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矢量操控原理- -简介
矢量操控办法其实就是将沟通电机的定子电流矢量分化为发生磁场的电流重量和发生转矩的电流重量,分别对其加以操控,并一同操控两重量间的幅值和相位,咱们将经过这种办法来操控沟通电机转矩的办法称为矢量操控办法,将分化发生的发生磁场的电流重量称为励磁电流,将分化发生的发生转矩的电流重量称为转矩电流。
二、矢量操控原理
下面咱们叙说矢量操控变频调速的详细进程:
1)将沟通电机等效为直流电机:将沟通电机的三相定子电流ia、ib、ic经过三相-二相变换变换为间断坐标系下的沟通电流ia1、ib1;
2)对速度、磁场两个重量进行独立操控:将间断坐标系下的沟通电流ia1、ib1经过磁场定向旋转变换变换为旋转坐标系下的直流电流im1、it1,其间,im1即等效为直流电动机的励磁电流,it1即等效为与转矩成正比的电枢电流;
3)对直流电机进行变频调速操控:依据直流电动机的操控办法求得直流电动机的操控量;
4)坐标反变换还原为对沟通电机的操控:依据上述一二进程的坐标变换进行相应的坐标反变换,将直流电流变换为沟通电流,再变换为三相定子电流以完成对沟通电动机的矢量操控。
三、矢量操控原理- -运用
矢量操控理论实际上就是将磁链与转矩解耦,分别规划两者的调节器以完成对沟通电机的高功用调速;将沟通电机等效为直流电机来进行矢量操控,还可以获得与直流电机调速体系相同的功用。因此现在矢量操控算法已广泛运用于siemens,ABB,Allen-Bradley,GE,Fuji,SAJ等国际化大公司的变频器上了。
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