Patent ID: 8907753
Filing Date: 2014-12-09
Classification: H01F,H02K

Abstract:
1. Rotary solenoid, comprising: a stator and a rotor that can rotate around a rotational axis, wherein the rotor has a rotor shaft on which a rotor disc is arranged, and the rotor disc has, seen in the direction of the circumference, alternating magnetically polarized magnetic poles, and the stator receives at least one coil carrying windings of wire conducting electric current, and the windings encircle the rotational axis, and between the coil and the rotor disc a pole face is provided consisting at least of two partial pole faces, including a first partial pole face and a second partial pole face, serving for guiding the magnetic flux of the magnetic field generated by applying current to the windings of the coil, whereby there is at the pole face a magnetic polarization alternating with reference to the rotational axis seen in the direction of the circumference, and between the rotor disc and the pole face an air gap is provided, wherein the magnetic poles of the rotor disc, the air gap and the partial pole faces of the pole face form elements of the magnetic system of the rotary solenoid, and at least one element of the magnetic system is configured along the direction of the circumference, depending on a rotational angle of the rotor around the rotational axis changeably in such a way that during switching-off the current through the windings of the coil a torque results resetting the rotor in the starting position, wherein each partial pole face has an inside and/or outside arranged boundary edge running in the direction of the circumference, the boundary edge describing a circle segment with a course of the boundary edge where, depending on the rotational axis, the distance of a point on the boundary edge from the rotational axis has each time a distance changing depending on the rotational angle.