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Rotation angle detection device

A technology of rotation angle detection and rotation angle, which is applied in the direction of measuring device, using electric device, using electric/magnetic device to transmit sensing components, etc., to achieve the effect of equal magnetic collection effect, uniform spatial distribution, and improved removal accuracy.

Active Publication Date: 2016-02-03
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally, when converting the waveform of the magnetic flux density into the detection signal (MR waveform) of the MR element, harmonic distortion is inevitably superimposed on the MR waveform.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024] use figure 1 and figure 2 , the rotation angle detection device 30 according to Embodiment 1 will be described. figure 1 It is a diagram showing a schematic configuration of the rotation angle detection device 30 according to the first embodiment. figure 2 It is a figure which shows the structure of the magnetic sensor 10 in Embodiment 1.

[0025] Rotation angle detecting device 30 such as figure 1 As shown, the rotation angle of the rotary drum 1 is detected. The rotary drum 1 has a multipole magnetic pattern 3 and a magnetic pattern 4 on its outer periphery, respectively. In the multi-pole magnetic pattern 3 , N poles and S poles are formed by alternately repeating magnetization at a magnetization pitch λ. The magnetic pattern 4 is magnetized at one position and is used to indicate the origin of the rotary drum 1 in the circumferential direction.

[0026] The rotation angle detection device 30 has a magnetic sensor 10 and a rotation angle calculation unit 20 ....

Embodiment approach 2

[0110] Next, the rotation angle detection device 30i according to Embodiment 2 will be described. Hereinafter, description will be given centering on parts different from Embodiment 1. FIG.

[0111] Rotation angle detection device 30i is different from Embodiment 1 in the configuration within the common pattern of A-phase detection track 12i and B-phase detection track 13i. That is, if Figure 5 As shown, the common pattern also has a dummy device group D3i and a dummy device group D4i. Figure 5 It is a figure which shows the structure in the common pattern of A phase detection track 12i and B phase detection track 13i.

[0112] The dummy element group D3i is arranged on both outer sides of the detection element group MR1. The dummy element group D3i has a plurality of dummy magnetoresistive elements (plurality of third dummy magnetoresistive elements) D31i, D32i. The respective dummy magnetoresistive elements D31i and D32i have the same shape and size as the respective m...

Embodiment approach 3

[0125] Next, a rotation angle detection device 30j according to Embodiment 3 will be described. Hereinafter, description will be given centering on parts different from Embodiment 1. FIG.

[0126] Rotation angle detection device 30j is different from Embodiment 1 in the configuration within the common pattern of A-phase detection track 12j and B-phase detection track 13j. That is, if Figure 6 As shown, the common pattern also has a dummy element group D5j. Figure 6 It is a figure which shows the structure in the common pattern of A phase detection track 12j and B phase detection track 13j.

[0127] The dummy element group D5j is arranged between the detection element group MR1 and the detection element group MR2. The dummy element group D5j has a plurality of dummy magnetoresistive elements (plurality of fourth dummy magnetoresistive elements) D51j to D55j. The dummy magnetoresistive elements D51j to D55j have the same shape and size as the magnetoresistive elements MR11...

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Abstract

The rotation angle detection device is used to detect the rotation angle of a rotating drum having a multi-pole magnetic pattern with a magnetization pitch of λ on the outer periphery, and has a detection track for detecting the multi-pole magnetic pattern, and the detection track has: 1. A detecting element group, which is disposed between a first reference potential and an output terminal, has a plurality of first magnetoresistive elements, and has a plurality of higher harmonics superimposed on a fundamental wave component of a detection signal of the multipolar magnetic pattern. When the order of the higher harmonic component to be removed in the wave component is set to n, the plurality of first magnetoresistive elements are arranged at intervals of λ / (2n); the second detection element group is arranged between the output terminal and Between the second reference potentials, there are a plurality of second magnetoresistive elements arranged at intervals of λ / (2n); a plurality of first dummy magnetoresistance elements arranged between the plurality of first magnetoresistance elements; and a plurality of second dummy magnetoresistive elements, which are disposed between the plurality of second magnetoresistive elements, and among the plurality of first magnetoresistive elements and the plurality of first dummy magnetoresistive elements adjacent to each other The intervals between the magnetoresistive elements are equal to each other, and the intervals between adjacent magnetoresistive elements among the plurality of second magnetoresistive elements and the plurality of second dummy magnetoresistive elements are equal to each other.

Description

technical field [0001] The invention relates to a rotation angle detection device. Background technique [0002] A general magnetic rotation angle detector uses the result of detecting the magnetic field generated by the multi-pole magnetic pattern of the rotating drum by a magnetic sensor to detect the rotation angle of the rotating drum as a motor connected to the rotating drum via a shaft. The rotation angle of the rotating body etc., wherein the multi-pole magnetic pattern of the above-mentioned rotating drum is alternately magnetized at the magnetization pitch λ to form N poles / S poles on the outer periphery of the rotating drum. A magnetoresistance effect element (MR element) such as an AMR element is used as a magnetic sensor, and this magnetic sensor uses the property that the resistance of the AMR element changes with a change in a magnetic field. In the magnetic sensor, a change in the magnetic field caused by the rotation of the rotary drum is detected by an MR e...

Claims

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Application Information

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IPC IPC(8): G01D5/245G01B7/30G01D5/244
CPCG01D5/145G01D5/2451G01B7/30G01D5/245
Inventor 浅野匠武舍武史西泽博志冈室贵士长谷川伦康
Owner MITSUBISHI ELECTRIC CORP
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