Application Of Sliding Mode Control Method In Speed Regulation Of Permanent Magnet Synchronous Motor

In recent years,permanent magnet synchronous motor(PMSM)has been widely used in the field of intelligent manufacturing,especially in the fields of industrial robots,numerical control equipment,aerospace and military products.It has obvious advantages in volume,structure and efficiency.Advantages Conventional permanent magnet synchronous motors generally use PI controllers to control their speed loops and current loops.This nonlinear controller treats them as a time-varying system,and the controller itself is very sensitive to system parameter changes.Therefore,this kind of control method is difficult to guarantee a high progress and cannot be accurately adjusted.Sliding mode control(SMC)solves the above problems better because of its robustness and response speed.In view of this,the application of sliding mode control in permanent magnet synchronous motor is discussed in depth.This paper first introduces the basic structure principle and coordinate transformation algorithm of low-voltage permanent magnet synchronous motor,describes the main steps of space vector control algorithm,and analyzes the control effect of different algorithms in no-load and two cases.The simulation analysis verifies the advantages of sliding mode control.Based on the vector control of permanent magnet synchronous motor,the basic theoretical analysis of traditional sliding mode control method is analyzed and verified by simulation.On this basis,the paper also optimizes it,and gives the corresponding schemes.The simulation waveform analysis is used to verify the feasibility of these schemes.Among them,the optimization involves the following aspects: First,the gain Determined;the second is the switching function;the third is the filter gain coefficient;the fourth is the partial PLL parameters.The dynamic and steady-state performance of the observer is improved theoretically by optimizing the parameters to obtain the final comprehensive optimization results.At the same time,the rationality of the algorithm is verified by optimization simulation analysis,which provides theoretical conditions for establishing the experimental platform of the motor.Secondly,the terminal dynamic sliding mode controller studied in this paper has global non-singular dynamic characteristics,especially overcomes the weak point of the traditional sliding mode controller,and improves the convergence speed in the system,so that the system can resist better.External interference.Finally,the DSP processor model selected in the paper is TMS320F2812.The whole hardware platform mainly includes power supply and drive circuit,sampling circuit and IPM,signal conditioning circuit,etc.The source program is designed by CCS3.1 development environment.The source program file mainly involves current.With the control program such as speed,coordinate transformation and SVPWM,the terminal sliding mode controller designed in the paper is used to carry out experiments on the experimental platform.The analysis results show that the design has strong feasibility and correctness.