Contribution of End-Winding Proximity Losses to Temperature Variation in Electromagnetic Devices

Wróbel, Rafał; Młot, A.; Mellor, P.H.

doi:10.1109/tie.2011.2148686

Cited by 102 publications

(65 citation statements)

References 27 publications

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“…Therefore, if the ratio of / is to be used as a figure of merit for comparison of ac losses between different design solutions, it should be derived and formulated under various loading conditions. 23 Here, for experimental demonstration of variation of / with respect to frequency, and under one particular loading condition, the loss derivation method introduced in 19 is used.…”

Section: Case-study Analysis and Experimental Verification On 12-slotmentioning

confidence: 99%

A computationally efficient method for calculation of strand eddy current losses in electric machines

Fatemi

Ionel

Demerdash

et al. 2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract:In this paper, a fast finite element (FE)-based method for the calculation of eddy current losses in the stator windings of randomly wound electric machines with a focus on fractional slot concentrated winding NOT THE PUBLISHED VERSION; this is the author's final, peer-reviewed manuscript. The published version may be accessed by following the link in the citation at the bottom of the page.

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Section: Case-study Analysis and Experimental Verification On 12-slotmentioning

confidence: 99%

A computationally efficient method for calculation of strand eddy current losses in electric machines

Fatemi

Ionel

Demerdash

et al. 2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…For the copper winding, α = 0.00393 (K ) and ρ(T 0 ) = 1.724 × 10 !9 (Ω/m) [7,8,16]. Substituting (4) into (3) one obtains the temperature dependent skin depth of the winding conductor Similarly, second term of Dowell's equation can be expanded into Maclaurin's series yielding approximated expression…”

Section: Dowell's Winding Resistance and Its Approximationmentioning

confidence: 99%

“…Common failure mechanisms in inductors are mainly owing to excessive temperature rise [7,8]. The excessive temperature causes cracks in the ferrite core and hence decreases the inductance of the inductor or the transformer.…”

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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“…T is of importance to numerically evaluate the eddy current losses in multi-turn coils used in electric machines and devices such as motors [1,2] and inductors [3] because of increase in the driving frequency. Moreover, development of contactless energy transfer systems [4,5] and eddy-current sensors [6] requires to accurately compute frequency dependence of the impedance in multi-turn coils.…”

Section: Introductionmentioning

confidence: 99%

Semi-Analytical Approach for Finite-Element Analysis of Multi-Turn Coil Considering Skin and Proximity Effects

Igarashi

2017

IEEE Trans. Magn.

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Native application of finite element method (FEM) to analysis of skin and proximity effects in multi-turn coils results in large equation systems whose solution needs long computational time. This paper proposes a semi-analytical approach to overcome this problem. For analysis of the proximity effect, the complex permeability of a round conducting wire immersed in uniform time-harmonic magnetic fields is represented in a closed form. Then, the homogenized complex permeability over the cross section of the multi-turn coil is analytically evaluated using the Ollendorff formula. The magnetoquasistatic problem is thus replaced by the magnetostatic one in which the multi-turn coil is treated as a uniform material with the homogenized complex permeability. The skin effect is taken into consideration by introducing the corresponding impedance in the circuit equation. The proposed method is shown to give the impedance of multi-turn coils which is in good agreement with that obtained by conventional FEM as well as experiments.Index Terms-Skin effect, proximity effect, eddy current, homogenization, complex permeability, multi-turn coil.

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Contribution of End-Winding Proximity Losses to Temperature Variation in Electromagnetic Devices

Cited by 102 publications

References 27 publications

A computationally efficient method for calculation of strand eddy current losses in electric machines

A computationally efficient method for calculation of strand eddy current losses in electric machines

Thermal analytical winding size optimization for different conductor shapes

Semi-Analytical Approach for Finite-Element Analysis of Multi-Turn Coil Considering Skin and Proximity Effects

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