Patent ID: 6948383

Claim:
A In a device for the contact-free measurement of the rotary movement of components moving relative to one another with comprising: (a) an asymmetrically built stator unit comprising two partial stator elements that leave empty two spacing openings between them, (b) at least one Hall unit is located in at least one spacing opening, (c) the partial stator elements forming a partial ring comprising a large partial stator element and a small partial stator element, wherein the large partial stator element covers a range of more than 180° and the small partial stator element a range of less than 180° of a circular arc of said ring, and (d) a rotor unit comprising a magnet element that is supported by a magnet support element and that can be moved relative to the stator elements while maintaining an air gap, wherein the magnet element consists of two magnetically bipolar magnet segment elements that are at least partially arranged in a first part made of a magnetically non-conducting material, the improvement wherein (1) the two spacing openings between the large partial stator element and the small partial stator element extend along a tangent of an imagined circle around the center of the ring, (2) the large and the small partial stator elements are at least partially molded into a second part that is made of a magnetically non-conducting material, and (3) the magnet element comprises two essentially equally long magnetically bi-polar partial magnet segment elements that each cover a range of 90° or more, wherein the partial magnet segment elements are at least partially molded into the first part.