基于DSP异步电机无速度传感器直接转矩控制

基于模型参考自适应系统原理(Model Reference Self-Adapt System,简称MRAS)设计了一种新型的速度磁链自适应观测器,它以定子电流和定子磁链为状态变量,把磁链观测和速度辨识结合在一起,可以将定子磁链观测值直接应用于直接转矩控制算法中.定义了李亚普诺夫函数,根据其稳定性理论确定了速度自适应律.以TMS320F2812为核心构成控制器,实现异步电机无速度传感器直接转矩控制系统.实验结果证明,该系统具有较好的定子磁链和转速观测精度,能改善低速时磁链畸变程度和运行特性.

Speed Sensor-less Direct Torque Control of Asynchronous Motor based on DSP

This paper designs a new speed-adaptive flux observer which based on model reference self-adapt control system theory.The observer uses the stator current and the stator flux as state variable,the observation of flux and the estimation of speed are proceeding at the meantime.The observed flux could be applied to direct torque control system.The speed adaptive scheme of speed estimation is obtain utilizing Lyapunov's stability theory.Based on controller's core TMS320F2812,the speed sensor-less direct torque control emulation system has been designed.The experimental results prove that the control system has preferably observing precision of stator flux and speed of motor,it can reduce the degree of flux aberration and the operation characteristic in the low gear.