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Use of a ring magnet to achieve a magnetic sensor pulse train output

A ring magnet, magneto-resistive sensor technology for sensing methods and systems, ring magnets, sensors for automotive and machinery applications, anisotropic magneto-resistive sensor devices capable of solving errors, inefficient reading, failures, etc.

Inactive Publication Date: 2006-03-08
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These narrow electrode widths inhibit better magnetic influence in this sensor, sometimes leading to false or inefficient readings, which in turn can cause failure in automotive applications

Method used

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  • Use of a ring magnet to achieve a magnetic sensor pulse train output
  • Use of a ring magnet to achieve a magnetic sensor pulse train output
  • Use of a ring magnet to achieve a magnetic sensor pulse train output

Examples

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Embodiment Construction

[0018] The specific values ​​and configurations discussed in these non-limiting examples may vary and are cited merely to illustrate at least one embodiment of the invention, not to limit the scope of the invention.

[0019] figure 1 A schematic diagram of a ring magnet 100 is shown, which may be used in accordance with a preferred embodiment of the present invention. exist figure 1 In , a top view 101 and a side view 103 of a ring magnet 100 are depicted. Ring magnet 100 may be configured to include a central portion 106 in the form of an air gap surrounded by magnet 102 in the form of a ring or other circle. figure 1 The ring magnet 100 depicted in may be configured as an axially magnetized ring magnet. The sensor 104, which is positioned proximate to the ring magnet 102, senses the ring magnet axially. Sensor 104 may be configured in the form of an anisotropic magnetoresistive (AMR) sensing device.

[0020] figure 2 A schematic diagram of a ring magnet 200 is depicte...

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PUM

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Abstract

Methods and systems of utilizing a ring magnet for magnetic sensing applications thereof are disclosed. A magnetoresistive sensor device can be provided which is associated with a ring magnet configured as a sensing target. The magnetoresistive sensor device is insensitive to magnetic pole polarities. The ring magnet is generally magnetized to include a plurality of magnetic poles, such that at least one pole thereof is larger than at least one other pole thereof. An output signal can then be produced from the magnetoresistive sensor device via a digital circuit thereof. The output signal is independent of a rotation of the sensing target. The sensor itself is rotationally insensitive provided that the ring magnet is symmetrically magnetized.

Description

technical field [0001] The present invention relates generally to magnetically sensitive sensors. The present invention also relates generally to sensing methods and systems. Furthermore, the invention also relates to sensors used in automotive and mechanical applications. The invention also relates to an anisotropic magnetoresistive (AMR) sensor device. The invention also relates to ring magnets for use in magnetic sensing applications. Background technique [0002] There are various sensors in the existing magnetic effect sensing technology. Examples of common magnetic effect sensors include, for example, magnetoresistive and Hall effect technologies. Such magnetic sensors may generally respond to changes in the magnetic field as the sensing field passes through the magnetic effect sensor due to the presence or absence of a ferromagnetic target object of designed shape. The sensor would then provide an electrical output, which could be further modified as required by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/09
CPCG01R33/09
Inventor C·B·约翰逊T·J·奥尔森
Owner HONEYWELL INT INC