Research On Speed Of Permanent Magnet Synchronous Motor Based On Adaptive Robust Sliding Mode

Permanent Magnet Synchronous Motors(PMSMs)have permanent magnets for their internal rotors compared to DC motors,AC motors,and asynchronous motors.They have the advantages of simple structure,high operating efficiency,and maintenance-free operation.In recent years,it has been enthusiastically sought after by people.And it is widely used in elevators,robots,aerospace and other sophisticated fields.Because of its different motor structure,its control system is different from the conventional speed control.The rotor of the permanent magnet synchronous motor adopts a permanent magnet instead of the original field winding,although it has prominent features for reducing the volume of the motor and reducing the loss of energy.But it is the lack of excitation windings using permanent magnets,making it difficult to control the excitation winding flux,so the characteristics of permanent magnet synchronous motor control has a strong coupling,complex nonlinear characteristics.In the conventional speed control of permanent magnet synchronous motor,PI control is used as a speed controller,but when it comes to the nonlinear and complex time-varying system of permanent magnet synchronous motor,the control effect often fails to meet the actual process requirements.For the characteristics of speed in the speed control system,an adaptive sliding mode control is introduced as the motor speed control.In order to deal with the problem of load disturbance in the system,adaptive sliding mode control is improved and robust control is added to enhance the system’s resistance to external disturbances.The implementation of the motor drive system of the permanent magnet synchronous motor needs to obtain the rotor position and speed information,which is often obtained by the position sensor,but installing the corresponding sensor will increase the cost of the system and may reduce the reliability of the system.In the conventional method,a sliding mode observer is often used to observe the rotor position and speed.In this paper,the back-EMF filter based on the extended Kalman filter is used on the basis of the traditional sliding mode observer to reduce the impact of high-frequency information.At the same time,rotor position and velocity are estimated using the phase-locked loop technique in rotor position estimation.Information is estimated.According to the current development situation of permanent magnet synchronous motor control,and combined with specific engineering requirements,the mathematical model of permanent magnet synchronous motor is summarized,and the coordinate conversion problem that permanent magnet synchronous motor needs to use in subsequent control is introduced in detail.Then it is explained.The theoretical basis of the space-vector pulse-width modulation technique and the waveform generation mechanism and the principle of the sliding mode variable structure provide the theoretical basis for the follow-up control system.Finally,the simulation analysis shows that the permanent magnet synchronous motor has a faster response speed and stronger robustness.The rotor position estimation also has higher accuracy than the conventional method.It shows that the control system has excellent speed control capability and operational reliability,and can accurately detect position information.