High Power-Density in-Wheel Motor

Abstract

This paper presents a compact, lightweight direct-drive in-wheel system for electric vehicles (EVs), which combines the motor, inverter, and brake into a single unit. This enables the installation of the entire system into the wheel and more expansive interior and battery installation spaces. Proposed system transmits the high drive force directly to the wheels, and its lightweight design and high power density significantly limit the weight increase traditionally associated with in-wheel units. Moreover, the system does not require a substantial change to the existing configuration of the suspension and other components. Driveshafts and other indirect mechanisms have been eliminated, allowing motor power to be applied directly to EV operation. This reduces energy loss and increases the range on a single charge compared to existing EVs.