Motor winding broken line detection method and detection device

The invention discloses a motor winding broken line detection method and a detection device. The motor winding broken line detection method is characterized in that S1. reference current of a current PWM period can be calculated; S2. reference duration time and actual duration time can be respectively calculated, when an absolute value of a K phase current of the current PWM period is smaller than the reference current, and in addition, the K is one of the A, the B, and the C; S3. whether the difference value between the reference duration time and the actual duration time is in the preset range can be determined; S4. the determination times can be recorded, when the difference value is not in the preset range, and thereafter the step 1, the step 2, and the step 3 can be repeated, and then whether the difference value delta T between the reference duration time and the actual duration time of the next PWM period is in the preset range can be determined, and at last the motor winding broken line can be determi