Rotational Core Loss Magnetizer: Design and Measurements

Akiror, Jemimah C.; Wanjiku, John; Pillay, Pragasen; Cave, J.R.; Merkhouf, Arezki

doi:10.1109/tia.2018.2844844

Cited by 12 publications

(3 citation statements)

References 24 publications

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“…Firstly, the magnetic field in a rotating electrical machine and the T-joint of a three-phase transformer are essentially rotational [ 85 , 86 , 87 , 88 ]. The magnetic flux density (B) and magnetic field strength (H) vectors are not aligned in the same direction, resulting in two-dimensional (2-D) vectorial magnetization.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Developing High-Power-Density Electromagnetic Devices with Nanocrystalline and Amorphous Magnetic Materials

et al. 2023

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With the increasing demand for smaller, lighter, and more affordable electromagnetic devices, there is a growing trend toward developing high-power-density transformers and electrical machines. While increasing the operating frequency is a straightforward approach to achieving high power density, it can lead to significant power loss within a limited volume, resulting in excessive temperature rise and device degradation. Therefore, it is crucial to design high-power-density electromagnetic devices that exhibit low power loss and efficient thermal dissipation to address these challenges. Advanced techniques, such as the utilization of novel and advanced electromagnetic materials, hold great promise for overcoming these issues. Specifically, nanocrystalline and amorphous magnetic materials have emerged as highly effective solutions for reducing power loss and increasing efficiency in electromagnetic devices. This paper aims to provide an overview of the application of nanocrystalline and amorphous magnetic materials in transformers and electrical machines, along with key technologies and the major challenges involved.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Developing High-Power-Density Electromagnetic Devices with Nanocrystalline and Amorphous Magnetic Materials

et al. 2023

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“…Another approach allowing to overcome this drawback consists in considering a topology similar to a conventional three-phase induction machine, the rotor being simply replaced by a round-shape test sample (Wanjiku and Pillay, 2015, 2016; Akiror et al , 2018). A variant of this topology consists in magnetizing the same kind of round-shape test sample by a system of electromagnets working as a Halbach array of magnets (Wanjiku and Pillay, 2015, 2016; Yue et al , 2019b).…”

Section: Introductionmentioning

confidence: 99%

Influence of the geometric parameters of a vertical rotational single-sheet tester on sample field homogeneity

Tolentino

Parent

Ninet

et al. 2023

COMPEL

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Purpose The horizontal rotational single-sheet tester (RSST) suffers from weaknesses such as the reduced size of test samples, measurement disturbances due to magnetic flux leakage and nonhomogeneity of field in the measurement area. Although the vertical RSST allows to overcome the first two aforementioned drawbacks, the heterogeneity of the field in the test sample remains an issue. In addition, there is still a lack of device standardization to ensure test repeatability, as already is well established with the Epstein frame. This paper aims to investigate the influence of several parameters on the field homogeneity in the test sample. Design/methodology/approach A fully 3D finite element model of a vertical RSST is developed and used to perform a sensibility study on several geometrical parameters. Findings The influence of several parameters on the field homogeneity in the test sample, such as the geometrical dimensions of the yokes, the presence or not of holes drilled inside the test sample for B-coil placement as well as the size of the H-coils and B-coils, is addressed. Originality/value It is expected that this study will contribute to the optimization and standardization vertical RSSTs.

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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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Rotational Core Loss Magnetizer: Design and Measurements

Cited by 12 publications

References 24 publications

Developing High-Power-Density Electromagnetic Devices with Nanocrystalline and Amorphous Magnetic Materials

Developing High-Power-Density Electromagnetic Devices with Nanocrystalline and Amorphous Magnetic Materials

Influence of the geometric parameters of a vertical rotational single-sheet tester on sample field homogeneity

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

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