ROTATIONAL CONTROL DEVICE

摘要

PCT No. PCT/DE91/00903 Sec. 371 Date Aug. 5, 1992 Sec. 102(e) Date Aug. 5, 1992 PCT Filed Nov. 16, 1991 PCT Pub. No. WO92/10664 PCT Pub. Date Jun. 25, 1992.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.