Zero position correction method for permanent magnet alternating current servo motor incremental encoder

Abstract

The invention discloses a method for correcting zero position of an incremental encoder of a motor by directly utilizing a servo driver, and in particular relates to a zero position correction method for a permanent magnet alternating current servo motor incremental encoder, which does not require any extra equipment and is easy to operate, high in precision, time-saving and high in practicality. The servo driver receives a position pulse signal transmitted by the incremental encoder, once the servo driver captures a Z pulse signal transmitted by the incremental encoder, the servo driver immediately performs zero clearing on the position pulse counting of the incremental encoder and recounts in an ABZ counting mode, and the motor operates in a closed loop control mode; a closed loop control motor of the servo driver is stopped, and the motor rotor is locked in the U-phase center, and the relative positions of the rotating shaft of the incremental encoder and the rotating shaft of the motor rotor are adjusted, so that the position pulse counting value of the incremental encoder is any one integer value in a closed interval [-10,10], and the rotating shaft of the incremental encoder and the rotating shaft of the motor rotor are fixed.

Description

technical field [0001] The invention relates to the technical field of servo motors, in particular to a method for correcting the zero position of an incremental encoder of a permanent magnet AC servo motor. Background technique [0002] The servo system is essentially a complex system coupled with electromagnetic fields. For industrial control and convenient application, after ignoring some secondary factors, the complex coupled electromagnetic field can be decoupled by appropriate methods, thereby simplifying analysis and calculation, and can achieve practicality. Field-oriented control (FOC) is commonly used in servo control, and the rotor magnetic field is oriented, and then through SVPWM modulation, the servo system can achieve um (micron) level precision, which can meet general industrial control requirements. [0003] In order to make the AC motor achieve the simple speed-torque characteristics similar to the DC motor (the torque of the DC motor has a simple linear r...

AI Technical Summary

Problems solved by technology

[0011] Defect: Since the V phase and the W phase are connected in parallel, the difference in the resistance values ​​of the two phase windings will cause the current imbalance in the two phase windings, resulting in the U phase not being completely aligned with the d axis, thus affecting the accuracy of zero calibration

[0020] The disadvantage of method three is that, like methods one and two, an additional DC power supply is required, and lead wires are required to energize the motor windings during operation.