Magnetic sensor for absolute counting of revolutions or linear distances
View Patent ↗A magnetic sensor for the absolute counting of revolutions or linear distances includes a soft magnetic loop structure, which is populated with a predeterminable number of magnetic domains and provided with GMR or TMR layer assemblies, in which at least two separate coplanar loops having predominantly straight subsegments extending in a rhombus-like arrangement with respect to each other are provided, and the at least two loops are connected to each other via a shared intersecting point, wherein directly in front of each intersecting region in which, and after which, the domains can change from one loop to the neighboring loop, these sections of the loop structure are bent away from the conductor guidance and are curved in a siphon-like manner in this region so as to be directed into the interior of the loop structure, wherein the conductors in respective siphon-like troughs intersect each other perpendicularly.
1. A magnetic sensor for ascertaining absolute revolution or displacement values for bijective determination of a predefinable number of revolutions, or partial revolutions, or displacements, to be ascertained of an element that is driven to be rotated or displaced and is connected to a magnetic system and generates an anisotropic, external magnetic field, comprising a soft magnetic loop structure, which is populated with a predeterminable number of magnetic domains and provided with GMR or TMR layer assemblies and comprises at least a first conductor loop and a second conductor loop arranged one within the other in a common plane and each predominantly comprising straight subsections arranged in a substantially rhombus-shape and connected to each other via a shared intersecting point, wherein in a region directly in front of the intersecting point, in which and after which the domains can change from one of said loops to an adjacent said loop, loops further comprise sections bent away from the straight subsections contiguous therewith and wherein the bent sections of the loops form the conductors into siphon-shape troughs directed into an interior of the loop structure, where the conductors intersect perpendicularly at the respective siphon-shaped troughs.
2. The magnetic sensor according to claim 1 , wherein the bending is at angles >45° and less than 90°.
3. The magnetic sensor according to claim 1 , wherein in a region of the conductors in which the respective siphon-shaped troughs intersect perpendicularly, length of the conductors is approximately three times width of the conductors.
4. The magnetic sensor according to claim 1 , width of each of the siphon-like troughs is between 0.5 μm and 10 μm.
5. A magnetic sensor according to claim 1 , comprising at least three of the loops which are connected to each neighboring loop via respective bent sections in the form of siphon-shaped troughs.
6. The magnetic sensor according to claim 1 , comprising more than two of said loop structures, which among each other are connected to each other via respective loop sections in the form of a siphon-shaped troughs, wherein a different number of such respective closed loop structures having mutually separated conductors for domain guidance are provided in closely neighboring positions in one plane, the loop structures not all having a same number of loops.
7. The magnetic sensor according to claim 6 , wherein the selection of number of loops in one of the closed loop structures relative to number of loops in another of the closed loop structures is coprime.
8. The magnetic sensor according claim 1 , wherein the intersections (K) are disposed opposite each other on a diagonal in a rhombus-shaped closed loop structure that contains more than two intersecting loops.
9. The magnetic sensor according to claim 2 , wherein the bending angle is less than 55°.
10. The magnetic sensor according to claim 1 , comprising at least a third conductor loop, wherein the intersection of each of the loops with an adjacent loop is diagonally across said rhombus-shape of the loop from the intersection of the adjacent loop with the next adjacent loop.