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Limitations and constraints of eddy-current loss models for interior permanent-magnet motors with fractional-slot concentrated windings
KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. (Electrical machines and drives laboratory)ORCID iD: 0000-0002-4534-921X
KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. (Electrical machines and drives laboratory)ORCID iD: 0000-0002-6283-7661
2017 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 10, no 3Article in journal (Refereed) Published
Abstract [en]

This paper analyzes and compares models for predicting average magnet losses in interior permanent-magnet motors with fractional-slot concentrated windings due to harmonics in the armature reaction (assuming sinusoidal phase currents). Particularly, loss models adopting different formulations and solutions to the Helmholtz equation to solve for the eddy currents are compared to a simpler model relying on an assumed eddy-current distribution. Boundaries in terms of magnet dimensions and angular frequency are identified (numerically and using an identified approximate analytical expression) to aid the machine designer whether the more simple loss model is applicable or not. The assumption of a uniform flux-density variation (used in the loss models) is also investigated for the case of V-shaped and straight interior permanent magnets. Finally, predicted volumetric loss densities are exemplified for combinations of slot and pole numbers common in automotive applications.

Place, publisher, year, edition, pages
MDPI AG , 2017. Vol. 10, no 3
Keyword [en]
Automotive applications, concentrated windings, eddy current losses, fractional-slot windings, interior permanent-magnet motors
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
SRA - Transport
Identifiers
URN: urn:nbn:se:kth:diva-204156DOI: 10.3390/en10030379ISI: 000398736700119OAI: oai:DiVA.org:kth-204156DiVA: diva2:1084162
Funder
StandUp
Note

QC 20170411

Available from: 2017-03-23 Created: 2017-03-23 Last updated: 2017-05-30Bibliographically approved
In thesis
1. On Electric Machinery for Integrated Motor Drives in Automotive Applications
Open this publication in new window or tab >>On Electric Machinery for Integrated Motor Drives in Automotive Applications
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Compact, electric drives for automotive traction applications represent animportant enabler towards realizing tomorrow’s fossil free transport solutions.One attractive solution is to integrate the power electronic converter withits associated electric machinery into a single unit. This thesis, along withits appended papers, considers design and analysis of electric machinery forintegrated electric drives intended for automotive applications. Particular focusis put on permanent-magnet synchronous machines (PMSMs) with interiormountedpermanent magnets combined with modular converter topologies.In the first part of the thesis, different converter concepts and windingarrangements suitable for an integrated drive are reviewed. Compared to theconventional solution utilizing a three-phase two-level converter, a compactintegration can be implemented by physically splitting the converter and itsassociated dc-link capacitor into a number of converter submodules. Moreover,a modular concept also enables a certain level of fault tolerance.In the second part of the thesis, fractional-slot concentrated windings(FSCWs) are analyzed. First, a review for how to determine suitable slot, pole,and phase combinations is identified considering mainly the winding factor forthe main harmonic and the associated rotor losses. Then, integrated modularconverter concepts and associated winding configurations are considered andslot, pole and phase combinations that also comply with the consideredmodular converters are proposed. Further, two possible winding arrangementssuitable for the stacked polyphase bridges (SPB) and the parallel polyphasebridges (PPB) type converter are compared with respect to torque duringpost-fault operation in the event of failure of a single converter submodule.In the third part, an iterative process adopting both finite element analysisand analytical techniques is proposed for the design of PMSMs with interiormountedpermanent magnets and FSCWs. The resulting machine designsillustrate tradeoffs in terms of fault tolerance, power factor, torque density,and potential for field-weakening operation. From a given set of specifications,an experimental prototype is also designed and built.Finally, since a FSCW generally results in a large harmonic content ofthe resulting flux-density waveform, models for predicting eddy-current lossesin the permanent magnets are analyzed and compared. Particularly, modelsadopting different formulations to the Helmholtz equation to solve for the eddycurrents are compared to a simpler model relying on an assumed eddy-currentdistribution. Boundaries in terms of magnet dimensions and angular frequencyare also identified in order to aid the machine designer whether the mostsimple loss model is applicable or not. With a prediction of the eddy-currentlosses in the permanent magnets together with a corresponding thermal model,predicted volumetric loss densities exemplified for combinations of slot andpole numbers common in automotive applications are presented along withthe associated thermal impact.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 55 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2017:036
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-207942 (URN)978-91-7729-381-1 (ISBN)
Public defence
2017-06-14, V1, Teknikringen 76, Stockholm, 10:15
Opponent
Supervisors
Note

QC 20170530

Available from: 2017-05-30 Created: 2017-05-29 Last updated: 2017-05-30Bibliographically approved

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