永磁同步電機與(yu)異步電機相比,具有(you)明顯的優勢,它效率(lv)高,功率(lv)因素高,能力指標好,體積小,重量輕,溫升低,技能效果顯著(zhu),較好地提(ti)高了(le)電網的品(pin)質(zhi)因素,充分發揮(hui)了(le)現(xian)(xian)有(you)電網的容量,節省了(le)電網的投資,它極(ji)大(da)的解決了(le)用電設(she)備中“大(da)馬(ma)拉(la)小車”現(xian)(xian)象。
1.效(xiao)率(lv)及(ji)功率(lv)因素
異步電(dian)(dian)(dian)機在工作時,轉子繞(rao)組(zu)要從電(dian)(dian)(dian)網吸(xi)收部(bu)(bu)分(fen)電(dian)(dian)(dian)能勵磁(ci),消耗了電(dian)(dian)(dian)網電(dian)(dian)(dian)能,這部(bu)(bu)分(fen)電(dian)(dian)(dian)能最終以電(dian)(dian)(dian)流(liu)在轉子繞(rao)組(zu)中發熱消耗掉(diao),該損(sun)耗約(yue)占電(dian)(dian)(dian)機總損(sun)耗的20~30%,它(ta)使(shi)電(dian)(dian)(dian)機的效率降低(di)。
2.起動轉矩
異步電(dian)(dian)(dian)機起(qi)(qi)動(dong)(dong)時(shi),要求電(dian)(dian)(dian)機具有足夠(gou)大(da)的(de)(de)起(qi)(qi)動(dong)(dong)轉矩,但(dan)又希望(wang)起(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)流不要太大(da),以免電(dian)(dian)(dian)網(wang)產生過大(da)的(de)(de)電(dian)(dian)(dian)壓降落而影響(xiang)接(jie)在電(dian)(dian)(dian)網(wang)上的(de)(de)其他電(dian)(dian)(dian)機和電(dian)(dian)(dian)氣設備(bei)的(de)(de)正常(chang)運行。此外,起(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)流過大(da)時(shi),將使電(dian)(dian)(dian)機本身受(shou)到過大(da)電(dian)(dian)(dian)做(zuo)力的(de)(de)沖擊,如果經常(chang)起(qi)(qi)動(dong)(dong),還有使繞(rao)組(zu)過熱的(de)(de)危險。因(yin)此,異步電(dian)(dian)(dian)機的(de)(de)起(qi)(qi)動(dong)(dong)設計往(wang)往(wang)面臨著兩難選(xuan)擇。
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