Preload dependent material properties of lamination stacks for electric machines

Daniel Loos; Endre Barti; Rainer Wagener; Tobias Melz

doi:10.3139/120.111434

Artikel

Preload dependent material properties of lamination stacks for electric machines

Daniel Loos , Endre Barti , Rainer Wagener und Tobias Melz

Veröffentlicht/Copyright: 18. November 2019

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Aus der Zeitschrift Materials Testing Band 61 Heft 12

Abstract

The design of electric machines is motivated by electromagnetic and mechanical requirements. The magnetic flux is confined and guided by ferrite cores which consist of coated electrical sheets with a thickness of only a few tenths of a millimeter in order to minimize the eddy current losses. This heterogeneous structure causes preload dependent transversal isotropic material properties which affect the fatigue behavior and structural dynamic behavior of the machine. The material constitutive equations are defined by five parameters which must be derived from experimental investigations with respect to compression in the stacking direction. In this paper, a test procedure is introduced to determine the elastic and torsional stiffness as well as the lateral elongation of the stack depending on its preload.

*Correspondence Address, MSc Daniel Loos, BMW Group, Taunusstr. 41, 80807 München, Germany, E-mail: Daniel.Loos@bmw.de

MSc Daniel Loos, born in 1989, studied mechanical engineering at the TU Munich and started working as a PhD student at the BMW Group focusing on fatigue in high voltage machines. In 2017, he joined the division of electric drive units and has been working as a Design, Calculation and Test Engineer since then.

Dr.-Ing. Endre Barti, born in 1966, studied mechanical engineering at the Transylvania Technical University, Brasov, Romania. In 2003 he received his Ph.D. degree from the Technical University, Munich. From 2003 to 2011 he collaborated with Siemens Corporate Technology in Munich. In 2011 he joined the BMW Group and has been working as a Calculation Engineer in the division of electric drive units. He was responsible for development of methods in structural mechanics simulation.

Dr.-Ing. Rainer Wagener, born in 1975, absolved his studies in Mechanical Engineering at TU Clausthal, Germany and worked at the Institute of Plant Engineering and Fatigue Analysis IMAB where he received his PhD. After an interval as a Test Engineer for a German automotive supplier, he started working at the Fraunhofer LBF in Darmstadt, Germany where he is manager of the group “Component-Related Material Behavior”.

Prof. Dr.-Ing. Tobias Melz, born 1968, studied Mechanical Engineering and Lightweight Design at the TU Braunschweig, Germany. In 2002, he received his PhD at the TU Darmstadt. Since 2001, he has been engaged in several leading positions at the Fraunhofer LBF. Presently, he is the Director of the Fraunhofer Institute for Structural Durability and System Reliability LBF as well as the Head of the Chair System Reliability, Adaptive Structures, and Machine Acoustics SAM at the TU Darmstadt, Germany.

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Published Online: 2019-11-18

Published in Print: 2019-12-02

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https://doi.org/10.3139/120.111434