Abstract: A torque motor (M) for the hydraulic potentiometer (P) of a servo-distributor intended in particular for the control of jacks and hydraulic motors, comprising magnets fixed to fixed members (1, 2) in which an armature (3) is arranged whose ends are separated from the fixed members (1, 2) by air-gaps (y) and around which armature are mounted two induction coils (4, 5) which are capable of being supplied with electrical current, and a blade (12) which is fixed by one of its ends to a flexion tube (9) which is connected to the armature (3) by its corresponding end. There are four parallelepipedal or cylindrical magnets (23, 24, 25, 26), which are made of a suitable alloy with a strong coercive field, one pair of which is placed at each end of the armature (3). These magnets are easier to manufacture, to machine and to fix in the motor than conventional magnets and at the same time have a much higher coercive field.

Abstract: The present invention relates to a motorized electric control device provided with a joystick (14), characterized in that it comprises two electrtic torque motors (4, 5) whose axes of rotation are at right angles to one another, two forks (9, 10) coupled at one end to the respective torque motor shafts and offset relative to said shafts, the joystick being mounted for pivoting in relation to the point of intersection of the axes of rotation of the torque motors, resilient means for returning the joystick to a vertical position, rotary potentiometers (22) whose axis of rotation is fixed to the other ends of the forks (9, 10) and whose electric outputs constitute the control outputs of the device, and an electric circuit (30) connected to the outputs of the potentiometers and to the electric inputs of the torque motors in order to produce a resistant torque opposite and proportional to the inclination of the joystick (14) in the vertical position.