A brushless electrical power generating system (100) in accordance with the invention includes an exciter (14) for producing alternating current from an exciter rotor; a rectifier (20) mounted for rotation with the exciter rotor for producing a rectified control current from the AC current; a common mode inductor (112), coupled to the control current, for cancelling common mode noise components within the rectified control current; and a main generator (22), having a rotating field winding (24) mounted on a main generator rotor excited by the control current and producing an alternating current power output from a stator.
A voltage regulator for a generator drivable by an internal combustion engine is proposed, in which the triggering of the end stage transistor for varying the exciter current is done with the aid of a pulse width modulator. The digital pulse width modulator employed is a component of a closed-loop control circuit for the exciter current, which uses the generator voltage as the actual value and regulates the pulse width ratio duty factor as a function of the generator voltage detected, and in addition a system damping is performed, in that one entire period of the duty factor can be turned off in overriding fashion. This overridingly turned-off period can be adapted in its duration to the duty factor, thus resulting in a voltage change that is independent of the duty factor. The maximum current rise rate can thus be limited by limiting the maximum rate of change of the pulse width modulator.
A slowly rotating synchronous generator (ring generator) for a wind power installation, the generator having a rotor and a stator surrounding the rotor, and the stator having at least one three-phase current winding on which a capacitive current is impressed, and the generator having a part of the exciter power of the generator produced by the stator.
