WO2022185655A1 - Dispositif de détection - Google Patents

Dispositif de détection Download PDF

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Publication number
WO2022185655A1
WO2022185655A1 PCT/JP2021/046081 JP2021046081W WO2022185655A1 WO 2022185655 A1 WO2022185655 A1 WO 2022185655A1 JP 2021046081 W JP2021046081 W JP 2021046081W WO 2022185655 A1 WO2022185655 A1 WO 2022185655A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
permanent magnets
sensor
sensing device
substrate
Prior art date
Application number
PCT/JP2021/046081
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English (en)
Japanese (ja)
Inventor
智 市村
裕亮 竹中
千絵 小林
宏太 土肥
耕平 山口
明 山岸
瑞 小木
Original Assignee
株式会社日立製作所
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Filing date
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Application filed by 株式会社日立製作所 filed Critical 株式会社日立製作所
Publication of WO2022185655A1 publication Critical patent/WO2022185655A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux

Definitions

  • the present invention relates to a sensing device equipped with a sensor unit that measures physical quantities such as magnetic fields, acceleration, and temperature.
  • Electromagnetic devices such as transformers, motors, and generators are equipped with sensing devices, for example, to monitor and diagnose their abnormalities and deterioration, and to detect the displacement of their constituent moving bodies.
  • a sensing device includes, for example, a sensor unit that measures physical quantities such as a magnetic field, acceleration, and temperature.
  • a sensor unit for measuring a magnetic field comprises, for example, a magnetic sensor.
  • Patent Document 1 discloses a magnetic sensor that uses a permanent magnet that generates a constant magnetic field around the magnetic sensor as means for fixing the magnetic sensor to a sensor fixing plate (iron plate).
  • Patent Literature 2 discloses a displacement detection device that includes two magnets and a magnetic sensor and detects displacement of a moving object having magnetism.
  • a conventional magnetic sensor that uses a permanent magnet as a fixing means to an object to which it is attached such as the magnetic sensor described in Patent Document 1, has the advantage that it can be easily attached to and removed from the object to which it is attached. It is difficult to measure magnetic fields smaller than the constant magnetic field generated by Therefore, such a conventional magnetic sensor has a problem that it is difficult to detect minute changes in the magnetic field around the magnetic sensor.
  • An object of the present invention is to provide a sensing device that includes a sensor unit that can be fixed to an object to be attached with a permanent magnet, and that can detect minute magnetic fields around the object to be attached.
  • a sensing device comprises a sensor unit comprising a magnetic sensor and a plurality of permanent magnets.
  • the plurality of permanent magnets form regions in which the combined magnetic field intensity of the permanent magnets is zero or nearly zero in two or more directions.
  • the magnetic sensor is installed in the area.
  • a sensing device that includes a sensor unit that can be fixed to an object to be attached with a permanent magnet and that can detect a minute magnetic field around the object to be attached.
  • FIG. 2 is a front view showing the configuration of a sensor unit included in the sensing device according to Example 1 of the present invention
  • FIG. 2 is a cross-sectional view taken along line AA shown in FIG. 1, showing the configuration of the sensor unit of Example 1
  • 1 is a front view of a three-phase AC transformer in which a sensing device according to Example 1 is installed
  • FIG. FIG. 4 is a front view showing the structure of a sensor unit included in a sensing device according to Example 2 of the present invention
  • FIG. 5 is a cross-sectional view taken along line BB shown in FIG. 4, showing the configuration of the sensor unit of Example 2
  • FIG. 10 is a front view showing the configuration of a sensor unit included in a sensing device according to Example 3 of the present invention
  • FIG. 7 is a cross-sectional view taken along line CC shown in FIG. 6, showing the configuration of the sensor unit of Example 3
  • 4 is a front view showing another configuration of the sensor unit included in the sensing device according to the first embodiment
  • a sensing device includes a sensor unit having sensors for measuring physical quantities such as magnetic field, acceleration, and temperature, and measures physical quantities of electromagnetic equipment such as transformers, switches, gas circuit breakers, motors, and generators. It is possible.
  • An electromagnetic device in which a sensing device according to the present invention measures a physical quantity includes an attachment object having a portion made of a magnetic material. The sensor unit is fixed to this attachment object with a permanent magnet, and measures a physical quantity with the sensor. By using the sensing device according to the present invention, it is possible to monitor and diagnose the internal state of an electromagnetic device (for example, if the electromagnetic device is a transformer, an abnormality or deterioration of the iron core or windings).
  • the sensing device measures the magnetic field (leakage magnetic field) of a transformer as a physical quantity of an electromagnetic device.
  • a sensing device includes a sensor unit that can be easily attached to and removed from a magnetic attachment object.
  • the sensor unit includes a plurality of permanent magnets and magnetic sensors.
  • the magnetic sensor is installed at a position where the combined magnetic field intensity of the plurality of permanent magnets is zero or substantially zero in two or more directions, particularly in two or more directions orthogonal to each other. Therefore, the sensing device according to the embodiment of the present invention can accurately measure minute magnetic fields around the object to be attached in two or more directions.
  • FIG. 1 A sensing device according to Example 1 of the present invention will be described with reference to FIGS. 1 to 3 and 8.
  • FIG. 1 A sensing device according to Example 1 of the present invention will be described with reference to FIGS. 1 to 3 and 8.
  • FIG. 3 is a front view of a three-phase AC transformer 1000 in which the sensing device according to this embodiment is installed.
  • a three-phase AC transformer 1000 includes a tank 400 and an iron core and windings 51 , 52 , 53 for each phase inside the tank 400 .
  • the iron core has a main leg, an upper yoke, and a lower yoke.
  • the windings 51, 52, 53 are each wound around the main leg of the iron core.
  • the windings 51, 52, 53 are fixed to each other by an upper fastener 40a and a lower fastener 40b, and are installed on the bottom of the tank 400 via support members 61, 62, 63, respectively.
  • the tank 400 is made of a magnetic steel plate, and high-pressure bushings 141, 142, and 143 are arranged on the upper surface of the tank 400.
  • the sensing device according to this embodiment comprises a sensor unit and an auxiliary unit.
  • the object to which the sensor unit is attached is the tank 400 .
  • the sensor units 101, 102 and 103 are fixed to the bases of the high pressure bushings 141, 142 and 143 on the surface of the tank 400, respectively.
  • Sensor units 104 , 105 and 106 are fixed in front of tank 400 near the central axes of windings 51 , 52 and 53 inside transformer 1000 , respectively.
  • the sensor units 101, 102, 103, 104, 105, 106 are connected to the auxiliary units 201, 202, 203, 204, 205, 206 by wires 301, 302, 303, 304, 305, 306, respectively.
  • the auxiliary units 201 to 206 have a function of supplying power to the sensor units 101 to 106 via wires 301 to 306, a function of controlling the measurement of physical quantities (magnetic fields) by the sensor units 101 to 106, a function of It has a function of collecting the measurement data of the units 101-106 from the sensor units 101-106 and a function of transmitting the collected measurement data to other devices such as a host system.
  • the sensor units 101 to 106 will be explained. In the following description, the sensor units 101 to 106 are represented by the sensor unit 100. FIG. The sensor unit 100 shall be fixed to the tank 400 of the transformer 1000 which is an attachment object.
  • FIG. 1 is a front view showing the configuration of a sensor unit 100 included in the sensing device according to this embodiment.
  • FIG. 2 is a diagram showing the configuration of the sensor unit 100, and is a cross-sectional view taken along line AA shown in FIG.
  • the sensor unit 100 includes a magnetic sensor 1, a substrate 70, a magnetic member 6, and four permanent magnets 21, 22, 23, and 24.
  • the magnetic sensor 1 measures the leakage magnetic field of the transformer 1000 as a physical quantity of electromagnetic equipment. do.
  • the magnetic sensor 1 is capable of measuring, for example, the strength of magnetic fields in three mutually orthogonal directions, and is installed on one surface of the substrate 70 .
  • the magnetic sensor 1 has two directions perpendicular to the surface of the substrate 70 (the magnetization directions of the permanent magnets 21 to 24) and two directions parallel to the surface of the substrate 70 (perpendicular to the magnetization directions of the permanent magnets 21 to 24).
  • the strength of the magnetic field can be measured in two directions perpendicular to each other in the same plane.
  • the substrate 70 is a support member for the magnetic sensor 1 and is made of a non-magnetic insulator, such as resin.
  • the shape and size of the substrate 70 are arbitrary, and FIGS. 1 and 2 show a square substrate 70 as an example.
  • the magnetic sensor 1 is fixed to the central portion of one surface of the square substrate 70 .
  • a magnetic member 6 is fixed to the other surface of the substrate 70 with an adhesive.
  • the magnetic member 6 is plate-shaped in this embodiment, it can have any shape and size. 1 and 2 show the magnetic member 6 having the same shape and size as the substrate 70 as an example.
  • the magnetic member 6 is preferably a steel plate.
  • the magnetic member 6 has a substrate 70 installed on one surface, and permanent magnets 21, 22, 23, and 24 installed on the other surface (the surface opposite to the surface on which the substrate 70 is installed). .
  • the permanent magnets 21, 22, 23, and 24 are arranged to surround the magnetic sensor 1 in the same plane, that is, on the other surface of the plate-shaped magnetic member 6, as shown in FIG.
  • the permanent magnets 21 to 24 have the same distance from the magnetic sensor 1, and the permanent magnets 21 to 24 adjacent to each other in the circumferential direction of a circle centered on the magnetic sensor 1 have the same distance.
  • the permanent magnets 21 and 23 are located at one diagonal position of the magnetic member 6 and the permanent magnets 22 and 24 are located at the other diagonal position of the magnetic member 6 . are fixed at two diagonal positions.
  • the magnetization directions (magnetization directions) of the four permanent magnets 21 to 24 are perpendicular to the magnetic member 6 (perpendicular to the paper surface of FIG. 1).
  • the four permanent magnets 21 to 24 are fixed to the magnetic member 6 so that their magnetization directions are opposite to those of the permanent magnets 21 to 24 adjacent in the circumferential direction of a circle centered on the magnetic sensor 1 .
  • the permanent magnet 22 has a magnetization direction opposite to that of the permanent magnets 21 and 23 .
  • the lines of magnetic force produced by the permanent magnets 21 to 24 are indicated by dashed arrows.
  • the directions of magnetization of the permanent magnets 22 and 23 are indicated by white arrows.
  • the permanent magnets 21 to 24 have the same shape and size, and the same amount of magnetization (amount of magnetization).
  • the sensor unit 100 is fixed to the surface of the tank 400 by four permanent magnets 21-24.
  • the tank 400 has magnetism and is an object to which the sensor unit 100 is attached.
  • the permanent magnets 21 to 24 are in contact with the surface of the tank 400, and the magnetic member 6, the permanent magnets 21 to 24, and the tank 400 form a closed magnetic path. do. Therefore, the leakage magnetic field of the permanent magnets 21 to 24 to the surface of the substrate 70 on which the magnetic sensor 1 is attached is reduced.
  • the permanent magnets 21 to 24 are arranged so that their magnetization directions are opposite to those of the permanent magnets 21 to 24 adjacent in the circumferential direction.
  • the shape of the leakage magnetic field to the surface on which the magnetic sensor 1 is attached is a quadrupolar cusp shape, like the magnetic lines of force indicated by the dashed arrows in FIG.
  • the magnetic field produced by the permanent magnets 21 to 24 can be arbitrarily set at the position of the magnetic sensor 1. Intensity in two or more directions is zero or near zero.
  • the magnetic fields generated by the permanent magnets 21 to 24 at the position of the magnetic sensor 1 are generated in three mutually orthogonal directions (for example, the magnetization direction of the permanent magnets 21 to 24 and the two directions perpendicular to each other) are all zero or nearly zero.
  • the strength of the magnetic field is substantially zero means that the value of the magnetic field can be considered to be zero, that is, the value of the magnetic field is a value that can be considered sufficiently small compared to the dynamic range of the magnetic field that can be measured by the magnetic sensor 1. It is to be.
  • the permanent magnets 21 to 24 form a region in which the intensity of the composite magnetic field of the permanent magnets 21 to 24 is zero or substantially zero in arbitrary two or more directions
  • the magnetic sensor 1 is installed in this area. Therefore, for example, in the three directions in which the magnetic sensor 1 measures the strength of the magnetic field (the magnetization directions of the permanent magnets 21 to 24 and the two directions perpendicular to each other in the plane perpendicular to the magnetization directions of the permanent magnets 21 to 24), permanent All the strengths of the composite magnetic fields of the magnets 21-24 are zero or nearly zero.
  • the sensor unit 100 is not affected by the magnetic field of the permanent magnets 21 to 24 that fix the sensor unit 100 to the mounting object (tank 400), and the minute magnetic field in any direction around the mounting object can be detected.
  • magnetic field can be measured by the magnetic sensor 1 .
  • the magnetic sensor 1 can detect minute changes in the magnetic field in any direction originating from the object to which it is attached.
  • the shapes of the substrate 70 and the magnetic member 6 are arbitrary, and they do not have to be square plates as shown in FIGS.
  • FIG. 8 is a front view showing another configuration of the sensor unit 100 included in the sensing device according to this embodiment.
  • the substrate 70 and the magnetic member 6 are rectangular plates.
  • the four permanent magnets 21, 22, 23, and 24 are positioned on the circumference of the magnetic sensor 1 on the surface of the plate-shaped magnetic member 6, that is, in the plane perpendicular to the magnetization direction of the permanent magnets 21 to 24. are arranged at equal intervals in the circumferential direction. That is, the permanent magnets 21 to 24 are at equal distances from the magnetic sensor 1, and the permanent magnets 21 to 24 adjacent to each other in the circumferential direction of a circle with the magnetic sensor 1 at the center are at equal distances. Further, the permanent magnets 21 to 24 are arranged so that their magnetization directions are opposite to those of the permanent magnets 21 to 24 adjacent in the circumferential direction of a circle centered on the magnetic sensor 1 .
  • the four permanent magnets 21 to 24 have two planes 80 that are parallel to the magnetization directions of the permanent magnets 21 to 24 (perpendicular to the magnetic member 6 and the substrate 70) and perpendicular to each other through the position of the magnetic sensor 1. , 81, the magnetic sensor 1 is installed in a region where the combined magnetic field intensity of the permanent magnets 21 to 24 is zero or substantially zero in arbitrary two or more directions. There will be
  • the sensor units 101 to 106 when the sensor units 101 to 106 are attached to the tank 400 of the transformer 1000, the sensor units 101, 102 and 103 are mounted on high-voltage bushings 141 and 142, respectively. , 143 can be detected.
  • Sensor units 104 , 105 , 106 can detect leakage magnetic fields that are highly correlated with the magnetic fields generated by windings 51 , 52 , 53 inside transformer 1000 . By using these leakage magnetic fields, for example, abnormalities and deterioration of the transformer 1000 can be monitored and diagnosed.
  • the four permanent magnets 21 to 24 are arranged in any desired direction of the magnetic member 6 if the intensity of the composite magnetic field of the permanent magnets 21 to 24 is zero or substantially zero in arbitrary two or more directions at the position of the magnetic sensor 1. It can be installed at any position and can have any amount of magnetization, shape and size. That is, the four permanent magnets 21 to 24 can form a region in the magnetic member 6 in which the strength of the composite magnetic field is zero or nearly zero in two or more arbitrary directions, and the magnetic sensor is formed in this region of the magnetic member 6. 1 can be installed at any position on the magnetic member 6, and the amount of magnetization, shape and size may be different from each other.
  • a sensing device according to Example 2 of the present invention will be described with reference to FIGS. In the following, the sensing device according to the present embodiment will be described with respect to the points that differ from the sensing device according to the first embodiment.
  • FIG. 4 is a front view showing the configuration of the sensor unit 100 included in the sensing device according to this embodiment.
  • FIG. 5 is a diagram showing the structure of the sensor unit 100, and is a cross-sectional view taken along the line BB shown in FIG.
  • a sensor unit 100 included in the sensing device according to this embodiment includes an acceleration sensor 2 and a temperature sensor 3 .
  • the acceleration sensor 2 and the temperature sensor 3 are installed on one surface (the surface on which the magnetic sensor 1 is installed) of a substrate 70 that is a support member for the magnetic sensor 1.
  • the acceleration sensor 2 measures the acceleration (vibration) of the surface of the tank 400
  • the temperature sensor 3 measures the temperature of the surface of the tank 400 .
  • the acceleration sensor 2 and the temperature sensor 3 are attached close to the surface of the tank 400 to which they are attached. Therefore, in the sensor unit 100 included in the sensing device according to the present embodiment, the plate-like magnetic member 6 (for example, a steel plate) is positioned to face the substrate 70 with the magnetic sensor 1, the acceleration sensor 2, and the temperature sensor 3 interposed therebetween. is provided.
  • Four permanent magnets 21 - 24 are installed between the substrate 70 and the magnetic member 6 . That is, the sensors 1-3 and the permanent magnets 21-24 are installed between the substrate 70 and the magnetic member 6.
  • the sensors 1-3 and the permanent magnets 21-24 are sealed and fixed with a resin 8. That is, the sensor unit 100 is configured by providing a resin 8 between the substrate 70 and the magnetic member 6 to which the sensors 1 to 3 and the permanent magnets 21 to 24 are fixed.
  • One surface of the permanent magnets 21 to 24 may or may not be fixed to the magnetic member 6 , and the other surface may or may not be fixed to the substrate 70 .
  • the sensor unit 100 is fixed to the surface of the tank 400, which is the mounting object, by the permanent magnets 21-24.
  • the substrate 70 contacts the surface of the tank 400 .
  • the sensing device can measure not only the magnetic field but also the acceleration and temperature as the physical quantities of the electromagnetic device. Moreover, since the sensors 1 to 3 and the permanent magnets 21 to 24 are sealed with the resin 8, the handling of the sensor unit 100 is easy, and the durability of the sensor unit 100 can be improved.
  • the sensing device has a structure in which the sensor for measuring one type of physical quantity and the permanent magnets 21 to 24 are sealed with a resin 8.
  • a configuration in which the sensor 1 and the permanent magnets 21 to 24 are sealed with the resin 8 may be provided.
  • a sensing device according to Example 3 of the present invention will be described with reference to FIGS. In the following, the sensing device according to the present embodiment will be described with respect to the points that differ from the sensing device according to the first embodiment.
  • FIG. 6 is a front view showing the configuration of the sensor unit 100 included in the sensing device according to this embodiment.
  • FIG. 7 is a diagram showing the structure of the sensor unit 100, and is a cross-sectional view taken along line CC shown in FIG.
  • a sensor unit 100 included in the sensing device according to this embodiment includes a magnetic sensor 1 , a substrate 71 , a substrate 72 , two permanent magnets 20 and 30 and a magnetic member 6 .
  • the magnetic sensor 1 is capable of measuring, for example, the strength of magnetic fields in three mutually orthogonal directions, and is positioned between the substrates 71 and 72 .
  • the substrates 71 and 72 are support members for the magnetic sensor 1 and are arranged so as to sandwich the magnetic sensor 1 .
  • the substrates 71 and 72 are made of a non-magnetic insulator, such as resin.
  • the shape and size of the substrates 71 and 72 are arbitrary, and disk-shaped substrates 71 and 72 are shown in FIGS. 6 and 7 as an example. In the example shown in FIGS. 6 and 7, the substrates 71 and 72 are of the same size.
  • the magnetic sensor 1 is fixed to the central portion of one surface of the disk-shaped substrate 71 .
  • a permanent magnet 20 is fixed to the other surface of the substrate 71 .
  • a permanent magnet 30 is fixed to one surface of the disk-shaped substrate 72 .
  • a magnetic sensor 1 is fixed to the center of the other surface of the substrate 72 .
  • the magnetic member 6 is cylindrical and is preferably made of a steel plate. 6 and 7 show a cylindrical magnetic member 6 as an example.
  • a cylindrical magnetic member 6 has a bottom at one end and an opening at the other end.
  • the magnetic member 6 accommodates the magnetic sensor 1, substrates 71 and 72, and permanent magnets 20 and 30 inside.
  • the magnetic sensor 1 , substrates 71 and 72 , and permanent magnets 20 and 30 are sealed inside the magnetic member 6 with a resin 8 and fixed. That is, the sensor unit 100 is configured by providing the magnetic sensor 1, the substrates 71 and 72, and the resin 8 fixing the permanent magnets 20 and 30 inside the cylindrical magnetic member 6.
  • the permanent magnet 30 is positioned at the bottom of the cylindrical magnetic member 6 .
  • the permanent magnet 30 may or may not be fixed to the bottom surface of the magnetic member 6 .
  • a permanent magnet 20 is positioned in an opening at the other end of the cylindrical magnetic member 6 .
  • the permanent magnets 20 and 30 are installed at the same positions in a plane parallel to the substrates 71 and 72 (in a plane parallel to the plane of the paper).
  • the permanent magnets 20 and 30 have the same cylindrical shape, and the magnetic sensor 1 is positioned at the center of the bottom surface of the cylindrical permanent magnets 20 and 30. are placed.
  • the magnetization directions of the permanent magnets 20 and 30 are perpendicular to the substrates 71 and 72 (perpendicular to the paper surface of FIG. 6), and are arranged side by side in the magnetization direction with the magnetic sensor 1 interposed therebetween.
  • the permanent magnets 20 and 30 have the same magnetization directions. In FIG. 7, the directions of magnetization of the permanent magnets 20 and 30 are indicated by white arrows. In this embodiment, the permanent magnets 20 and 30 have the same amount of magnetization.
  • the sensor unit 100 is fixed to the surface of the tank 400, which is the mounting object, by means of the permanent magnets 20 located in the opening of the cylindrical magnetic member 6.
  • the permanent magnet 20 and the magnetic member 6 are in contact with the surface of the tank 400, and the permanent magnets 20 and 30, the magnetic member 6 and the tank 400 form a magnetic path.
  • the two permanent magnets 20 and 30 have the same magnetization direction as described above, they form a magnetic field whose direction is mainly in one direction, like the lines of magnetic force indicated by the dashed arrows in FIG. That is, the direction of the magnetic field generated by the permanent magnets 20 and 30 is mainly the magnetization direction of the permanent magnets 20 and 30 (the direction perpendicular to the paper surface of FIG. 6, that is, the horizontal direction in FIG. 7). (the center of the cylindrical bottom surface), it can be considered that there are only magnetization directions of the permanent magnets 20 and 30 .
  • the magnetic field generated by the permanent magnets 20 and 30 has an intensity of two or more arbitrary directions perpendicular to the magnetization directions of the permanent magnets 20 and 30 (directions parallel to the paper surface of FIG. 6) at the position of the magnetic sensor 1. is zero or near zero.
  • the permanent magnets 20 and 30 are such that the strength of the composite magnetic field of the permanent magnets 20 and 30 is zero in arbitrary two or more directions perpendicular to the magnetization directions of the permanent magnets 20 and 30 .
  • an area is formed in which the magnetic field is substantially zero, and the magnetic sensor 1 is installed in this area.
  • the magnetic sensor 1 can measure a minute magnetic field around the mounting object without being affected by the magnetic field 30 .
  • the magnetic sensor 1 can detect minute changes in the magnetic field originating from the object to which it is attached in any two or more directions perpendicular to the magnetization directions of the permanent magnets 20 and 30, particularly in two or more directions perpendicular to each other. .
  • the direction in which a minute magnetic field can be measured is the direction perpendicular to the magnetization directions of the permanent magnets 20 and 30, which is limited compared to the sensing device according to the first embodiment.
  • the sensing device according to the present embodiment uses a smaller number of permanent magnets than the sensing device according to the first embodiment, and the sensor unit 100 can be made smaller. It has the advantage of being easy to install and easy to handle.
  • the two permanent magnets 20 and 30 are such that, at the position of the magnetic sensor 1, the intensity of the composite magnetic field of the permanent magnets 20 and 30 is zero or substantially zero in two or more directions orthogonal to the magnetization directions of the permanent magnets 20 and 30. , it can be installed at any position inside the magnetic member 6, and can have any amount of magnetization, any shape, and any size. That is, the two permanent magnets 20 and 30 form a region inside the magnetic member 6 in which the intensity of the composite magnetic field is zero or substantially zero in two or more directions orthogonal to the magnetization directions of the permanent magnets 20 and 30. As long as the magnetic sensor 1 can be installed in this area inside the magnetic member 6, it can be installed at any position inside the magnetic member 6, and the amount of magnetization, shape, and size may be different from each other.
  • the present invention is not limited to the above embodiments, and various modifications are possible.
  • the above embodiments have been described in detail in order to facilitate understanding of the present invention, and the present invention is not necessarily limited to aspects having all the described configurations.
  • part of the configuration of one embodiment can be replaced with the configuration of another embodiment.
  • add the configuration of another embodiment to the configuration of one embodiment.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

La présente invention concerne un dispositif de détection comprenant une unité de capteur qui peut être fixée à un objet de fixation par un aimant permanent, le dispositif de détection étant capable de détecter un petit champ magnétique sur la périphérie de l'objet de fixation. Le dispositif de détection de la présente invention comprend une unité de capteur (100) pourvue d'un capteur magnétique (1) et d'une pluralité d'aimants permanents (21-24). La pluralité d'aimants permanents (21-24) forment une région dans laquelle l'intensité d'un champ magnétique composite des aimants permanents (21-24) est nulle ou sensiblement nulle dans deux ou plus de deux directions. Le capteur magnétique (1) est installé dans ladite région.
PCT/JP2021/046081 2021-03-04 2021-12-14 Dispositif de détection WO2022185655A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021034328A JP7492474B2 (ja) 2021-03-04 2021-03-04 センシング装置
JP2021-034328 2021-03-04

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WO2022185655A1 true WO2022185655A1 (fr) 2022-09-09

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011223422A (ja) * 2010-04-12 2011-11-04 Yamaha Corp 物理量センサ及びマイクロフォン
WO2012014546A1 (fr) * 2010-07-30 2012-02-02 三菱電機株式会社 Dispositif de détection de substance magnétique
JP2013015351A (ja) * 2011-07-01 2013-01-24 Shinshu Univ 磁界検出装置、及び環境磁界のキャンセル方法
JP2013081520A (ja) * 2011-10-06 2013-05-09 Yamaha Corp 金属部材検出装置
WO2015174409A1 (fr) * 2014-05-13 2015-11-19 三菱電機株式会社 Dispositif de capteur magnétique
WO2017126373A1 (fr) * 2016-01-19 2017-07-27 株式会社村田製作所 Dispositif de détection de milieu magnétique
JP2018205241A (ja) * 2017-06-08 2018-12-27 Tdk株式会社 磁気センサ及びカメラモジュール
WO2020149375A1 (fr) * 2019-01-17 2020-07-23 キヤノン電子株式会社 Capteur d'identification magnétique

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011223422A (ja) * 2010-04-12 2011-11-04 Yamaha Corp 物理量センサ及びマイクロフォン
WO2012014546A1 (fr) * 2010-07-30 2012-02-02 三菱電機株式会社 Dispositif de détection de substance magnétique
JP2013015351A (ja) * 2011-07-01 2013-01-24 Shinshu Univ 磁界検出装置、及び環境磁界のキャンセル方法
JP2013081520A (ja) * 2011-10-06 2013-05-09 Yamaha Corp 金属部材検出装置
WO2015174409A1 (fr) * 2014-05-13 2015-11-19 三菱電機株式会社 Dispositif de capteur magnétique
WO2017126373A1 (fr) * 2016-01-19 2017-07-27 株式会社村田製作所 Dispositif de détection de milieu magnétique
JP2018205241A (ja) * 2017-06-08 2018-12-27 Tdk株式会社 磁気センサ及びカメラモジュール
WO2020149375A1 (fr) * 2019-01-17 2020-07-23 キヤノン電子株式会社 Capteur d'identification magnétique

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