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Magnetic detection device

A magnetic detection and detection technology, which is applied in the direction of measuring devices, using electrical devices, measuring magnetic variables, etc., can solve the problems of poor versatility, configuration position dependence, angle deviation, etc., and achieve the effect of simple rotation angle information

Inactive Publication Date: 2014-05-21
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if Figure 13 As shown in A, it is difficult to arrange the TMR element 101 and the TMR element 102 at exactly the same point. Therefore, they are actually arranged with a certain gap, which will cause an angular deviation.
This angular deviation will be the cause of poor accuracy when detecting rotation
[0021] Additionally, if Figure 13 As shown in (b), in the case where the TMR elements 101 and 102 are arranged at positions far away from each other, although the influence of the angular deviation can be reduced, the arrangement position depends on the size of the magnetized rotor 121. The size of the magnetized rotor 121 determines the arrangement position of the TMR element 101 and the TMR element 102, which causes the problem of poor versatility

Method used

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Experimental program
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Effect test

Embodiment approach 1

[0048] Hereinafter, the present invention will be described with reference to the drawings of the embodiments.

[0049] figure 1 It is a circuit configuration diagram showing the magnetic detection device according to Embodiment 1 of the present invention.

[0050] figure 1 , the TMR element 1 is stacked by stacking as Figure 11 The magnetization fixed layer 111, the non-magnetic intermediate layer 112, and the magnetization free layer 113 are composed of the shown magnetization fixed layer 111, the non-magnetic intermediate layer 112, and the magnetization free layer 113, and a predetermined voltage va is supplied to the input terminal of the TMR element 1, and its output terminal is connected to the terminal of the operational amplifier 2 as an amplifying unit. an input terminal. The other input terminal of the operational amplifier 2 is supplied with a power supply voltage vb as a reference potential, and an output vout is generated at its output terminal. The output...

Embodiment approach 2

[0063] Figure 4 It is a circuit configuration diagram showing the magnetic detection device according to Embodiment 2 of the present invention.

[0064] In the figure, the fixed resistor 4 is connected to the output terminal and one input terminal of the operational amplifier 2 as the amplifying unit, and determines the multiple of the gain, and its resistance value is set as the resistance value RA, and its temperature coefficient is set to be the same as The temperature coefficients of resistance of the TMR elements 1 are the same. other structures with figure 1 Embodiment 1 in is the same.

[0065] Figure 5 It is a simulation diagram showing the operation waveform when the temperature in Embodiment 2 is changed to -40°C, 27°C, and 150°C, va=0[V], vb=1[V], RA=20k[Ω], TMR Conductance value of element 1=0.000075+0.000025b×cosθ[G], temperature coefficient TC1 of TMR element 1 and fixed resistor 4=0.001, and θ is converted into time to represent. As shown in the figure, ...

Embodiment approach 3

[0079] Figure 6 is a circuit configuration diagram showing a magnetic detection device according to Embodiment 3 of the present invention, in which the second amplification unit is connected to Figure 4 Magnetic detection device in.

[0080] In the figure, the rear stage of the operational amplifier 2 as the first amplifying unit is provided with: a buffer 10, an operational amplifier 11 as the second amplifying unit, fixed resistors 12, 13 for determining the gain of the operational amplifier 11, and an operational amplifier connected to the operational amplifier. The other input terminal of 11 is connected to the reference potential vc.

[0081] With the above configuration, the output amplitude of the operational amplifier 11 can be adjusted by the fixed resistor 12 and the fixed resistor 13, and the offset component of the output amplitude of the operational amplifier 11 can be adjusted by the reference potential vc.

[0082] That is, if Figure 7 As shown by the wave...

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Abstract

For the purpose of obtaining a magnetic detection device which accurately detects rotational angle information of an object to be detected in a simpler configuration, the magnetic detection device includes a magnetoresistive element 1 composed of: a magnetization fixed layer111, a magnetization free layer113, and a nonmagnetic intermediate layer 112 sandwiched between the magnetization fixed layer and the magnetization free layer. A potential difference between both ends of the magnetoresistive element 1 is fixed voltage, and a change in current value 1 of the magnetoresistive element with respect to a change in magnetic field is detected.

Description

technical field [0001] The invention relates to a magnetic detection device which uses a magnetoresistive element and uses changes in a magnetic field to detect the rotation angle of a detected object. Background technique [0002] A detection method is known in which electrodes are formed at both ends of a magnetoresistive element as an electromagnetic conversion element to form a Wheatstone bridge circuit, and a power supply of a rated voltage is connected between opposite electrodes of the Wheatstone bridge circuit. Changes in the magnetic field acting on the magnetoresistive element are detected by converting the resistance value change of the magnetoresistive element into a voltage change (Japanese Patent No. 3017061). [0003] Figure 10 is a circuit configuration diagram showing such a Wheatstone bridge circuit. [0004] In the figure, the magnetoresistive elements 101, 102, 103, 104 constituting the bridge circuit are as Figure 11 As shown, there is a lamina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/09
CPCG01D5/145G01B7/30
Inventor 馆沼义范川野裕司
Owner MITSUBISHI ELECTRIC CORP