Theoretical Basis for Physically Correct Measurement and Interpretation of Magnetic Energy Losses

Pfützner, Helmut; Shilyashki, Georgi

doi:10.1109/tmag.2017.2782218

Cited by 10 publications

(14 citation statements)

References 18 publications

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“…However, a condition is that H S is a constant along the whole surface. Later, in 2018, we confirmed this in[18] for the more simple case of a plane lamination of constant thickness d, as it is illustrated by Fig.3.As a basis, we apply the surfaces Poynting vector S PG,S[3,8,10,13,17,18]. In Fig.3, it is assumed directed upwards below the sheet and downwards above it, with identical intensities…”

supporting

confidence: 63%

“…On the other hand, the practically usual, bi-local measurement of H S and B C reveals a widened dynamic loop, the area of which represents the sum of hysteresis loss and eddy current loss. For the practical design of loss testers, we addressed the needed distinctions in several publications like [16][17][18]. Here, we discuss them through a systematic comparison of calculation and measurement of magnetic loss P and instantaneous magnetization power functions p(t).…”

Section: Physical Preconditionsmentioning

confidence: 99%

“…A more effective alternative is the arrangement of a tangential field coil (Hcoil) on the sample surface (e.g. [16][17][18]). As an option, a tangential Hall plate is applied (e.g.…”

Section: Physical Preconditionsmentioning

confidence: 99%

“…As a drawback, the result of measurement is affected by the yoke system, in particular also by the contact regions between sample ends and yoke. A more effective alternative is the arrangement of a tangential field coil (Hcoil) on the sample surface (e.g [16][17][18]…”

mentioning

confidence: 99%

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Calculated versus measured iron losses and instantaneous magnetization power functions of electrical steel

Pfützner

Shilyashki

Huber³

2022

Electr Eng

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Magnetic energy loss P of soft magnetic laminations like SiFe sheets tends to be expressed through an integral over the power product H · dB/dt. Already in earlier papers, we stressed that distinctions are needed for the quantities H and B. However, they are not considered in practically consistent ways, in the so far literature. Here, we discuss these distinctions in closer ways, comparing loss determination by calculation and measurement, respectively. A physically consistent procedure is described for the determination of loss and magnetization power functions through measurement of bi-located quantities HS and BC (S surface, C cross section). On the other hand, it is concluded that corresponding quantitative calculations—based on co-located quantities H and B—are impeded by the high amount of technological parameters of modern steel products. For example, they result from chemical additions, and—in particular—also from specific technologies of rolling, annealing, coating or scribing.

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supporting

confidence: 63%

Section: Physical Preconditionsmentioning

confidence: 99%

“…A more effective alternative is the arrangement of a tangential field coil (Hcoil) on the sample surface (e.g. [16][17][18]). As an option, a tangential Hall plate is applied (e.g.…”

Section: Physical Preconditionsmentioning

confidence: 99%

mentioning

confidence: 99%

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Calculated versus measured iron losses and instantaneous magnetization power functions of electrical steel

Pfützner

Shilyashki

Huber³

2022

Electr Eng

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“…When the flux is distributed uniformly, the core loss of the transformer could be smaller. The authors of [6][7][8][9][10][11][12] literatures indicated that the magnetostriction is the main factor causing core vibration and audible noise. The variation of materials' magnetisation due to the applied magnetic field changes the magnetostrictive strain until reaching its saturation value.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties and vibration characteristics of amorphous alloy strip and its combination

Liu

Noubissi

et al. 2019

IET Electric Power Applications

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Although the cores made with amorphous metal alloy have lowered no-load losses compared with the orientation silicon steel cores, a high cost and noise level are inevitable because the magnetostriction for amorphous metal alloy strip is larger than the ordinary one. This study mainly focused on the experimental systems and methods for magnetic properties measurement, vibration characteristics and noise level of amorphous alloy strip and combinations. The vibration characteristics and noise level of amorphous alloy composite strip were also studied. The influence of the annealing process on magnetic energy, vibration characteristics and noise level of amorphous alloy core were analysed in detail as well. All the testing results and analysis above are helpful for the transformer manufacturers, and they can replace the expensive amorphous alloy metal strip with the combinations to reduce the noise and cost of the cores.

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Practical Aspects of Instantaneous Magnetization Power Functions of Silicon Iron Laminations

Pfützner

Shilyashki

Bengtsson³

et al. 2022

J. Electr. Eng. Technol.

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Magnetic energy loss P of SiFe steel represents a key factor for the efficiency of soft magnetic machine cores. Traditionally, they are operated with 50 Hz (or 60 Hz), a frequency value that yields rather balanced portions of hysteresis loss and eddy current loss. In equivalent circuits of transformers, P tends to be represented by a magnetic power resistance RM, as a constant. For the most important case of sinusoidal induction B of 50 Hz, this would correspond to an instantaneous magnetization power function p(t) that is sinusoidal as well, however, with 100 Hz (or 120 Hz). On the other hand, from complex, non-linear mechanisms of hysteresis, it is obvious that p(t) should be strongly non-sinusoidal, even for exactly sinusoidal B(t). So far, almost all corresponding instantaneous investigations were restricted to calculated modelling of loss portions and transient modelling. On the other hand, for the first time, the present study was focussed on functions p(t) as measured at IEC-standardized samples of industrially relevant steel. Practical evaluations are discussed with respect to the revealed “history” of magnetization processes, as well as for product characterization. For these tasks, a novel digitized “Low-mass Single Sheet Tester” was developed that was applied for both non-oriented steel (NO) and grain-oriented steel (GO), for 50 Hz. Interpretations proved to be favoured by relating p(t) to total P, according to an instantaneous power ratio. As a result, both steel types revealed strongly non-sinusoidal power functions, with short durations of negative p. Negative p proved to be most pronounced for NO steel, as a measure for the onset of reversible turns of atomic moments. As a consequence, p(t) comprises strong upper harmonics of 200 Hz and even 300 Hz. Based on theoretical considerations, we split p(t) in a dissipative loss power function pL(t) and in a potential energy power function pP(t). Finally, we used p(t) to determine the corresponding power resistance RM(t) that proves to be a distinctly nonlinear function as well. It resembles a rectified co-sinus, also exhibiting short negative spikes that reflect the crystallographic dis-orientation of the polycrystalline material.

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Theoretical Basis for Physically Correct Measurement and Interpretation of Magnetic Energy Losses

Cited by 10 publications

References 18 publications

Calculated versus measured iron losses and instantaneous magnetization power functions of electrical steel

Calculated versus measured iron losses and instantaneous magnetization power functions of electrical steel

Magnetic properties and vibration characteristics of amorphous alloy strip and its combination

Practical Aspects of Instantaneous Magnetization Power Functions of Silicon Iron Laminations

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