Field weakening curve tracking method and device for built-in permanent magnet synchronous motor based on self-learning

Abstract

The invention provides an autonomous learning-based maximum torque-current ratio curve tracking method for an interior permanent magnet synchronous motor. The method comprises an angle calculation module, a voltage comparator, an autonomous learning derivative observer, a PI regulator and a current comparator, wherein angle calculation is obtaining a new angle value according to the addition of angle compensation output from the PI regulator and a current angle; the voltage comparator judges whether a voltage limit is reached or not through comparing a current terminal voltage amplitude with busbar voltage; the autonomous learning derivative observer calculates a partial derivative of torque on the angle through a perturbation and observation method; the partial derivative is output to thePI regulator; the PI regulator calculates the required angle compensation quantity; and when a derivative of error torque on the angle is within a preset range, completion of tracking is judged and the magnitude of a current vector is immediately updated. The development efficiency can be improved from a static calibration mode to a dynamic search mode, the curve correctness is ensured and the autonomous learning-based maximum torque-current ratio curve tracking method has better applicability to different motors.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motor control, in particular to a method and device for tracking a field weakening curve of a built-in permanent magnet synchronous motor based on self-learning. Background technique [0002] With the development of the national economy and science and technology, motors play an increasingly important role in all walks of life. Due to its many advantages in design, manufacture and control, permanent magnet synchronous motors are widely used in various industrial production and life occasions. In addition, my country is rich in rare earth resources, and the application market of permanent magnet synchronous motors is particularly large in my country. Permanent magnet synchronous motors can be divided into surface mount type and built-in type according to the similarities and differences of AC-D axis inductance. Because the built-in permanent magnet synchronous motor (IPMSM) ca...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to improve the defects such as long construction period, low efficiency, poor accuracy and poor robustness existing in the existing manual calibration method of field weakening curve, and to provide a built-in permanent magnet synchronous motor field weakening curve tracking algorithm based on self-learning and supporting

Images