變(bian)頻(pin)器(qi)節能主要表現在(zai)風(feng)(feng)機(ji)、水(shui)(shui)泵的(de)(de)應用(yong)(yong)上。為了保證生產(chan)的(de)(de)可靠性，各種(zhong)生產(chan)機(ji)械在(zai)設計配(pei)用(yong)(yong)動(dong)力(li)驅動(dong)時，都留有(you)一定的(de)(de)富余量(liang)。當電機(ji)不能在(zai)滿負(fu)荷下運行時，除達到動(dong)力(li)驅動(dong)要求(qiu)(qiu)外，多(duo)余的(de)(de)力(li)矩增加了有(you)功功率的(de)(de)消耗，造成電能的(de)(de)浪(lang)費。風(feng)(feng)機(ji)、泵類(lei)等(deng)設備傳(chuan)統的(de)(de)調速方法是通過(guo)調節入(ru)口(kou)或出口(kou)的(de)(de)擋板、閥門(men)開度來調節給風(feng)(feng)量(liang)和給水(shui)(shui)量(liang)，其(qi)輸入(ru)功率大(da)，且大(da)量(liang)的(de)(de)能源(yuan)消耗在(zai)擋板、閥門(men)的(de)(de)截(jie)流(liu)過(guo)程中。當使用(yong)(yong)變(bian)頻(pin)調速時，如果流(liu)量(liang)要求(qiu)(qiu)減小，通過(guo)降低泵或風(feng)(feng)機(ji)的(de)(de)轉速即可滿足要求(qiu)(qiu)。

電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)使用(yong)(yong)變(bian)(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)的(de)(de)(de)作用(yong)(yong)就(jiu)是為(wei)(wei)(wei)(wei)了調速，并降(jiang)低啟動(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)。為(wei)(wei)(wei)(wei)了產生(sheng)可(ke)變(bian)(bian)(bian)(bian)(bian)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓和(he)頻(pin)(pin)(pin)率，該設備(bei)首先要(yao)把電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)的(de)(de)(de)交(jiao)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)變(bian)(bian)(bian)(bian)(bian)換為(wei)(wei)(wei)(wei)直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)（DC），這個(ge)過程叫(jiao)整(zheng)流(liu)。把直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)（DC）變(bian)(bian)(bian)(bian)(bian)換為(wei)(wei)(wei)(wei)交(jiao)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)（AC）的(de)(de)(de)裝(zhuang)置，其(qi)科學(xue)術語為(wei)(wei)(wei)(wei)“inverter”(逆(ni)(ni)變(bian)(bian)(bian)(bian)(bian)器(qi)(qi))。一(yi)(yi)般逆(ni)(ni)變(bian)(bian)(bian)(bian)(bian)器(qi)(qi)是把直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)逆(ni)(ni)變(bian)(bian)(bian)(bian)(bian)為(wei)(wei)(wei)(wei)一(yi)(yi)定(ding)的(de)(de)(de)固定(ding)頻(pin)(pin)(pin)率和(he)一(yi)(yi)定(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓的(de)(de)(de)逆(ni)(ni)變(bian)(bian)(bian)(bian)(bian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)。對(dui)(dui)于(yu)(yu)逆(ni)(ni)變(bian)(bian)(bian)(bian)(bian)為(wei)(wei)(wei)(wei)頻(pin)(pin)(pin)率可(ke)調、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓可(ke)調的(de)(de)(de)逆(ni)(ni)變(bian)(bian)(bian)(bian)(bian)器(qi)(qi)我們稱為(wei)(wei)(wei)(wei)變(bian)(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)。變(bian)(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)輸(shu)出(chu)的(de)(de)(de)波形(xing)是模擬(ni)正弦(xian)波，主(zhu)(zhu)要(yao)是用(yong)(yong)在(zai)(zai)三相異步電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)調速用(yong)(yong)，又(you)叫(jiao)變(bian)(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)調速器(qi)(qi)。對(dui)(dui)于(yu)(yu)主(zhu)(zhu)要(yao)用(yong)(yong)在(zai)(zai)儀(yi)器(qi)(qi)儀(yi)表的(de)(de)(de)檢測(ce)設備(bei)中的(de)(de)(de)波形(xing)要(yao)求較高的(de)(de)(de)可(ke)變(bian)(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)率逆(ni)(ni)變(bian)(bian)(bian)(bian)(bian)器(qi)(qi)，要(yao)對(dui)(dui)波形(xing)進行(xing)整(zheng)理，可(ke)以輸(shu)出(chu)標準的(de)(de)(de)正弦(xian)波，叫(jiao)變(bian)(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)。一(yi)(yi)般變(bian)(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)是變(bian)(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)價(jia)格(ge)的(de)(de)(de)15－－20倍。由于(yu)(yu)變(bian)(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)設備(bei)中產生(sheng)變(bian)(bian)(bian)(bian)(bian)化的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓或頻(pin)(pin)(pin)率的(de)(de)(de)主(zhu)(zhu)要(yao)裝(zhuang)置叫(jiao)“inverter”，故(gu)該產品本(ben)身就(jiu)被(bei)命名(ming)為(wei)(wei)(wei)(wei)“inverter”，即：變(bian)(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)。

變(bian)頻不是到處可(ke)以(yi)省電(dian)(dian)，有不少場合用變(bian)頻并不一(yi)定能(neng)省電(dian)(dian)。 作(zuo)為電(dian)(dian)子電(dian)(dian)路，變(bian)頻器本身也要耗(hao)電(dian)(dian)（約額定功率的(de)(de)3-5%）。一(yi)臺1.5匹的(de)(de)空調(diao)自身耗(hao)電(dian)(dian)算下來也有20-30W,相當于一(yi)盞(zhan)長明燈. 變(bian)頻器在(zai)工頻下運行，具有節電(dian)(dian)功能(neng)，是事實。但是他的(de)(de)前(qian)提(ti)條(tiao)件是：

第一、大(da)功(gong)率并且為風機/泵類負載(zai)；

第(di)二(er)、裝置本身具有節電功能（軟(ruan)件支持）；

這是(shi)體現節(jie)電效(xiao)果(guo)的(de)三(san)個(ge)條(tiao)件(jian)。除(chu)此之外，無所謂節(jie)不(bu)節(jie)電，沒有(you)什么意義。如(ru)果(guo)不(bu)加前提(ti)條(tiao)件(jian)的(de)說變(bian)頻器(qi)工頻運行節(jie)能，就是(shi)夸大或是(shi)商業炒(chao)作。知(zhi)道了原委，你會巧妙(miao)的(de)利用他為你服務。一定要注(zhu)意使(shi)用場合和使(shi)用條(tiao)件(jian)才好(hao)正(zheng)確應用，否則就是(shi)盲從、輕信而“受騙上(shang)當(dang)”。

功率因數補償節能

無功功率(lv)不但增(zeng)加線損和設(she)備的(de)(de)發熱(re)，更主要的(de)(de)是功率(lv)因(yin)數的(de)(de)降低(di)導致電(dian)網有(you)(you)功功率(lv)的(de)(de)降低(di)，大量(liang)的(de)(de)無功電(dian)能消耗(hao)在線路(lu)當中，設(she)備使用(yong)(yong)效率(lv)低(di)下，浪費(fei)嚴重，使用(yong)(yong)變頻調速裝置(zhi)后，由于變頻器內(nei)部濾波電(dian)容的(de)(de)作(zuo)用(yong)(yong)，從(cong)而減(jian)少(shao)了(le)無功損耗(hao)，增(zeng)加了(le)電(dian)網的(de)(de)有(you)(you)功功率(lv)。

軟啟動節能

1：電(dian)(dian)機(ji)硬啟動(dong)對電(dian)(dian)網(wang)造成嚴重的(de)沖擊(ji)，而且還會(hui)對電(dian)(dian)網(wang)容量要求(qiu)過高，啟動(dong)時產生(sheng)的(de)大電(dian)(dian)流(liu)(liu)和(he)(he)震動(dong)時對擋板和(he)(he)閥門(men)的(de)損害極大，對設(she)備、管路的(de)使用(yong)(yong)壽(shou)(shou)命極為不利。而使用(yong)(yong)變(bian)(bian)頻節(jie)能(neng)裝置后，利用(yong)(yong)變(bian)(bian)頻器的(de)軟啟動(dong)功能(neng)將使啟動(dong)電(dian)(dian)流(liu)(liu)從零開(kai)始，最大值(zhi)也不超過額定(ding)電(dian)(dian)流(liu)(liu)，減輕了(le)對電(dian)(dian)網(wang)的(de)沖擊(ji)和(he)(he)對供電(dian)(dian)容量的(de)要求(qiu)，延長(chang)了(le)設(she)備和(he)(he)閥門(men)的(de)使用(yong)(yong)壽(shou)(shou)命。節(jie)省(sheng)了(le)設(she)備的(de)維護費用(yong)(yong)。

2：從理論上講，變頻器(qi)可(ke)以(yi)用在(zai)(zai)(zai)所(suo)有(you)帶有(you)電(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)的(de)(de)(de)機(ji)(ji)(ji)械設(she)備中，電(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)在(zai)(zai)(zai)啟(qi)動(dong)時，電(dian)(dian)(dian)流會(hui)比(bi)額定高5-6倍(bei)的(de)(de)(de)，不但會(hui)影(ying)響電(dian)(dian)(dian)機(ji)(ji)(ji)的(de)(de)(de)使用壽命而(er)且消耗較(jiao)多(duo)的(de)(de)(de)電(dian)(dian)(dian)量.系統在(zai)(zai)(zai)設(she)計時在(zai)(zai)(zai)電(dian)(dian)(dian)機(ji)(ji)(ji)選(xuan)型上會(hui)留有(you)一定的(de)(de)(de)余量，電(dian)(dian)(dian)機(ji)(ji)(ji)的(de)(de)(de)速(su)度是(shi)固定不變，但在(zai)(zai)(zai)實際使用過程(cheng)中，有(you)時要以(yi)較(jiao)低或者較(jiao)高的(de)(de)(de)速(su)度運行(xing)，因此(ci)進行(xing)變頻改(gai)造(zao)是(shi)非常有(you)必(bi)要的(de)(de)(de)。變頻器(qi)可(ke)實現電(dian)(dian)(dian)機(ji)(ji)(ji)軟啟(qi)動(dong)、補(bu)償功率因素(su)