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Rotation angle detecting device

A technology of rotation angle detection and rotating magnets, applied in measuring devices, using electric/magnetic devices to transfer sensing components, converting sensor outputs, etc., can solve the problems of increased number of steps and increased manufacturing costs, and achieve the effect of reducing manufacturing costs

Inactive Publication Date: 2012-05-23
TOMEN ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to a problem of an increase in the number of steps and an increase in manufacturing cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0028] figure 1 is a side view showing the configuration of the rotation angle detection device 100 according to the first embodiment of the present invention. Figure 2A is a plan view of a quadrupole auxiliary magnet 160 as an example of a quadrupole auxiliary magnet included in the rotation angle detection device 100 . The rotation angle detection device 100 is configured to detect the rotation angle of a rotation shaft 11 of a power assist motor of, for example, an electric steering device of an automobile. A rotating magnet 12 is attached to an end of the rotating shaft 11 . The rotation angle detection element unit 13 is provided against the rotation magnet 12 in a non-contact manner. The rotation angle detection device 100 is configured by a rotation magnet 12 and a rotation angle detection element unit 13 .

[0029] The rotating magnet 12 is formed of a rectangular solid, and is a bipolar permanent magnet whose both ends in the longer direction are magnetic poles. ...

no. 2 example

[0057] Next, refer to Image 6 A rotation angle detection device according to a second embodiment of the present invention will be described. The overall configuration of the rotation angle detecting device according to the second embodiment is the same as that of the first embodiment ( figure 1 )same. However, this embodiment differs from the first embodiment in that it contains such Image 6 octopole auxiliary magnet 160a shown, instead of Figures 2A to 2E quadrupole auxiliary magnet. The eight-pole auxiliary magnet 160 a has a function of converting a rotating magnetic field of 0 to 360 degrees generated by the rotating magnet 12 into a rotating magnetic field of 0 to 90 degrees.

[0058] Since the second embodiment is otherwise identical to the first embodiment, no explanation is provided below for any identical portion.

[0059] Next, refer to Image 6 The configuration details of the eight-pole auxiliary magnet 160a are explained. The eight-pole auxiliary magnet ...

no. 3 example

[0070] Next, refer to Figure 7 A rotation angle detecting device according to a third embodiment of the present invention is explained. The overall configuration of the rotation angle detecting device according to the third embodiment is the same as that of the first embodiment ( figure 1 )same. However, this embodiment differs from the above-described embodiments in that it contains such Figure 7 The sixteen-pole auxiliary magnet 160b is shown as a multi-pole auxiliary magnet. The sixteen-pole auxiliary magnet 160b has a function of converting a rotating magnetic field of 0 to 360 degrees generated by the rotating magnet into a rotating magnetic field of 0 to 45 degrees. Since this embodiment is otherwise the same as the first embodiment, no explanation is provided below for any part that is the same.

[0071] Next, refer to Figure 7 The configuration details of the sixteen-pole auxiliary magnet 160b are explained. The sixteen-pole auxiliary magnet 160b includes a ra...

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PUM

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Abstract

The present invention aims for providing a rotation angle detecting device which achieves both the reduction of a manufacturing cost and the elimination of the influence of a reverse magnetic field. A rotating magnet 12 is attached on a rotary shaft 11 and generates a rotating magnetic field by rotating together with the rotary shaft 11. A rotation angle detecting element unit 13 includes a magnetic detecting element and a quadrupole auxiliary magnet 160. The quadrupole auxiliary magnet 160 includes plural first pole pieces 161a to 161d arranged radially. Second pole pieces 162a and 162b are inserted between the first pole pieces 161a to 161d. The second pole pieces 162a and 162b erase a reverse magnetic field directed to a reverse direction of a composite magnetic field generated by the first pole pieces 161a to 161d.

Description

technical field [0001] The present invention relates to a rotation angle detection device that detects a rotation angle of a magnet by detecting a target using a magnetic detection element. Background technique [0002] A non-contact rotation angle detection device employing a magnetic detection element used to detect the rotation angle of a detection target such as a rotating shaft is known, for example, by Patent Document 1 previously filed by the present applicant. The rotation angle detection device of Patent Document 1 includes a rotating magnet attached to a rotating target, a quadrupole auxiliary magnet mounted on a substrate at a position opposite to the rotating magnet, and a magnetic detection element mounted on the opposite side of the substrate . The quadrupole auxiliary magnet has a function of converting a rotating magnetic field of 0 to 360 degrees caused by the rotating magnet into a rotating magnetic field of 0 to 180 degrees, and thus, a rotation of 0 to 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/18
CPCG01D5/145
Inventor 栗原武雄
Owner TOMEN ELECTRONICS CORP
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