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Angle sensor and angle sensor system

An angle sensor and angle technology, which is applied in converting sensor output, using electric/magnetic devices to transmit sensor components, instruments, etc., can solve problems such as the inability to reduce the angle error of higher harmonics, and the difficulty of designing magnetoresistive effect elements.

Active Publication Date: 2018-01-05
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the technology described in Chinese Patent Application Publication No. 102384758A, there is a problem that angle errors caused by error components corresponding to higher harmonics of orders 5 or higher cannot be reduced.
[0011] In the technology described in Japanese Patent Application Publication No. Hei 5-346329, it is necessary to design a magnetoresistance effect element that changes the positions of a plurality of linear magnetoresistance effect element pieces according to the period of the scale of the magnetic scale, and there are magnetoresistance effect elements. The design is not easy to wait for the problem

Method used

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no. 1 approach

[0061] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, refer to figure 1 and figure 2A schematic configuration of the angle sensor system according to the first embodiment of the present invention will be described. The angle sensor system 1 according to the present embodiment includes the angle sensor 2 according to the present embodiment. The angle sensor 2 according to the present embodiment is particularly a magnetic angle sensor. Such as figure 1 and figure 2 As shown, the angle sensor system 1 further includes a magnetic field generator 5 that generates a rotating magnetic field MF that rotates in direction. The angle sensor 2 generates an angle detection value corresponding to an angle formed by the direction of the rotating magnetic field MF at the reference position with respect to the reference direction. Hereinafter, the angle formed by the direction of the rotating magnetic field MF at the...

no. 1 example 1

[0192] As in the first embodiment, when the first and second detection signals S1 and S2 are represented by equations (1) and (2) respectively, in the second embodiment, the third and fourth detection signals S3 and S4 can be respectively represented by the following formulas (9) and (10).

[0193] S3=cos(θ+360° / n)

[0194] +a 1 ·cos{n(θ+360° / n)}

[0195] +b 1 ·cos{m(θ+360° / n)}

[0196] =cos(θ+360° / n)

[0197] +a 1 ·cos(nθ+360°)

[0198] +b 1 ·cos{m(θ+360° / n)}

[0199] =cos(θ+360° / n)

[0200] +a 1 ·cos(nθ)

[0201] +b 1 ·cos{m(θ+360° / n)}...(9)

[0202] S4=sin(θ+360° / n)

[0203] +a 2 · sin{n(θ+360° / n)}

[0204] +b 2 · sin{m(θ+360° / n)}

[0205] =sin(θ+360° / n)

[0206] +a 2 · sin(nθ+360°)

[0207] +b 2 · sin{m(θ+360° / n)}

[0208] =sin(θ+360° / n)

[0209] +a 2 · sin(nθ)

[0210] +b 2 · sin{m(θ+360° / n)}…(10)

[0211] In addition, the fifth and sixth detection signals S5 and S6 can be represented by the following equations (11) and (12), respectively.

[...

no. 2 approach

[0317] Next, a second embodiment of the present invention will be described. First, refer to Figure 13 A schematic configuration of an angle sensor system according to this embodiment will be described. The angle sensor system 1 according to this embodiment differs from the first embodiment in the following points. The angle sensor system 1 according to the present embodiment includes a magnetic field generating unit 7 instead of the magnetic field generating unit 5 in the first embodiment. The magnetic field generator 7 in the present embodiment is a cylindrical magnet, and generates a rotating magnetic field MF whose direction is rotated. The magnetic field generator 7 rotates in the rotation direction D around the center axis C. As shown in FIG.

[0318] The magnetic field generator 7 includes first and second portions 7A, 7B whose magnetization directions are different from each other. The first and second portions 7A, 7B are arranged symmetrically about an imaginary ...

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Abstract

The invention relates to an angle sensor and an angle sensor system. The angle sensor includes a first to a fourth detection unit and an angle detection unit. Each of the first to the fourth detectionunit generates two detection signals. The first to the fourth detection unit are arranged in a positional relationship that establishes predetermined phase relationships among the detection signals they generate. The angle detection unit performs operations using the detection signals to generate a first and a second signal in which an error component corresponding to a fifth or higher-order harmonic and an error component corresponding to a harmonic of the order other than the fifth order are lower than those in the detection signals. The angle detection unit then calculates a detected anglevalue on the basis of the first and the second signal.

Description

technical field [0001] The present invention relates to an angle sensor and an angle sensor system that generate an angle detection value corresponding to an angle formed by a direction of a rotating magnetic field with respect to a reference direction. Background technique [0002] In recent years, an angle sensor that generates an angle detection value corresponding to an angle of a detection object has been widely used in various applications such as detection of the rotational position of a steering wheel of an automobile or a power steering motor. As the angle sensor, there is, for example, a magnetic angle sensor. In an angle sensor system using a magnetic angle sensor, a magnetic field generating unit that generates a rotating magnetic field whose direction is rotated in conjunction with the rotation or linear motion of an object is generally provided. The magnetic field generator is, for example, a magnet. The angle of the detection object in the magnetic angle sen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/14
CPCG01D5/145G01D5/24485G01D5/16
Inventor 内田圭祐渡部司也平林启
Owner TDK CORPARATION
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