Study On Position Accuracy Of PMSLM Based On The Sliding Model Variable Structure Control And Error-compensation Technology

In the field of ultra-precision straight linear motion,the PMSLM has the advantages ofquick response, high speed and high acceleration, small inertia. It have wide applicationforeground in many fields such as ultra-precision feed system. This paper takes PMLS as thecore. Setting up the experiment platform for the positioning accuracy of PMLSM servosystem. To study the positioning accuracy from two aspects. On the one hand, to illustratefrom the improve sliding mode variable structure control; on the other hand to illustrate fromerror compensation. Doing the simulation to the application effect of control strategy. Tomake the experiment to verify the effect of error compensation.Firstly, models of the servo system of PMSLM are built. On the basis of the practicalapplication was studied widely and mature traditional control strategy-Vector Control.Analyzed all parts of the control. Setting up the system of current loop, velocity loop andposition loop and building the traditional simulation model of the servo system of PMSLMthrough MATLAB.Because PMLSM servo system has the characteristics that its factors is easily perturbedand it’s difficult to be modeled. The paper proposed a modern control strategy-sliding modevariable structure control, this kind of control strategy has the advantages that the timeneeded is stable whether from the initial position to the sliding mode surface for the systemor the point of sliding mode is in a stable state, and it can remove the effection of the controlsignal in high frequency oscillations in the condition of system being stable and having nosingular point, the influence of which resulted in that the system control accuracy andresponse speed is improved, and this paper did the design of the nonsingular Terminal slidingmode position controller on the base of sliding mode control theory. Based on this, weestablished the controlling simulation of speed and position of permanent magnetsynchronous linear motor by using MATLAB, compared to the traditional PID simulationresults,the simulation results based on the nonsingular Terminal sliding mode control strategy showed that the position control of the controller owns stronger anti-interferenceand robustness.Starting from engineering thinking, Proposed using the error compensation to furtherimprove the positioning accuracy of the servo system of PMSLM. First, analyzing thefactors affecting the positioning accuracy of system and put forward the improvement plan.On this basis, building the PMSLM position error compensation experiment platform. Highprecision grating ruler to measure. ABB MotiFlexe100drive is the core of the whole system.The control core is USB9030movement control card. Evaluation of position precision isinternational standard ISO-230-2. Making the table of error compensation according to thesystem position error data Through the error compensation function of motion control cardto complete target position error compensation. Finally, using MATLAB to handle beforeand after compensation in the positioning accuracy of the successively data of positioningaccuracy. knowing the error compensation technology have obvious effect of improve thepositioning accuracy.