Rapid analytical optimization of eddy current shield thickness for associated loss minimization in electrical machines

Shah, M.R.; Lee, Sang Bin

doi:10.1109/iemdc.2005.195891

Cited by 24 publications

(25 citation statements)

References 5 publications

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“…It is evident that the four sine terms in (12) have the same frequency but different amplitude and phase angle, and the fundamental frequency of the induced eddy current is . Substituting (12) into (11) and using the orthogonal property of trigonometric functions (13) the nonzero terms in the integration are given by (14) where is a loss component independent of the angular position of the th segment, and can be evaluated using (8) given in [6]. Detailed derivation of (14) and definition of are given in Appendix B.…”

Section: Eddy-current Loss In Rotor Magnetsmentioning

confidence: 99%

“…Substituting (12) into (11) and using the orthogonal property of trigonometric functions (13) the nonzero terms in the integration are given by (14) where is a loss component independent of the angular position of the th segment, and can be evaluated using (8) given in [6]. Detailed derivation of (14) and definition of are given in Appendix B. The second term in (14) is proportional to , and, hence, is dependent on the relative position of the segment within a pole pitch.…”

Section: Eddy-current Loss In Rotor Magnetsmentioning

confidence: 99%

“…ii) When the resistance limited model is employed to quantify 3-D eddy-current loss in PM brushless machines via magnetostatic analogy [23], the total loss cannot be determined by calculating loss in one magnet segment and multiplying the result by the number of segments. The number of segments to be calculated is dependent on the symmetry of the loss distribution and can be determined using (14).…”

Section: Eddy-current Loss In Rotor Magnetsmentioning

confidence: 99%

“…Since the eddy loss in equally segmented magnets is not the same, the total eddy-current loss cannot be evaluated by computing eddy-current loss in one segment. The number of magnet segments need to be modelled for 3-D magnetostatic calculation in order to predict the total eddy-current loss can be determined by (14) for a given number of segments per pole. For the example given in Fig.…”

Section: Validation By Finite-element Analysismentioning

confidence: 99%

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Rotor Eddy-Current Loss in Permanent-Magnet Brushless AC Machines

et al. 2010

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Article:Wang, J., Atallah, K., Chin, R. et al. (2 more ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. This paper analyzes rotor eddy-current loss in permanent-magnet brushless ac machines. It is shown that analytical or finite-element techniques published in literature for predicting rotor eddy-current loss using space harmonic based approaches may not yield correct results in each magnet segment when one magnet-pole is circumferentially segmented into more than two pieces. It is also shown that the eddy-current loss in each equally segmented piece may differ by a large margin, which implies that the temperature distribution in the magnets will be uneven and the risk of demagnetization has to be carefully assessed. The theoretical derivation is validated by time-stepped transient finite-element analysis.Index Terms-Eddy-current loss, permanent-magnet brushless machines.

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Section: Eddy-current Loss In Rotor Magnetsmentioning

confidence: 99%

Section: Eddy-current Loss In Rotor Magnetsmentioning

confidence: 99%

Section: Eddy-current Loss In Rotor Magnetsmentioning

confidence: 99%

Section: Validation By Finite-element Analysismentioning

confidence: 99%

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Rotor Eddy-Current Loss in Permanent-Magnet Brushless AC Machines

et al. 2010

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“…Magnet losses and eddy current losses induced in the solid rotor yoke are calculated by the method found in [17], [18]. This method efficiently takes all harmonics produced by the stator into account, which is of particular importance in machines with single layer concentrated windings, where especially the low order harmonics can cause large rotor losses.…”

Section: Lossesmentioning

confidence: 99%

Gradient based optimization of Permanent Magnet generator design for a tidal turbine

Røkke

2014

2014 International Conference on Electrical Machines (ICEM)

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Abstract-An optimization of an analytical problem with nine variables is executed to find the optimal Permanent Magnet(PM) generator for a tidal turbine. A gradient based solver is used to find the minimum cost of active materials for the given design specifications. The MATLAB function fmincon is used, and the possible minimization algorithms available for this function are compared. As these solvers are only able to find a local minimum, a search is performed trying to find other minimas, both using a MultiStart procedure and using a Genetic Algorithm (GA). Losses are calculated for windings, stator laminations and rotor magnets and solid steel, and a constraint is put on efficiency. The cost effect of varying this constraint is investigated. Optimizations are done with both weight and material cost as objective function, and the different resulting designs are presented.

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Torque and torque components in high-speed permanent-magnet synchronous machines with a shielding cylinder

Hannon

Sergeant

Dupr

2016

Mathematics and Computers in Simulation

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A demand for more efficient electrical machines with a high power density is driving the interest for high-speed permanent-magnet synchronous machines (PMSMs). However, the design of such machines is a challenging task. One of the problems is that the effect of the shielding cylinder, a conductive sleeve around the magnets, on the machine's performance has not been studied extensively. To cope with that problem the authors of this work introduce an analytical method to study the torque in high-speed PMSMs. The presented method implies dividing the torque in two components, depending on how they are produced. The method is successfully validated and an illustration of its advantages is provided.

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Rapid analytical optimization of eddy current shield thickness for associated loss minimization in electrical machines

Cited by 24 publications

References 5 publications

Rotor Eddy-Current Loss in Permanent-Magnet Brushless AC Machines

Rotor Eddy-Current Loss in Permanent-Magnet Brushless AC Machines

Gradient based optimization of Permanent Magnet generator design for a tidal turbine

Torque and torque components in high-speed permanent-magnet synchronous machines with a shielding cylinder

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