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RWTH Aachen-led anfaHair project develops new joining technologies for hairpin stators

The Production Engineering of E-Mobility Components (PEM) of RWTH Aachen University has successfully completed the anfaHair research project after two years. The goal of the project, which was funded by the Federal Ministry for Economic Affairs and Climate Action, was to make the production of new types of electric motors more efficient on an industrial scale.

The PEM team worked with the Berlin-based mechanical engineering company Röscher to develop four potentially marketable joining technologies for the manufacturing process of hairpin stators.


Hairpin stators of different sizes © PEM RWTH Aachen University | Patrizia Cacciotti

The hairpin design with its plug-in coil structure made of solid copper wires is increasingly displacing conventional wire winding techniques. In the corresponding process chain, the focus is currently on laser contacting of the numerous copper ends, but welding defects in series production have so far led to high scrap rates and low system efficiency.

The anfaHair research project was intended to decouple the two processes of geometric weld preparation and subsequent contacting and produce a precise joining procedure. The procedure should then be integrated into the hairpin process chain, where it should enable reproducible and dimensionally stable alignment of the copper wires prior to welding and thus increase both the quality and the stability of the overall process chain.

In addition to its university research projects, the PEM chair also regularly works with partners from industry to optimize existing production processes in terms of sustainability or to develop new processes. The results from anfaHair are now to be further exploited in the form of scientific and industrial projects.

Meanwhile, the partner company Röscher is planning to further develop the prototype station set up in the course of the project for industrial and serial applications. According to Röscher, initial inquiries from other companies have already been received. In parallel, the applicability of the system in related areas will be tested.


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