I am looking at a generator rotor. It has a rotating exciter armature, a rotating rectifier with 3 pair of diodes, and a resistor in parallel to the rotor field. I am a mechanical engineer, so this bit of electrical "voodoo" is outside my realm a bit. Can someone explain the need for the resistor? I understand general function of the rectifier, but the resistor is a finer detail that I don't understand.
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