IC600PM542RR，IC600PM542RRIC600PM542RR
感應(yīng)式雙速異步電動機變速控制電路
由電動機的原理可知，感應(yīng)式異步電動機的轉(zhuǎn)速表達式為：
（ 2-4 ）
由此可知電動機的轉(zhuǎn)速與電源頻率 f 、轉(zhuǎn)差率 s 及定子繞組的磁極對數(shù) p 有關(guān)，改變異步電動機的轉(zhuǎn)速可通過三種方法來實現(xiàn)：一是改變電源頻率 f ；二是改變轉(zhuǎn)差率 s ；三是改變磁極對數(shù) p 。本節(jié)主要介紹通過改變磁極對數(shù) p 的方法來實現(xiàn)電動機變極調(diào)速的基本控制線路。
１．變極式電動機的接線方式
變極式電動機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，將 U1 、 V1 、 W1 端接電源， U2 、 V2 、 W2 端懸空。連接成 YY 形時，將 U1 、 V1、 W1 端接成 Y 點，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，將 U1 、 V1 、 W1 端接電源， U2 、 V2 、 W2 端懸空。連接成 YY 形時，將 U1 、 V1、 W1 端和中性點 O 連接在一起，將 U2 、 V2 、 W2 端接電源。
２．感應(yīng)式雙速異步電動機按鈕控制的調(diào)速
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