无刷直流力矩电动机双闭环控制策略仿真分析

针对直接驱动阀(DDV,Direct Drive Valve)伺服系统存在负载扰动和经典的"三环"结构不能满足DDV伺服系统快速性要求的问题,采用双闭环控制系统.对位置环+速度环和位置环+电流环两种双闭环系统进行比较,在频域内设计和优化调节器的控制参数.仿真结果表明:双闭环系统均具有较好的稳定性和动态跟踪品质,能有效地克服负载扰动的影响.在系统阻尼系数很小的情况下,位置环+速度环系统的负载适应性更好,位置环+电流环系统快速性更好,与理论分析结果符合. 

Simulation and analysis of brushless DC motor double closed-loop control strategy

Load disturbance exists in direct drive valve(DDV) servo system. Meanwhile conventional triplex closed-loop control structure cannot satisfy DDV servo system in rapidity. Therefore double closed-loop control structure was adopted. Position and velocity double closed-loop system was compared with position and current double closed-loop system. The optimal proportion integral coefficients could be obtained through the method of frequency domain analysis. The simulation results show that double closed-loop control systems perform well in static and dynamic operation. Meanwhile the influence of load disturbance can be reduced effectively. When the system has a small damping coefficient, position and velocity double closed-loop system performs better in load adaptability. Position and current double closed-loop system performs better in rapidity. The comparison between the simulation results and theoretical analysis shows a good agreement.