Magnetic field sensor and method for mounting a magnet

Patent metadata

Field	Value
Publication number	US-11378381-B2
Application number	US-201816760964-A
Country	US
Kind code	B2
Filing date	Oct 2, 2018
Priority date	Nov 3, 2017
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

A magnetic field sensor has a magnet (M1) that produces a magnetic field with a magnetic field axis (f), has a magnet axis (a) and is held in a component (4) that can move about at least one axis and has a component axis (b). Also a method for mounting a magnet (M1) of a magnetic field sensor. The magnet (M1) is held in the component (4) in such a manner that the magnetic field axis (f) coincides, as closely as possible, with the component axis (b). A deviation of the magnetic field axis (f) from the magnet axis (a) is measured, and the angle of deviation (α) is corrected during the mounting of the magnet (M1) in the component (4).

First claim

The invention claimed is:

1. A magnetic field sensor with a magnet that produces a magnetic field having a magnetic field axis,
the magnet having a magnet axis, and the magnet being positioned in a receiving opening of a component that is movable about at least one axis,
the component having a component axis, and
during installation of the magnet, a position of the magnet, relative to the receiving opening of the component, being adjusted by a mounting device so that the magnetic field axis coincides with the component axis, and, thereafter, the adjusted position of the magnet, relative to the receiving opening of the component, being secured by an adhesive so as to retain the magnetic field axis coincident with the component axis.

2. The magnetic field sensor according to claim 1 , wherein the magnet is in a form of a cylindrical body and the magnet axis is a cylinder axis.

3. The magnetic field sensor according to claim 1 , wherein the magnet axis of the magnet is tilted relative to the component axis.

4. The magnetic field sensor according to claim 3 , wherein the magnetic field axis and the magnet axis form a deviation angle and the magnet axis is tilted relative to the component axis by the deviation angle.

5. The magnetic field sensor according to claim 1 , wherein the magnet axis of the magnet is arranged parallel to the component axis with an offset.

6. The magnetic field sensor according to claim 5 , wherein the magnetic field axis and the magnet axis form a deviation angle and the offset is adapted to the deviation angle.

7. The magnetic field sensor according to claim 1 , wherein the component is in a form of either a ball stud of a ball joint or a ball sleeve of a ball sleeve joint.

8. The magnetic field sensor according to claim 7 , wherein the ball joint or the ball sleeve joint has a joint housing, and a sensor element sensitive to magnetic fields is arranged in the joint housing in an area of the magnetic field of the magnet.

9. A magnetic field sensor with a magnet that produces a magnetic field having a magnetic field axis,
the magnet having a magnet axis and being held in a component that is movable about at least one axis,
the component having a component axis, and
the magnet being held in the component in such a manner that the magnetic field axis substantially coincides with the component axis,
wherein the magnet axis of the magnet coincides with the component axis and compensation bodies, consisting of a magnetically conductive material, are arranged in a circumferential area of the magnet.

10. The magnetic field sensor according to claim 9 , wherein the magnet is arranged in an annular plastic housing in which the compensation bodies are implanted.

11. The magnetic field sensor according to claim 10 , wherein an axis of the plastic housing is arranged parallel to the magnet axis and the housing has chambers for holding the compensation bodies distributed around a circumference of the housing.

12. The magnetic field sensor according to claim 9 , wherein the compensation bodies in a form of either pins or wire inserts.

13. A method for mounting a magnet of a magnetic field sensor according that produces a magnetic field having a magnetic field axis, the magnet having a magnet axis and being held in a component that is movable about at least one axis, the component having a component axis, and the magnet being held in the component in such a manner that the magnetic field axis substantially coincides with the component axis, the method comprising:
procuring a commercially available magnet,
checking the magnet for manufacture-related deviations,
measuring any deviation of the magnetic field axis from the magnet axis,
determining an angle of deviation with a sensor,
holding the magnet with a mounting device,
positioning the magnet in the component, and, at a same time, correcting the angle of deviation of the magnet with the mounting device so that the magnetic field axis coincides with the component axis, and
adhesively securing the magnet, relative to the component, in the adjusted position such that the magnetic field axis coincides with the component axis following adhesively securing the magnet to the component.

14. A device for carrying out the method according to claim 13 , the device comprising a pivoting arm with a first articulated limb and with a second limb angled relative to the first limb, which has at an end a gripping head for holding the magnet.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Stratmann Julian
• Klank Michael
• Krahn Stefan

Classifications

• G01R33/072

  Constructional adaptation of the sensor to specific applications · CPC title

• G01R33/0017

  Means for compensating offset magnetic fields or the magnetic flux to be measured; Means for generating calibration magnetic fields · CPC title

• G01B7/30 Primary

  for measuring angles or tapers; for testing the alignment of axes · CPC title

• G01D5/24442

  by mounting means · CPC title

• G01D5/145 Primary

  influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06) · CPC title