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Rotation detecting device

A technology of rotation detection and magnetic detection components, which is applied in the direction of measuring devices, measuring magnetic variables, converting sensor output, etc., to achieve the effect of expanding the dynamic range

Inactive Publication Date: 2017-10-13
メレキシステクノロジーズエスエー
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the case of the above-mentioned sensor IC, the distance between a pair of magnetic detection elements is 2.2 mm, and the arrangement of a pair of magnetic detection elements is limited. Therefore, there is a problem that the sensor IC cannot be manufactured at least smaller than this distance.

Method used

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no. 1 Embodiment approach

[0038] (Configuration of rotation detection device)

[0039] figure 1 It is a side view showing a configuration example of the rotation detection device according to the first embodiment. Figure 2A and Figure 2B It is a perspective view and a cross-sectional view showing the structure of the sensor 1 .

[0040] The rotation detection device 5 has an air gap d provided from the tooth tip 3h of the gear 3 g and configured sensor 1; and set the magnetization direction to D m The magnet 2 arranged on the back side of the sensor 1.

[0041] sensor 1 as Figure 2A and Figure 2B As shown, as an example, there are: a plate-shaped substrate 10 having a thickness in the z direction; a Hall sensor as a magnetic detection element that is provided on the substrate 10 and has a detection surface parallel to the xy plane, and sets the detection direction to the z direction. Element 11 x1 、11 x2 、11 y1 、11 y2 ; in hall element 11 x1 、11 x2 、11 y1 、11 y2 The Hall element 11 i...

no. 2 Embodiment approach

[0065] The second embodiment differs from the first embodiment in that a sensor 1a in which the arrangement of the magnetic detection element and the magnetic concentrator is changed is used instead of the sensor 1 of the first embodiment. In addition, in the following, the same code|symbol is used about the structure common to 1st Embodiment.

[0066] Figure 6A and Figure 6B It is a perspective view and a sectional view which show the structural example of the sensor of the rotation detection apparatus of 2nd Embodiment.

[0067] Sensor 1a as Figure 6A and Figure 6B As shown, as an example, there are Hall elements 111, 112, 113 as magnetic detection elements having a plate shape having a thickness in the z direction, having a detection surface parallel to the xy plane, and setting the detection direction to the z direction. 114; a magnetic concentrator 12a that is partially overlapped on the Hall elements 111, 113 and converts the magnetic flux in the x direction into...

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Abstract

[Problem] To provide a rotation detecting device that has a miniaturized sensor IC in comparison with the prior art. [Solution] A rotation detecting device 5 has a magnet 2 that forms a magnetic field toward the tooth surface of a gear 3, and a sensor 1 for detecting a variation in the magnetic flux density accompanying the rotation of the gear 3, the sensor 1 being provided with: at least a pair of magnetic detection elements 11x1 and 11x2 arranged between the gear 3 and the magnet 2 and outputting a signal in response to the magnetic flux density in the radial direction of the gear 3; and a magnetic concentrator 12 that induces, in the radial direction of the gear 3, a component in the circumferential direction of the gear 3 within the magnetic flux density on the detection surfaces of the magnetic detection elements 11x1 and 11x2.

Description

technical field [0001] The present invention relates to a rotation detection device. Background technique [0002] As a prior art, there has been proposed a rotation detection device (for example, see Non-Patent Document 1) that detects the rotation of a gear using a differential Hall sensor. [0003] The rotation detection device disclosed in Non-Patent Document 1 has: a magnet that forms a magnetic field on the tooth surface of a gear; A pair of magnetic detection elements that detect changes in magnetic flux density caused by rotation, and this sensor IC outputs the difference between the outputs of the pair of magnetic detection elements. As the gear rotates, the signal output from the sensor IC changes periodically, so that the rotational speed and angular velocity of the gear can be detected. [0004] prior art literature [0005] non-patent literature [0006] Non-Patent Document 1: Allegro Micro Systems LLC, "ATS667LSG Data Sheet", [online], [retrieved on Februar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/245
CPCG01D5/147G01D5/2451G01R33/072G01D2205/40G01D5/245
Inventor 吉谷拓海
Owner メレキシステクノロジーズエスエー