Method for calibrating zero offset of encoder of permanent magnet synchronous motor driven by main shaft of weaving machine

The invention provides a zero offset calibration method for an encoder of a loom spindle driving permanent magnet synchronous motor, and relates to the technical field of permanent magnet synchronous motor control. The rotor position of the current motor is obtained through a high-frequency rotation pulse injection method, and after the current rotor position is obtained, a vector control algorithm can be carried out to enable the motor to rotate; in the rotating process of the motor, when the motor passes through the zero position of the encoder, the zero position of the motor and the offset of the zero position of the encoder are obtained, and therefore the current position of a motor rotor can be calculated according to the feedback position of the encoder. After the weaving machine enters a high-speed operation state, the rotor position is estimated by adopting a motor rotor flux linkage observation algorithm in the high-speed rotation process of the motor, and the more accurate rotor position can be esti