A horizontal-winding multi-permeability distributed air-gap inductor

Wang, Laili; Pei, Yunqing; Yang, Xu; Wang, Zhaoan; Liu, Yanfei

doi:10.1109/apec.2012.6165940

Cited by 13 publications

(5 citation statements)

References 19 publications

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“…Lim and Min et al [13] used multi-phase level-set model and used multi-material concept for maximizing EM force with set volume constraint of permanent magnet. Lailiwang [14] used multi-permeability material with distributed air gap to increase inductance without increasing the volume. Saling et al [15] highlighted the importance of probabilistic Design in avoiding rare event phenomena by computing failure analysis.…”

Section: Literature Reviewmentioning

confidence: 99%

Design optimization of large gap single axis thrust magnetic bearing actuator

Dash

Rajan

2015

JAE

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Magnetic Bearing, especially Active Magnetic Bearing (AMB) is arguably most preferred bearing for the process dealing with highly reactive environment, high speed operation and where the process required least contamination. They are also being tried for Fly wheels and Wind generators. They continue to be evolved since last several decades. Quite a few processes like application of AMB in high temperature Liquid Sodium high temperature applications call for development of large-working-gap active magnetic bearings (AMB). Smooth operation of AMB depends on hypersensitive position stiffness and Current stiffness, which fluctuates due to differential-thermal-expansion induced air gap variation. So, large gap, necessitates flatter open loop position stiffness than that of contemporary magnetic actuators. In this work, a goal seeking optimization methodology is employed for double acting AMB system where a combination of higher (CRGO electrical steel) and lower saturating magnetic material (Mu metal) is used. A less variant position stiffness across the air gap was arrived at after getting optimized design variables constituting geometry and excitation current parameters. This investigation opens up a new way to attain position stiffness in AMB system which is less sensitive to positional variation of rotor in air gap.This paper proposes an innovative and first-of-its-kind bi-material core material with goal driven optimized magnetic actuator design which can afford to have air gap variation during operation.

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Section: Literature Reviewmentioning

confidence: 99%

Design optimization of large gap single axis thrust magnetic bearing actuator

Dash

Rajan

2015

JAE

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“…In order to improve energy density, a variety of techniques have been reported in the literature [1][2][3][4][5][6][7][8][9] to minimize inductor volume without sacrificing performance. The matrix inductor from [2][3][4] has low profile and good heat dissipation, but it encounters non-uniform flux density among elements which results in poor space utilization.…”

Section: Introductionmentioning

confidence: 99%

“…The matrix inductor from [2][3][4] has low profile and good heat dissipation, but it encounters non-uniform flux density among elements which results in poor space utilization. With the purpose of fully utilizing magnetic material and achieving low profile inductor, the multi-permeability structure was discussed in [5] that employs changing permeability to achieve uniform flux density; coupled inductors with lateral flux structure discussed in [6] were proved to have higher density than vertical flux structure. Recently, the concept of constant-flux inductor (CFI) was demonstrated in [7] aiming at improving the space utilization by making the flux uniform throughout the core volume.…”

Section: Introductionmentioning

confidence: 99%

Design and evaluation of the constant-flux inductor with enclosed-winding

Cui

Ngo

Moss

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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The "constant-flux" concept introduced recently is leveraged to distribute magnetic flux to improve energy density, lowering the profile of an inductor. The optimal flux distribution with normalized parameters is identified mathematically, and verified by simulation. It is then applied to reduce the dc resistance of a commercial inductor by a factor of two, keeping the outer dimensions and inductance the same. Thermal-limited current rating is improved by 50%, whereas saturation-limited current rating is improved by 20% thanks to the suppression of flux crowding. The simulation result is verified by measurement results of a prototype under high current bias. I.

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“…Introduction: As magnetic components occupy a significant fraction of power converters' volume, a variety of techniques have been suggested to decrease the size of power inductors [1][2][3][4][5][6][7][8][9][10]. The matrix inductor [2,3] consists of multiple cores with windings interconnected.…”

mentioning

confidence: 99%

“…It has low profile and good heat dissipation, but sees non-uniform flux density within the elemental cores. To fully utilise magnetic material and achieve a low profile, the inductor structure proposed in [5] employs multiple permeabilities to distribute the magnetic flux uniformly. Coupled inductors with a lateral flux structure [6] proved to have higher energy density than the vertical flux structure.…”

mentioning

confidence: 99%

Constant‐flux inductor with enclosed winding for high‐density energy storage

Cui

Ngo

2013

Electron. lett.

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The 'constant-flux' concept has been described in a recent Letter as a way to utilise space more efficiently for inductor geometry with the core enclosed by winding. While the concept can conceptually be extended to the companion case of the inductor with winding enclosed by the core, structural synthesis is complicated by the absence of circular symmetry. Thus, this Letter delineates a procedure to shape the core and distribute winding turns to realise a magnetic field profile that is advantageous not only from the density standpoint, but also from the thermal standpoint via the reduction of hot spots, and from the reliability standpoint via the suppression of flux crowding. Design and fabrication results are delineated for a constant-flux inductor with the same specifications as a commercial counterpart, but the total height of the inductor is reduced by a factor of two.

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A horizontal-winding multi-permeability distributed air-gap inductor

Cited by 13 publications

References 19 publications

Design optimization of large gap single axis thrust magnetic bearing actuator

Design optimization of large gap single axis thrust magnetic bearing actuator

Design and evaluation of the constant-flux inductor with enclosed-winding

Constant‐flux inductor with enclosed winding for high‐density energy storage

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