Unsettled Technology Areas in Electric Propulsion
Systems EPR2021012
Electric vehicle (EV) transmission technology—crucial for battery electric
vehicles (BEVs) and hybrid electric vehicles (HEVs)—is developing quickly and
customers want good performance at a low cost. Single-speed gearboxes are
popular in electric drive systems due to their simple and cost-effective
configuration. However, multispeed gearboxes are being taken to market due to
their higher low-speed torque, dynamic performance, and energy efficiency.
Unsettled Technology Areas in Electric Propulsion Systems reviews
the economic drivers, existing techniques, and current challenges of EV
transmission technology—including torque interruption during shifting; thermal
and sealing issues; and noise, vibration, and harshness (NVH). This report
discusses the pros and cons for both single-speed and multispeed gearboxes with
numerical analysis.
