Teardown Analysis and Fea Motor Model of Chevrolet Bolt Ev Drivetrain

Electric vehicles (EVs) are increasingly seen as a key element in the future of transportation. Consequently, substantial research efforts are focused on improving EV powertrain efficiency, reducing noise, vibration, and harshness (NVH), lowering costs, and minimizing size. A primary area of focus within powertrain research is the electric traction machine, a critical component driving EV performance. Benchmarking data is essential for advancing research and technology in this field. However, publicly available data on traction machines remains limited, posing a challenge for researchers. To address this gap, a comprehensive teardown study was conducted on the drive unit of the 2017 Chevrolet Bolt, including the 150 kW traction machine and gearbox. Each component was meticulously measured for size and weight, with the findings presented in this paper. An electromagnetic Finite Element Analysis (FEA) model was developed using measured rotor, stator, and magnet geometries to validate motor performance compared to published data. Simulation results showed discrepancies of less than 1.6 % for torque and 3% for torque ripple. Additional detailed teardown data from this study is made available online to support ongoing EV powertrain research.