1.導(dǎo)語
這些年，跟著變頻器本身功用的不斷完善，交流調(diào)速技術(shù)有了長足的跋涉。怎么在不一樣使用條件下充分開發(fā)變頻器本身功用、有用的降低設(shè)備的改形本錢已成為一個主要疑問。與通常的控制方法比照，使用變頻器直流制動功用結(jié)束交流拖動系統(tǒng)精確泊車的計劃計劃省去了價值寶貴的變頻器專用制動單元／制動電阻，有用降低了設(shè)備改形本錢，工作安穩(wěn)可靠、控制精度高。
2.VVVF能耗制動的理論分析
通用變頻器供給的制動方法主要有：能耗制動、再生制動、整流回饋等。在轉(zhuǎn)動慣量較大的工況條件下，變頻器廠家所主張選用的通常方法是外接制動電阻和制動單元的再生制動方法，某些情況下可以協(xié)作選用直流制動。這一計劃思路底子為大多數(shù)目內(nèi)用戶所接受，并在實踐使用中獲得了較好的作用。但該計劃需其他收購變頻器廠家供給的專用制動單元／制動電阻，無形中增大了改形本錢。
所謂“直流制動”，通常指當(dāng)變頻器的輸出頻率靠近為零，電機的轉(zhuǎn)速降低到必定數(shù)值時，變頻器改向異步電動機定子繞組中通入直流，構(gòu)成間斷磁場，此時電動機處于能耗制動情況，轉(zhuǎn)動著的轉(zhuǎn)子切開該間斷磁場而發(fā)作制動轉(zhuǎn)矩，使電動機活絡(luò)間斷。在電動機制動進程中，因為變頻器輸出頻率逐漸降低，則定子繞組內(nèi)的同步磁場轉(zhuǎn)速低于轉(zhuǎn)子轉(zhuǎn)速，電動機處于再生制動進程，此時旋轉(zhuǎn)系統(tǒng)存儲的動能轉(zhuǎn)換成電能熱損耗的方法消耗于異步電動機的轉(zhuǎn)子回路中，為避免電動機減速進程中所構(gòu)成的再生發(fā)電制動以及直流制動進程中的能量回饋，構(gòu)成變頻器和電機的損壞，需串入專用制動單元／制動電阻。
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