Patent ID: 8729994

Claim:
A rotary solenoid comprising a stator and a rotor rotatable around a rotational axis, wherein the rotor has a rotor shaft on which at least one rotor disc is arranged, and the rotor disc is magnetically polarized alternating in a circumferential direction, and the stator receives at least one coil that carries windings of electrically conducting wire, and the windings encircle the rotational axis, wherein the at least one coil is positioned coaxially with respect to the rotational axis, and between the at least one coil and the rotor disc a pole face that is arranged perpendicular to the rotational axis is provided that consists of at least two partial pole faces serving for the conduction of magnetic flux of a magnetic field generated by current applied to the windings of the at least one coil, so that on the pole face, with respect to the rotational axis seen in the circumferential direction, alternating magnetic polarization exists, and further wherein the rotor disc has a side facing away from the at least one coil, and a magnetically low effective or magnetically ineffective cover disc is provided, and the cover disc is movably connected to the rotor disc on the side facing away from the at least one coil.