![]() ![]() Something that was lighter, more efficient, mass producible in volume. And the idea was to say, what could be created for the electric car industry in 10 or 15 years from now that they would need, that we could meet. We started with a blank sheet of paper at the beginning of my Ph.D. What was different about the engine you came up with? What is so exciting for us is we get to innovate fast, and that’s where the partnership with Mercedes is really interesting. There’s nothing more exciting for an engineer than a period of revolution because the speed of innovation is what’s important. We’re now 10 years into a 20-year revolution, every new car that gets sold in 10 years will be electric, no question. TW: We started just over 12 years ago with really one remit: Let’s accelerate electric cars, let’s do anything we can to make electric cars happen faster. I caught up with him to find out what’s next. Tim Woolmer, YASA’s founder and CTO, invented this very new approach to electric motor design. This makes them one-third the weight of other electric motors, more efficient and with 3x higher power densities than Tesla. Even Tesla relies on radial electric motors, a legacy technology more than 40 years old with very little left to give in terms of innovation.īut YASA’s axial-flux design, which has very thin segments, means they can be combined into powerful single drive units. YASA’s axial-flux electric motors generated EV industry interest because of their efficiency, high power density, small size and low weight.īy contrast, the “radial” electric motor design is more common in today’s EV market. The company will retain its own brand, team, facilities and location in Oxford. as a fully owned subsidiary, serving both Mercedes-Benz and existing customers like Ferrari. ![]() But YASA is likely to be an entity worth watching.įounded in 2009 after being spun out of Oxford University, YASA will now develop ultra-high-performance electric motors for Mercedes-Benz’s AMG.EA electric-only platform. The acquisition didn’t exactly garner enormous press attention, as scant other details were announced. The performed work has shown that this kind of axial flux switched reluctance motors can hardly reach the torque density and efficiency provided by high performance permanent magnet motors, but they can offer a better constant power speed range and a simpler, safer, more reliable, cost-effective design.Back in July, YASA (formerly Yokeless And Segmented Armature), a British electric motor startup with a revolutionary “axial-flux” motor, was acquired by Mercedes-Benz. As a good static performance does not necessarily ensure a good dynamic performance, a dynamic simulation model has also been developed to evaluate the dynamic performance of the designed motors with different control strategies and complete the aforementioned guidelines.įinally, using the developed tools, a motor prototype has been designed, manufactured, assembled, tested in a test bench, integrated on a commercial electric vehicle and further tested in a commercial vehicle testing platform, obtaining a good correlation among analytical, FEM and experimental results. After a successful validation based on 3D Finite Element simulations and test bench results, this tool has been used for understanding the influence of each design parameter on the static motor performance and providing design guidelines. With the aim of providing a suitable magnet-free alternative to these motors, the promising, little explored, axial flux switched reluctance technology has been selected in this thesis to develop a high torque density and efficiency motor, suitable for cost-effective mass production.Īs suitable tools do not exist for designing this type of machines from scratch, first an analytical sizing and calculation tool has been developed. Another obstacle is the supply of the permanent magnets required by the electrical motors most commonly employed in electric vehicles, as 95% of the global supply is provided by China, generating important supply and cost uncertainties. Vehicle electrification is fundamental to decrease the pollution generated by circulation and improve the quality of life of urban populations but pure electric vehicle has not been extended so far mainly due to the insufficient energy density of batteries. ![]() Author: Ismael Ruiz de Argandoña Arzallus Thesis director Javier Poza, Mondragon Unibertsitatea 2018
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