摘要:针对弹用电动舵机系统,建立表贴式永磁同步电机(SPMSM)矢量控制模型。设计了基于变指数趋近律的滑模变结构控制器,并在此基础上进行了抖振抑制。同时,在电流环设计了基于电压反馈、电流注入的弱磁电流分配策略,提高了舵机系统在轻负载情况下的动态响应速度。仿真结果表明,设计的控制器可以很好的提高舵机系统的控制精度与动态性能。其中,电机最高转速提高了258%,转矩脉动减小了915%,阶跃响应上升时间减小了50%。 关键词:永磁同步电机;电动舵机;滑模变结构;抖振抑制;弱磁分配
Abstract: Based on electric steering system for missile, a vector control model of the surface permanent magnet synchronous motor (SPMSM) was established. On this basis, a sliding mode variable structure controller based on variable index reaching law was designed, which had an inhibition of chattering. Meanwhile, in the current loop, a weak magnetic distribution strategy was designed based on voltage feedback to improve dynamic response speed of the servo system under the condition of light load. The simulation results show that the combined controller can well improve control precision and dynamic state performance of the system. Especially, the max speed f the motor increased by 258%, the torque ripple of the motor reduced by 915% and the rise time of step response cut down by 50%. Key words: permanent magnet synchronous motor; electric steering; sliding mode variable structure; chattering inhibitory; weak magnetic distribution |