Margaux TOPENOT : "Design and dynamic strength of electric rotor parts under PWM dynamic excitations""

PhD works of Margaux TOPENOT : "Design and dynamic strength of electric rotor parts under PWM dynamic excitations"

Abstract : Pulse Width Modulation (PWM) control of electric motors induces torque oscillations over a wide frequency range and with large amplitudes. These excitations can lead to the rupture of rotating parts. The PWM control coupled with simplified mechanical models often leads to oversizing of complex rotors. The objective of this thesis is to provide confident models describing the dynamic behavior when excited by PWM strategies. The first methodological contribution consists in a reduced order modelling strategy of the mechanical model of the rotor based on a projection basis linking the DOFs of the complete model to the rotation DOFs of the reduced model. In addition, the computation of stresses in the rotating parts during a speed-up is obtained by expanding the solution obtained from the resolution of the problem in the reduced space. The second contribution focuses on the dynamic behavior of the laminated stack. An asymptotic non-linear homogenization methodology is proposed. The equivalent elasticity moduli of the laminated stack are estimated from a series of non-linear quasi-static computations and by the prediction of the assembly preload. The results of this method are compared to experimental tests on both academic and industrial cases.

Jury composition :

Etienne Balmès          Professeur des Universités, Arts et Métiers ParisTech, Reporter

Régis Dufour              Professeur des Universités, INSA Lyon, Reporter

Vincent Lanfranchi    Professeur des Universités, UTC, Reviewer

Gaël Chevallier          Professeur des Universités, FEMTO-ST, PhD Director

Morvan Ouisse           Professeur des Universités, FEMTO-ST, PhD Co-director

Damien Vaillant         Responsable Calculs Mécaniques, Alstom, Invitee

Jean-Pierre Lombard Responsable Technique, Alstom, Reviewer

Localization : Amphithéâtre J.-J. GAGNEPAIN du bâtiment Femto-ST TEMIS (15B Avenue des Montboucons, 25000 Besançon)