Estimation of core losses under sinusoidal or nonsinusoidal induction by analysis of magnetization rate

Lancarotte, Marcelo Shiroma; Penteado, Aderbal de Arruda

doi:10.1109/iemdc.1999.769155

Cited by 11 publications

(11 citation statements)

References 7 publications

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“…It was interesting to notice the anvil-like ("heel") distortions of the modelled loop shape. This effect has already been noticed and discussed in (Lancarotte and de A. Penteado, 2001;Zirka et al, 2008). We believe that an (7).…”

Section: Resultsmentioning

confidence: 73%

Hysteresis curves of a resistance spot welding transformer

Petrun

Chwastek

Dolinar

2013

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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PurposeThe aim of the paper is to provide a simple and reliable hysteresis model for prediction of magnetization curves of a resistance spot welding transformer (RSWT) core, operating in a wide range of flux densities and excitation frequencies.Design/methodology/approachThe hysteresis model considered in the paper is the T(x) description advanced by J. Takács. Three options to extend the model to the dynamic magnetization conditions are considered. The excitation conditions differ from those prescribed by international standards.FindingsThe quasi‐static Takács model combined with a fractional viscosity equation similar to that proposed by S.E. Zirka outperforms other considered options. The effect of eddy currents may be considered as a disturbance factor to the frequency‐independent quasi‐static hysteresis loop.Research limitations/implicationsThe combined approach yields in most cases a satisfactory agreement between theory and experiment. For highest frequency considered in the paper (1 kHz) excessive “heels” were observed in the modelled loops. This artifact may be reduced by the introduction of a more complicated relationship for the viscous term. Future work shall be devoted to this issue.Practical implicationsThe combined Takács‐Zirka model is a useful tool for prediction of magnetization curves of a RSWT core in a wide range of flux densities and excitation frequencies.Originality/valueThe usefulness of the Takács description has been verified in a practical application. The model is able to predict magnetization curves under non‐standard excitation conditions.

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Section: Resultsmentioning

confidence: 73%

Hysteresis curves of a resistance spot welding transformer

Petrun

Chwastek

Dolinar

2013

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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“…The major loss increase is heavily pronounced through the eddy current loss term. From (1), it is seen that for nonsinusoidal supplies, the eddy current loss component depend more on the rate of change of flux (slope, dB/dt), as observed by [6]. The current ripple has been found to increase with decreasing modulation index.…”

Section: B Modulation Indexmentioning

confidence: 71%

Lamination Core Losses in Motors With Nonsinusoidal Excitation With Particular Reference to PWM and SRM Excitation Waveforms

Mthombeni

Pillay

2005

IEEE Trans. On Energy Conversion

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The effects of varying the modulation index and the switching frequency on steel lamination core losses when excited with pulse width modulated waveforms are first investigated. A switched reluctance motor flux model is also developed and flux waveforms for different parts of the machine are synthesized. Using these flux waveforms, the paper presents the loss trend inside a switched reluctance machine, showing the core loss variation of the machine. The rotor was found to incur higher losses than any other part inside the switched reluctance motor. The paper further identifies the flux density harmonics that contribute to higher core losses in the rotor. Using the Fourier series, an attempt to predict core losses under switched reluctance motor flux density waveforms is done and the predicted results are compared with measurements. An Epstein frame was used for direct core loss measurements on 0.0140 in. [0.36 mm] commercial electrical steel; the methods and test bench used, along with test results are detailed in the paper.

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“…Some of the shortcomings of this method are that flux density is not uniformly distributed due to leakage flux around the joints [5]. The corners have been found to cause errors [5].…”

Section: Epstein Framementioning

confidence: 99%

“…The corners have been found to cause errors [5]. The magnetic length (94-cm) is estimated, not an accurate value.…”

Section: Epstein Framementioning

confidence: 99%

Core losses in motor laminations exposed to high frequency or nonsinusoidal excitation

Mthombeni

Pillay

38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003.

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This paper first reviews three internationally standardized core loss measurement methods: Epstein frame, Toroids and Single Sheet testers. A comparison of the Epstein frame and toroid test results is presented for annealed and unannealed steel. Two methods are used to predict core losses under non-sinusoidal supplies. The first method uses the Fourier series and an improved loss separation algorithm to predict core losses under equivalent brushless dc motor flux waveform with known spectrum. For lower harmonics, superposition yielded results close to the measured values. The second method uses the form factor concept and an improved loss separation algorithm to predict core loss. The combination of the improved loss separation algorithm and the form factor concept was found to yield results close to the measured losses under high frequency supplies, such as pulse width modulated waveforms. An Epstein frame with commercial 0.0140-inch electrical steel was used for direct core loss measurements; the methods and test bench used are detailed in the paper, along with test results.

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Estimation of core losses under sinusoidal or nonsinusoidal induction by analysis of magnetization rate

Cited by 11 publications

References 7 publications

Hysteresis curves of a resistance spot welding transformer

Hysteresis curves of a resistance spot welding transformer

Lamination Core Losses in Motors With Nonsinusoidal Excitation With Particular Reference to PWM and SRM Excitation Waveforms

Core losses in motor laminations exposed to high frequency or nonsinusoidal excitation

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