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SVPWM控制,变频器输出相电压?

我知道变频器的输出电压是按照输出的基波电压来算的,但是我想问的是,应用SVPWM控制,母线电压513V, 不过调制,输出最大的相电压不是305V左右吗?那么如果是控制三相380V电机的话,怎么让它额定电压工作呢?谢谢