Linear or rotary position sensor with a permanent magnet for detecting a ferromagnetic target
First Claim
1. A contactless magnetic sensor capable of measuring angular or linear movement of at least one mobile ferromagnetic target, the magnetic sensor comprising at least one permanent magnet, at least one ferromagnetic member and at least one magnetically sensitive member, the permanent magnet having an upper surface opposing the ferromagnetic target, the permanent magnet including a shape that is one of:
- substantially cylindrical and parallelepiped, and further including a cavity, the ferromagnetic member being arranged inside the cavity and the magnetically sensitive member being arranged inside the cavity above the ferromagnetic member and below the upper surface of the permanent magnet.
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Accused Products
Abstract
The disclosure relates to a contactless magnetic sensor for measuring the angular or linear movement of a ferromagnetic target. The purpose of the disclosure is to make a position sensor having reduced dimensions and capable of detecting a piece of position information as soon as the sensor is powered without degrading the performance thereof. To this end, the disclosure relates to a mobile sensor that includes at least one permanent magnet, at least one ferromagnetic member at least one magnetically sensitive member, the permanent magnet having an upper surface opposite the ferromagnetic target, wherein the permanent magnet has a substantially cylindrical or parallelepiped shape and includes a cavity, the ferromagnetic member being arranged inside the cavity and the magnetically sensitive member being arranged inside the cavity above the ferromagnetic member and below the upper surface of the magnet.
127 Citations
27 Claims
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1. A contactless magnetic sensor capable of measuring angular or linear movement of at least one mobile ferromagnetic target, the magnetic sensor comprising at least one permanent magnet, at least one ferromagnetic member and at least one magnetically sensitive member, the permanent magnet having an upper surface opposing the ferromagnetic target, the permanent magnet including a shape that is one of:
- substantially cylindrical and parallelepiped, and further including a cavity, the ferromagnetic member being arranged inside the cavity and the magnetically sensitive member being arranged inside the cavity above the ferromagnetic member and below the upper surface of the permanent magnet.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 21, 22, 23)
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15. A contactless magnetic sensor capable of measuring angular or linear movement of at least one mobile ferromagnetic target, the magnetic sensor comprising:
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at least one permanent magnet; at least one ferromagnetic member; at least one magnetically sensitive member; the permanent magnet having an upper surface opposing the ferromagnetic target; the permanent magnet including a shape that is one of;
substantially cylindrical and parallelepiped and further including a cavity;the ferromagnetic member having one of;
a truncated conical shape and a trapezoid based-cylindrical shape;the ferromagnetic member being arranged inside the cavity; and the magnetically sensitive member being arranged inside the cavity above the ferromagnetic member and below the upper surface of the permanent magnet. - View Dependent Claims (16, 17, 24, 25, 26)
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18. A magnetic sensor comprising:
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a permanent magnet having a base and pair of protrusions, the pair of protrusions extending from the base and terminating at a distal surface of the permanent magnet; a cavity defined by the permanent magnet between the pair of protrusions that is bounded by the pair of protrusions and the base and that is open at the distal surface of the permanent magnet; a ferromagnetic member disposed within the cavity adjacent the base and between the pair of protrusions; and a magnetically sensitive member disposed within the cavity between the pair of protrusions and between the ferromagnetic member and the distal surface such that the magnetically sensitive member is inward of the distal surface of the permanent magnet. - View Dependent Claims (19, 20, 27)
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Specification