Analytical Calculation of Copper Losses in Litz-Wire Windings of Gapped Inductors

Stadler, Alexander; Huber, Raoul; Stolzke, Tobias; Gulden, Christof

doi:10.1109/tmag.2013.2282333

Cited by 16 publications

(8 citation statements)

References 7 publications

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“…Another interesting (and worth mentioning) method of calculating the winding loss is the complex permeability approach. Since it is a rather different approach to the methods discussed here, and for this reason is out of the scope of the paper, we refer the readers to [15,[33][34][35][36][37][38] for more information.…”

Section: Conduction Loss Calculations In the Presence Of A Given Magn...mentioning

confidence: 99%

Analytical Winding Power Loss Calculation in Gapped Magnetic Components

et al. 2021

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The analytical calculation of winding loss in gapped magnetic components is complex, and numerical analysis tools, such as finite elements analysis (FEA) tools, are commonly needed to characterize the windings. As FEA tools are used, the required design time of these types of components increases greatly when many simulations are needed to select the appropriate component for a given application, and simple analytical models become necessary to reduce the design time. In this paper, some analytical approaches for winding loss calculation in gapped magnetic components are reviewed and a general two-dimensional equivalent method, which aims to consider the frequency effects in conductors in a simplified manner, is proposed afterward. Due to its simplicity, it can be integrated into design and optimization tools in order to evaluate the influence of the air gap over the winding loss even at the early stages of the design process. The presented model shows good agreement with FEA simulations and measurements.

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Section: Conduction Loss Calculations In the Presence Of A Given Magn...mentioning

confidence: 99%

Analytical Winding Power Loss Calculation in Gapped Magnetic Components

et al. 2021

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“…© 2021 The Authors. IET Power Electronics published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology [8,9]. However, engineers face difficulties in accurately defining winding resistance for complex winding structures as a function of frequency during the optimization stage of magnetic components [10].…”

Section: Introductionmentioning

confidence: 99%

“…The twisting imperfections and inappropriate twisting pitch (length of lay in longitudinal direction of wire bundle) can produce a drastic rise in winding resistance and losses [7]. Hence, a comprehensive understanding of the frequency dependent phenomenon in litz wire is a key to the optimal design of magnetic components [8, 9]. However, engineers face difficulties in accurately defining winding resistance for complex winding structures as a function of frequency during the optimization stage of magnetic components [10].…”

Section: Introductionmentioning

confidence: 99%

Efficient finite element modelling of litz wires in toroidal inductors

Panchal

Lehikoinen

Rasilo

2021

IET Power Electronics

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Accurate understanding of losses and frequency‐dependent winding parameters have been an important aspect for selecting the right configuration of stranded conductors in power‐electronic inductors. An approach for modelling frequency‐dependent parameters of a winding with twisted wire bundles in toroidal inductors using a multi‐axial sliced finite element (FE) modelling approach is presented here. A 2D magnetodynamic FE problem is solved in several axial and radial slices of the inductor, accounting for the twisted conductor bundles by varying the conductor positions in the slices. Case studies are presented for different levels and pitch lengths of twisting. The approach is validated against 3D FE simulations in the case of 3–4 parallel strands and against measurements in the case of 75, 105 and 125 strands, which would be impossibly heavy for conventional 3D FE tools. The results provide insight into the effect of strand grouping, twisting levels and twisting pitch on the frequency‐dependent resistance of windings.

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“…However, it is worth mentioning that no similar study on the influence of the ITSC fault on the HSPMG rotor loss has been found in many literatures. Some scholars have analyzed and studied the copper losses of the form-wound windings, the litz-wire windings and the layered windings, but few scholars have studied and analysed the copper loss of the Gramme ring windings under the fault [10][11][12]. In addition, the stator was segmented by Hieu et al, and the effect of stator segmenting on the performance parameters of switched reluctance motors, especially the torque, was studied [13].…”

Section: Introductionmentioning

confidence: 99%

Influence of inter‐turn short‐circuit fault on the loss of high speed permanent magnet generator with Gramme ring windings

Qiu

Zhao

Wei

et al. 2019

IET Power Electronics

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The primary problem brought by high speed is high-frequency loss. The loop current (LC) of inter-turn short-circuit fault causes serious distortion of the magnetic field in high speed permanent magnet generator (HSPMG), whose effects on the loss cannot be ignored. In order to reveal the influence mechanism of ITSC fault on the loss, the two-dimensional finite element model of the 117 kW, 60,000 rpm HSPMG is established. By comparing calculation results and test data, the accuracy of the model is verified. The distribution of the eddy current density is studied, and the fundamental reason for the sharp increase of eddy-current loss after fault is found. The core losses at different positions were obtained by segmenting stator core, and the variation mechanisms of core losses at different positions are revealed. The change of heat source distribution of stator core after fault is determined. The variation of winding copper loss after fault is analysed, and the influence degree of the LC on the fault phase and healthy phase copper loss is determined. In addition, because the temperature field is directly related to the loss, the research also laid a foundation for the next analysis of the temperature field.

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Analytical Calculation of Copper Losses in Litz-Wire Windings of Gapped Inductors

Cited by 16 publications

References 7 publications

Analytical Winding Power Loss Calculation in Gapped Magnetic Components

Analytical Winding Power Loss Calculation in Gapped Magnetic Components

Efficient finite element modelling of litz wires in toroidal inductors

Influence of inter‐turn short‐circuit fault on the loss of high speed permanent magnet generator with Gramme ring windings

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