中級(jí)電工培訓(xùn)目錄低壓電氣的應(yīng)用P3三相籠型異步電動(dòng)機(jī)的啟動(dòng)控制電路P10三相籠型異步電動(dòng)機(jī)的制動(dòng)控制電路P70多速異步電動(dòng)機(jī)的控制電路P110繞線轉(zhuǎn)子異步電動(dòng)機(jī)的啟動(dòng)與調(diào)速控制電路P149第三章低壓電氣和電動(dòng)機(jī)控制電路的應(yīng)用

分為：1.低壓電氣的應(yīng)用2.三相籠型異步電動(dòng)機(jī)的啟動(dòng)控制電路3.三相籠型異步電動(dòng)機(jī)的制動(dòng)控制電路4.多速異步電動(dòng)機(jī)的控制電路5.繞線轉(zhuǎn)子異步電動(dòng)機(jī)的啟動(dòng)與調(diào)速控制電路第三章低壓電氣和電動(dòng)機(jī)控制電路的應(yīng)用

—繞線轉(zhuǎn)子異步電動(dòng)機(jī)的啟動(dòng)與調(diào)速控制電路YR系列符號(hào)

繞線轉(zhuǎn)子三相異步電動(dòng)機(jī)，可以通過滑環(huán)在轉(zhuǎn)子繞組中串接電阻來改善電動(dòng)機(jī)的機(jī)械特性，從而達(dá)到減小啟動(dòng)電流、增大啟動(dòng)轉(zhuǎn)矩以及調(diào)節(jié)轉(zhuǎn)速的目的。2023/2/44183一、轉(zhuǎn)子繞組串接電阻啟動(dòng)控制線路1.轉(zhuǎn)子串接三相電阻啟動(dòng)原理啟動(dòng)時(shí)，在轉(zhuǎn)子回路串入作Y形連接、分級(jí)切換的三相啟動(dòng)電阻器，以減小啟動(dòng)電流、增加啟動(dòng)轉(zhuǎn)矩。隨著電動(dòng)機(jī)轉(zhuǎn)速的升高，逐級(jí)減小可變電阻。啟動(dòng)完畢后，切除可變電阻器，轉(zhuǎn)子繞組被直接短接，電動(dòng)機(jī)便在額定狀態(tài)下運(yùn)行。轉(zhuǎn)子串接三相對(duì)稱電阻器轉(zhuǎn)子串接三相不對(duì)稱電阻器2023/2/451832.按鈕操作控制線路2023/2/46183L1L2L3FU1KM1M3～3FU2KHSB5QSSB1KM2KM3KMKM1KM3KM2KM1KM3KM2KMR1R2R3KHSB2SB3SB4電路組成分析KM2023/2/47183M3～L1L2L3KM13SB5SB1KM2KM3KMKM1KM3KM2KM1KMKM3KM2KMR1R2R3SB2SB3SB4按下SB2KM1線圈得電KM1觸頭閉合繞線轉(zhuǎn)子串聯(lián)R2,R3啟動(dòng)FU1FU2QSKHKH2023/2/48183M3～L1L2L3KM13SB5SB1KM2KM3KMKM1KM3KM2KM1KMKM3KM2KMR1R2R3SB2SB3SB4按下SB3KM2線圈得電KM2觸頭閉合繞線轉(zhuǎn)子串聯(lián)R3啟動(dòng)FU1FU2QSKHKH2023/2/49183M3～L1L2L3KM13SB5SB1KM2KM3KMKM1KM3KM2KM1KMKM3KM2KMR1R2R3SB2SB3SB4按下SB4KM3線圈得電KM3觸頭閉合繞線轉(zhuǎn)子切除全部電阻運(yùn)行FU1FU2QSKHKH2023/2/410183M3～L1L2L3KM13SB5SB1KM2KM3KMKM1KM3KM2KM1KMKM3KM2KMSB2SB3SB4松開SB4電動(dòng)機(jī)繼續(xù)運(yùn)行R1R2R3FU1FU2QSKHKH2023/2/4111833.時(shí)間繼電器自動(dòng)控制線路2023/2/412183L1L2L3FU1KM1M3～3FU2KHSB2QSSB1KM2KM3KMKMKT3KM3KM2KM1KM3KM2KM1KMR1KT1KT2KT3R2R3KMKM1KM2KM3KM3KT1KT2KH電路組成分析2023/2/413183L1L2L3M3～3SB2SB1KM3KMKMKT3KM2KM1KM3KM2KM1R1R2R3KMKM1KM2KM3KM3KT1KT2合上QS按下SB1KM線圈得電KM1KM2KM3KMKT1KT2KT3FU1FU2KHQSKH2023/2/414183L1L2L3M3～3SB2SB1KM3KMKMKT3KM2KM1KM3KM2KM1R1R2R3KMKM1KM2KM3KM3KT1KT2KM觸頭閉合繞線轉(zhuǎn)子串聯(lián)全部電阻啟動(dòng)KT1線圈得電KM1KM2KM3KMKT1KT2KT3FU1FU2KHQSKH2023/2/415183L1L2L3M3～3SB2SB1KM3KMKMKT3KM2KM1KM3KM2KM1R1R2R3KMKM1KM2KM3KM3KT1KT2KT1延時(shí)閉合觸頭閉合KM1線圈得電KM1KM2KM3KMKT1KT2KT3FU1FU2KHQSKH2023/2/416183L1L2L3M3～3SB2SB1KM3KMKMKT3KM2KM1KM3KM2KM1R1R2R3KMKM1KM2KM3KM3KT1KT2KM1觸頭閉合繞線轉(zhuǎn)子串聯(lián)R2,R3啟動(dòng)KT2線圈得電KM1KM2KM3KMKT1KT2KT3FU1FU2KHQSKH2023/2/417183L1L2L3M3～3SB2SB1KM3KMKMKT3KM2KM1KM3KM2KM1R1R2R3KMKM1KM2KM3KM3KT1KT2KT2延時(shí)閉合觸頭閉合KM2線圈得電KM1KM2KM3KMKT1KT2KT3FU1FU2KHQSKH2023/2/418183L1L2L3M3～3SB2SB1KM3KMKMKT3KM2KM1KM3KM2KM1R1R2R3KMKM1KM2KM3KM3KT1KT2KM2觸頭閉合繞線轉(zhuǎn)子串聯(lián)R3啟動(dòng)KT3線圈得電KM1KM2KM3KMKT1KT2KT3FU1FU2KHQSKH2023/2/419183L1L2L3M3～3SB2SB1KM3KMKMKT3KM2KM1KM3KM2KM1R1R2R3KMKM1KM2KM3KM3KT1KT2KT3延時(shí)閉合觸頭閉合KM3線圈得電KM1KM2KM3KMKT1KT2KT3FU1FU2KHQSKH2023/2/420183L1L2L3M3～3SB2SB1KM3KMKMKT3KM2KM1KM3KM2KM1R1R2R3KMKM1KM2KM3KM3KT1KT2KM3觸頭閉合繞線轉(zhuǎn)子切除全部電阻運(yùn)行KM1KM2KM3KMKT1KT2KT3FU1FU2KHQSKH2023/2/421183L1L2L3M3～3SB2SB1KM3KMKMKT3KM2KM1KM3KM2KM1R1R2R3KMKM1KM2KM3KM3KT1KT2KM3動(dòng)斷觸頭斷開KT1線圈失電KT1觸頭斷開KM1線圈失電KM1觸頭斷開KT2線圈失電KT2觸頭斷開電動(dòng)機(jī)繼續(xù)運(yùn)轉(zhuǎn)KM1KM2KM3KMKT1KT2KT3FU1FU2KHQSKH2023/2/4221834.電流繼電器自動(dòng)控制電路2023/2/423183L1L2L3FU1M3～3FU2KHSB2QSSB1KMKMKA1KM2KMR2R1KA2KHKA1KAKM3KA3R3KA3KM1KM1KM2KM3KA2KAKMKM1KM2KM3電路組成分析2023/2/424183L1L2L3FU1M3～3SB2SB1KMKMKA1KM2KMR2R1KA2KA1KAKM3KA3R3KA3KM1KM1KM2KM3KA2KAKMKM1KM2KM3合上QS按下SB1KM線圈得電FU2KHQSKH2023/2/425183L1L2L3FU1M3～3SB2SB1KMKMKA1KM2KMR2R1KA2KA1KAKM3KA3R3KA3KM1KM1KM2KM3KA2KAKMKM1KM2KM3KM觸頭閉合繞線轉(zhuǎn)子串聯(lián)全部電阻啟動(dòng)KＡ線圈得電FU2KHQSKH2023/2/426183L1L2L3FU1M3～3SB2SB1KMKMKA1KM2KMR2R1KA2KA1KAKM3KA3R3KA3KM1KM1KM2KM3KA2KAKMKM1KM2KM3KA動(dòng)合觸頭閉合因啟動(dòng)電流大,KA1,KA2.KA3的動(dòng)斷觸頭斷開,繼續(xù)串聯(lián)全部電阻啟動(dòng)FU2KHQSKH2023/2/427183L1L2L3FU1M3～3SB2SB1KMKMKA1KM2KMR2R1KA2KA1KAKM3KA3R3KA3KM1KM1KM2KM3KA2KAKMKM1KM2KM3因速度加快，電流減小，KA1欠電流,動(dòng)斷觸頭閉合KM1線圈得電KM1觸頭閉合串聯(lián)R2,R3繼續(xù)啟動(dòng)FU2KHQSKH2023/2/428183L1L2L3FU1M3～3SB2SB1KMKMKA1KM2KMR2R1KA2KA1KAKM3KA3R3KA3KM1KM1KM2KM3KA2KAKMKM1KM2KM3因速度再加快電流繼續(xù)減小KA2欠電流,動(dòng)斷觸頭閉合KM2線圈得電KM2觸頭閉合串聯(lián)R3繼續(xù)啟動(dòng)FU2KHQSKH2023/2/429183L1L2L3FU1M3～3SB2SB1KMKMKA1KM2KMR2R1KA2KA1KAKM3KA3R3KA3KM1KM1KM2KM3KA2KAKMKM1KM2KM3因速度再加快電流繼續(xù)減小KA3欠電流,動(dòng)斷觸頭閉合KM3線圈得電KM3觸頭閉合切除全部電阻全速運(yùn)行FU2KHQSKH2023/2/430183二、轉(zhuǎn)子繞組串聯(lián)頻敏變阻器啟動(dòng)控制線路頻敏變阻器是一種阻抗值隨頻率明顯變化、靜止的無觸點(diǎn)電磁元件。它實(shí)質(zhì)上是一個(gè)鐵心損耗非常大的三相電抗器。在電動(dòng)機(jī)啟動(dòng)時(shí)，將頻敏變阻器串接在轉(zhuǎn)子繞組中，啟動(dòng)完畢短接切除頻敏變阻器。2023/2/431183L1L2L3FU1FU2QSKM1KM1KM2RFKTKM2M3～KM1KHSB2SB1KTKM2KM2KM23電路組成分析KH2023/2/432183L1L2L3FU1KM1KM1KM2RFM3～SB2SB1KTKM2KM23合上QS按下SB1KM1線圈得電KT線圈得電KTKM2KM1KM2FU2QSKHKH2023/2/433183L1L2L3FU1KM1KM1KM2RFM3～SB2SB1KTKM2KM23KM1觸頭閉合電動(dòng)機(jī)串聯(lián)頻敏電阻啟動(dòng)KTKM2KM1KM2FU2QSKHKH2023/2/434183L1L2L3FU1KM1KM1KM2RFM3～SB2SB1KTKM2KM23KT延時(shí)