A20B-1006-0300/04C, NO BASE

1E-24P

A20B-1006-0300/04C, NO BASE

A06B-6058-H011

變頻器是把電壓和頻率固定不變的交流電變換為電壓或頻率可變的交流電的裝置，在實際的生產(chǎn)中有著十分廣泛的應(yīng)用。那么變頻器的工作原理是什么呢？下面電工之家?guī)黄饋矸窒硪幌隆?

　　它的主電路由三部分構(gòu)成，即整流器、平波回路和逆變器，并一般分為電流型和電壓型。電壓型是將電壓源的直流變換為交流的變頻器，直流回路的濾波是電容。電流型是將電流源的直流變換為交流的變頻器，其直流回路濾波是電感。它由三部分構(gòu)成，將工頻電源變換為直流功率的“整流器”，吸收在變流器和逆變器產(chǎn)生的電壓脈動的“平波回路”，以及將直流功率變換為交流功率的“逆變器”。

　　整流器

　　近大量使用的是二極管的變流器，它把工頻電源變換為直流電源。也可用兩組晶體管變流器構(gòu)成可逆變流器，由于其功率方向可逆，可以進(jìn)行再生運轉(zhuǎn)。

　　平波回路

　　在整流器整流后的直流電壓中，含有電源6倍頻率的脈動電壓，此外逆變器產(chǎn)生的脈動電流也使直流電壓變動。為了抑制電壓波動，采用電感和電容吸收脈動電壓（電流）。裝置容量小時，如果電源和主電路構(gòu)成器件有余量，可以省去電感采用簡單的平波回路。

　　逆變器

　　同整流器相反，逆變器是將直流功率變換為所要求頻率的交流功率，以所確定的時間使6個開關(guān)器件導(dǎo)通、關(guān)斷就可以得到3相交流輸出。以電壓型pwm逆變器為例示出開關(guān)時間和電壓波形。

　　控制電路

　　是給異步電動機供電（電壓、頻率可調(diào)）的主電路提供控制信號的回路，它有頻率、電壓的“運算電路”，主電路的“電壓、電流檢測電路”，電動機的“速度檢測電路”，將運算電路的控制信號進(jìn)行放大的“驅(qū)動電路”，以及逆變器和電動機的“保護(hù)電路”組成。

Fu Zhou ZhuoKai ?Electric Co., Ltd.

福州卓凱電子科技有限公司

【誠信】 【質(zhì)量保證】? 【價格優(yōu)惠】? ?

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我公司大量現(xiàn)貨歐姆龍，倍加福，橫河川儀，abb,施耐德等國外多家品牌，產(chǎn)品涉及變頻器，儀器儀表，變送器，可編程控制器plc和人機界面，工控機及氣動閥門等。

聯(lián)系人【王工】???????????????????

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