Characterization Study of an Electric Motor-Transmission System For Electric Vehicles

摘要

A unique electric transmission concept, consisting of two DC traction motors in tandem, for use in automotive vehicles is described. The device does away with the requirement of intermittent current supply at low speeds, and is shown to be superior to conventional electric motor drives with regard to efficiency, flexibility of torque-speed requirements, control, and adapt¬ability to regenerative braking. The electric motor-transmission can operate in either the differential, single-motor, or additive mode, producing both forward and reverse speeds while covering the entire spectrum of torque, speed. and power required by an automotive vehicle. A detailed study of a 7.5 Kw model was performed, providing performance data, current drain, output, effi¬ciencies, and other relevant system characteristics. Based on this data, a preliminary design is formulated including estimates of size, weight, and cost.