Research On Sliding Mode Active Disturbance Rejection Control For PMSM Based On Speed Sensorless Control

Permanent magnet synchronous motor(PMSM)has the advantages of small external volume,simple internal structure,high efficiency and high power density,so more and more attention is paid by experts at home and abroad,and it has been widely used.However,due to the poor adaptability of the classical double closed loop PI controller to the time-varying parameters of the motor,the control performance will decrease when the motor is affected by the external environment and the parameters change.The speed measuring devices of PMSM are usually mechanical encoders,but this device is very demanding on the installation environment and has a high structure cost.Therefore,it is necessary to study the controller of PMSM and the speed sensorless.This article has carried out the following related content research:Firstly,a novel sliding mode ADRC structure is proposed,and a speed sensorless PMSM sliding mode ADRC system is constructed.On the basis of traditional self disturbance rejection control,the nonlinear disturbance observer(NDOB)is used to replace the comprehensive disturbance estimation term of the extended state observer(ESO).The sliding mode control is introduced to the nonlinear state error feedback control law.A new sliding mode self anti disturbance speed controller and the current controller are designed,and the Lyapunov theory is used to prove the stability.In order to solve the chattering problem of the new sliding mode controller,the fuzzy control is used to effectively estimate the sliding mode gain of the sliding mode when the sliding mode reaches the condition,and the chattering of the system is suppressed.As a whole,the problem of parameter setting and response speed is solved in traditional ADRC.The state observer of the current controller is calculated to obtain the rotor position and speed estimation value of the motor.The simulation results show the effectiveness of the method.Then,in order to solve the problem of the phase delay of the traditional sliding mode observer,the speed sensor designed in this paper is a novel cascaded sliding mode self disturbance rejection observer.An extended state observer(ESO)is replaced by the extended nonlinear disturbance observer(ENDOB)to form a new extended state observer(NESO),to form a new extended state observer(NESO),to get the back EMF,and to obtain the speed and position information of the backward EMF sliding mode observer.Thus,a sliding mode auto disturbance rejection control system of PMSM isestablished,which improves the disturbance rejection and response speed of the system.The simulation results verify the effectiveness of the method.Finally,through the various parts of the hardware circuit,the PMSM vector control experiment platform is completed,and the software program is written to realize the experimental verification of the PMSM speed regulation system.