An Adaptive FEM Based on Magnetic Field Conservation Applying to Ferromagnetic Problems

Noguchi, So; Matsutomo, Shinya; Čingoski, Vlatko

doi:10.1109/tmag.2017.2754862

Cited by 2 publications

(1 citation statement)

References 10 publications

(11 reference statements)

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“…Conventionally, it is hard to optimize the dimensions of DC bus bar entirely because of the limitations of mechanical structures. The existing analysis methods paying attention to the bus bar stray parameters are based on the numerical software simulation tools such as partial element equivalent circuit (PEEC) (Jiang and Wu, 2019) or finite element method (FEM) (Noguchi et al, 2018) and measurement-based methods such as the time-domain reflectometry (TDR) method (Kim et al, 2017). The PEEC divides the entire bus bar into countless small ones and solves the small equivalent circuit.…”

Section: Introductionmentioning

confidence: 99%

Analysis of DC bus bar dominant stray parameters based on equivalent calculation models

et al. 2019

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Purpose This paper aims to analyze the dominant stray parameters of the DC bus bar and focus on weakening the influence of the stray parameters instead of reducing the value of the stray parameters in DC bus bar while switching. By finding the mechanisms to reduce the effects of stray parameters on switching transient, the simple and straightforward optimization methods could be given for the engineering designer. Design/methodology/approach The investigations are focused on the equivalent circuit by segmented impedance evaluation in the low-frequency band and the energy propagation by wave impedance evaluation in the high frequency band. This paper proposes an equivalent impedance calculation model to locate the dominant stray parameters in the DC bus bar and takes the energy propagation characteristics using wave impedance into consideration, which can simplify the optimization design of DC bus bar. Findings According to the equivalent circuit and electromagnetic field analysis, this paper proves the existence of the dominant stray parameters in DC bus bar that is widely used on high-power converters and certifies that not all the stray parameters in different areas of DC bus bar have the same effects on switching process, which can give a good guidance for the optimization design of DC bus bar. Originality/value The positions of DC-link capacitors, resulting in only part of stray parameters in DC bus bar has more impact during switching, are significant to the DC bus bar optimization design. These stray parameters named dominant stray parameters in this paper play a leading role in the switching transient process. The area of DC bus bar, which is close to IGBTs and far from DC-link capacitors, contains the dominant stray parameters in the switching transient process. Therefore, the distance between DC-link capacitors and IGBTs should be shortened as much as possible. Based on the results, the efficiency for the DC bus bar optimization design could be improved by weakening the influence of the stray parameters, such as reducing the dominant stray parameters only. Therefore, it can save the cost and time of DC bus bar optimization design.

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Section: Introductionmentioning

confidence: 99%

Analysis of DC bus bar dominant stray parameters based on equivalent calculation models

et al. 2019

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An improved subdomain modeling technique for surface-mounted permanent magnet Vernier motor

Bao,

Chang,

Zhang

2024

JAE

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This work aims to provide a unique analytical model designed for calculating the magnetic field of a surface-mounted permanent magnet Vernier motor (SPMVM). The model is created utilizing the separation variable method to solve Laplace or Poisson equations of the vector magnetic potential in a quasi-Cartesian coordinate system subdomain model. The theoretical justifications for the final analytical equations of electromagnetic torque, no-load back-EMF, stator inductance, and magnetic flux density distribution are given in detail. Then the solution of the equation is expressed in the form of a hyperbolic function. Furthermore, the improved analytical method in the study is generic and can be applied to estimating the parameters of machines with different design concepts. Finally, FEM is employed as the reference for comparison between other models. Compared to the original subdomain model, the calculation results of the improved analytical model are more time-efficient and closer to those of FEM. In addition, the improved analytical method can reduce the dimension of the coefficient matrix and improve the calculation speed. The SPMVM prototype is then built to demonstrate the validity and feasibility of the improved subdomain method and serves as a guide for future SPMVM development.

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An Adaptive FEM Based on Magnetic Field Conservation Applying to Ferromagnetic Problems

Cited by 2 publications

References 10 publications

Analysis of DC bus bar dominant stray parameters based on equivalent calculation models

Analysis of DC bus bar dominant stray parameters based on equivalent calculation models

An improved subdomain modeling technique for surface-mounted permanent magnet Vernier motor

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