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Magnetoelectric sensor

A magnetoelectric sensor and sensor technology, applied in the field of magnetoelectric sensors and interference magnetoelectric sensors, can solve the problems of unreliable elimination of interference signals, interference, real signal distortion, etc.

Inactive Publication Date: 2021-06-22
王红卫
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Problems solved by technology

[0003] Because this type of magnetoelectric sensor works in the way that the magnetic induction line exposed at the opening of the iron core is cut by the object to be detected, it is impossible to use ferromagnetic materials to completely seal the magnetoelectric sensor, so when the magnetic field outside the magnetoelectric sensor changes, it will also Causes the change of the magnetic flux in the iron core, generates an induced electromotive force in the coil, and causes interference
[0004] In order to reduce the interference caused by the change of the external magnetic field of the magnetoelectric sensor, a filter circuit is usually installed at the output end of the magnetoelectric sensor to weaken the interference signal, but this method cannot reliably eliminate the interference signal, and the filter circuit will also cause real signal distortion

Method used

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Examples

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Embodiment 1

[0037] Embodiment one: the magnetoelectric sensor adopts as attached Figure 9 As shown in the internal structure, the annular iron core is made of Permalloy steel strip or silicon steel strip with a width of 18 mm and a thickness of 0.1 mm, and is wound 20 layers along the "B" shape on a mold similar to the "B" shape. , stacked with a thickness of 20 mm as the annular iron core, and the cylindrical iron core uses three NdFeB permanent magnets with a diameter of 18 mm and a length of 30 mm. The magnetic poles are at both ends of the column. The residual magnetic strength of the three magnets is the same. Connect one end of the three cylindrical iron cores with the annular iron core, the length of the annular iron core between every two cylindrical iron cores is the same, and the axial centerlines of the three cylindrical iron cores are on a plane, The magnetic S pole of the cylindrical iron core in the middle of the three cylindrical iron cores is connected to the annular iron...

Embodiment 2

[0039] Embodiment two: the magnetoelectric sensor adopts as attached Figure 10 As shown in the internal structure, the ring-shaped iron core is made of permalloy or silicon steel and cast into a ring-shaped iron core similar to a "B" shape, and the cross-sectional size of any point of the iron core is the same. The cylindrical iron core is made of three cylinders with a diameter of 18 mm and a length of 10 mm made of silicon steel. One end of the three cylindrical iron cores is connected with the annular iron core, and the annular iron core between each cylindrical iron core The length is the same, the axial center lines of the three cylindrical iron cores are on one plane, and a cylindrical NdFeB permanent magnet with a diameter of 18 mm and a length of 20 mm is installed on the other end of the three cylindrical iron cores. The magnetic flux density of the two permanent magnets is the same. The N pole of the permanent magnet in the middle of the three cylindrical iron cores ...

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Abstract

A magnetoelectric sensor comprises an iron core, a magnetic flux detection element and a shielding box. At least three columnar iron cores are arranged; at least one columnar iron core has magnetism, and magnetic poles are arranged at the two ends of the columnar iron core. One ends of all the columnar iron cores enter a magnetic shielding box, an annular iron core is arranged in the magnetic shielding box, and the ends, entering the magnetic shielding box, of the columnar iron cores are connected with the annular iron core at equal intervals in the circumferential direction of the annular iron core. A magnetic flux detection element is arranged between two adjacent columnar iron cores on the annular iron core, and electromotive force or voltage generated by the detection element is connected in series or processed by a signal circuit, output electromotive force (voltage variation) caused by the detection elements in the annular iron core when an annular changing magnetic field in the circumferential direction of the annular iron core exists is added, and the sum of the electromotive force (voltage variation) serves as output of the magnetoelectric sensor. The magnetoelectric sensor can weaken or eliminate interference of an external magnetic field of the sensor; according to the magnetoelectric sensor, an annular iron core can be omitted.

Description

technical field [0001] The invention relates to the field of magnetoelectric sensors, in particular to the field of magnetoelectric sensors capable of resisting interference caused by changes in the external magnetic field of the sensor. Background technique [0002] The currently known magnetoelectric sensor consists of a U-shaped iron core made of ferromagnetic material and a coil wound on the iron core. The iron core is magnetic, and the magnetic induction line in the iron core is formed by the opening of the iron core and the space of the detection area. A closed loop, when a ferromagnetic substance passes through the detection area and cuts the magnetic induction line in the detection area, the magnetic flux in the magnetic circuit changes, and an induced electromotive force is generated in the coil, thereby obtaining information about the passage of the detected object. [0003] Because this type of magnetoelectric sensor works in the way that the magnetic induction li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/10
CPCG01V3/10
Inventor 王红卫
Owner 王红卫
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