Hitachi and Hitachi Astemo jointly announced the development of a direct-drive system for the EV segment which combines the motor, inverter, and brake into a single unit.
This will enable the installation of the entire system into the wheel. The new motor transmits the high drive force to run an EV directly to the wheels. Its design and 2.5 kW/kg power density limits the weight increase traditionally associated with in-wheel units. Moreover, adopting an in-wheel unit 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 by 30 percent and increases the range on a single charge.
In addition to the vehicle control technology it has been developing, Hitachi Astemo will apply the new direct-drive system to its already-extensive, global EV product lineup.