IC600PM507RR，IC600PM507RRIC600PM507RR
感應式雙速異步電動機變速控制電路
由電動機的原理可知，感應式異步電動機的轉速表達式為：
（ 2-4 ）
由此可知電動機的轉速與電源頻率 f 、轉差率 s 及定子繞組的磁極對數 p 有關，改變異步電動機的轉速可通過三種方法來實現：一是改變電源頻率 f ；二是改變轉差率 s ；三是改變磁極對數 p 。本節主要介紹通過改變磁極對數 p 的方法來實現電動機變極調速的基本控制線路。
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，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．感應式雙速異步電動機按鈕控制的調速
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