|Sketch of the Concept-CT MIEV
Mitsubishi Motors Corporation and Mitsubishi Motors North America Inc. (MMNA) will introduce a new series-hybrid 4WD sport compact concept car—the Concept-CT MIEV—at the 2006 North American International Auto Show (the Detroit Motor Show) in January.
The CT concept uses the Mitsubishi In-wheel motor Electric Vehicle (MIEV) technology (earlier post) shown earlier this year in a prototype Lancer MIEV. A gasoline engine will work as the genset with the lithium-ion battery pack to provide power for the in-wheel electric motors.
The new in-wheel motor uses a hollow doughnut construction that locates the rotor outside the stator as opposed to a common electric motor where the rotor turns inside the stator. Mitsubishi points to several benefits from this design for the motor:
Greater ease of raising power output and torque.
Higher torque allows the speed reducer unit to be eliminated, meaning less weight and improved power transmission efficiency.
Better space efficiency with the brake assembly fitting inside the motor which itself fits neatly within the wheel house.
The outer-rotor arrangement also surmounts the difficulties presented to date by the steering system, making it suitable for fitting to and driving the front wheels—and facilitating 4WD in-wheel motor vehicles.
As applied in the Lancer prototype, each motor, manufactured by Toyo Denki Seizo K.K., produces a maximum output of 50 kW with 518 Nm of torque.