How can more composites be incorporated into EV powertrains?

Louise Smyth

Drive System Design (DSD) is the lead partner in a new effort that seeks to improve the efficiency of the integrated electric drive unit (EDU) of electric vehicles (EVs). The 12 month project, part-funded by Innovate UK and with the National Composites Centre (NCC) as partner, will investigate the use of composites to enable increased power density and reduced unit size, offering vehicle manufacturers further packaging and efficiency benefits.

“Vehicle range at reasonable cost is still one of the biggest barriers to widespread adoption of EVs, so technology that can increase this through efficiency gains – without adding significantly to unit cost – are crucial,” said Markus Hose, DSD Head of Mechanical Engineering. “Vehicle manufacturers are facing increasing packaging challenges as they seek to incorporate higher performance EDUs into latest designs, so power density improvements will offer a key competitive advantage.

“NVH and efficiency have traditionally been at odds during vehicle powertrain development, but through this project DSD aims to overcome this challenge,” added Hose. “Historically, attributes have been managed independently. For example, efficient designs can be created, but iterative work is typically required to overcome the resulting NVH challenges. This project considers that from the outset and is central to any decision making, resulting in an EDU optimised for real-world operation.”   

The project addresses the challenge of effectively balancing NVH and efficiency in two parallel work streams. The first will look to increase the EDU efficiency through targeted use of composite materials. For example, if the NVH dampening properties of composites can be harnessed, the EDU will be more tolerant to NVH inputs for the motor and transmission. With NVH and efficiency often being in competition with each other, this increased NVH tolerance would provide design engineers with greater freedom to increase efficiency. The second work stream utilises composite sleeves to enclose a rotor in a way that is scalable for high volume manufacture, enabling higher power density eMotors, which in turn helps to reduce unit mass and size.




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