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1.導(dǎo)語(yǔ)
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(zhǎng)足的跋涉。怎么在不一樣使用條件下充分開(kāi)發(fā)變頻器本身功用、有用的降低設(shè)備的改形本錢(qián)已成為一個(gè)主要疑問(wèn)。與通常的控制方法比照，使用變頻器直流制動(dòng)功用結(jié)束交流拖動(dòng)系統(tǒng)精確泊車(chē)的計(jì)劃計(jì)劃省去了價(jià)值寶貴的變頻器專(zhuān)用制動(dòng)單元／制動(dòng)電阻，有用降低了設(shè)備改形本錢(qián)，工作安穩(wěn)可靠、控制精度高。
2.VVVF能耗制動(dòng)的理論分析
通用變頻器供給的制動(dòng)方法主要有：能耗制動(dòng)、再生制動(dòng)、整流回饋等。在轉(zhuǎn)動(dòng)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(dòng)電阻和制動(dòng)單元的再生制動(dòng)方法，某些情況下可以協(xié)作選用直流制動(dòng)。這一計(jì)劃思路底子為大多數(shù)目?jī)?nèi)用戶所接受，并在實(shí)踐使用中獲得了較好的作用。但該計(jì)劃需其他收購(gòu)變頻器廠家供給的專(zhuān)用制動(dòng)單元／制動(dòng)電阻，無(wú)形中增大了改形本錢(qián)。
所謂“直流制動(dòng)”，通常指當(dāng)變頻器的輸出頻率靠近為零，電機(jī)的轉(zhuǎn)速降低到必定數(shù)值時(shí)，變頻器改向異步電動(dòng)機(jī)定子繞組中通入直流，構(gòu)成間斷磁場(chǎng)，此時(shí)電動(dòng)機(jī)處于能耗制動(dòng)情況，轉(zhuǎn)動(dòng)著的轉(zhuǎn)子切開(kāi)該間斷磁場(chǎng)而發(fā)作制動(dòng)轉(zhuǎn)矩，使電動(dòng)機(jī)活絡(luò)間斷。在電動(dòng)機(jī)制動(dòng)進(jìn)程中，因?yàn)樽冾l器輸出頻率逐漸降低，則定子繞組內(nèi)的同步磁場(chǎng)轉(zhuǎn)速低于轉(zhuǎn)子轉(zhuǎn)速，電動(dòng)機(jī)處于再生制動(dòng)進(jìn)程，此時(shí)旋轉(zhuǎn)系統(tǒng)存儲(chǔ)的動(dòng)能轉(zhuǎn)換成電能熱損耗的方法消耗于異步電動(dòng)機(jī)的轉(zhuǎn)子回路中，為避免電動(dòng)機(jī)減速進(jìn)程中所構(gòu)成的再生發(fā)電制動(dòng)以及直流制動(dòng)進(jìn)程中的能量回饋，構(gòu)成變頻器和電機(jī)的損壞，需串入專(zhuān)用制動(dòng)單元／制動(dòng)電阻。

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