Research on Improved Speed Identification Technology Based on MRAS

Abstract

Abstract In order to accurately realize the asynchronous motor speed recognition, an improved speed recognition method based on MRAS is proposed, the motor body is used as the reference model and the stator current is used as the adjustable model. Based on MRAS, Considering the problems such as the poor output torque pulsation and high current harmonic content due to the influence of pure integral link, the low-pass filter plus compensation link is used to replace the pure integrator, the full range of stability is introduced on the basis of popov super-stability, and a new method of dead zone compensation is proposed. Finally, finally, in the simulation and experiment, the whole asynchronous motor speed sensorless MRAS is tested. Through the observation and comparison of the actual rotor speed and estimated speed curve, and the analysis of the speed error curve, the system can be accurately estimating the rotor speed and have a good static performance.