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Magnetic position sensor

A sensor and magnetic technology, applied in the field of magnetic position sensors, can solve the problems of increasing the amount of permanent magnets and high overall prices

Inactive Publication Date: 2013-12-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned conventional magnetic position sensor, since a cylindrical permanent magnet is used to allow the support to rotate around the axis, the amount of permanent magnets used increases, and the overall price is high.

Method used

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Experimental program
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Embodiment approach 1

[0017] figure 1 is a cross-sectional view along the axis of the magnetic position sensor according to Embodiment 1 of the present invention, figure 2 is along figure 1 Sectional view of line II-II. In the figure, the housing 1 has a cylindrical portion 1a, and first and second disc portions 1b, 1c provided at both ends in the axial direction of the cylindrical portion 1a. Shaft support holes 1d, 1e are respectively provided at the centers of the disc portions 1b, 1c.

[0018] A movable shaft 2 having a circular cross section that is displaced according to the displacement of a measurement object (not shown) passes through the shaft support holes 1d and 1e. The movable shaft 2 is supported by the disk portions 1b, 1c in a state where it can slide in the axial direction and can rotate around the axis.

[0019] Cylindrical first and second detection-side cores 3 and 4 (stator cores) made of a ferromagnetic material such as iron are fixed to the inner peripheral surface of ...

Embodiment approach 2

[0038] under, Figure 5 is a cross-sectional view along the axis of the magnetic position sensor according to Embodiment 2 of the present invention, Figure 6 is along Figure 5 A sectional view of line VI-VI, Figure 7 is showing Figure 6 A cross-sectional view of the magnet unit rotated 45° around its axis.

[0039] In the figure, the first to third magnetic detection elements 5, 6, and 15 are provided within the detection gap g1. The first to third magnetic detection elements 5 , 6 , and 15 are arranged on the same circumference at equal intervals from each other in the circumferential direction of the first and second detection-side cores 3 , 4 . That is, the first to third magnetic detection elements 5 , 6 , and 15 are arranged shifted by 120° in the circumferential direction of the first and second detection-side cores 3 , 4 . First to third element insertion holes 1f, 1g, and 1h into which first to third magnetic detection elements 5, 6, and 15 are inserted are pr...

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Abstract

In a magnetic position sensor, a detecting unit has tubular first and second detecting cores, and a plurality of magnetic detecting elements. The first and second detecting cores are disposed so as to line up axially on opposite sides of a detecting gap. The magnetic detecting elements are disposed in the detecting gap so as to be spaced apart from each other in a circumferential direction of the first and second detecting cores. A magnet unit has a magnet core, and a block-shaped permanent magnet that is coupled to the magnet core. The magnet unit is disposed inside the detecting unit so as to be relatively displaceable axially and rotatable around an axis relative to the detecting unit together with displacement of a measured object.

Description

technical field [0001] The present invention relates to a magnetic position sensor that detects the position of an object to be measured using a magnetic detection element. Background technique [0002] In conventional magnetic position sensors, a cylindrical ferromagnetic stator is superimposed via a non-magnetic ring. A magnetic detection element is arranged in the air gap formed by the nonmagnetic ring. The ferromagnetic stator is surrounded by cylindrical pillars. A cylindrical permanent magnet that generates two magnetic flux loops with the center as a branch point is fixed to the support. The strut can be displaced in the axial direction with respect to the ferromagnetic stator, and can rotate about the axis (for example, refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent No. 3264929 ( image 3 ) [0004] In the conventional magnetic position sensor described above, since a cylindrical permanent magnet is used to allow the support to rotate ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/14G01B7/00
CPCG01B7/003G01B7/30G01D5/145G01D2205/40
Inventor 木村康树西浦竜一古泽公康山代谕户谷光利
Owner MITSUBISHI ELECTRIC CORP