Influence of the Distributed Air Gap on the Parameters of an Industrial Inductor

Jez, Radoslaw

doi:10.1109/tmag.2017.2699120

Cited by 31 publications

(15 citation statements)

References 4 publications

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“…The volume of gaps depends on the reactive power and the selected magnetic inductance. However, the gaps are also reasons to flux fringing along the gaps [6][7][8] which increases the power losses in the shunt reactor. The gap needs to be divided into several smaller gaps to reduce the effect of the flux fringing, thereby reducing power losses in the shunt reactor.…”

Section: Imentioning

confidence: 99%

Finite Element Modeling of Shunt Reactors Used in High Voltage Power Systems

Minh

Duc

Hoai

et al. 2021

Eng. Technol. Appl. Sci. Res.

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Shunt reactors are important components for high-voltage and extra high voltage transmission systems with large line lengths. They are used to absorb excess reactive power generated by capacitive power on the lines when no-load or under-load occurs. In addition, they play an important role in balancing the reactive power on the system, avoiding overvoltage at the end of the lines, and maintaining voltage stability at the specified level. In this paper, an analytical method based on the theory of magnetic circuit model is used to compute the electromagnetic fields of shunt reactors and then a finite element method is applied to simulate magnetic field distributions, joule power losses, and copper losses in the magnetic circuit. In order to reduce magnetic flux and avoid magnetic circuit saturation, it is necessary to increase the reluctance of the magnetic circuit by adding air gaps in the iron core. The air gaps are arranged along the iron core to decrease the influence of flux fringing around the air gap on shunt reactors' total loss. Non-magnetic materials are often used at the air gaps to separate the iron cores. The ANSYS Electronics Desktop V19.R1 is used as a computation and simulation tool in this paper.

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Section: Imentioning

confidence: 99%

Finite Element Modeling of Shunt Reactors Used in High Voltage Power Systems

Minh

Duc

Hoai

et al. 2021

Eng. Technol. Appl. Sci. Res.

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“…It indicated that higher number of air‐gap could reduce the magnetic component power losses. This research, however, looks at the air‐gap arrangement in the inductors related to much higher frequency when compared with Jez's work [3]. Ayachit et al.…”

Section: Introductionmentioning

confidence: 97%

“…Currently, Jez focused on the influence of different air‐gap arrangement of low frequency inductors [3]. It indicated that higher number of air‐gap could reduce the magnetic component power losses.…”

Section: Introductionmentioning

confidence: 99%

“…The gapped inductor is useful in many places, particularly for the applications that need to avoid working in the current saturation situation. These air‐gaps affect the magnetic circuit in many aspects, such as changing the shape of the B‐H curve, reducing the inductance effectiveness, increasing the saturation current capability to avoid magnetic components saturation, and causing the fringing flux phenomenon [3]. Therefore, the arrangements of air‐gap placements are the main research purpose in this study.…”

Section: Introductionmentioning

confidence: 99%

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Design process of high‐frequency inductor with multiple air‐gaps in the dimensional limitation

Liao

Chen

2021

The Journal of Engineering

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To find the optimal magnetic components designing process within the dimensional limitation, different inductor arrangements are developed. Different combinations of air‐gaps and material arrangements are used within the limited bobbin space to improve the saturation current capacity within the already set dimension. In this study, the mechanism requirement set at 1U height is the limitation. There are two center‐pole material cores, and air‐gap distribution arrangement in the magnetic components. The saturation current value, magnetic flux density, flux fringing, and power loss of inductors are investigated with simulation, equation calculation and actual circuit measurement. The magnetic distribution affects the inductor performance because of the different relative permeability values, skin effect, proximity effect, and fringing effect. This research uses equations to find the magnetic flux density and the fringing magnetic flux, and uses Comsol Multiphysics® software to simulate the magnetic field. A 500 W boost power factor corrections (PFC) converter topology is used as an example experiment to compare and verify the inductors selected with proposed design methodology. Finally, the most appropriate core is chosen to implement the two‐stage AC/DC power supply products to improve the power supply performance.

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“…One way to reduce the hot spots in the core is through the use of high-thermal-conductivity heat spreaders placed around the gap [18], for example using aluminum nitride. Further, a number of methods have been proposed to reduce gap losses including the use of multiple smaller gaps around the magnetic circuit [19], cutting slits in the cores near the air gap [20], or splitting the core into several sub-cores placed side-by-side [21]. More complex sub-sectioning of the core has also been proposed [22].…”

Section: Introductionmentioning

confidence: 99%

Rapid Thermal Analysis of Nanocrystalline Inductors for Converter Optimization

Scoltock

Wang

Calderon-Lopez

et al. 2020

IEEE J. Emerg. Sel. Topics Power Electron.

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To capitalize fully on modern component technologies such as nanocrystalline cores and wide-bandgap devices, multi-objective converter design optimization is essential, requiring simple, accurate component models. In this work, a lumped parameter thermal model is presented for nanocrystalline inductors with ceramic heat spreaders. The key challenge is the non-uniform loss distribution in gapped, tape-wound cores, particularly the high loss densities adjacent to the gaps. However, uneven loss distributions are not handled easily by lumped-parameter techniques. It is shown that by treating the ceramic heat spreaders as 'passive' heat sources, a simple thermal model of the inductor can be derived to estimate the hot spot temperature of the core. The model is validated through comparison with 3-D finite element analysis (FEA) and experimental measurements on a 60 kW DC-DC converter. The proposed model offers a comparable level of accuracy to FEA with a fraction of the running time, executing in 99 µs in MATLAB.

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Influence of the Distributed Air Gap on the Parameters of an Industrial Inductor

Cited by 31 publications

References 4 publications

Finite Element Modeling of Shunt Reactors Used in High Voltage Power Systems

Finite Element Modeling of Shunt Reactors Used in High Voltage Power Systems

Design process of high‐frequency inductor with multiple air‐gaps in the dimensional limitation

Rapid Thermal Analysis of Nanocrystalline Inductors for Converter Optimization

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