SDS4141變頻器貨真價(jià)實(shí)
矢量控制技術(shù)通過(guò)坐標(biāo)變換，將三相系統(tǒng)等效變換為M－T兩相系統(tǒng)，將交流電機(jī)定子電流矢量分解成兩個(gè)直流分量（即磁通分量和轉(zhuǎn)矩分量），從而達(dá)到分別控制交流電動(dòng)機(jī)的磁通和轉(zhuǎn)矩的目的，因而可獲得與直流調(diào)速系統(tǒng)同樣好的控制效果。
矢量控制系統(tǒng)采用雙閉環(huán)控制系統(tǒng)，圖1是其矢量控制系統(tǒng)框圖。
本系統(tǒng)中由測(cè)量所得的電機(jī)轉(zhuǎn)速，通過(guò)矢量運(yùn)算器產(chǎn)生磁場(chǎng)定向定子電流分量給定值和滑差角頻度給定值和測(cè)量所得的電機(jī)轉(zhuǎn)速經(jīng)過(guò)積分運(yùn)算可得轉(zhuǎn)子磁通位置角θ，并送至旋轉(zhuǎn)變換環(huán)節(jié)。由測(cè)得的電流經(jīng)矢量變換得到轉(zhuǎn)矩電流分量iM和勵(lì)磁電流分量iT，利用
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