電機的特性可以節省能源并降低長期運行成本。 它們非常適用于紡織品，風扇，水泵和壓縮機。 他們可以通過節省一年的電力來收回電機購買成本； 直接啟動或使用變頻器來調節速度并更換異步電動機。 稀土永磁節能電動機本身可比普通電動機節電15％以上； 電機功率因數接近1，無需功率因數補償器即可提高電網質量因數； 電動機電流小，節省了輸配電能力，延長了系統的整體使用壽命； 節能預算：以55千瓦電機為例。

　　 電(dian)(dian)(dian)動(dong)機(ji)比普(pu)通(tong)電(dian)(dian)(dian)動(dong)機(ji)節省(sheng)15％的電(dian)(dian)(dian)力。 電(dian)(dian)(dian)費(fei)按(an)每度電(dian)(dian)(dian)0.5元計算。 節能(neng)(neng)電(dian)(dian)(dian)動(dong)機(ji)可用(yong)于節省(sheng)一(yi)年內(nei)更換(huan)電(dian)(dian)(dian)動(dong)機(ji)的成(cheng)本。 變(bian)頻(pin)器(qi)(qi)(qi)是一(yi)種(zhong)電(dian)(dian)(dian)能(neng)(neng)控(kong)制設備，利用(yong)功率半導體器(qi)(qi)(qi)件的開(kai)關效(xiao)應(ying)將商用(yong)頻(pin)率電(dian)(dian)(dian)源轉換(huan)為另一(yi)個頻(pin)率。 我們現在使(shi)用(yong)的變(bian)頻(pin)器(qi)(qi)(qi)主要采(cai)用(yong)單向單向方式（VVV變(bian)頻(pin)或矢量控(kong)制變(bian)頻(pin)）。 

　　將(jiang)工(gong)業頻率的交流電(dian)(dian)(dian)(dian)(dian)(dian)(dian)通(tong)過整(zheng)流器轉換為(wei)直流電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，然后將(jiang)直流電(dian)(dian)(dian)(dian)(dian)(dian)(dian)轉換為(wei)可(ke)以控(kong)制其頻率和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)的交流電(dian)(dian)(dian)(dian)(dian)(dian)(dian)。 電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)已供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)。 逆(ni)(ni)變(bian)(bian)器電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路一般由四部分(fen)(fen)組成：整(zheng)流，中(zhong)間直流環節，逆(ni)(ni)變(bian)(bian)器和(he)控(kong)制。 整(zheng)流部分(fen)(fen)是三相橋式(shi)不(bu)可(ke)控(kong)整(zheng)流器，逆(ni)(ni)變(bian)(bian)器部分(fen)(fen)是IGBT三相橋式(shi)逆(ni)(ni)變(bian)(bian)器，輸出是PW形中(zhong)間直流鏈(lian)路，用于(yu)濾(lv)波，直流能量存儲和(he)緩沖(chong)的無功功率。在(zai)使用變(bian)(bian)頻器驅動高(gao)速(su)(su)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)時，由于(yu)高(gao)速(su)(su)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)的電(dian)(dian)(dian)(dian)(dian)(dian)(dian)抗(kang)小,高(gao)次諧波增加導致輸出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流值增大。因此用于(yu)高(gao)速(su)(su)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)的變(bian)(bian)頻器的選型,其容量要稍大于(yu)普(pu)通(tong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)的選型。

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