초록 ▼

Embodiments described herein relate to devices and methods for determining a magnetic field distribution of a magnet along a main surface of said magnet. An example device for determining a magnetic field distribution of a magnet along a main surface of said magnet includes an arrangement of at leas

Embodiments described herein relate to devices and methods for determining a magnetic field distribution of a magnet along a main surface of said magnet. An example device for determining a magnetic field distribution of a magnet along a main surface of said magnet includes an arrangement of at least two independent magnetic field camera modules being arranged in a fixed relative position with respect to each other, each magnetic field camera module being adapted for measuring a magnetic field distribution to which it is exposed by means of a respective detection surface. The device also includes a means for providing a predetermined relative movement between the main surface and the arrangement to thereby scan the magnetic field distribution of the magnet along the main surface.

대표청구항 ▼

1. A device for determining magnetic field, the device comprising: two or more independent magnetic field image sensors arranged in a fixed relative position with respect to each other, wherein each magnetic field image sensor measures a magnetic field distribution along a main surface of a magnet;

1. A device for determining magnetic field, the device comprising: two or more independent magnetic field image sensors arranged in a fixed relative position with respect to each other, wherein each magnetic field image sensor measures a magnetic field distribution along a main surface of a magnet; anda scanning stage configured to provide a predetermined relative movement between the main surface of the magnet and the two or more independent magnetic field image sensors, thereby scanning the magnetic field distribution along the main surface of the magnet. 2. The device according to claim 1, wherein the two or more independent magnetic field image sensors are arranged such that detection surfaces of each of the two or more independent magnetic field image sensors lie within a single plane. 3. The device according to claim 2, wherein the detection surfaces of each of the two or more independent magnetic field image sensors are arranged and aligned along a single line. 4. The device according to claim 2, wherein the detection surfaces of each of the two or more independent magnetic field image sensors are arranged and aligned along two parallel lines, such that an orthogonal projection of the detection surfaces on a virtual line parallel to the two parallel lines provides a single, uninterrupted portion of the virtual line. 5. The device according to claim 3, wherein the scanning stage is configured to provide one or more relative translational movements between the two or more independent magnetic field image sensors and the main surface of the magnet, andwherein the detection surfaces and the main surface of the magnet are maintained parallel during the one or more relative translational movements. 6. The device according to claim 5, wherein at least one of the one or more relative translational movements between the two or more independent magnetic field image sensors and the main surface of the magnet bridges a previously existing dead zone between at least two predetermined detection surfaces. 7. The device according to claim 3, wherein the scanning stage is configured to provide a relative rotational movement between the two or more independent magnetic field image sensors or the main surface of the magnet around a rotation axis. 8. The device according to claim 1, wherein a first subset of the two or more independent magnetic field image sensors is arranged such that their detection surfaces lie within a first plane, andwherein a disjoint second subset of the two or more independent magnetic field image sensors is arranged such that their detection surfaces lie within a second plane, andwherein the second plane is different from the first plane. 9. The device according to claim 8, wherein the detection surfaces of the first subset are arranged and aligned along a first line,wherein the detection surfaces of the second subset are arranged and aligned along a second line, andwherein the first line and the second line are parallel. 10. The device according to claim 9, wherein the first plane and the second plane are parallel. 11. The device according to claim 9, wherein the first plane and the second plane form an angle different from 0° or 180°. 12. The device according to claim 9, wherein an orthogonal projection of the detection surfaces of the first subset and the detection surfaces of the second subset on a virtual line parallel to the first line and the second line covers a single, uninterrupted portion of the virtual line. 13. The device according to claim 8, wherein the scanning stage is configured to provide a relative rotational movement between the two or more independent magnetic field image sensors or the main surface of the magnet around a rotation axis. 14. The device according to claim 8, wherein the first plane and the second plane are arranged such that, when the scanning stage provides the predetermined relative movement between the main surface of the magnet and the two or more independent magnetic field image sensors, at least a portion of the main surface of the magnet is scanned by a magnetic field image sensor of the first subset and by a magnetic field image sensor of the second subset at different distances from the main surface of the magnet. 15. A method for determining magnetic field, the method comprising: providing a magnet;providing two or more independent magnetic field image sensors arranged in a fixed relative position with respect to each other, wherein each magnetic field image sensor measures a magnetic field distribution along a main surface of the magnet; andproviding a predetermined relative movement between the main surface of the magnet and the two or more independent magnetic field image sensors, thereby scanning the magnetic field distribution along the main surface of the magnet. 16. The device according to claim 1, wherein the magnet is a permanent magnet. 17. The device according to claim 1, wherein the predetermined relative movement is of a distance smaller a size of any of the two or more independent magnetic field image sensors, thereby providing an overlap region between images recorded by each of the two or more independent magnetic field image sensors. 18. The device according to claim 1, wherein the magnet is mounted on a rotor. 19. The device according to claim 18, wherein measuring the magnetic field distribution along the main surface of the magnet comprises measuring a radial component of the magnetic field distribution over 360° around the rotor and along a full axial length of the rotor. 20. The device according to claim 19, wherein at least one of the two or more independent magnetic field image sensors comprises a Hall sensor surface, perpendicular to a radial direction of the rotor, that measures the radial component of the magnetic field distribution.