CPC G01R 33/383 (2013.01) [G01R 33/3873 (2013.01); G01R 33/421 (2013.01); G01R 33/56563 (2013.01); H01F 7/0273 (2013.01); H01F 7/0278 (2013.01)] | 30 Claims |
1. A magnetic field device, comprising:
a first magnet;
a first ferromagnetic element positioned adjacent to the first magnet;
a second magnet;
a second ferromagnetic element positioned adjacent to the second magnet and relative to the first ferromagnetic element to create a gap between the first ferromagnetic element and the second ferromagnetic element; and
a third magnet positioned at least partially between the first ferromagnetic element and the second ferromagnetic element and at least partially within the gap; and
a fourth magnet positioned around the first magnet,
wherein:
a first axis of the magnetic field device is defined as passing through the first magnet, the first ferromagnetic element, the second ferromagnetic element and the second magnet, and a second axis of the magnetic field device is perpendicular to the first axis,
each of the first, second and third magnets have a magnetization direction that is parallel to the first axis, the first magnet and the second magnet have the same magnetization direction, and the third magnet has a magnetization direction that is opposite the magnetization direction of the first and second magnets, and
the fourth magnet has a magnetization direction that is parallel to the second axis.
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