High Performance/Offroad Transmotor-Based Powertrain

This project goal is to improve the conventional electric vehicles peformance and graeability. In the proposed powertrain, the maximum torque can be available at a larger speed range. This feature leads to three notable improvements that enhance the powertrain performance and efficiency. First, higher gradability is achievable at any vehicle speed that enables maintaining the desired speed at a higher road grade. Furthermore, acceleration and deceleration (regenerative braking) are significantly improved, in comparison to the conventional powertrain, without increasing the powertrain electrical rating. Finally, the efficiency can be improved due to the effective kinetic energy recovery at higher speeds. Numerical simulations and emulation tests are presented to demonstrate the above improvements.

Transmotor-Flywheel-Based Powertrain Torque-Speed Characteristics

The transmotor-flywheel-based powertrain allows us to have access to the maximum torque at any electric motor, and subsequently vehicle’s speed. In the other words, it is possible to have access to the maximum torque at any feasible vehicle's speed. Furthermore, it is possible to reduce or eliminate the need for the field weakening approach at a higher angular velocity in the powertrain equipped with the transmotor. These features are possible because the transmotor’s shafts rotate in the same direction, and hence, the back-emf voltage can be limited at various angular velocities.