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Rotational angle detecting sensor

A rotation angle detection and sensor technology, which is applied in the direction of converting sensor output, instruments, and using electric/magnetic devices to transmit sensing components, etc., can solve the problems of increasing difficulty in permanent magnet design, so as to prevent angle detection errors and avoid gap narrowing Effect

Active Publication Date: 2012-05-23
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the angle detection error, although the rotation angle detection sensor disclosed in Patent Document 2 uses a permanent magnet with one end of a permanent magnet in the shape of a frustum of a cone and a stepped permanent magnet instead of a cylindrical permanent magnet, due to special The shape makes the design of the permanent magnet more difficult

Method used

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Examples

Experimental program
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Embodiment

[0074] Figure 10 Example 1 is shown in . As shown in the figure, Example 1 includes a shaft 4, a case 6, and a circuit board 8 on which a sensor array is mounted. The housing 6 supports the shaft 4 via the bearing portion 7 . The permanent magnet 1 is fixed on one end of the shaft 4 . The other end of the shaft 4 is exposed outside the casing 6 . The casing 6 is provided to house the permanent magnet 1 and the circuit board 8 . Furthermore, the housing 6 has: a housing main body 10 on which the bearing portion 7 is provided; and a housing cover 9 having a flat portion 9 a facing one end of the shaft 4 in the axial direction.

[0075] The bearing unit 7 is composed of a pair of rolling bearings mounted in multiple rows between the shaft 4 and the housing body 10 . In addition, the bearing portion 7 is not particularly limited in kind, such as Figure 11 As an example, it may be constituted by a single-row rolling bearing, or may be constituted by a sliding bearing.

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PUM

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Abstract

A bipolar columnar permanent magnet magnetized in the radial directions thereof is used as a rotational angle detecting sensor so that angle detection error is prevented while a gap between magnetic sensors and an end face of the permanent magnet is prevented from being reduced. Specifically, a permanent magnet (1) is formed of a ferrite magnet or an alnico magnet having a diameter of 4 to 20 mm and a length of 3 to 5 mm in the axial direction, and the magnetic flux density in the radial directions is detected while a plurality of magnetic sensors (2, 3) are located at positions remote from a central portion A, having a diameter of 10% or less of that of the permanent magnet (1), of the end face of the magnet by 0.5 to 3.0 mm in the axial direction. With this, the magnetic flux density can be detected in the range where inclinations of distribution curves of the magnetic flux density in the radial directions are gentle.

Description

technical field [0001] The invention relates to a non-contact rotation angle detection sensor, which can detect the relative rotation angle between two parts by using a permanent magnet and a magnetic sensor. Background technique [0002] As such a rotation angle detection sensor, there is a rotation angle detection sensor provided with: a cylindrical permanent magnet; and a plurality of magnetic sensors axially away from one end surface of the permanent magnet The positions are arranged on the same circle. For this type of rotation angle detection sensor, among the two parts intended to detect the relative rotation angle, a permanent magnet is fixed on one part, and a plurality of magnetic sensors are fixed on the other part, and the relative concentricity of the two parts is fixed. The rotational angle of rotation is converted into a rotational magnetic field of a permanent magnet, and this type of rotational angle detection sensor further includes a processing circuit th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/14
CPCG01D5/145
Inventor 糸见正二
Owner NTN CORP