基于SMVSC-MRAS直线电机无传感矢量控制研究

Research on Sensorless Vector Control of Linear Motor based on SMVSC-MRAS

针对永磁直线同步电机(Permanent Magnet Linear Synchronous Motor,PMLSM)通常对扰动以及负载阻力相对敏感、同时传感器容易受到外界环境影响导致测量不精确等问题,为了摆脱位置传感器对电机伺服系统的影响,本文构建了以改进型趋近律滑模控制器为核心,以模型参考自适应算法为观测器的PMLSM无传感器矢量控制系统。首先对传统PI控制器的不足进行了分析,设计了一种改进的滑模速度控制器,提出了模型参考自适应的观测方式,并搭建了永磁直线电机控制系统仿真模型。通过仿真对控制系统进行了验证,结果表明该方法控制下的追踪信号误差能控制在0.2mm内,系统运行平稳,具有较好的实用性。

In order to get rid of the influence of position sensor on motor servo system, a new sensorless vector control system based on improved sliding mode variable structure controller(SMVSC) and model reference adaptive algorithm is proposed for permanent magnet linear synchronous motor(PMLSM). Firstly, the shortcomings of traditional PI controller are analyzed, and an improved sliding mode speed controller is designed. On this basis, the observation mode of MRAS is proposed, and a sensorless position loop sliding mode control system is built. Through the simulation, the following ability and noise suppression ability of the control system are verified. The results show that the designed system can accurately realize the speed observation of linear motor, the system runs smoothly, and has good practicability.