1、課題19 并勵直流電動機的正反轉和制動控制線路 掌握并勵直流電動機正反轉和制動控制線路的構成與工作原理, 能完成線路的安裝、調試與檢修。直流電動機實現正反轉有電樞繞組反接法和勵磁繞組反接法兩種。課題19 并勵直流電動機的正反轉和制動控制線路一、正反轉控制線路KM3KM2KM2KM1SB2KM2KM3KM1KM2KAL+L-KTKAKM2SB3KM1SB1KTKM1KM1MR并勵直流電機正反轉控制線路IQFKM2KM1電路分析KM2KM1課題19 并勵直流電動機的正反轉和制動控制線路KM3KM2KM2KM1SB2KM2KAKM2SB3KM1SB1KTKM1KM1MRIKM2KM1正轉啟動:合上Q

2、F勵磁繞組得電勵磁線圈KA得電，動合觸頭閉合KT線圈得電，延時閉合瞬時斷開觸頭斷開KM2KM1L+L-QFKM3KM1KM2KAKT課題19 并勵直流電動機的正反轉和制動控制線路KM3KM2KM2KM1SB2KM2KAKM2SB3KM1SB1KTKM1KM1MRIKM2KM1按下SB1KM1線圈得電，KM1觸頭動作電動機串聯 電阻正轉起動KT線圈失電KM2KM1L+L-QFKM3KM1KM2KAKT課題19 并勵直流電動機的正反轉和制動控制線路KM3KM2KM2KM1SB2KM2KAKM2SB3KM1SB1KTKM1KM1MRIKM2KM1KT經過整定時間KT動斷觸頭延時閉合, KM3線圈得電

3、KM3觸頭閉合切除電阻電動機全速運行KM2KM1L+L-QFKM3KM1KM2KAKT課題19 并勵直流電動機的正反轉和制動控制線路KM3KM2KM2KM1SB2KM2KAKM2SB3KM1SB1KTKM1KM1MRIKM2KM1停:按下SB3KM2KM1L+L-QFKM3KM1KM2KAKT課題19 并勵直流電動機的正反轉和制動控制線路KM3KM2KM2KM1SB2KM2KAKM2SB3KM1SB1KTKM1KM1MRIKM2KM1反轉啟動:合上QF勵磁繞組得電勵磁線圈KA得電，動合觸頭閉合KT線圈得電，延時閉合瞬時斷開觸頭斷開KM2KM1L+L-QFKM3KM1KM2KAKT課題19 并勵

4、直流電動機的正反轉和制動控制線路KM3KM2KM2KM1SB2KM2KAKM2SB3KM1SB1KTKM1KM1MRIKM2KM1按下SB2KM2線圈得電，KM2觸頭動作電動機串聯 電阻反轉起動KT線圈失電KM2KM1L+L-QFKM3KM1KM2KAKT課題19 并勵直流電動機的正反轉和制動控制線路KM3KM2KM2KM1SB2KM2KAKM2SB3KM1SB1KTKM1KM1MRIKM2KM1KT經過整定時間KT動斷觸頭延時閉合, KM3線圈得電KM3觸頭閉合切除電阻電動機全速運行KM2KM1L+L-QFKM3KM1KM2KAKT課題19 并勵直流電動機的正反轉和制動控制線路 能耗制動是指

5、保持直流電動機的勵磁電流不變，將電樞繞組的電源切除后，立即使其與制動電阻連接成閉合回路，電樞憑慣性處于發電運行狀態，將動能轉化為電能并消耗在電樞回路中，同時獲得制動力矩，迫使電動機迅速停轉。.能耗制動控制線路二、制動控制線路課題19 并勵直流電動機的正反轉和制動控制線路L+KVQFKM2KAKA1VRKM1KM2KM1KM1KT1RBSB1KM1KT2KT1并勵直流電動機能耗制動原理 IKM3SB2KM1KM1RBKAMUKM4KM4KM3KT2R1R2AKM1L電路組成分析L+KVQFKM2KAKA1VRKM1KM2KM1KM1KT1RBSB1KM1KT2KT1并勵直流電動機能耗制動原理 I

6、KM3SB2KM1KM1RBKAMUKM4KM4KM3KT2R1R2AKM1L合上QFL+KVQFKM2KAKA1VRKM1KM2KM1KM1KT1RBSB1KM1KT2KT1并勵直流電動機能耗制動原理 IKM3SB2KM1KM1RBKAMUKM4KM4KM3KT2R1R2AKM1L按下SB1L+KVQFKM2KAKA1VRKM1KM2KM1KM1KT1RBSB1KM1KT2KT1并勵直流電動機能耗制動原理 IKM3SB2KM1KM1RBKAMUKM4KM4KM3KT2R1R2AKM1LKT1瞬時斷開延時閉合觸頭閉合L+KVQFKM2KAKA1VRKM1KM2KM1KM1KT1RBSB1KM1

7、KT2KT1并勵直流電動機能耗制動原理 IKM3SB2KM1KM1RBKAMUKM4KM4KM3KT2R1R2AKM1LKT2瞬時斷開延時閉合觸頭閉合L+KVQFKM2KAKA1VRKM1KM2KM1KM1KT1RBSB1KM1KT2KT1并勵直流電動機能耗制動原理 IKM3SB2KM1KM1RBKAMUKM4KM4KM3KT2R1R2AKM1L按下SB2L+KVQFKM2KAKA1VRKM1KM2KM1KM1KT1RBSB1KM1KT2KT1并勵直流電動機能耗制動原理 IKM3SB2KM1KM1RBKAMUKM4KM4KM3KT2R1R2AKM1LKV閉合KM2線圈得電KM2閉合能耗制動開始

8、L+KVQFKM2KAKA1VRKM1KM2KM1KM1KT1RBSB1KM1KT2KT1并勵直流電動機能耗制動原理 IKM3SB2KM1KM1RBKAMUKM4KM4KM3KT2R1R2AKM1L速度減小到一定值時,KV分斷L+KVQFKM2KAKA1VRKM1KM2KM1KM1KT1RBSB1KM1KT2KT1并勵直流電動機能耗制動原理 IKM3SB2KM1KM1RBKAMUKM4KM4KM3KT2R1R2AKM1L電動機停轉.反接制動控制線路直流電動機的反接制動，通常是通過改變電樞兩端電壓極性或改變勵磁電流的方向來改變電磁轉矩的方向，形成制動轉矩，從而迫使電動機迅速停轉。課題19 并勵直

9、流電動機的正反轉和制動控制線路L+KVQFKM2KAKM1KM2KM5KM3KT1SB2KT2KT1 IKM3KM1KM4KT2L電路組成分析MKASB3SB1KM1KM4KM2KM5KM3KM2KM2KM1KVKM1KM1KM2KM4KM5KM1KM2KM1KM2KM6KM7KM3KM6KM7RBR1R2L+KVQFKM2KAKM1KM2KM5KM3KT1SB2KT2KT1 IKM3KM1KM4KT2L合上QFMKASB3SB1KM1KM4KM2KM5KM3KM2KM2KM1KVKM1KM1KM2KM1KM2KM1KM2KM6KM7KM3KM6KM7RBR1R2KM4KM5L+KVQFKM2

10、KAKM1KM2KM5KM3KT1SB2KT2KT1 IKM3KM1KM4KT2L按下SB1KM1線圈得電MKASB3SB1KM1KM4KM2KM5KM3KM2KM2KM1KVKM1KM1KM2KM1KM2KM1KM2KM6KM7KM3KM6KM7RBR1R2KM4KM5L+KVQFKM2KAKM1KM2KM5KM3KT1SB2KT2KT1 IKM3KM1KM4KT2LKM1觸頭動作電動機串聯全部電阻啟動MKASB3SB1KM1KM4KM2KM5KM3KM2KM2KM1KVKM1KM1KM2KM1KM2KM1KM2KM6KM7KM3KM6KM7RBR1R2KM4KM5L+KVQFKM2KAKM

11、1KM2KM5KM3KT1SB2KT2KT1 IKM3KM1KM4KT2LMKASB3SB1KM1KM4KM2KM5KM3KM2KM2KM1KVKM1KM1KM2KM1KM2KM1KM2KM6KM7KM3KM6KM7RBR1R2KT1經過整定時間KT1動斷觸頭延時閉合, KM6線圈得電KM6觸頭閉合電動機串聯R2繼續啟動KM4KM5L+KVQFKM2KAKM1KM2KM5KM3KT1SB2KT2KT1 IKM3KM1KM4KT2LMKASB3SB1KM1KM4KM2KM5KM3KM2KM2KM1KVKM1KM1KM2KM1KM2KM1KM2KM6KM7KM3KM6KM7RBR1R2KV線圈升高

12、到一定值KV觸頭閉合電動機串聯R2繼續啟動KM4KM5L+KVQFKM2KAKM1KM2KM5KM3KT1SB2KT2KT1 IKM3KM1KM4KT2LMKASB3SB1KM1KM4KM2KM5KM3KM2KM2KM1KVKM1KM1KM2KM1KM2KM1KM2KM6KM7KM3KM6KM7RBR1R2KT2經過整定時間KT2動斷觸頭延時閉合, KM7線圈得電KM7觸頭閉合切除全部電阻電動機繼續啟動全速運行KM4KM5L+KVQFKM2KAKM1KM2KM5KM3KT1SB2KT2KT1 IKM3KM1KM4KT2LMKASB3SB1KM1KM4KM2KM5KM3KM2KM2KM1KVKM

13、1KM1KM2KM1KM2KM1KM2KM6KM7KM3KM6KM7RBR1R2按下SB3KM1線圈失電KM4KM5L+KVQFKM2KAKM1KM2KM5KM3KT1SB2KT2KT1 IKM3KM1KM4KT2LMKASB3SB1KM1KM4KM2KM5KM3KM2KM2KM1KVKM1KM1KM2KM1KM2KM1KM2KM6KM7KM3KM6KM7RBR1R2KM1觸頭動作KM4KM5L+KVQFKM2KAKM1KM2KM5KM3KT1SB2KT2KT1 IKM3KM1KM4KT2LMKASB3SB1KM1KM4KM2KM5KM3KM2KM2KM1KVKM1KM1KM2KM1KM2KM1KM2KM6KM7KM3KM6KM7RBR1R2KM3線圈得電KM3觸頭動作SB3動合觸頭閉合KM2線圈得電KM4KM5L+KVQFKM2KAKM1KM2KM5KM3KT1SB2KT2KT1 IKM3KM1KM4KT2LMKASB3SB1KM1KM4KM2KM5KM3KM2KM2KM1KVKM1KM1KM2