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Magnetic position sensor with integrated hall effect switch

A sensor and primary sensor technology, which is applied in the direction of using electric/magnetic devices to transmit sensing components, which can solve problems such as worrying about reliability and difficulty in implementing limit switches.

Active Publication Date: 2008-11-12
FISHER CONTROLS INT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Other disadvantages of existing non-contact position sensors include the need for at least two of these limit switches to sense both ends of the valve plug travel, difficulty implementing such limit switches, and concerns about their reliability

Method used

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  • Magnetic position sensor with integrated hall effect switch
  • Magnetic position sensor with integrated hall effect switch
  • Magnetic position sensor with integrated hall effect switch

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Embodiment Construction

[0040] In order to understand the advantages of the position sensors described herein, it is necessary to understand the components of a position sensor and how they function to measure displacement across a control valve. While the preferred embodiment describes displacement measurements involving control valves, those skilled in the art will recognize the relevance to other displacement measurement applications as well. Turning to the attached drawings and referring first to Figure 1A , showing the key components of this non-contact position sensor.

[0041] exist Figure 1A , the sensor 5 is arranged near the magnetic flux source 8 . As is well known, the magnetic flux source 8 generates a continuous three-dimensional flux field which completely surrounds the magnetic flux source 8 and the sensor 5 . The sensor 5 is then a device that generates an electrical signal proportional to the magnetic field 10 surrounding the sensor 5 . The detected strength of the magnetic fiel...

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Abstract

A non-contacting position sensor having primary and secondary sensors detects relative displacement between two objects. The secondary sensor may function as a limit switch detection element in a limit switch circuit, and is positioned to be in the path of magnetic flux not detected by the primary sensor. The primary sensor is positioned in a flux path between sections of a flux gathering pole. A secondary sensor is positioned in a leakage flux path outside the first sensor or may be positioned in a secondary flux path.

Description

[0001] Related application reference [0002] This disclosure claims priority to, and is entitled to benefit from, US Provisional Patent Application No. 60 / 448,785, filed February 21, 2003, of which the entire subject matter is commonly disclosed. technical field [0003] The present disclosure generally relates to an apparatus for measuring displacement or position between two objects, and more particularly, to a non-contact position sensor having a primary configurable magnetic flux source acting as a primary sensor and communicating with the primary Sensors associated with secondary sensors, these sensors are used to detect the valve stem position on the control valve. Background technique [0004] Industrial process plants use control valves in a wide variety of applications, from controlling product flow in food processing plants to maintaining fluid levels in large oil depots. Control valves, usually automatic, are used to manage product flow by acting as a variable o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/14
Inventor 科特·盖尔布莱斯理查德·J·维克勒史蒂芬·G·西博格
Owner FISHER CONTROLS INT LLC