Winding resistance of litz-wire and multi-strand inductors

Wojda, Rafal P.; Kazimierczuk, Marian K.

doi:10.1049/iet-pel.2010.0359

Cited by 187 publications

(134 citation statements)

References 35 publications

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“…Since it is impossible to measure AC resistance of a winding directly due to the influence introduced by stray-capacitance, a lumped-parameter equivalent circuit model of inductors is used [10], as shown in Fig. 6(a).…”

Section: Resultsmentioning

confidence: 99%

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Analytical Computation of Ac Resistance of Single-Layer Air-Core Helmholtz Coils

Luo¹,

Ke²,

Yan³

et al. 2014

PIER C

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Abstract-An analytical expression of AC resistance of a single-layer air-core Helmholtz coil is presented. Proximity effects between both bundles and strands of litz-wire as well as skin effect are considered. To obtain an accurate analytical expression of proximity effect on bundle level and strand level, a precise distribution of magnetic field is discussed. The analytical expression of AC resistance and quality factor is verified with the experimental results, and the theoretical predictions are in agreement with the measured results.

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Section: Resultsmentioning

confidence: 99%

“…Many approaches to analytical computation of AC resistance of multi-strand and litz-wire windings have been presented [6][7][8][9][10][11]. However, most of the analytical modelsare developed to calculate AC resistance of windings of inductors and transformers.…”

Section: Introductionmentioning

confidence: 99%

Analytical Computation of Ac Resistance of Single-Layer Air-Core Helmholtz Coils

Luo¹,

Ke²,

Yan³

et al. 2014

PIER C

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“…While LFTs operate on low grid frequency, MFTs typically operate with square voltages and non-sinusoidal currents on higher frequencies, characteristic for mentioned power electronic converters. This has an impact on the core [6]- [8] and winding [9]- [19] losses as well as on the insulation coordination, which still requires future research. Moreover, proper design of the MFT electric parameters, magnetization and leakage inductance, is paramount for the correct operation of the converter, especially in case of SRC based topologies where the MFT is a part of a resonant circuit.…”

Section: Kw 10khz Medium Frequency Transformer Design Optimizatiomentioning

confidence: 99%

“…As shown in [20], the modeling correction is performed by a simple substitution of H w with h eq , from (19), within (7), (13) and (15) resulting in accuracy of above 94% over the entire geometry range, as shown in Fig. 4.…”

mentioning

confidence: 99%

100 kW, 10 kHz Medium-Frequency Transformer Design Optimization and Experimental Verification

Mogorovic

Dujić

2019

IEEE Trans. Power Electron.

203

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Abstract-This paper describes a novel, model based, design optimization methodology for high-power medium frequency transformers for medium-voltage high-power electronic applications, namely emerging solid state transformers. Presented procedure enables the designer to interactively select the most optimal design in a simple and intuitive way, while inherently offering flexibility in terms of various design alternatives, depending on the component availability. The core of the design algorithm is explained in detail together with all of the relevant modeling and technical challenges associated with realization of a prototype. A 100 kW, 10 kHz medium frequency transformer prototype has been designed according to the presented algorithm, practically realized and thoroughly tested in order to verify the theoretical design.

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“…For the high power inductors, from aforementioned losses, significant role plays the winding losses [9][10][11][12][13][14][15][16][17][18][19][20][21][31][32][33][34][35][36]. While core and dielectric loss are decreased by selection of low-loss materials, the winding losses are significantly reduced by optimization of the winding conductor size [16,17,19].…”

Section: Introductionmentioning

confidence: 99%

Thermal analytical winding size optimization for different conductor shapes

Wojda¹

2015

Archives of Electrical Engineering

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Abstract. The aim of this paper is to derive an analytical equations for the temperature dependent optimum winding size of inductors conducting high frequency ac sinusoidal currents. Derived analytical equations are useful designing tool for research and development engineers because windings made of foil, square-wire, and solid-round-wire windings are considered. Temperature dependent Dowell's equation for the ac-to-dc winding resistance ratio is given and approximated. Thermally dependent analytical equations for the optimum foil thickness, as well as valley thickness and diameter of the square-wire and solid-round-wire windings are derived from approximated thermally dependent ac-to-dc winding resistance ratios. Minimum winding ac resistance of the foil winding and local minimum of the winding ac resistance of the solid-round-wire winding are verified with Maxwell 3D Finite Element Method simulations.

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Winding resistance of litz-wire and multi-strand inductors

Cited by 187 publications

References 35 publications

Analytical Computation of Ac Resistance of Single-Layer Air-Core Helmholtz Coils

Analytical Computation of Ac Resistance of Single-Layer Air-Core Helmholtz Coils

100 kW, 10 kHz Medium-Frequency Transformer Design Optimization and Experimental Verification

Thermal analytical winding size optimization for different conductor shapes

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