Study On The Direct Thrust Force Control Strategy Of Permanent Magnet Linear Synchronous Motor

This paper focuses on the application of direct thrust force control strategy to PMLSM. A nonlinear, asymmetric, variable- element state-space model of PMLSM is built through the combination of field and path methods. The end component is calculated through finite element method, the result of which is done least square approximation to get the analysis model of the end component. Through theoretical analysis and system stimulation, the feasibility of direct thrust force control strategy is verified. The effect the change of the primary resistance has on the flux linkage observation accuracy is deeply analyzed and a dynamic flux linkage compensator is designed, whose working principles are also reasoned mathematically. The stimulation result shows that the compensator has strong robustness and improves the actual observation accuracy of flux linkage and weakens the fluctuation of thrust force and speed. A controller, with the digital signal processor as the core, is developed. An experimental testing system with high degree of accuracy is built to a direct thrust force control experiment platform of PMLSM, through which a large quantity of experiment data and excellent control effect are achieved.