富士FVR 1.5 AS1S-4C低壓變頻器
隨著低壓變頻器技術(shù)的不斷成熟,低壓變頻的應(yīng)用場合決定了它不同的分類。單從技術(shù)角度來看,低壓變頻器的控制方式也在一定程度上表明了它的技術(shù)流派。有幾種控制方式:其中之一正鉉脈寬調(diào)制(SPWM) 其特點是控制電路結(jié)構(gòu)簡單、成本較低,機械特性硬度也較好,能夠滿足一般傳動的平滑調(diào)速要求,已在產(chǎn)業(yè)的各個領(lǐng)域得到廣泛應(yīng)用。但是,這種控制方式在低頻時,由于輸出電壓較低,轉(zhuǎn)矩受定子電阻壓降的影響比較顯著,使輸出zui大轉(zhuǎn)矩減小。
富士FVR 1.5 AS1S-4C低壓變頻器
Low cost and good mechanical properties, it can meet the requirement of smooth speed adjustment of general drive, and has been widely used in various fields of industry. However, this control mode is lower in the low frequency, because the output voltage is low, the torque is significantly affected by the stator resistance pressure drop, so that the output maximum torque decreases.
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