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70A-2-2249
A20B-2900-0650/02A
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負載所需求的轉(zhuǎn)速nLmax之比。
?。?）恒功率負載：和恒轉(zhuǎn)矩負載類似，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。
輸入濾波器有助于保護電源不受電源電壓瞬態(tài)的影響，在動態(tài)負載變化過程中提供一些能量存儲
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為負載要求功率）。
在設(shè)計恒功率負載時，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。
所以變壓器的效率很低，一般不會超過35%。
負載的機械特性，因是恒功率負載，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載功率的On倍還要大，是很不經(jīng)濟的。
⑴當(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?？梢姡瑢τ诤愎β守撦d，當(dāng)αn》4時，這種方案是比較理想的。
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