IC610MDL112RR，IC610MDL112RRIC610MDL112RR
感應(yīng)式雙速異步電動(dòng)機(jī)變速控制電路
由電動(dòng)機(jī)的原理可知，感應(yīng)式異步電動(dòng)機(jī)的轉(zhuǎn)速表達(dá)式為：
（ 2-4 ）
由此可知電動(dòng)機(jī)的轉(zhuǎn)速與電源頻率 f 、轉(zhuǎn)差率 s 及定子繞組的磁極對(duì)數(shù) p 有關(guān)，改變異步電動(dòng)機(jī)的轉(zhuǎn)速可通過三種方法來實(shí)現(xiàn)：一是改變電源頻率 f ；二是改變轉(zhuǎn)差率 s ；三是改變磁極對(duì)數(shù) p 。本節(jié)主要介紹通過改變磁極對(duì)數(shù) p 的方法來實(shí)現(xiàn)電動(dòng)機(jī)變極調(diào)速的基本控制線路。
１．變極式電動(dòng)機(jī)的接線方式
變極式電動(dòng)機(jī)是通過改變半相繞組的電流方向來改變極數(shù)，圖 2-27 為常用兩種接線圖，即△ -YY 和 Y-YY 。
（ 1 ）△ -YY 連接
如圖 2.27 （ a ）所示，連接成△形時(shí)，將 U1 、 V1 、 W1 端接電源， U2 、 V2 、 W2 端懸空。連接成 YY 形時(shí)，將 U1 、 V1、 W1 端接成 Y 點(diǎn)，將 U2 、 V2 、 W2 端接電源。
（ 2 ） Y-YY 連接
如圖 2.27 （ b ）所示，連接成 Y 形時(shí)，將 U1 、 V1 、 W1 端接電源， U2 、 V2 、 W2 端懸空。連接成 YY 形時(shí)，將 U1 、 V1、 W1 端和中性點(diǎn) O 連接在一起，將 U2 、 V2 、 W2 端接電源。
２．感應(yīng)式雙速異步電動(dòng)機(jī)按鈕控制的調(diào)速
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