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1、電動機(jī)控制電路電動機(jī)的聯(lián)接三相電動機(jī)有三個定子繞組,分別用U、V、W表示,每個繞組有兩端,所以一共有六個接線端電動機(jī)的聯(lián)接有兩種方式,一種為星型聯(lián)接,另一種為三角型聯(lián)接星型接法三角型接法電動機(jī)的聯(lián)接星型接法三角型接法U1V1W2U2W1V2U1V1W2U2W1V2L1L2L3L1L2L3L1L3L2L1L2L3直接控制原理合上QS,電動機(jī)啟動。啟動FU3~MQS優(yōu)點(diǎn):設(shè)備簡單,安裝容易缺點(diǎn):只適用于小功率不頻繁啟動保護(hù):短路保護(hù)、漏電保護(hù)EL1L2L3UVWU11V11W11線碼:同一導(dǎo)線線碼相同經(jīng)過用電器線碼改變QSKM1KM2SB1SB2KHU11V11W11U1
2、1V11W11L1L2L3UVWSB3KMKH..SB控制電路KH3~MKMEQSFU1FU2主電路L1L2L3點(diǎn)動控制原理按下按鈕SB,KM線圈得電KM主觸點(diǎn)閉合,電動機(jī)啟動。得電啟動KMKH..SB控制電路KH3~MKMEQSFU1FU2主電路L1L2L3點(diǎn)動控制原理松開按鈕SB,KM線圈斷電KM主觸點(diǎn)斷開,電動機(jī)停轉(zhuǎn)。失電停止點(diǎn)動控制原理KMKH..SBKH3~MKMEQSFU1FU2L1L2L3線碼UVWU11V11W11U12V12W12U13V13W130123QSKM1KM2SB1SB2KHU11V11W11V12U12W12U11V11W11U12V1
3、2U13V13W13U12V12W12U13V13W13L1L2L3UVW11SB3330022連續(xù)控制原理KMKH..SB2KH3~MKMEQSFU1FU2L1L2L3KM啟動得電SB1合上開關(guān)QS按下起動按鈕SB2,KM線圈得電,KM主觸點(diǎn)閉合,電動機(jī)運(yùn)轉(zhuǎn)。KM輔助觸點(diǎn)閉合自鎖。松開起動按鈕SB2連續(xù)控制原理KMKH..SB2KH3~MKMEQSFU1FU2L1L2L3KM停止失電SB1按下停止按鈕SB1,KM線圈失電,KM主觸點(diǎn)斷開,電動機(jī)停止。KM輔助觸點(diǎn)斷開,解自鎖。連續(xù)控制原理KMKH..SB2KH3~MKMEQSFU1FU2L1L2L3KMSB1電路保護(hù)
4、短路保護(hù)熔斷器熱繼電器過載保護(hù)接地漏電保護(hù)接觸器失壓保護(hù)連續(xù)控制原理KMKH..SB2KH3~MKMEQSFU1FU2L1L2L3KMSB1線碼UVWU11V11W11U12V12W12U13V13W1301234..QSKM1KM2SB1SB2KHU11V11W11V12U12W12U11V11W11U12V12U13V13W13U12V12W12U13V13W13L1L2L3UVW11SB32233344400電動機(jī)正反轉(zhuǎn)的控制線路將電動機(jī)接到電源的任意兩根線對調(diào)一下,即可使電動機(jī)反轉(zhuǎn)。需要用兩個接觸器來實(shí)現(xiàn)這一要求。當(dāng)正轉(zhuǎn)接觸器工作時,電動機(jī)正轉(zhuǎn);當(dāng)反轉(zhuǎn)接觸器工
5、作時,將電動機(jī)接到電源的任意兩根聯(lián)線對調(diào)一下,電動機(jī)反轉(zhuǎn)。演示連續(xù)正反轉(zhuǎn)控制原理L1L2L3KH..SB2KH3~MKM1EQSFU1FU2KM1SB1.....SB3KM2KM1KM2KM2......KM1KM2連續(xù)正反轉(zhuǎn)控制原理L1L2L3SB2和SB3決不允許同時按下,否則造成電源兩相短路。正轉(zhuǎn)按鈕反轉(zhuǎn)按鈕反轉(zhuǎn)接觸器正轉(zhuǎn)接觸器反轉(zhuǎn)觸點(diǎn)正轉(zhuǎn)觸點(diǎn)KH..SB2KH3~MKM1EQSFU1FU2KM1SB1.....SB3KM2KM1KM2KM2......KM1KM2連續(xù)正反轉(zhuǎn)控制原理L1L2L3.FU1..KH3~MKM1EQS....KM2FU2KHSB2KM
6、1SB1SB3KM2KM1KM2......連續(xù)正反轉(zhuǎn)控制原理L1L2L3.FU1FU2.KH.SB2KH3~MKM1EQSKM1SB1....SB3KM2KM1KM2KM2......合上QS,按下正轉(zhuǎn)啟動按鈕SB2,常閉觸點(diǎn)斷開,互鎖;常開觸點(diǎn)閉合,KM1線圈得電,KM1主觸點(diǎn)閉合,電動機(jī)正轉(zhuǎn),KM1常開輔助觸點(diǎn)閉合,自鎖連續(xù)正反轉(zhuǎn)控制原理L1L2L3.FU1FU2.KH.SB2KH3~MKM1EQSKM1SB1....SB3KM2KM1KM2KM2......合上QS,按下反轉(zhuǎn)啟動按鈕SB2,常閉觸點(diǎn)斷開,互鎖;常開觸點(diǎn)閉合,KM2線圈得電,KM2主觸點(diǎn)閉合,電
7、動機(jī)正轉(zhuǎn),KM2常開輔助觸點(diǎn)閉合,自鎖連續(xù)正反轉(zhuǎn)控制原理FU2KHSB2KM1SB1SB3KM2KM1KM2......合上QS,按下正轉(zhuǎn)啟動按鈕SB2,反轉(zhuǎn)停止,正轉(zhuǎn)啟動。先斷開失電閉合得電斷開閉合連續(xù)正反轉(zhuǎn)控制原理L1L2L3.FU1FU2.KH.SB2KH3~MKM1EQSKM1SB1....SB3KM2KM1KM2KM2......U11V11W11V12U12W12U13V13W13UVW01234567線碼QSKM1KM2SB1SB2KHU11V11W11V12U12W12U11V11W11U12V12U13V13W13U12V12W12