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無刷三相同步發(fā)電機的勵磁系由同軸連接的交流勵磁機發(fā)出的交流電，經(jīng)過旋轉(zhuǎn)整流器整流為直流電，再送到發(fā)電機的勵磁繞組。交流勵磁機為旋轉(zhuǎn)電樞式的三相中頻發(fā)電機，其頻率為發(fā)電機頻率的三倍左右，這樣可提高勵磁反應速度。勵磁繞組是靜止的、由自動電壓調(diào)節(jié)器AVR控制勵磁。旋轉(zhuǎn)整流器有較高的可靠性，采用三相半波橋式整流或三相全波橋式整流，牢固的固定在轉(zhuǎn)子上，并附有電流測定和故障指示裝置。
