Scalable Platform for an Efficient 400-Volt Axle Drive

Authors

Dr. G. Rösel, N. Daun, P. Mönius, G. Mühlberg, A. Reich, Vitesco Technologies, Regensburg / Nuremberg / Berlin

Year

2021

Print Info

Production/Publication ÖVK

Summary

As the market success of electric vehicles accelerates significantly, the momentum and variance in the brands, segments and models on offer is continuously increasing This increases the importance of the greatest possible scalability of electric drives. Electric axle drives, such as the EMR3 (Electronics Motor Reducer 3rd generation) in volume production and the EMR4 currently in development and presented here, can optimally meet these requirements in a highly integrated unit design with multi-criteria optimization at system level. Compared with the predecessor generation, the EMR4 delivers up to 5% increased efficiency, significantly freer power scaling, and substantial cost reductions.
The enhanced efficiency and performance of the drive in particular contribute to attractive handling and vehicle characteristics. To facilitate progress with the EMR4, numerous effect chains in the axle drive have been further optimized down to the smallest detail. In the interests of scalability, many internal and external interfaces have also been standardized to ensure that the three main components – power electronics, electric motor, and reducer – can be combined as freely as possible in line with the tailored-off-the-shelf principle. With regard to the drive’s acoustic comfort, another focus was and remains the simulation, testing and optimization of the drive’s noise characteristics (noise vibration harshness) throughout the entire operating map. Comprehensive industrialization expertise from the previous generations of axle drive systems has been incorporated in the development of the EMR4 right from the outset.

Number of pages

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