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 ; - 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 ; - 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. <EOS>