Voltage generating apparatus, comprising: - a mechanically drivable, separately excited generator device; - wherein an electric output voltage of the generator device is rectifiable by means of a rectifier device; - wherein the voltage generating apparatus is regulable by means of a regulating apparatus (40, 50); - wherein a current regulating device comprises a model of an exciter winding of the generator device, a model value of the electric excitation current (i err,modell) of the generator device being ascertainable by means of the model; - wherein the current regulating device further comprises a correction element, the latter rendering the model value of the electric excitation current (i err,modell) correctable in such a way that the model value of the electric excitation current better matches an actual value (i err,ist) of the electric excitation current in a defined manner, - wherein the correction element renders the model value of the electric excitation current (i err,modell) correctable with the aid of a dead time-afflicted measured value of the electric excitation current (i err), characterized in that the correction element is designed such - that a current, dead time-afflicted measured value of the electric excitation current (i err,mess) and a delayed value of the model value of the electric excitation current (i err,modell) are compared to one another, - wherein a difference is used as a correction value for improving the model value of the electric excitation current (i err,modell), wherein an electric excitation voltage (u err) for the exciter device is generable by means of a regulating element from the corrected model value of the electric excitation current (i err,korr) and a setpoint value (i err,soll) of the electric excitation current. - a mechanically drivable, separately excited generator device; - wherein an electric output voltage of the generator device is rectifiable by means of a rectifier device; - wherein the voltage generating apparatus is regulable by means of a regulating apparatus (40, 50); - wherein a current regulating device comprises a model of an exciter winding of the generator device, a model value of the electric excitation current (i err,modell) of the generator device being ascertainable by means of the model; - wherein the current regulating device further comprises a correction element, the latter rendering the model value of the electric excitation current (i err,modell) correctable in such a way that the model value of the electric excitation current better matches an actual value (i err,ist) of the electric excitation current in a defined manner, - wherein the correction element renders the model value of the electric excitation current (i err,modell) correctable with the aid of a dead time-afflicted measured value of the electric excitation current (i err), - that a current, dead time-afflicted measured value of the electric excitation current (i err,mess) and a delayed value of the model value of the electric excitation current (i err,modell) are compared to one another, - wherein a difference is used as a correction value for improving the model value of the electric excitation current (i err,modell), wherein an electric excitation voltage (u err) for the exciter device is generable by means of a regulating element from the corrected model value of the electric excitation current (i err,korr) and a setpoint value (i err,soll) of the electric excitation current.