Abstract: A rotational control device for the setting of angles in actuators, in particular of a restricting device used for determining the flow cross-section in a flow line for internal combustion engines, has an electrical setting motor with a two-pole status and a two-pole permanent magnet rotor. To obtain a robust setting motor, which is technically easy to manufacture in a compact construction, the stator poles are designed as claw poles and the stator winding is located as a toroidal coil in a ring space formed by the claw poles and a ring casing which is coaxial with these, for the magnetic return path. The stator winding is energized by a d.c. supply, with reversible current direction. The magnetic resistances in the magnetic return path and across the claw poles are calibrated such that in the event of a currentless stator winding, the permanent magnet rotor engages in the pole gaps between the claw poles.

Abstract: A control device for the control of an opening cross-sectional area of a flow duct, in particular for internal combustion engines, comprising three sub-assemblies, an actuator housing with flow channel and setting window, a rotor with a rotary valve for controlling the window opening, and a drive housing with stator and stator winding. For setting a required air gap between the rotary valve and the setting window, a control section of the rotary valve covering the setting window is designed as a cone envelope segment, and is inclined at an acute angle to the rotor axis. The window lying in a cone envelope plane is located at the same angle of inclination. By means of a spacing disk between the rotor, with the rotary valve affixed thereon, and the actuator housing, the air gap is set and fixed as required.

Abstract: In a rotary actuator (1) with rotary slide valve (3) for controlling a throttle cross-section, the sealing of the pneumatic (16) and of the electrical part (17) is to be improved. For this purpose, the shaft (11) is supported twofold, both on this side and on the other side of the rotary slide valve (3). Both roller bearings (13, 14) are located in a one-piece housing (12). As a result, the tolerance-related width of the air gap between rotary slide valve (3) and control opening (6) is reduced, on the one hand, and, on the other hand, an isolating seal between the parts (16) and (17) is formed by the bearing (13). The rotary actuator (1) is particularly suitable as idle-speed rotary actuator for internal combustion engines.

Abstract: An electromagnetic rotation control element, for an idle rotation control device for internal combustion engines, include a magnet housing with at least two magnetic poles and with a rotating armature with an even number of pole pieces that cooperate with magnetic poles, and with a restoring spring that acts on the rotating armature. For the purpose of increasing the influencing possibilities for achieving the required characterizing line of the rotation control device, each pole piece is divided into two pole piece sections, located next to each other in the axial direction and having differently formed contour lines. The one contour line has the shape of an arc of a circle, while the other contour line increasingly deviates from the one pole piece end to the other from this arc of a circle shape.

Abstract: A device for controlling a throttle cross-section of at least one control orifice in a bypass line extending around a throttle valve of an air intake pipe of an internal combustion engine, for regulating an idle speed of the internal combustion engine, and comprising a throttle member, a spring element for biasing the throttle member to an initial position thereof, and a positioning motor for moving the throttle member from its initial position against a bias force of the spring element, upon failure of the spring element and when the positioning motor is actuated, to establish a safety cross-section in the bypass line, a quantity of operating medium flowing through the safety cross-section being less than a quantity of operating medium flowing through a complete cross-section of the control orifice whereby idle operation of the internal combustion engine is insured.