Device for compensating external magnetic stray fields or for compensating the influence of a magnetic field gradient on a magnetic field sensor
AssigneeMethode Electronics Malta Ltd.
InventorJohannes Gießibl
Life of this patent
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Abstract
A device compensates for the an influence of a magnetic field gradient which may be generated due to a component geometry of a component (1). The device includes at least two magnetic field sensors (17, 18) which are arranged outside of the magnetic balance of the ferromagnetic component (1). The at least two magnetic field sensors (17, 18) each have a differing sensitivity. One of the magnetic field sensors (17, 18) is exposed to the influence of the magnetic field gradient to a greater extent compared to the other magnetic field sensor due to its spatial arrangement relative to the ferromagnetic component (1). The one magnetic field sensor may have a sensitivity lower than the other magnetic field sensor.
Claims20
A device for compensating an external magnetic stray field comprising:
- at least two magnetic field sensors (17, 18), one of the magnetic field sensors (17, 18) being arranged to detect a higher strength of an external magnetic field acting on a ferromagnetic component and having a sensitivity different from the other magnetic field sensor (17, 18).
A method for compensating an external magnetic stray field comprising:
- providing at least two magnetic field sensors (17, 18), one of the field sensors (17, 18) having a lower sensitivity as compared to the other of the field sensors;
- and
- arranging the magnetic field sensor with the lower sensitivity (17, 18) to detect a higher strength of the external magnetic field.
A method comprising:
- providing at least two magnetic field sensors (17, 18) configured to detect a non-symmetrical external magnetic field, one of the field sensors (17, 18) having a lower sensitivity as compared to the other of the field sensors;
- and
- arranging the magnetic field sensor with the lower sensitivity (17, 18) to detect a higher strength of the non-symmetrical external magnetic field.
Dependencies are inferred from the claim text.