A reference system for the measurement of low-strength magnetic flux density

Fiorillo, F.; Durin, Gianfranco; Rocchino, L.

doi:10.1016/j.jmmm.2006.02.149

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…The fieldmetric method, where the effective tangential field at the sample surface in the sensing area, is measured by means of a 700-turn flat (1 mm thick) H-coil with two crossed windings was applied up to 1.7 T. The homogeneity of the measured field in the sensing area is not known, but it can be induced from the knowledge of the homogeneity of B and the material permeability. The H-coil was calibrated through a reference magnetic field source [8]. Low-noise SRS 560 amplifiers and a TDS 420A digital oscilloscope were used for signal acquisition.…”

Section: Resultsmentioning

confidence: 99%

An intercomparison of rotational loss measurements in non-oriented Fe–Si alloys

Ragusa

Żurek

Appino

et al. 2008

Journal of Magnetism and Magnetic Materials

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Section: Resultsmentioning

confidence: 99%

An intercomparison of rotational loss measurements in non-oriented Fe–Si alloys

Ragusa

Żurek

Appino

et al. 2008

Journal of Magnetism and Magnetic Materials

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“…1. The H-coil (turn-area NHSH = 2.11×10 -2 m 2 , thickness ~ 1.5 mm) is made of a few hundred turns (wire diameter 0.05 mm) wound on a rigid fibreglass plate and calibrated inside a field reference setup [10]. The 50-turn B-coil enwraps the H-coil and the strips under test.…”

Section: Experimental Methodsmentioning

confidence: 99%

Effective versus standard Epstein loss figure in Fe-Si sheets

Ferrara

Appino

Rocchino

et al. 2017

International Journal of Applied Electromagnetics and Mechanics

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The magnetic power losses have been measured at 50 Hz and different peak polarization values on different types of non-oriented and grain-oriented Fe-Si sheets using the Epstein frame, according to the current standards.The very same measurements have then been repeated by measuring polarization and tangential magnetic field by means of localized windings, centrally placed on the strips inside the Epstein frame windings, thereby retrieving the effective field and the true power loss figure. It is obtained that the ratio of the standard Pepst to the effective Peff loss figure, which can be interpreted in terms of ratio of effective leff to conventional (lm = 0.94 m) magnetic path length, evolves with the peak polarization Jp, showing, in general, a monotonic increase with increasing Jp.The deviation of Pepst from Peff is observed to range from about -3 % in the non-oriented alloys at low inductions to about +5 % in the grain-oriented alloys at Jp = 1.8 T. This behavior finds a rationale in the existence of a polarization profile Jp(x) measured along the strip length and in the dependence of Peff on Jp, showing a power law Peff(Jp) µ Jp n , with n >1 and increasing with Jp. The so calculated effective path length leff = lm×Pepst / Peff consistently show a monotonic increase with Jp, which is more relevant in the GO alloys.

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“…60 mm) to avoid effects from workhardened edges, have been proposed [39] [40]. H-coil measurements are not easy, because a rigid multiturn thin sensor must be realized and accurately calibrated [41] [42] and the induced signal at power frequencies can be very small and noisy, besides requiring integration. This makes this method appropriate for precise measurements in the laboratory, but unsuitable for the industrial practice.…”

Section: ) Epstein Framementioning

confidence: 99%

1-D and 2-D Loss-Measuring Methods: Optimized Setup Design, Advanced Testing, and Results

Barrière

Appino²,

Ragusa

et al. 2018

IEEE Trans. Magn.

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Accurate measurements of magnetic losses in laminations are a prerequisite for their theoretical assessment, as well as for satisfying calculations of energy dissipation in engineering systems. The standardized and universally applied measurement method, used as a reference for the definition of the material quality in the specification standards, is based on the Epstein test frame magnetizer. Its success relies on the reproducibility of the performed measurements. Its limitations come, on the one hand, from cumbersome sample preparation and, on the other hand, from a certain divergence of the measured loss figures from the true loss figures. Similar systematic differences between measured and true loss values are also observed with the standard Single Sheet Tester method. In both cases, measurements under bi-dimensional induction are or cannot be envisaged. The design of new measurement setups and magnetizers overcoming the drawbacks of the Epstein and Single Sheet Tester methods and possibly becoming recognized Standards in the future is welcome, but challenging. This paper is devoted to a comprehensive discussion of the state of the art in the alternating and two-dimensional measurements of energy losses in soft magnetic materials for electrical applications. We will summarize, in particular, measuring solutions proposed in the current literature and we will discuss in detail recent developments achieved in the authors' labs regarding 1D measurements with compensated permeameters and 2D measurements at high inductions and high frequencies.

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A reference system for the measurement of low-strength magnetic flux density

Cited by 5 publications

References 4 publications

An intercomparison of rotational loss measurements in non-oriented Fe–Si alloys

An intercomparison of rotational loss measurements in non-oriented Fe–Si alloys

Effective versus standard Epstein loss figure in Fe-Si sheets

1-D and 2-D Loss-Measuring Methods: Optimized Setup Design, Advanced Testing, and Results

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