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Tooth Ripple Losses in Solid Salient Poles Review and Generalization Method for Concentrated Windings Machines
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
(English)In: IEEE transactions on energy conversion, ISSN 0885-8969, E-ISSN 1558-0059Article in journal (Refereed) Submitted
Abstract [en]

This paper presents a numerical method for rotor losses in solid salient poles calculation based on FEM. All literature available in the field refers to distributed windings with a homogeneous slot pitch. The method presented is applicable both to distributed and concentrated windings. A numerical analysis based on a concentrated winding machine is presented.

Keyword [en]
Eddy currents, finite-element analysis (FEA), magnetic losses, synchronous machines
Identifiers
URN: urn:nbn:se:uu:diva-157860OAI: oai:DiVA.org:uu-157860DiVA: diva2:436570
Available from: 2011-08-24 Created: 2011-08-24 Last updated: 2017-12-08Bibliographically approved
In thesis
1. FEM Analysis Applied to Electric Machines for Electric Vehicles
Open this publication in new window or tab >>FEM Analysis Applied to Electric Machines for Electric Vehicles
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Electric vehicle technology is an interdisciplinary field in continuous development. It appears to be a margin for improvements. The Division for Electricity at Uppsala University is doing significant research in the field. The present thesis investigates electric machines for vehicular applications, both in the driveline and in the traction motor.

Section 1 presents a driveline with two galvanically isolated voltage levels. A low power side is operated at the optimum voltage of the batteries, while a high power side is operated at a higher voltage leading to higher efficiencies in the traction motor. Both sides are coupled through a flywheel that stabilizes the power transients inherent to a drive cycle.

A review of electric machine topologies for electric vehicles is presented in Section 2. The permanent magnet excited machine is the most suitable technology for an electric driveline.

Section 3 is devoted to numerical models applied to electric machines. The equivalent circuit of a motor/generator with two sets of windings is first presented. This machine couples both sides of the driveline and drives the rotor of the flywheel. The electric parameters are calculated with custom FEM models. A discussion on slotless machines concludes with a simple model to analyze the magnetic field from one static 3D simulation. The tooth ripple losses in solid salient poles are also analyzed with a novel FEM approach. A complete description of the losses in electric machines gives a proper background for further discussion on efficiency.

Section 4 presents the experimental work constructed to validate the theoretical models. The experiments include an axial flux, single wounded prototype, an axial flux, double wound prototype and a planed radial flux coreless prototype.

Section 5 focuses on traction motors for electric vehicles. A simulated prototype illustrates a design and calculation process. The loss theory and the numerical methods presented in Section 3 are applied.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Uppsaliensis, 2011. 54 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 845
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Vehicle Engineering
Identifiers
urn:nbn:se:uu:diva-157879 (URN)978-91-554-8136-0 (ISBN)
Public defence
2011-10-07, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1,, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2011-09-16 Created: 2011-08-24 Last updated: 2011-11-03Bibliographically approved

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de Santiago, Juan

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