Double-three-phase motor driving system and control method of double-three-phase-motor

The invention relates to a double-three-phase motor driving system and a control method of a double-three-phase motor. The system comprises a motor controller, the double-three-phase motor and a position sensor. The motor controller is used for acquiring first position information of a motor rotor through acquisition by the position sensor, instruction voltage information and phase current of thedouble-three-phase motor, and calculates second position information of the motor rotor according to the instruction voltage information, the phase current and a mathematical model of the double-three-phase motor. When the time segment in which a difference between the first position information and the second position information exceeds a preset time segment appears, a fault of the position sensor is determined, and the second position information is used as the position information of the motor rotor. According to the system and the control method, the calculated second position informationis compared with the firs