An Improved Loss-Separation Method for Transformer Core Loss Calculation and Its Experimental Verification

Li, Huiqi; Wang, Lin; Li, Jun; Zhang, Junjie

doi:10.1109/access.2020.3037112

Cited by 9 publications

(4 citation statements)

References 31 publications

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“…The core loss model is based on the Bertotti's separation of losses technique [100], which is expressed by Equation (13).…”

Section: Core Loss In C-core Magnetic Circuitmentioning

confidence: 99%

Overview on Permanent Magnet Motor Trends and Developments

Vlachou,

Sakkas,

Xintaropoulos

et al. 2024

Energies

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The extreme environmental issues and the resulting need to save energy have turned attention to the electrification of energy applications. One of the key components involved in energy efficiency improvements is the appropriate conception and manufacturing of electric machines. This paper overviews the electromagnetic analysis governing the behavior of permanent magnets that enable substantial efficiency gains in recent electric machine developments. Particular emphasis is given to modeling the properties and losses developed in permanent magnets in emerging high speed applications. In addition, the investigation of properties and harmonic losses related to ferromagnetic materials constituting the machine magnetic circuits are equally analyzed and discussed. The experimental validation of the implemented methodologies and developed models with respect to the obtained precision is reported. The introduction of mixed numerical techniques based on the finite element method intended to appropriately represent the different physical phenomena encountered is outlined and discussed. Finally, fast and accurate simulation techniques including aggregated lumped parameter models considering harmonic losses associated with inverter supplies are discussed.

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“…The core loss model is based on the Bertotti's separation of losses technique [100], which is expressed by Equation (13).…”

Section: Core Loss In C-core Magnetic Circuitmentioning

confidence: 99%

Overview on Permanent Magnet Motor Trends and Developments

Vlachou,

Sakkas,

Xintaropoulos

et al. 2024

Energies

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“…In each of the studies mentioned above, it was necessary to model the magnetic circuit of the device under analysis. However, this process can be challenging if there is a lack of data, for instance, when the electric steel characteristics are unknown and there is no access to sophisticated equipment for material characterization tests [20], [21]. In addition, occasionally, it is necessary to model devices in operation, where the characteristics of its electric steel sheets may vary due to thermal stress, steel sheets aging [22] or even because of mechanical stress during its assembly or transport.…”

Section: Introductionmentioning

confidence: 99%

A Non-Invasive Methodology for Magnetic Characterization of Transformers and Reactors

Américo

Leite

Mazzola

2023

J. Microw. Optoelectron. Electromagn. Appl.

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The lack of data is a hindrance to the experimental determination of magnetic cores characteristics. This work presents a non-invasive and field-applicable methodology for electromagnetic devices characterization. Based on fundamental equations of electromagnetism and routine tests, the methodology was applied to obtain, at low frequency: the core loss separation, the hysteresis loop and its BH curve of a three-phase dry core-type transformer. The required equipment and the procedures to do the characterization are presented and discussed. The results were compared with experimental data obtained from tests that were carried out on the same material using a Single Sheet Tester device. The results show a difference in losses of 4.9% for hysteresis, 1.5% for dynamic, and 3.3% for total losses. In the no-load test comparison there was a difference of 4% for dynamics and 1.8% in total losses. The proposed methodology can be applied to different magnetic core types as well as to single-phase transformers and reactors.

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“…Its origin is often explained with Bertotti's theory, also known as loss separation, where the excess loss is related with the domain structure of magnetic material [2,[4][5][6][7][8][9]]. Bertotti's approach is still a field of extensive research, including its validation for new types of soft magnetic materials as well as for non-sinusoidal excitations [10][11][12][13]. However, it should be remembered that the classical formulas do not take into consideration the dynamics of domain structure (movement of domain walls, creation and annihilation of domains), i.e., they neglect the microscopic eddy currents caused by magnetic flux changes near domain walls.…”

Section: Introductionmentioning

confidence: 99%

An Improved Approach to Calculate Eddy Current Loss in Soft Magnetic Materials Based on Measured Hysteresis Loops

Jabłoński

Najgebauer

Bereźnicki³

2022

Energies

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The paper presents a study of the influence of magnetic hysteresis on macroscopic eddy current losses. Usually, this loss is calculated within many simplifying assumptions, of which the most striking is not only neglecting the hysteresis, but also the nonlinearity of the material. To check how such simplifications affect the results, the loss was calculated taking into account the hysteresis phenomenon for several materials. For this purpose, an algorithm for solving Maxwell’s equations with magnetic characteristics given as a family of measured hysteresis loops was constructed. A new method for conversion between H and B fields using the measured hysteresis loops was also proposed. The results of calculations for three materials show that the eddy current loss calculated with magnetic hysteresis taken into account are smaller than those calculated via the classical formula obtained for linear materials. For the tested materials, the differences reach up to around 30%, depending on frequency, magnetic flux density and thickness of electrical sheet. This may result, among others, in erroneous determination of the excess loss in Bertotti’s approach.

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An Improved Loss-Separation Method for Transformer Core Loss Calculation and Its Experimental Verification

Cited by 9 publications

References 31 publications

Overview on Permanent Magnet Motor Trends and Developments

Overview on Permanent Magnet Motor Trends and Developments

A Non-Invasive Methodology for Magnetic Characterization of Transformers and Reactors

An Improved Approach to Calculate Eddy Current Loss in Soft Magnetic Materials Based on Measured Hysteresis Loops

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