IC610MDL104RR,IC610MDL104RR,IC610MDL104RR
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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