現在在很多的設備都在使用變頻電機，那么使用這種電機，有(you)什么優勢，今(jin)天(tian)給(gei)大家一(yi)個正確(que)的指引：

變頻調速的優點：

1、調速(su)效(xiao)率高，屬于高效(xiao)調速(su)方式。這是由于在頻率變化后，電(dian)動(dong)機仍在同步轉速(su)附近運行，基本(ben)保持(chi)額定轉差。只是在變頻裝置系統(tong)中(zhong)會產生(sheng)變流損(sun)失，以及由于高次(ci)諧波的影響，電(dian)動(dong)機的損(sun)耗增加，從而效(xiao)率有所下降(jiang)。

2、調(diao)速范(fan)圍(wei)寬，一般(ban)可達20:1，并在整(zheng)個調(diao)速范(fan)圍(wei)內具有高的(de)調(diao)速效(xiao)率(lv)。所(suo)以變(bian)頻調(diao)速適(shi)用(yong)于調(diao)速范(fan)圍(wei)寬，且(qie)經常處于低負荷狀態下(xia)運行的(de)場合。

3、機械特性較硬(ying)，在無自動(dong)控制(zhi)時，轉(zhuan)速(su)變化率(lv)在5%以下；當采用自動(dong)控制(zhi)時，能(neng)做高(gao)精度運行，把轉(zhuan)速(su)波(bo)動(dong)率(lv)控制(zhi)在0.5%|~1%左右。

4、變頻裝(zhuang)置萬一發生故(gu)障，可(ke)以(yi)退(tui)出運行，改(gai)由電(dian)網(wang)直接(jie)供電(dian)，泵或風機仍可(ke)繼(ji)續(xu)保(bao)持運轉。

5、能兼作啟動(dong)設備，即通過變頻電(dian)(dian)(dian)源將電(dian)(dian)(dian)動(dong)機(ji)(ji)啟動(dong)到(dao)某一(yi)轉速，再斷開變頻電(dian)(dian)(dian)源，電(dian)(dian)(dian)動(dong)機(ji)(ji)可直接接到(dao)工頻電(dian)(dian)(dian)源使(shi)泵或風機(ji)(ji)加速到(dao)全速。在變頻電(dian)(dian)(dian)源向工頻電(dian)(dian)(dian)源切換時(shi)，一(yi)般有沖(chong)擊(ji)(ji)電(dian)(dian)(dian)流(liu)產(chan)生(sheng)，電(dian)(dian)(dian)網電(dian)(dian)(dian)壓瞬時(shi)下(xia)降，電(dian)(dian)(dian)動(dong)機(ji)(ji)受到(dao)機(ji)(ji)械沖(chong)擊(ji)(ji)。為(wei)了防(fang)止(zhi)這(zhe)種現象的產(chan)生(sheng)，可在電(dian)(dian)(dian)動(dong)機(ji)(ji)和工頻電(dian)(dian)(dian)源之(zhi)間(jian)并聯一(yi)個啟動(dong)電(dian)(dian)(dian)抗(kang)器，以便在啟動(dong)時(shi)抑(yi)制(zhi)沖(chong)擊(ji)(ji)電(dian)(dian)(dian)流(liu)的產(chan)生(sheng)。若(ruo)原(yuan)動(dong)機(ji)(ji)為(wei)同步電(dian)(dian)(dian)動(dong)機(ji)(ji)，則(ze)需(xu)進行“同步切換”。