Investigation of Proximity Losses in a High Speed Brushless Permanent Magnet Motor

Mellor, P.H.; Wróbel, Rafał; McNeill, Neville

doi:10.1109/ias.2006.256730

Cited by 106 publications

(66 citation statements)

References 3 publications

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“…There are two different phenomena that contribute to the total eddycurrent effect: skin effect and proximity effect which is also named as double sided skin effect [37]. The skin effect is the tendency for very high frequency currents to flow in the surface of the conductor and the proximity is the tendency for current to flow in other undesirable patterns that form a localized current distribution in the slot due to the presence of an external field which can be produced by either the magnets or adjacent surrounding conductors [38,39]. The effects are dependent on the physical structure of winding, conductor's length, slot dimensions and operating frequency.…”

Section: ) Copper Lossesmentioning

confidence: 99%

Analysis of Vertical Strip Wound Fault-Tolerant Permanent Magnet Synchronous Machines

Arumugam

Hamiti

Brunson

et al. 2014

IEEE Trans. Ind. Electron.

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Section: ) Copper Lossesmentioning

confidence: 99%

Analysis of Vertical Strip Wound Fault-Tolerant Permanent Magnet Synchronous Machines

Arumugam

Hamiti

Brunson

et al. 2014

IEEE Trans. Ind. Electron.

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“…33-35.54 W was obtained by placing strands in the centre of the slot, and moved them further from the tooth side to back iron where flux leakage crossing the slot window is smaller [4]. Furthermore, end-winding may produce significant proximity losses and thus influence eddy-currents circulation in conductors [17]. Figure 7b shows copper losses in the slot (P Cu_active-length ) and in the end-winding region (P Cu_end-winding ) separately.…”

Section: Resultsmentioning

confidence: 99%

Analysis of the proximity and skin effects on copper loss in a stator core

Młot¹,

Korkosz²,

Grodzki³

et al. 2014

Archives of Electrical Engineering

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Accurate prediction of power loss distribution within an electrical device is highly desirable as it allows thermal behavior to be evaluated at the early design stage. Three-dimensional (3-D) and two-dimensional (2-D) finite element analysis (FEA) is applied to calculate dc and ac copper losses in the armature winding at high-frequency sinusoidal currents. The main goal of this paper is showing the end-winding effect on copper losses. Copper losses at high frequency are dominated by the skin and proximity effects. A time-varying current has a tendency to concentrate near the surfaces of conductors, and if the frequency is very high, the current is restricted to a very thin layer near the conductor surface. This phenomenon of nonuniform distribution of time-varying currents in conductors is known as the skin effect. The term proximity effect refers to the influence of alternating current in one conductor on the current distribution in another, nearby conductor. To evaluate the ac copper loss within the analyzed machine a simplified approach is adopted using one segment of stator core. To demonstrate an enhanced copper loss due to ac operation, the dc and ac resistances are calculated. The resistances ratio ac to dc is strongly dependent on frequency, temperature, shape of slot and size of slot opening.

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“…In literature, proximity losses are researched thoroughly and methods for reducing them are presented where it has been reported that these losses can be reduced by an appropriate winding arrangement in the slot [6]. Alternative analytical methods [1,3,5,7] are also proposed to predict proximity losses within acceptable accuracy and less computation time.…”

Section: Introductionmentioning

confidence: 99%

Modeling and analysis of eddy current losses in permanent magnet machines with multi-stranded bundle conductors

Arumugam

Dusek

Mezani

et al. 2016

Mathematics and Computers in Simulation

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. (2015) Modeling and analysis of eddy current losses in permanent magnet machines with multi-stranded bundle conductors. Mathematics and Computers in Simulation, Access from the University of Nottingham repository: http://eprints.nottingham.ac.uk/36143/1/Modelling%20and%20analysis%20of%20eddy %20current%20losses%20in%20permanent%20magnet%20machines%20with%20multi-stranded%20bundle%20conductors.pdf The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractThis paper investigates the influence of eddy current losses in multi-stranded bundle conductors employed in outrunner permanent magnet machines, by adopting an analytical model. The analytical model is based on a sub-domain field model that solves the two-dimensional magnetostatic problem using the separation of variables technique for each of the non-magnetically permeable machine sub-domains: PM, airgap and slots. The validity and accuracy of the proposed model is verified using finite element analysis and then used to investigate the eddy current losses. The machine considered for the analysis has 36 slots and 42-poles previously designed for aircraft taxiing. The influence of the number of turns and the conductor cross-sectional area are investigated. It is shown that efficiency can be improved considerably by the choice of multi-stranded bundle conductors.

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Investigation of Proximity Losses in a High Speed Brushless Permanent Magnet Motor

Cited by 106 publications

References 3 publications

Analysis of Vertical Strip Wound Fault-Tolerant Permanent Magnet Synchronous Machines

Analysis of Vertical Strip Wound Fault-Tolerant Permanent Magnet Synchronous Machines

Analysis of the proximity and skin effects on copper loss in a stator core

Modeling and analysis of eddy current losses in permanent magnet machines with multi-stranded bundle conductors

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