Rotary transformer zero position self-learning method of permanent magnet synchronous motor

The invention discloses a rotary transformer zero position self-learning method for a permanent magnet synchronous motor, and the method comprises the steps: S1, enabling an IGBT switch tube to be turned on in different sequences, setting a duty ratio, learning a same rotary transformer initial value for multiple times from different directions, and enabling a two-phase bridge arm to be turned on in each rotary transformer orientation process, and reducing the loss of the IGBT switch tube; s2, judging whether the resolver difference values Resolver A1-Resolver A2 of the two times of learning are smaller than a threshold value Y or not; if the difference value of the two times of resolver learning is larger than the threshold value, the S1 is executed again, the difference value of the resolver learning is judged again, if the difference value of M times of continuous resolver learning is larger than the threshold value, the resolver learning fails, and otherwise, the resolver learning value is the calculated