Control means for a direct current motor

1. Control means of at least one direct current motor (2), comprising a transducer (6) delivering signals representative of the angle of rotation of the rotor of said motor, said signals measuring the effective angular position (alpha) of said rotor, a generator of nominal value signals (15-19) delivering signals defining a nominal value of an angular position (beta) of said rotor, said effective position signals (Xr, Yr) and said nominal value position signals (Xc, Yc) being formed each of two signals mutually phase-shifted by a determined angle, each of said phase-shifted signals being a sinusoidal function of the angle (alpha) of the effective position, respectively of the angle (beta) of nominal value position of said rotor and means (11) delivering from said signals of effective position and of nominal value position an error signal (d) representative of the angular difference (epsilon) between the effective position and the nominal value position of the rotor, said control means controlling a displacement of said rotor such as to cancel out said error signal, characterized in that said generator of nominal value signals comprises addressing means (15) generating address signals for two storage units (16, 17) of nominal value which deliver said nominal value signals (Xc, Yc) in response to said address signals, said error signal delivering means (11) receiving said mutually phase-shifted signals and delivering said error signal (d) which is depending on said angular difference (epsilon). Le dispositif utilise un capteur incrémental (6) délivrant des signaux sinusoidaux (Xr, Yr) déphasés entre aux de 90° et fonction de la position angulaire du rotor du moteur (2) par rapport à une position de référence. Un générateur de position de consigne délivre des signaux sinusoidaux (Xc, Yc) déphasés entre eux de 90° définissant une position de consigne. Un calculateur (11) délivre un signal d'erreur à partir des signaux de position et de consigne. L'asservissement rend le signal d'erreur aussi petit que possible pour asservir la position du rotor à la position de consigne.