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6ES7 307-1BA00-0AA03)电流环根据电压外环输出的idref进行D轴电流控制,使Q轴电压Uq减小,实现Us的降低;
4)当电压外环输出的idref使Us降低到等于Usmax时,Usmax-Us=0,电压外环的PI输出不在变化,idref维持不变,电流环输出电压维持Usmax输出,实现对电流的控制;
5)当电机转速降低或者iqref减小时,电流环输出电压Us将小于Usmax,Usmax-Us>0,在电压外环PI作用下,idref将增大(负数—>0);使Q轴电压Uq增大,实现Us增大,将Us维持在Usmax附近,保证了控制系统电压利用率。
通过上面的5步分析,希望能帮助大家的理解电压外环弱磁的机制:利用电流环输出电压Us与输出电压Usmax的偏差,自动调节出D轴弱磁电流idref,使电流环的输出电压能维持在Usmax输出,保证系统电压利用率,使系统运行状态。
6ES7 307-1BA00-0AA0
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6ES7 307-1BA00-0AA0