Thursday 23 May 2024 at 4:00 PM CEST, 10:00 AM EST

By Rishabh Raj (Volvo Cars, Sweden) and Bernd Cebulski (Powersys, Germany)

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High-performance rotating electric machines are a necessity in the automotive sector. The manufacturing process of these machines leads to several impacts on the magnetic characteristics. Thus, total power losses of steel are one of the main components effected mainly during the press and shrink fitting of the stator housing, punching, and welding of laminations. The effect of punching has been widely accounted by most of the motor designers based on magnetic measurements and by using a loss factor to the power losses coming from fundamental sinusoidal excitation.
The webinar aims to present a methodology for accounting change in performance with effect of press and shrink fitting of stator housings. The implementation is computationally more efficient to perform in a finite element environment. A measurement setup is also discussed to account the effect of compressive stress and thereby, modifying the iron loss model. Eventually, the overall impact of compressive stress of machine performance and over important drive cycle will be discussed. Considering the audience, focus will be on efficient FEA computation with effect of stress and its impact on performance of a passenger vehicle.
At the end of the presentation there will be an introduction how to simulate and post-process some of the described effects and workflows in JMAG Designer, the leading tool for electromagnetic simulations in all types of electric machines.

Presenters’ bio:

Rishabh Raj is Electromagnetic Motor Design Engineer at Volvo Cars in Gothenburg Sweden. His main research interests are focused on iron loss modelling, material and measurements, and machine design of electrical drives used for transport electrification. He is co-author of about 6 scientific papers and 3 Indian Patents. He has completed his master’s degree in Electric Power Engineering from KTH Royal Institute of Technology from Stockholm, Sweden and has been working in the automotive industry for about two years since 2022.

Bernd Cebulski is Managing Director at Powersys GmbH in Chemnitz, Germany. His main interests are in electric machine design and control and their use and integration in electric vehicles. He has published many papers in the past and is a regular speaker in E/E conferences. He holds a master degree in E/E from University of Technology in Dresden, Germany and has more than 20 years experience in automotive industry.