EMERSON艾默生變頻器SPMD1422

變頻器按頻率變換的方法分為交-交型變頻器和交-直交型變頻器。交-交型變頻器可將工頻交流電直接轉(zhuǎn)換成頻率、電壓均可以控制的交流，故稱直接式變頻器。交直-交型變頻器則是先把工頻交流電通過整流裝置轉(zhuǎn)變成直流電，然后再把直流電變換成頻率、電壓均可以調(diào)節(jié)的交流電，故又稱為間接型變頻器

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