Experimental study of harmonic-flux effects in ferromagnetic materials

Hsu, J.S.; Woodson, H.H.; Liou, S.-S.P.

doi:10.1109/20.24508

Cited by 14 publications

(4 citation statements)

References 2 publications

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“…Desta forma, as perdas também se alteram, em especial as perdas no ferro, as quais dependem não apenas do valor máximo da indução mas também da sua distribuição. Conforme mostrado em (Hsu et al, 1989) as perdas no ferro podem tanto aumentar quanto diminuir, dependendo como as mesmas se dividem entre perdas por histerese e por correntes parasitas. A proporção entre os dois tipos de perdas também varia em função do valor máximo da indução e da frequência (velocidade do rotor).…”

Section: Simulações E Resultados Expe-rimentaisunclassified

Controle de máquinas de indução pentafásicas com otimização do campo no entreferro

Scharlau

Pereira

Haffner

2009

Sba Controle & Automação

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Apresenta-se neste artigo a formulação matemática de um modelo dinâmico para máquinas de indução pentafásicas. O modelo apresentado é baseado em componentes simétricas de valor instantâneo, resultando no desacoplamento das componentes fundamental e de terceiro harmônico da indução no entreferro A partir deste modelo obtém-se dois conjuntos de equações que correspondem a representação em variáveis de estados do efeito de cada um dos componentes harmônicos nas equações da máquina. Resultados de simulação baseados em uma técnica de controle do tipo V/f, a qual utiliza fatores de ponderação para as componentes harmônicas a fim de impor de uma forma de onda de indução trapezoidal no entreferro da máquina, são comprovados experimentalmente validando o modelo proposto.

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Section: Simulações E Resultados Expe-rimentaisunclassified

Controle de máquinas de indução pentafásicas com otimização do campo no entreferro

Scharlau

Pereira

Haffner

2009

Sba Controle & Automação

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“…The transformer behavior and core losses with sinusoidal and nonsinusoidal voltage waveform are investigated both for low-and high-frequency applications in the literature. [8][9][10][11][12][13][14] The harmonic behavior of transformers and nonlinear modeling of magnetizing and core loss currents has garnered interest in recent years. [15][16][17][18][19][20] Behavior of electrical steel sheets in the presence of harmonics is studied in Ghalamestani et al 21 and Zhang et al 22 A number of studies on the transformer design and optimization on transformers were summarized in Amoiralis et al 23 Harmonic analysis on transformer cores by finite element method (FEM) was performed in Corona-Sanchez et al 24 and Jimenez-Mondragon et al 25 Effects of harmonic content on a transformer core is well-known for many years; 26 however, there is not much discussion on the effects of phase shift between the fundamental and the harmonic component of the supply voltage in the literature.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A laboratory application for teaching the effect of harmonics on transformer core saturation

Dönük

2019

International Journal of Electrical Engineering & Education

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Harmonics in supply voltage or load current in a transformer have undesirable effects on the core and windings. As the harmonic content increases, higher core loss and eddy current loss in the windings results in higher operating temperatures. It causes magnetic flux density in the core to increase and shifts the operating point through the saturated region. This phenomenon is mostly taught in undergraduate education as theoretical information. However, as a difficult concept to understand, harmonics phenomenon might be taught by using experiments for active learning, visualizing the effects in a laboratory setting, and making the connection between theoretical and practical applications for deeper and meaningful learning. In this study, a teaching method for effects of harmonics is proposed and phase shift between the fundamental and harmonic component of the supply voltage on the transformer B–H characteristic in a laboratory application is introduced by an experimental work performed on toroidal transformers. Feedback from students shows that the proposed method is very efficient and useful for students to better understand the effects of harmonics on the transformer cores.

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“…The magnitude and the phase shift of the harmonics to the fundamental are of prime importance on the hysteresis loop behavior and finally on the total core losses. Pulsating core loss due to nonsinusoidal flux density waveforms is estimated basically by empirical formulas derived from experimental data [1] and [2]. The influence of harmonic associated to the rotating fields is still to be studied, and no relevant significant work has appeared in the literature.…”

Section: Introductionmentioning

confidence: 99%

The Minor Hysteresis Loop Under Rotating Magnetic Fields in Machine Laminations

Alatawneh

Pillay

2014

IEEE Trans. on Ind. Applicat.

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In rotating ac machines, the saturated flux density waveforms contain harmonics, which create minor hysteresis loops. The minor hysteresis loops in machine laminations constitute an additional loss which requires modifications in traditional core loss formulas. This causes a serious challenge in core loss estimation. The task becomes more competitive under rotating magnetic fields, where the minor loop behavior has not been investigated yet. This paper highlights the problem of harmonics in rotating fields and its effect on the core loss estimation. In addition, the behavior of minor loops under rotating fields is compared with the minor loops under pulsating fields. Measurements were carried out on a nonoriented silicon steel sample of M36G29 with different fundamental frequencies of interest to the industry, 60 Hz and 400 Hz, with consideration of the third harmonic at each frequency. A design of magnetizing test fixture based on an electromagnetic Halbach array is used to perform these measurements. Results are presented and discussed.Index Terms-Electrical steel, Halbach array, Madelung's rules, magnetic minor hysteresis loop, rotational core loss. Natheer Alatawneh (M'13) was born in Amman, Jordan. He received the M.S.

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Experimental study of harmonic-flux effects in ferromagnetic materials

Cited by 14 publications

References 2 publications

Controle de máquinas de indução pentafásicas com otimização do campo no entreferro

Controle de máquinas de indução pentafásicas com otimização do campo no entreferro

A laboratory application for teaching the effect of harmonics on transformer core saturation

The Minor Hysteresis Loop Under Rotating Magnetic Fields in Machine Laminations

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