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The propulsion architecture of heavy duty electric trucks is shifting toward integrated solutions, with dual motor electric drive axles increasingly replacing conventional central direct drive systems.
Originally derived from internal combustion vehicle layouts, central direct drive systems retain the gearbox and driveshaft while replacing the engine with an electric motor. This configuration introduces mechanical losses due to extended transmission paths and can result in power interruption during gear shifts, particularly under high load conditions.
Dual motor integrated electric drive axles address these limitations by integrating motors, reduction gears, and control systems directly within the axle. This eliminates the need for a driveshaft and reduces transmission losses, improving overall drivetrain efficiency.
The architecture also enables more efficient chassis packaging. By freeing underfloor space, manufacturers can integrate higher capacity battery systems while lowering the vehicle’s center of gravity, contributing to improved stability. Weight reductions of up to 500 kg have been reported compared to traditional layouts, supporting increased payload capacity.
A key functional advantage is continuous torque delivery. In dual motor configurations, one motor can maintain torque output while the second manages gear shifting, avoiding power interruption during acceleration and grade climbing. This supports smoother operation and improved energy efficiency in heavy duty applications.
As electrification advances in commercial vehicles, integrated e-axle systems are being adopted across new heavy duty platforms, reflecting a broader transition toward higher efficiency, compact drivetrain architectures, and improved vehicle performance.
