點擊圖片查看大圖DR1015B80
DR1015B80
JARCR-XCU03
假設已經確定的電動機運行頻率為fmax低運行頻率為fmin與此對應的轉矩相對值為tTL，則電動機的額定轉矩Tn=TL/qTL（TL負載轉矩）。如果原選電機并未留有余量的話，則配用變頻調速器后，電動機的容量應擴大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速nDmax負載所需求的轉速nLmax之比。
?。?）恒功率負載：和恒轉矩負載類似，首先根據(jù)有效功率線和頻率調節(jié)范圍，求出電動機運行頻率的上、下限。
如果干擾嚴重，甚至可以分別用兩個電源，一般用電感和電容隔離就行了。
同樣，在求出和低運行頻率的同時，得到對應的功率相對值tPL，而電動機的額定功率PN≥PL／tPL（PL為負載要求功率）。
在設計恒功率負載時，應注意兩點：（1）盡量多利用額定頻率以上的部分；（2）當調整范圍較大時，盡量采用兩檔傳動比。因為當傳動比分成兩欄時，頻率范圍αf與αn轉速范圍之間的關系為 ?？梢?，在轉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。
單片機中數(shù)字和模擬之間，因為數(shù)字信號是頻譜很寬的脈沖信號。
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與縱坐標的乘積均相等，且與負載功率成正比，即PL=KPTLnL=KPTLmaxLmin 。全部轉速都在額定頻率以下調節(jié)時的有效轉矩線，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，是很不經濟的。
⑴當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。
⑵ 當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。可見，對于恒功率負載，當αn》4時，這種方案是比較理想的。
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