Determination of the magnetic losses in induction motors based on the generalized Epstein test

Torres, Acd; Filho, Braz J. Cardoso; Lyra, R.O.C.; Cunha, Marcus Antonius Queiroz da; Paolinelli, Sebastião C.

doi:10.1109/ias.2004.1348381

Cited by 10 publications

(9 citation statements)

References 10 publications

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“…Semi processed (SP) steels require further annealing to optimize their magnetic properties [17]. Feedback from the Consortium members were used to choose a list of steels to be tested, which are included in Table 1.…”

Section: Task 2: Instrumentation Developmentmentioning

confidence: 99%

Improved Design of Motors for Increased Efficiency in Residential Commercial Buildings

Pillay¹

2008

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Research progress on understanding magnetic steel core losses is presented in this report. Three major aspects have been thoroughly investigated: 1, experimental characterization of core losses, 2, fundamental physical understanding of core losses and development of core loss formulas, and 3, design of more efficient machine based on the new formulations. Considerable progress has been achieved during the four years of research and the main achievements are summarized in the following:For the experimental characterization, a specially designed advanced commercial test bench was commissioned in addition to the development of a laboratory system with advanced capabilities. The measured properties are core losses at low and higher frequencies, with sinusoidal and non-sinusoidal excitations, at different temperatures, with different measurement apparatus (Toroids, Epstein etc).An engineering-based core loss formula has been developed which considers skin effect. The formula can predict core losses for both sinusoidal and non-sinusoidal flux densities and frequencies up to 4000 Hz. The formula is further tested in electric machines. The formula error range is 1.1% -7.6% while the standard formulas can have % errors between -8.5% -+44.7%.Two general core loss formulas, valid for different frequencies and thickness, have been developed by analytically and numerically solving Maxwell's equations based on a physical investigation of the dynamic hysteresis effects of magnetic materials. To our knowledge, they are the first models that can offer accurate core loss prediction over a wide range of operating frequencies and lamination thicknesses without a massive experimental database of core losses.The engineering core loss formula has been used with commercial software. The formula performs better than the modified Steinmetz and Bertotti's model used in Cedrat/Magsoft Flux 2D/3D. The new formula shows good correlation with measured results under both sinusoidal and non-sinusoidal excitations.

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Section: Task 2: Instrumentation Developmentmentioning

confidence: 99%

Improved Design of Motors for Increased Efficiency in Residential Commercial Buildings

Pillay¹

2008

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“…For example, core loss prediction of non-sinusoidal flux waveforms inside many machines can be calculated with Fourier series, which requires loss data at high frequencies. However, traditional core loss test methods commonly provide data at 50/60 Hz sinusoidal, and on rare occasions, at a few more test points above 1.5 T [1]. The need for core loss data at higher frequencies is driven in part by the increasing use of variable speed drives (VSDs) in industry.…”

Section: Introductionmentioning

confidence: 99%

Magnetic core losses measurement instrumentations and a dynamic hysteresis loss model

Alatawneh

Cheng

Pillay

2009

2009 IEEE Electrical Power &Amp; Energy Conference (EPEC)

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Three typical types of magnetic lamination core loss measurement methods, the toroid tester, the standard Epstein frame and a single sheet tester, are first reviewed. Results of four types of testing (previous three plus a new Epstein frame for high flux density and frequency) are presented and compared. Comparisons among the measurements of different frames show discrepancies in the loss results. A general dynamic hysteresis core loss model is also presented. The model can calculate core losses based on the input parameters obtained from experimental measurements at only one single frequency in a thin lamination. The developed dynamic hysteresis model is simpIe and efficient, and has been shown to be very accurate compared with experiments.

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“…Paper [2] presents a systematic module-based method to refine the common Epstein method estimating the iron losses. In [3] a Generalized Epstein Test is introduced that can be applied in the estimation of the iron losses in induction motors built from different core materials.…”

Section: Introductionmentioning

confidence: 99%

“…The Epstein test is widely used whenever the quantification of the iron losses of magnetic materials is required [2,3,4]. The drawback of the method is that it can lead to significant errors in the estimation of iron core losses in electric machines.…”

Section: Introductionmentioning

confidence: 99%

Development of a dedicated laboratory system for measurement of iron losses in high speed PMSM

Jardan

Varga²,

Stumpf

et al. 2015

2015 IEEE International Conference on Industrial Technology (ICIT)

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Iron loss measurement has always been a concern for the engineers designing electrical machines. A novel test method developed for fast and accurate measurement of iron losses of permanent magnet synchronous machines and a dedicated laboratory system for performing automatic measurements are presented. The principle of the measurement technique, the main building blocks of the laboratory system and the procedures of tests are described. Test results are presented to illustrate the accuracy and repeatability of the measurements that confirm the realization of expectations and the viability of the iron loss measurement system.

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Determination of the magnetic losses in induction motors based on the generalized Epstein test

Cited by 10 publications

References 10 publications

Improved Design of Motors for Increased Efficiency in Residential Commercial Buildings

Improved Design of Motors for Increased Efficiency in Residential Commercial Buildings

Magnetic core losses measurement instrumentations and a dynamic hysteresis loss model

Development of a dedicated laboratory system for measurement of iron losses in high speed PMSM

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