Efficient Technique for 3-D Finite Element Analysis of Skin Effect in Current-Carrying Conductors

Kim, Hong‐Kyu; Jung, Jaewoon; Park, Kyong-Yop; Im, Chang‐Hwan; Jung, Hyun-Kyo

doi:10.1109/tmag.2004.824566

Cited by 16 publications

(3 citation statements)

References 5 publications

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“…Such conductors are typically placed randomly inside the stator slot [29]. Additionally, these conductors can be divided into multiple parallel strands for a better mitigation of AC high frequency losses caused by skin and proximity effects [30,31]. These windings have also high mechanical fixability, and consequently easier manufacturability and lower cost.…”

Section: Single Round and Stranded Wiresmentioning

confidence: 99%

Electrical Machines Winding Technology: Latest Advancements for Transportation Electrification

2022

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The ever-increasing demand for higher-power dense electrical machines has resulted in different electrical, mechanical, and thermal stresses, which can eventually cause machine failure. For this reason, the management of stresses and losses must be thoughtfully investigated to have a highly reliable electrical machine. The literature agrees that winding losses are the dominant loss mechanism in many electrical machines. However, statements vary on how to mitigate these losses along with the aforementioned stresses. To avoid winding failure, a study of the various winding topologies would allow for a better consideration of the challenges and limitations in the performance of different electrical machines. To this aim, this paper introduces a comprehensive review for different winding topologies. Many reported cases in the literature are summarized and compared. Moreover, the utilization of additive manufacturing (AM) in the production of the machine windings is presented, showing a high level of maturity of this emerging technology. Finally, different challenges facing the design of machine windings are introduced including the AC high frequency losses, thermal management, mechanical and acoustic problems, insulation aging, automated production, and winding manufacturability.

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Section: Single Round and Stranded Wiresmentioning

confidence: 99%

Electrical Machines Winding Technology: Latest Advancements for Transportation Electrification

2022

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“…The analysis of temperature rise process in GIB is a coupled magnetic eddy current, fluid and thermal problem. In currently available thermal models, the finite-element method (FEM) has been most widely used [1][2][3][4][5]. However, the heat transfer problem is less understood for the difficulty in applying the convective heat transfer coefficient on the enclosure surface, which depends on many factors such as surface location, model geometry, as well as ambient temperatures [5].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Eddy-Current, Fluid and Thermal Coupled Model for the Finite Element Behavior of Gas-Insulated Bus Bars

Wu¹,

Zhou²,

Pei³

2016

Proceedings of the 2015 4th International Conference on Sensors, Measurement and Intelligent Materials

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This paper describes a coupled magnetic eddy-current, fluid and thermal finite-element model to analyze the steady and transient thermal behavior of a three-phase gas-insulated bus bar (GIB). The magnetic eddy-current field is indirectly coupled into the fluid and thermal fields through the power loss density while considering the temperature dependent electrical conductivity. As a new methodology, multiple species transport technique is introduced into the thermal model using computational fluid dynamics (CFD), circumventing the difficulty of applying temperature and geometry dependent heat transfer coefficient on the model boundaries. Good agreement is found between the CFD and experimental results. The proposed methodology is further used to predict the steady and transient thermal behaviors of the GIB under the effects of various gas pressures, gas types, electrical loads, and ambient temperatures, which provides useful sensitivity information for GIB designers in the product development process.

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“…Ausserhofer [16] solved the skin effect problem of the static electromagnetic field using fixed-point computing technology using both the time domain and frequency domain methods. With the development of numerical calculation and finite element simulation technology, numerical simulation of the skin effect problem is studied by many scholars [17][18][19] . However, the study still focuses on the impact of frequency changing on the resistance, inductance and the efficiency of the current transmission.…”

Section: Introductionmentioning

confidence: 99%

A frequency domain method for the pulse current skin effect in the passive electromagnetic armor

Yuan

Lei

et al. 2014

2014 17th International Symposium on Electromagnetic Launch Technology

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To confirm the action mechanism of the passive electromagnetic armor (PEA), the pulse current skin effect in the PEA are researched. Considering the different characteristic of pulse current from the time-harmonic current, a frequency-domain analysis method of skin effect is introduced. With the background of PEA, time and frequency characteristics of pulse current are analyzed based on the equivalent circuit model, and calculation method of pulse current density distribution in SCJ is obtained. Consequently the change rule of the skin depth during the discharging is researched. The validity of the analysis method is approved by contrasting with the FEM analysis results. Finally, distribution of the specific action in the shaped charge jet elements is obtained based on action time model. The results indicate that, pulse current is broadband distribution, and its skin effect phenomena is different from unifrequent time-harmonic current. It shows that current density increases with depth decreases not all the time, but declines on the surface of the conductor at the trailing edge of the pulse current. And the specific action is concentrated on the tail of the jet whose velocity is less than 4km/s. While the action in the radius direction becomes larger as the element closer to the surface

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Efficient Technique for 3-D Finite Element Analysis of Skin Effect in Current-Carrying Conductors

Cited by 16 publications

References 5 publications

Electrical Machines Winding Technology: Latest Advancements for Transportation Electrification

Electrical Machines Winding Technology: Latest Advancements for Transportation Electrification

Magnetic Eddy-Current, Fluid and Thermal Coupled Model for the Finite Element Behavior of Gas-Insulated Bus Bars

A frequency domain method for the pulse current skin effect in the passive electromagnetic armor

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