Analytical Prediction of Open-Circuit Eddy-Current Loss in Series Double Excitation Synchronous Machines

Bellara, A.; Bali, Habiba; Belfkira, R.; Amara, Yacine; Barakat, Georges

doi:10.1109/tmag.2011.2138710

Cited by 23 publications

(9 citation statements)

References 15 publications

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“…Although (7) contains complex components, the magnetic vector potential as such is real. This implies that the Fourier coefficients linked to harmonic combinations (n, k) and (−n, −k) have to be complex conjugate.…”

Section: Real Functionsmentioning

confidence: 99%

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Computational-Time Reduction of Fourier-Based Analytical Models

Hannon

Sergeant

Dupré

2018

IEEE Trans. Energy Convers.

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An increasing interest in both efficient electric machines and more extensive control strategies demands evermore faster simulation tools. In that context, Fourier-based models, which combine low computational times with a high accuracy, have already proven their value. However, even Fourier-based models may encounter problems related to CPU usage. To cope with these problems the authors present a number of simple techniques to reduce the computational effort of Fourier-based models for synchronous machines. The techniques are based on simplifying the studied geometry and a qualitative analysis of the machine's time-and spatial-harmonic content. The proposed techniques are validated and a benchmark test has shown that a great reduction in computational burden can be achieved without significant loss of accuracy. The preliminary harmonic analysis gives, by far, the largest reduction of the computational burden.

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Section: Real Functionsmentioning

confidence: 99%

“…Although some authors of FB models have reported on numerical issues [3], [7], [8], to date no extensive study of the computational time of such models has been presented. The only available literature that discusses computationaltime reduction was presented by Ramakrishnan et al in [9].…”

Section: Introductionmentioning

confidence: 99%

Computational-Time Reduction of Fourier-Based Analytical Models

Hannon

Sergeant

Dupré

2018

IEEE Trans. Energy Convers.

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“…In addition to the value of the ac loss, the distribution of the overall copper losses in the stator winding is of interest particularly if coupled thermal-EM design optimization is desired [2], [3]. In a broad categorization, the popular methods for analysis of eddy current losses in PM machines rely on analytical models as in [4]- [5][6] [7][8] [9][10] [11] [12], numerical finite element (FE)/difference analysis as in [13]- [14][15] [16], or rely on combined analytical-FE-experimental procedures as in [17]- [18] [19]. The analytical models lack the desired accuracy under magnetic core saturation and are not applicable to complex geometry without further compromising the accuracy.…”

Section: Section I Introductionmentioning

confidence: 99%

Computationally Efficient Strand Eddy Current Loss Calculation in Electric Machines

Fatemi

Ionel

Demerdash

et al. 2019

IEEE Trans. on Ind. Applicat.

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A fast finite element (FE) based method for the calculation of eddy current losses in the stator windings of randomly wound electric machines is presented in this paper. The method is particularly suitable for implementation in large-scale design optimization algorithms where a qualitative characterization of such losses at higher speeds is most beneficial for identification of the design solutions that exhibit the lowest overall losses including the ac losses in the stator windings. Unlike the common practice of assuming a constant slot fill factor s f for all the design variations, the maximum s f in the developed method is determined based on the individual slot structure/dimensions and strand wire specifications. Furthermore, in lieu of detailed modeling of the conductor strands in the initial FE model, which significantly adds to the complexity of the problem, an alternative rectangular coil modeling subject to a subsequent flux mapping technique for determination of the impinging flux on each individual strand is pursued. Rather than pursuing the precise estimation of ac conductor losses, the research focus of this paper is placed on the development of a computationally efficient technique for the derivation of strand eddy current losses applicable in design optimization, especially where both the electromagnetic and thermal machine behavior are accounted for. A fractional-slot concentrated winding permanent magnet synchronous machine is used for the purpose of this study due to the higher slot leakage flux and slot opening fringing flux of such machines, which are the major contributors to strand eddy current losses in the windings. The analysis is supplemented with an investigation on the influence of the electrical loading on ac winding loss effects for this machine design, a subject that has received less attention in the literature. Experimental ac loss measurements on a 12-slot 10-pole stator assembly will be discussed to verify the existing trends in the simulation results.

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“…into consideration, under the assumption that the eddy current field is of the resistance type. Two-dimensional models were developed with polar coordinates [10][11][12][13] or Cartesian coordinates [14], and the permeability of the stator and rotor cores is supposed to be infinite [15,16]. In [17], the time harmonics are discussed, and an extended model was developed.…”

Section: Introductionmentioning

confidence: 99%

A Novel Rotor Eddy Current Loss Estimation Method for Permanent Magnet Synchronous Machines with Small Inductance and a Conductive Rotor Sleeve

Pei

Guo

et al. 2019

Energies

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Typically, permanent magnet synchronous machines (PMSMs) with small inductance can achieve a higher power density and higher power factor. Thus, in many industrial applications, more and more PMSMs are being designed with small inductance. Compared with traditional PMSMs, current harmonics in small inductance PMSMs are much more abundant, and the amplitudes are usually high. These current harmonics will cause large eddy current losses (ECLs) on the rotor, making the estimation of ECLs necessary in the design stage. Currently, ECL estimation methods are usually based on frequency order information, which cannot tell the travelling direction of the harmonic magneto-wave, resulting in the inaccuracy of the estimation. This article proposes a novel estimation method based on the mechanism of the formation of space-vector pulse width modulation (PWM), which considers both the frequency order and travelling direction of the harmonic wave, resulting in the improvement of the accuracy. Besides this, by using double Fourier analysis (DFA) instead of traditional fast Fourier analysis (FFA), the predicted frequencies of the current harmonics are more accurate and free of the troubles caused by traditional FFA-based methods. Simulation study and experiments are conducted to show the effectiveness of the proposed method.

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Analytical Prediction of Open-Circuit Eddy-Current Loss in Series Double Excitation Synchronous Machines

Cited by 23 publications

References 15 publications

Computational-Time Reduction of Fourier-Based Analytical Models

Computational-Time Reduction of Fourier-Based Analytical Models

Computationally Efficient Strand Eddy Current Loss Calculation in Electric Machines

A Novel Rotor Eddy Current Loss Estimation Method for Permanent Magnet Synchronous Machines with Small Inductance and a Conductive Rotor Sleeve

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