by ultra-fast wide bandgap devices increases the amplitude of voltage harmonics at higher frequencies. These harmonics can excite the resonances of Medium-Frequency Transformers (MFTs), resulting in overvoltages inside the windings during continuous operation. Without further measures, these overvoltages can lead to unexpectedly high electric fields in the insulation material, which can result in partial discharge, accelerated ageing and possible failure of the MFT. To avoid these effects, the mechanism causing the overvoltages has to be understood and quantified during the design process. Based on this, the MFT can be designed in a way that the overvoltages vanish or are tolerable. Therefore, the voltage distribution inside the MFT windings is analysed by a fully-coupled multi-conductor transmission line model, which includes the damping effect of electromagnetic losses in the litz wire and in the core. This method is verified by measuring the transfer functions of the voltage to ground of individual turns and their voltage waveforms during continuous operation. The waveforms indicate repeating overvoltages inside the windings. A guideline for the design verification and a simplified approach to speed-up the modelling process are presented.

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Section: Rlc Parameters Of the Modelmentioning

confidence: 99%

Section: Rlc Parameters Of the Modelmentioning

confidence: 99%

Voltage Distribution in the Windings of Medium-Frequency Transformers Operated With Wide Bandgap Devices

Cremasco

Rothmund

Curti

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

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“…See, e.g. a very recent contribution [13] that combines analytical methods [5] with a three-dimensional (3D) FE model to characterise inductive power transfer coils. Eddy-current effects can be accounted for by a complex impedance in the electrical supply circuit (skin effect) and a complex permeability (or reluctivity) in the homogenised winding window (proximity effect) [8,9].…”

Section: Introductionmentioning

confidence: 99%

Closed‐form complex permeability expression for proximity‐effect homogenisation of litz‐wire windings

Niyomsatian

Gyselinck

Sabariego

2020

IET Science, Measurement & Technology

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The eddy-current losses in litz-wire windings are mostly due to the proximity effect, which can be macroscopically modelled via a complex frequency-dependent permeability. In this study, the authors propose a new closed-form expression for this complex permeability. Results are compared with approximations found in the literature in a wide-frequency range. For the sake of validation, a two-dimensional)-axisymmetric gapped transformer with litz-wire primary and secondary coils is studied.

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“…It is important to highlight that if the thermal homogenization is performed, also an EM homogenization would be required to properly characterize the losses distribution due to high-frequency effects. Some approaches for this purpose can be found in [51]- [55].…”

Section: )mentioning

confidence: 99%

“…As stated in Section 2. [51]- [55]. For the sake of simplicity, the approach from [51] is used in this case.…”

Section: Ac Testsmentioning

confidence: 99%

Thermal modelling of high-frequency magnetic components for power electronics by Finite Element Analysis

Salinas¹

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Volume fraction of conductor material. τ * Introduced variable to replace τ . T cmax Maximum core temperature. T c surf Average core surface temperature. T wmax Maximum winding temperature. T w surf Average winding surface temperature. ∆T Temperature rise. ∆T exp Measured temperature rise. ∆T wireFEA Temperature rise with 'wire level' homogenization. ∆T sim Temperature rise obtained by simulation. ∆T windFEA Temperature rise with 'winding level' homogenization. φ Wire diameter. v cond Volume of conductor material. v ist Volume of strand insulation material. v i imp Volume of impregnation material. v i bund Volume of bundle insulation. v w Volume of a wire. w Width of the cell under study. W a Window area.

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Equivalent Conductor Layer for Fast 3-D Finite Element Simulations of Inductive Power Transfer Coils

Cited by 19 publications

References 17 publications

Voltage Distribution in the Windings of Medium-Frequency Transformers Operated With Wide Bandgap Devices

Voltage Distribution in the Windings of Medium-Frequency Transformers Operated With Wide Bandgap Devices

Closed‐form complex permeability expression for proximity‐effect homogenisation of litz‐wire windings

Thermal modelling of high-frequency magnetic components for power electronics by Finite Element Analysis

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