Feedback Gain Design of Adaptive Luenberger Observer on PMSM Sensorless Control

Abstract

The sensorless control technology for permanent magnet synchronous motor is now one of the research hotspots of many scholars at home and abroad. The key to the sensorless control technology using field-oriented controll method is the acquisition of motor speed and rotor position. As a common method of speed estimation, Luenberger observer has the advantages of fast response speed, high estimation accuracy and good stability. However, the selection of feedback gain will affect the speed estimation effect to a large extent. For the problem that how to quickly and effectively select the feedback gain in sensorless control of PMSM based on Luenberger observer, a fourth-order adaptive observer that changes the feedback gain according to the motor speed by analyzing the mathematical model of PMSM in two phase static frame and using the idea of pole placement was proposed. Simulation and experimental results show that the feedback gain selection method is reasonable and effective, the designed adaptive Luenberger observer has good estimation accuracy, fast dynamic response and strong versatility for motors with different parameters, and greatly simplifies parameter tuning process.