IC693MDL734

IC693MDL734

IC693MDL734

IC693MDL734

有時(shí)候，電機(jī)冒煙了，可別盡說變頻器不行??！

對(duì)于VF控制的標(biāo)量變頻器，用下面這張圖，可作比較的詮釋，如下:

UN為額定電壓，大可視為380V，fN為基本頻率，50Hz?；绢l率是變頻器高輸出電壓所對(duì)應(yīng)的頻率，比如常用的低壓變頻，基頻是50Hz，高輸出電壓則為380V。這應(yīng)該沒多大異議！

0～50Hz這個(gè)左開右閉的區(qū)間基本可算作工作區(qū)。在這個(gè)區(qū)間內(nèi)，電壓與頻率的比值接近于常數(shù)C，也是為了滿足磁通φ的恒定。

       過了基頻，會(huì)發(fā)現(xiàn)隨著頻率的增加，輸出電壓不再成比例升高了，而是進(jìn)入了直線狀態(tài)，恒功率區(qū)。也就是說，過了基頻，變頻器的輸出功率將保持恒定，不再以頻率的變化而發(fā)生變化。

       越過基頻調(diào)速，意味著電機(jī)定子頻率將大于50Hz，電機(jī)轉(zhuǎn)速將超過額定轉(zhuǎn)速。若此時(shí)電壓與頻率仍保持的比例關(guān)系，隨著頻率增大，定子電壓勢(shì)必也要增大，如此，會(huì)對(duì)定子絕緣造成威脅。所以，當(dāng)fx大于基頻時(shí)，要把定子電壓限制為額定電壓，并保持不變。

在這個(gè)區(qū)間內(nèi)，頻率升高而電壓保持不變，根據(jù)U/f≈C（常數(shù)）可知，磁通φ必然跟著下降，可看一下圖中φm的變化趨勢(shì)，反映在所驅(qū)動(dòng)的電機(jī)上，電機(jī)轉(zhuǎn)速是上去了，但電磁轉(zhuǎn)矩卻降低了。因?yàn)椋姍C(jī)的電磁轉(zhuǎn)矩取決于磁通φ和轉(zhuǎn)子電流I2，T=kφmI2cosΦ2。

      假如有一臺(tái)變頻驅(qū)動(dòng)的電機(jī)，感覺它轉(zhuǎn)的不夠過癮，非得把它的基本頻率整的老高，至少超50，就60吧！此時(shí)會(huì)出現(xiàn)啥情況哪？這要看驅(qū)動(dòng)的負(fù)載類型，假如是一條皮帶，皮帶提速后，負(fù)載功率肯定會(huì)隨轉(zhuǎn)速的增加而增大，負(fù)載功率取決于電機(jī)輸出功率，電機(jī)輸出功率又取決于變頻器輸出功率，而此時(shí)的變頻器輸出功率將保持恒功率，如此，負(fù)載功率勢(shì)必要大于電機(jī)輸出功率。

     電機(jī)為了保證能拖動(dòng)負(fù)載，保持與負(fù)載的平衡關(guān)系，勢(shì)必要想法設(shè)法地去提高輸出轉(zhuǎn)矩，只有一個(gè)辦法，就是把轉(zhuǎn)子電流給增大，轉(zhuǎn)子電流增大，則意味著定子電流增大。這又將意味著什么哪？電機(jī)過載??！沒準(zhǔn)一會(huì)功夫就能把電機(jī)給干?；蚴侵苯咏o干冒煙了！

所以，在這個(gè)參數(shù)的設(shè)置上，沒有什么特殊情況，不要隨意的去改變它，保持默認(rèn)即可，一般都是50，具體參照銘牌。

      但也有特殊情況，一般不常見，比如你手頭上有一臺(tái)三相220V的電機(jī)和一臺(tái)380的變頻，這時(shí)就得將變頻器的高輸出電壓調(diào)整到220V。反之亦然！

本篇就簡單說這么一些，在這一點(diǎn)上，還是出過事的，就拿出來說道說道?？傮w來說，還是無知者無畏，瞎搗鼓引起的！

以上有若不對(duì)的地方，還請(qǐng)批評(píng)指正吧！

LEYBOLD HERAEUS 013-58-021-939  01358021939

KOLLMORGEN IND ME9-203-B-AQ9-254  ME9203BAQ9254

KENT TAYLOR 6202NZ10000B-1342  6202NZ10000B1342

INSTRUMENT TRANSFORMERS INC 3CPT3-60-30-SD07026  3CPT36030SD07026

INDRAMAT MDD112D-N-030-N2M-130PB0  MDD112DN030N2M1A

INDRAMAT MDD093B-N-020-N2L-110PB0  MDD093BN020N2L11

INDRAMAT MDD071C-N-030-N2S-095GB0  MDD071CN030N2S0A

INDRAMAT MDD071C-N-030-N2L-095GA0  MDD071CN030N2L09

INDRAMAT DSC3.1-50-115  DSC3150115

INDRAMAT DSC3.1-050-115V  DSC31050115V

INDRAMAT 2AD132D-B35OB1-AS03-B2N1  2AD132DB35OB1AS1

INDRAMAT 2AD100D-B050B1-AS03-B2N1  2AD100DB050B1AS0

IMPERIAL 08124800  08124800

HYDRAULIC VALVE DIVISION BD90  BD90

HONEYWELL 51304511100  51304511100

HOFFMAN ENCLOSURES PTRS362424XA  PTRS362424XA

HOERBIGER ORIGA P55001004000-00755  P550010040000075

GOULDS PUMP 3196-6X8-13  31966X813

GIDDINGS & LEWIS 502-03927-03  5020392703

GIDDINGS & LEWIS 401-34401-00  4013440100

GENERAL ELECTRIC L90-G00-HPH-F8F-H6C-LXX-N6S-S6U-U6U-W7R  L90G00HPHF8FH6CL

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