Anti-Load Disturbance Permanent Magnet Synchronous Motor No Position Sensor Control System

A permanent magnet synchronous motor is a high-efficiency motor with high torque density,efficiency,and fast response.However,the traditional control method requires sensors to detect rotor position and speed,which can be costly,unreliable,and easily affected by external factors.Compared with the sensorless control method,the sensorless control method has the advantages of low cost,high reliability,and strong anti-interference.In sensorless control methods,the traditional sliding mode observer uses a switching function and low-pass filter to produce obvious rotational speed buffeting and phase delay,leading to technical problems such as phase lag.Therefore,this paper mainly studies sensorless control based on improved sliding mode observer,focusing on the following research:Firstly,the chattering and phase lag of rotor position Angle caused by traditional sliding mode observer in the process of speed estimation is discussed.This paper proposes an improved sliding mode observation control method that incorporates stator resistance identification,a sinusoidal saturation function,synchronous rotation filter,and phase-locked loop.This control method can significantly reduce chattering and increase convergence speed.By filtering out the harmonic component of the back electromotive force and reducing the phase lag angle,the proposed method solves the phase lag problem of the rotor and filters out high-frequency noise.MATLAB simulation and analysis validate the correctness and feasibility of the improved sliding mode observation control method based on stator resistance identification.Secondly,it aims at the unstable operation problem in that the speed rises and falls abruptly when the load changes during the motor operation.In this paper,a fuzzy PI-based anti-load disturbance control method is proposed.The method uses a fuzzy algorithm to modify the control parameters,observes the motor load disturbance in real time,converts the estimated load torque into current compensation,and feeds back to the speed controller,to ensure the internal stability of the motor.This control method shows remarkable advantages,which can significantly shorten the adjustment time of the system,reduce the phenomenon of speed drop and rise,suppress system chattering,and reduce the error of estimated speed and rotor position on the whole.Through MATLAB simulation and analysis,the correctness and feasibility of the anti-load disturbance control method based on fuzzy PI are verified.Finally,an experimental platform for motor control was constructed to validate the research on anti-load disturbance improved sliding mode control for permanent magnet synchronous motor.The improved sliding mode observation and control method based on stator resistance identification can solve the problems of speed buffeting and phase hysteresis during motor operation.The fuzzy PI-based anti-load disturbance control method effectively addresses the issue of unstable operation caused by speed fluctuations during motor operation due to load changes.The improved sliding mode control method for permanent magnet synchronous motors against load disturbance improves system stability and anti-interference capability,making it highly practical and widely applicable in motor control systems.