基于矢量控制的异步电机转速和转矩调节技术

针对异步电动机系统的非线性,以及电流和转矩不成正比例,使得转矩瞬时调节困难的问题,提出了一种基于坐标变换磁场定向矢量控制理论,将异步电机定子电流解耦成励磁电流和转矩电流分别进行控制,使异步电机获得和直流电机一样的转矩、转速调节特性.建立了Simulink仿真模型,分析了异步电机在空载启动、稳定运行、变速和转矩加载情况下...

Regulation technology of asynchronous machine torque and speed based on vector control

Aiming at the problem that it has the nonlinearity of the structure and misproportion of the asynchronons machine between current and torque,and accurately control of the torque is difficulty to realize,a theory based on coordinate transformation and field oriented vector control was presented.The asynchronous machine stator current was decomposed into exciting current and torque current.And by regulating exciting current or torque current separately,the control of torque and speed of asynchronous machine was made as simply as the DC machine.A Simulink model was established.And regulation characteristics of torque and speed were analyzed when asynchronous machine running at ＂no load start＂,＂ steady-state operation＂,＂variable speed＂ and ＂variable torque＂ status.The simulation results indicate that,by decomposing stator current into two independent parts with the field oriented vector control technology,both of the torque and speed get pleasant static and dynamic performance.