This technology adopts a modular design that integrates motors, traction inverter, and axle drive mechanisms to reduce the power system's volume and weight and improve its power density. It applies to commercial vehicles of less than 3.5 tons. The technology adopts an axial end surface integration mechanism with an integrated water-cooling system and an embedded three-phase electrical power connection. The SiC power module is applied for the traction inverter to significantly improve system performance with a system power density over 4.0 kW/L.