Motor open-phase fault determination method and device, and vehicle

The invention discloses a motor open-phase fault determination method and device and a vehicle, and relates to the field of vehicles. In the operation process of the motor, after the phase current of each phase when the motor is located in a plurality of sectors is obtained by the open-phase detector, the number of phase currents with open-phase anomalies in the plurality of sectors is determined according to the phase current of each phase, and if the number is larger than a number threshold value, it is determined that an open-phase fault occurs in the motor. Whether the motor has the open-phase fault or not is detected in a software mode, no additional hardware circuit needs to be added, so that the hardware cost is reduced, and the reliability of detecting the open-phase fault of the motor is improved.