MR-S1-80-E01
MR-S1-80-E01
N0342EE-KMSB
假設(shè)已經(jīng)確定的電動機運行頻率為fmax低運行頻率為fmin與此對應(yīng)的轉(zhuǎn)矩相對值為tTL,則電動機的額定轉(zhuǎn)矩Tn=TL/qTL(TL負(fù)載轉(zhuǎn)矩)。如果原選電機并未留有余量的話,則配用變頻調(diào)速器后,電動機的容量應(yīng)擴大1/tTL倍。傳動系統(tǒng)的傳動比入等于電動機在運行頻率下的轉(zhuǎn)速nDmax負(fù)載所需求的轉(zhuǎn)速nLmax之比。
?。?)恒功率負(fù)載:和恒轉(zhuǎn)矩負(fù)載類似,首先根據(jù)有效功率線和頻率調(diào)節(jié)范圍,求出電動機運行頻率的上、下限。
也可以將整個板子上數(shù)字和模擬部分的電源分別聯(lián)在一起,用分別的通路直接接到電源濾波電容的焊點上。
同樣,在求出和低運行頻率的同時,得到對應(yīng)的功率相對值tPL,而電動機的額定功率PN≥PL/tPL(PL為負(fù)載要求功率)。
在設(shè)計恒功率負(fù)載時,應(yīng)注意兩點:(1)盡量多利用額定頻率以上的部分;(2)當(dāng)調(diào)整范圍較大時,盡量采用兩檔傳動比。因為當(dāng)傳動比分成兩欄時,頻率范圍αf與αn轉(zhuǎn)速范圍之間的關(guān)系為 。可見,在轉(zhuǎn)速范圍相同的情況下,頻率范圍將大為減小,從而可減小電動機的容量。
如果對抗干擾要求不高,也可以隨便接在一起。
負(fù)載的機械特性,因是恒功率負(fù)載,故曲線上任一點的橫坐標(biāo)與縱坐標(biāo)的乘積均相等,且與負(fù)載功率成正比,即PL=KPTLnL=KPTLmaxLmin 。全部轉(zhuǎn)速都在額定頻率以下調(diào)節(jié)時的有效轉(zhuǎn)矩線,在這種情況下,所需電動機的容量PN=KPTNnLmax》KPTLmaxLmax=αnPL。這說明,所需電動機的容量比負(fù)載功率的On倍還要大,是很不經(jīng)濟的。
?、女?dāng)運行頻率為額定頻率的2倍,傳動比只有一檔時的情形。在這種情況下,所需電機的容量PN=KPTN1/2nLmax 1/2αnPL??梢?,所需用容量只要大于負(fù)載功率的On/2倍就可以了。
?、?當(dāng)運行頻率為額定頻率的2倍,傳動比為兩檔時的情形。這時,所需電機的容量PN1/2 PL??梢?,對于恒功率負(fù)載,當(dāng)αn》4時,這種方案是比較理想的。
聯(lián)系人:王工
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