发电机依靠电压调节器控制输出电压。电压调节器检测三相输出电压，以其平均值与要求的电压值相比较。调节器从发电机内部的辅助电源取得能量，通常是与主发电机同轴的小发电机，传送DC电源给发电机转子的磁场激励线圈。线圈电流上升或下降，控制发电机定子线圈的旋转磁场或称为电动势EMF的大小。定子线圈的磁通量决定发电机的输出电压。
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