ISSUE 012 Winter 2021 Sigma Powertrain EMAX transmission dossier l In conversation: David Hudson l 48 V systems focus l 2021 Battery Show North America and Cenex-LCV reports l Everrati Porsche 911 digest l Switching insight l Motor laminations focus

4 Intro Zero-emissions transport is becoming more widespread thanks to advances in a range of supporting technologies 6 The Grid 2 MW aircraft motor unveiled, new thermal management system for SiC inverters in heavy-duty vehicles, project to develop 800 V fast-charging EV system, and much more... 16 In conversation: David Hudson ePropelled’s head of EV strategy explains its dynamic torque switching technology 20 Dossier: Sigma Powertrain EMAX transmission By combining two motors with a modular gearbox, this system can drive any size and weight of EV. We recount the story of its development 32 Focus: 48 V systems The benefits to battery EVs of moving their power distribution networks to 48 V 42 Report: Battery Show North America 2021 Key battery-related takeaways from this major US exhibition 46 Report: Cenex-LCV 2021 EV technology highlights from this UK showcase of low-to-zero carbon mobility 50 Digest: Everrati Porsche 911 How this classic sportscar was given the ‘restoration- modification’ treatment to turn it into a roadworthy EV 56 Deep insight: Switching Inverters and onboard chargers are getting a performance boost from new switching technologies, as we explain 64 Focus: Motor laminations Lamination technology is advancing at pace to address the changing needs of the EVs industry. Here’s how 74 PS: Electric and hybrid aircraft Electric aviation is unlikely to evolve in the same way as the automotive sector has, so what are the key issues? 50 64 Winter 2021 | E-Mobility Engineering 3 Contents | Winter 2021