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主電路是給異步電動(dòng)機(jī)提供調(diào)壓調(diào)頻電源的電力變換部分，變頻器的主電路大體上可分為兩類(lèi)：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(dòng)的“平波回路

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