Survey of anti-directional-twin-rotary motor drive characteristics for electric vehicles

A new power train for electrical vehicles is proposed, using anti-directional-twin-rotary motor (ADTR-motor). A stator in a conventional motor was reformed to be movable, and the stator (outer rotor) rotate in the antidirection of the inner rotor. In this paper several characteristics of an induction motor type ADTR-motor were reported. When the ADTR-motor is used for an electrical vehicle, the direction of one of the rotors should be reversed, and both rotors rotate in the same direction, and propel the two wheels of electrical vehicles. The torque of the wheels can be balanced without a differential gear. The fundamental torque balancing characteristics of ADTR-motor are clarified, which are the torque balance theory, the torque-speed characteristics, the rotor speed transient characteristics, the transient torque response under the speed sensor-less torque control, and the very low sensorless speed estimation.