永磁直线同步电动机直接推力控制策略研究
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摘要
论文以直接推力控制策略在永磁直线同步电动机控制中的应用为主要研究内容。用场路结合的方法建立了永磁直线同步电动机非线性、不对称和变参数状态空间模型。用有限元法计算了磁阻力的端部分量,采用三角多项式对计算结果做最小平方逼近,得到了端部分量的解析模型。通过理论分析和系统仿真,论证了直接推力控制策略的可行性。深入分析了初级电阻变化对磁链观测精度的影响,设计了磁链动态补偿器,对其补偿原理进行了数学证明,仿真结果验证了其具有较强的鲁棒性,提高了磁链实际观测精度,减小了推力和速度波动。以数字信号处理器为核心开发了控制器,建立了高精度的实验测试系统,构建了永磁直线同步电动机直接推力控制实验平台,取得了大量的实验数据和良好的控制效果。
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.
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.
引文
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