47 results about "Barkhausen effect" patented technology

Provided is an electric power generating element and the like that are easy to appropriately apply a magnetic field to a magnetic body and easy to be manufactured. Electric power generating element (32) includes magnetic body (40) that exhibits a large Barkhausen effect, coil (42) wound around magnetic body (40), first soft magnetic body (44) positioned outside coil (42) in a winding axis line direction in which winding axis line (B) of coil (42) extends and positioned outside magnetic body (40) in a radial direction around winding axis line (B), and filling member (48) that includes a second soft magnetic body and fills a gap between magnetic body (40) and first soft magnetic body (44).

A position detection device includes: a first support; a second support that is movable relative to the first support; a power generation sensor disposed on the first support; and a magnetic field generation source fixed to the second support. The relative movement of the second support causes a plurality of magnetic poles having the same polarity to sequentially enter the detection region of the power generation sensor. The power generation sensor includes: a magnetic wire configured to exhibit a large Barkhausen effect; a coil wound around the magnetic wire; and a first magnetic flux conducting piece and a second magnetic flux conducting piece respectively magnetically coupled to the opposite end portions of the magnetic wire and each having a magnetic flux conducting end opposed to the detection region.

Provided is a power generation element or the like in which a power generation amount is less likely to vary. Power generation element (100) includes magnetic member (110) that produces a large Barkhausen effect because of a change in an external magnetic field, coil (130) wound around magnetic member (110), and ferrite member (150) disposed side by side with coil (130) along a winding axis direction of coil (130) and including opening (151) into which a part of magnetic member (110) is inserted. In the winding axis direction, ferrite member (150) includes end surface (152) positioned farther than end surface (111) of magnetic member (110).

The present invention suppresses the occurrence of erroneous detection by a rotation detector. A rotation detector (1) is provided with: a magnet (10) that rotates around a predetermined axis; a power generation circuit (50) having a power generation element (20) that generates power using the large Barkhausen effect, a voltage detection unit (31) that detects the voltage generated by the power generation element (20), and a power storage unit (32) that stores power generated by the power generation element (20); a rotation position detection unit (60) having a magnetic sensor (61) provided corresponding to the power generation element (20) and an information processing unit (62) for determining the rotation position of the rotation shaft; a power supply unit (70) that supplies power generated by the power generation element (20) to the magnetic sensor (61); and a control circuit (80). The control circuit (80) controls the supply of power generated by the power generation element (20) from the power supply unit (70) to the magnetic sensor (61) on the basis of the voltage generated by the power generation element (20), the first voltage threshold value, and the second voltage threshold value.

The rotation detection device includes an annular multi-pole magnet provided on a rotating shaft and a power generation sensor that detects a magnetic field that changes with rotation of the multi-pole magnet. The power generation sensor includes a magnetic conductive wire exhibiting a large Barkhausen effect, a coil wound around the magnetic conductive wire, and a pair of magnetic flux conduction sheets comprising soft magnetic members magnetically coupled to both ends of the magnetic conductive wire, respectively. The annular multi-pole magnet has a magnetization pattern inclined with respect to the rotation axis at the outer peripheral portion. The power generation sensor faces the magnetization pattern of the multipole magnet in a posture in which the axial direction of the magnetic wire is parallel to the rotation axis.

Provided is a power generation element or the like which can easily apply a magnetic field to a magnet appropriately and is easy to manufacture. The power generation element (32) is provided with: a magnet (40) that generates a large Barkhausen effect; a coil (42) wound around the magnet (40); a first soft magnet (44) that is positioned further to the outside than the coil (42) in the winding axis direction in which the winding axis (B) of the coil (42) extends, and that is positioned further to the outside than the magnet (40) in the radial direction centered on the winding axis (B); and a filling member (48) including a second soft magnet and filled between the magnet (40) and the first soft magnet (44).

As the traditional anti-counterfeiting technology has certain limitation, the anti-theft and anti-counterfeiting label adopting the amorphous alloy is widely applied because the amorphous alloy has a Barkhausen effect and can generate voltage change under the excitation of an alternating magnetic field. The composite filament with the double coercive forces contains the two coercive forces, and in the magnetization process, when an external magnetic field is equal to or larger than a critical switching field, the magnetization overturning process of an inner core single domain from one residual magnetism state to the other residual magnetism state is rapidly completed in one step. When an alternating excitation signal is applied to a label containing double coercive forces, a plurality of voltage signals can be induced at different moments, and the authenticity of the label can be judged by measuring parameters such as the number of peak values and the interval of the peak values of the induced voltage signals. The anti-counterfeit performance of the anti-counterfeit label made of the composite filament with the double coercive force is remarkably improved.

The present application relates to an encoder with a high magnetic permeability structure for improving vibration resistance and impact resistance in an encoder equipped with a magnetic power generation element having a large Barkhausen effect. An encoder (10) with a high magnetic permeability structure is provided with a rotating disk (2), a magnetic field generating portion (3), a magnetic power generation element (4) having a large Barkhausen effect, and a magnetic detection element (5), wherein one or more high magnetic permeability structures (6) capable of changing the relative position with respect to the magnetic power generation element (4) are provided, and the magnetic field generating portion (3) is configured independently of the disk (2).

The invention relates to a magnetic sensor and a magnetic sensor device. A region in which a component other than a magnetic sensor or a magnetic sensor device is disposed is added on a component mounting surface of a substrate on which the magnetic sensor or the magnetic sensor device using a large Barkhausen effect is disposed. A magnetic sensor (1) is provided with a magnetic wire (2) that plays a large Barkhausen effect, a coil (3), and a bobbin (4) having a wire winding part in which the magnetic wire is disposed and the coil (3) is provided on the outer periphery thereof, and a pair of pillar parts (7) provided on both end portions of the wire winding part, respectively. The pair of pillar portions respectively protrude downward from both end portions of the wire winding portion, and the protruding amount of the pair of pillar portions is set such that, when the magnetic sensor (1) is mounted on the substrate (11), a component placement space (8) in which a component (12) can be placed is formed between a portion of the outer peripheral surface of the coil facing the component placement surface (11A) and the component placement surface.

To provide a rotation detector capable of executing more stable rotation position detection processing.SOLUTION: The rotation detector 1 includes a magnet 10 rotating together with a rotation shaft 11, a power generation circuit 20 having a power generation element 21 generating power by utilizing the large Barkhausen effect, a magnetic sensor 41, an information processing part 42 detecting the rotation position of the rotation shaft 11, and a power supply part 30 supplying power to the magnetic sensor 41 and the information processing part 42, the power generation circuit 20 includes a first power storage part 23 storing power generated by the power generation element 21, a second power storage part 26 for storing power, and a power storage control part 27 controlling charging and discharging according to the voltage of the first power storage part 23 and the voltage of the second power storage part 26, the first power storage device 23 supplies power necessary for the rotation position detection processing to the power supply unit 30. At the end of the rotation position detection processing, the second power storage device 26 stores part of the power remaining in the first power storage device 23 before the first power storage device 23 is discharged to the outside in the discharge processing.SELECTED DRAWING: Figure 1

Methods and systems for generating entropy and eliminating non-random components of Barkhausen effect signals are disclosed. In one method, a Barkhausen signal (BS) is captured by applying a varying magnetic field to a ferromagnetic material and measuring variations in magnetic flux. The magnetic field is based on an oscillating signal, and the BS includes random and non-random components. The BS is converted into a digital data stream and stored in a memory array. A first portion of the data stream is stored as elements in a first memory array, and a second portion of the data stream is stored as elements in a second memory array. Elements of the first memory array are subtracted from elements of the second memory array. The subtraction results including random components of the BS and eliminating non-random components of the BS are stored.

The aim is to improve vibration and shock resistance in a coding device equipped with a magnetic force-generating element exhibiting a large Barkhausen effect. A coding device 10 with a high-permeability structure is a coding device comprising a rotating disk 2, magnetic field-generating elements 3, a magnetic force-generating element 4 exhibiting a large Barkhausen effect, and a magnetic sensor 5, wherein one or more high-permeability structures, i.e., highly permeable structures 6, are provided to be able to change relative positions with respect to the magnetic force-generating element 4, and wherein the magnetic field-generating elements 3 are arranged independently of the disk 2.

To suppress misalignment between multiple magnetic sensors and reduce the labor required for mounting work when mounting the multiple magnetic sensors on a substrate in order to detect the rotation of a rotating body using the multiple magnetic sensors.SOLUTION: A magnetic sensor device 3 comprises: multiple magnetic sensors 4 which include a magnetic wire material 5 exhibiting large Barkhausen effect and a coil arranged on the outer circumference of the magnetic wire material 5; and a casing 16 to which the multiple magnetic sensors 4 are fixed. The multiple magnetic sensors 4 are arranged on the same reference surface as the lower surface of the casing 16 at a prescribed interval in the circumferential direction around a reference line that is perpendicular to the reference surface such that the extension direction of the magnetic wire material 5 is parallel to the reference surface.SELECTED DRAWING: Figure 1

To easily arrange a magnetic sensor so that a position of the magnetic sensor with respect to a rotary shaft comes to a designed position.SOLUTION: A magnetic sensor device 3 includes a magnetic sensor 4 having a magnetic wire material exhibiting a large Barkhausen effect, a yoke 21, a casing 22 housing the magnetic sensor 4 and the yoke 21, and a sensor fixing part 28 fixing the casing 22 to a substrate. A terminal 15 of the magnetic sensor 4 is a compression terminal, and when the casing 22 is fixed to the substrate by the sensor fixing part 28, the terminal 15 is pressed against the conductor part of the substrate and electrically connected to the conductor part.SELECTED DRAWING: Figure 4

A power generation element (10) is provided with: a plurality of magnetic wires (11) having a large Barkhausen effect; a pickup coil (12) wound around a wire harness of the plurality of magnetic wires (11); and a magnetic connection member (13) that magnetically connects ends of the plurality of magnetic wires (11) to each other at both ends of the plurality of magnetic wires (11), the magnetic wires (11) generating a pulse voltage in the pickup coil (12) by a large Barkhausen effect when a magnetic field applied to the magnetic wires (11) is reversed.

Provided is a rotation detector capable of executing stable rotation position detection processing. The rotation detector includes a magnet that rotates together with the rotating shaft, a power generation circuit having a power generation element that generates power using a large Barkhausen effect, a magnetic sensor, an information processing unit that detects a rotational position of the rotating shaft, and a power supply unit that supplies power to the magnetic sensor and the information processing unit. The power generation circuit includes a first power storage unit that stores power generated by the power generation element, a second power storage unit that stores power, and a power storage control unit that controls charging and discharging on the basis of the voltage of the first power storage unit and the voltage of the second power storage unit. The first power storage unit supplies power required for rotational position detection processing to the power supply unit. The second power storage unit stores a portion of power remaining in the first power storage unit before the first power storage unit discharges to the outside by the discharge process at the end of the rotational position detection process.

A power generation sensor includes a magnetic wire configured to exhibit a large Barkhausen effect, a coil wound around the magnetic wire, and a pair of magnetic flux conducting pieces that include a pair of magnetically-soft components respectively magnetically coupled to the opposite end portions of the magnetic wire. The pair of magnetic flux conducting pieces include a pair of axis-orthogonal portions respectively fixed to the opposite end portions of the magnetic wire and respectively extending parallel to each other orthogonally to the axial direction from the opposite end portions of the magnetic wire, and a pair of axis-parallel portions extending toward each other in the axial direction from the distal ends of the axis-orthogonal portions with their adjacent ends opposed to each other and spaced a gap from each other in the axial direction.

A rotation speed detector includes: a base material to be attached to a rotating body; a first magnetic pole having an arcuate strip shape and provided on the base material; a second magnetic pole having an arcuate strip shape and provided on the base material; and a power generation element including a magnetic wire configured to cause a large Barkhausen effect, and a pickup coil. The power generation element is arranged to face the first magnetic pole and the second magnetic pole so that a longitudinal direction of the magnetic wire is provided along a radial direction of the first magnetic pole and the second magnetic pole. A non-magnetic gap is provided between the first magnetic pole and the second magnetic pole.

The invention provides an encoder which can detect the rotation angle in one rotation and the amount of multiple rotations with redundancy. A redundant encoder (100) is configured to be provided with: a first rotation detection unit (10) which is provided with a magnetic field generation unit (5) having an N pole (2) and an S pole (3), each of which has two or more poles, and which detects the amount of rotation at a resolution of 1 / 2 revolutions or less; and a second rotation detection unit (20) that detects the amount of rotation at a higher resolution than the first rotation detection unit (10). The magnetic field generation unit (5) uses a permanent magnet. The first rotation detection unit (10) is configured so as to be provided with a magnetic power generation element (26) having a large Barkhausen effect, and a magnetic detection element (27) having a Hall effect or a magnetoresistive effect.

The vibration power generation module (60) is attached to the vibrating body (32) via a spring (21), and the spring constant and self-weight of the spring (21) are determined so as to resonate in a pendulum-like motion together with the spring (21) by the vibration of the vibrating body (32). It includes a magnet part (24) provided with a permanent magnet, and a power generation element (10) in which a voltage is generated by electromagnetic induction and the large Barkhausen effect in a coil wound around a magnetic core due to a change in the magnetic field based on the relative displacement of the position between the resonating magnet part (24).

This invention provides a composite magnetic line, etc., that can stabilize the amount of electricity generated in power generation utilizing the Great Barkhausen effect. [Solution] The composite magnetic wire 110 comprises a core material 111 made of a non-magnetic material and a cylindrical magnetic member 112 made of a magnetic material that produces a large Barkhausen effect in response to changes in an external magnetic field, and which has a cylindrical shape that covers the core material 111. The cylindrical magnetic member 112 is continuous without interruption around the entire circumference of the core material 111.

It is an object to make it possible for magnetic sensors to be readily disposed in such a manner that the position of the magnetic sensors relative to the rotary shaft corresponds to the design position. The magnetic sensor device 3 comprises a magnetic sensor 4 having a magnetic wire rod that generates a large Barkhausen effect, a yoke 21, a casing 22 in which the magnetic sensor 4 and the yoke 21 are accommodated, and sensor securing portions 28 for securing the casing 22 to a substrate. The terminals 15 of the magnetic sensor 4 are compression terminals, and, as the casing 22 is secured to the substrate by the sensor securing portions 28, the terminals 15 are pressed against conductor portions on the substrate and are electrically connected to the conductor portions.

[Problem] To provide an encoder capable of detecting a rotation angle within one rotation and detecting the amount of multi-rotations, both with redundancy.　[Solution] A redundant encoder 100 has a configuration comprising: a first rotation detection unit 10 that includes a magnetic field generation unit 5 having two or more N poles 2 and two or more S poles 3 and detects a rotation amount with a resolution of less than or equal to 1 / 2 rotation; and a second rotation detection unit 20 that detects a rotation amount with a resolution higher than that of the first rotation detection unit 10. A permanent magnet is used for the magnetic field generation unit 5. The first rotation detection unit 10 has a configuration including a magnetic power generation element 26 that exhibits a large Barkhausen effect and a magnetic detection element 27 that exhibits a Hall effect or a magnetoresistance effect.

To enable easy installation of a magnetic sensor on a substrate along with other electrical and electronic components.SOLUTION: A magnetic sensor device 3 includes a sensor unit 4 and substrate-side connectors 24, 25. The sensor unit 4 comprises a magnetic sensor, a yoke, and a casing 19. The magnetic sensor includes: a magnetic wire material exhibiting a large Barkhausen effect; a bobbin in which the magnetic wire material is arranged; a coil formed by winding a wire around the bobbin; and a sensor-side connector provided on the left end of the bobbin and a sensor-side connector provided on the right end of the bobbin. The magnetic sensor device 3 is installed on a substrate 35 by mounting the substrate-side connectors 24, 25 onto the substrate 35 and then connecting the sensor unit 4 to the substrate-side connectors 24, 25.SELECTED DRAWING: Figure 3

To provide an encoder that can detect a rotation angle in one rotation and detect the amount of multiple rotations with redundancy.SOLUTION: A redundant encoder 100 comprises: a first rotation detection unit 10 that includes a magnetic field generation unit 5 having two or more N poles 2 and two or more S poles 3 and detects the amount of rotations with a resolution of 1 / 2 rotation or less; and a second rotation detection unit 20 that detects the amount of rotations with a resolution higher than the first rotation detection unit 10. A permanent magnet is used for the magnetic field generation unit 5. The first rotation detection unit 10 comprises a magnetic power generation element having a large Barkhausen effect, and a magnetic detection element having a Hall effect or a magnetoresistance effect.SELECTED DRAWING: Figure 1

To increase a region where components other than a magnetic sensor or a magnetic sensor device are arranged, in a component placement surface of a substrate where the magnetic sensor or the magnetic sensor device is arranged utilizing a large Barkhausen effect.SOLUTION: A magnetic sensor 1 includes: a magnetic wire material 2 for exerting a large Barkhausen effect; a coil 3; and a bobbin 4. The bobbin 4 includes: an electric wire winding part in which the magnetic wire material 2 is arranged inside and a coil 3 is provided at an outer peripheral part; and a pair of support pillar parts 7 provided at both end side portions of the electric wire winding part. The pair of support pillar parts 7 protrudes downward from both end side parts of the electric wire winding parts, respectively. The protrusion amounts are set in such a manner that, when the magnetic sensor 1 is mounted on the substrate 11, a component arrangement space 8 is formed where a component 12 can be placed between a portion opposing to a component placement surface 11A on the outer peripheral surface of the coil 3 and the component placement surface 11A.SELECTED DRAWING: Figure 4

The present invention relates to a magnetic detection device. Even when three magnetic sensors are intensively mounted on a single substrate, the distances between the magnetic wire materials and the axis of the rotation axis are made equal to each other, thereby improving the accuracy of signal processing for identifying the rotation of the rotation axis. The magnetic detection unit (30) of the rotation detection device includes three magnetic sensors (31 to 33) and a substrate (45) on which these magnetic sensors are mounted. Each magnetic sensor includes a magnetic wire material (34) that generates the large Barkhausen effect, a coil (35), and a bobbin (36). Each magnetic sensor is arranged on the substrate such that the elongation direction of the magnetic wire material is parallel to the substrate (45). The magnetic detection unit is arranged on the outer peripheral side of the track of the magnetic field forming unit such that the elongation direction of the magnetic wire material is parallel to the axial direction of the rotation axis (3). In each magnetic sensor, the position of the magnetic wire material arrangement portion (38) in the bobbin is set such that the distances between the magnetic wire materials of the three magnetic sensors and the rotation axis are equal to each other.

An encoder capable of detecting both the rotation angle within one rotation and the amount of multiple rotations with redundancy. [Solution] A redundant encoder 100 includes a magnetic field generating unit 5 having two or more north poles 2 and two or more south poles 3, a first rotation detecting unit 10 that detects the amount of rotation with a resolution of 1 / 2 rotation or less, and a second rotation detecting unit 20 that detects the amount of rotation with a higher resolution than the first rotation detecting unit 10. A permanent magnet is used for the magnetic field generating unit 5. The first rotation detecting unit 10 includes a magnetic generating element having the large Barkhausen effect, and a magnetic detecting element having the Hall effect or magnetoresistance effect.

[Problem] To enhance vibration resistance and impact resistance in an encoder equipped with a magnetic power generation element having a large Barkhausen effect.　[Solution] An encoder 10 with a high permeability structure comprises a rotating disk 2, a magnetic field generation part 3, a magnetic power generation element 4 having a large Barkhausen effect, and a magnetic detection element 5. One or a plurality of high permeability structures, viz. high permeability structures 6, are provided so that the relative positions thereof with respect to the magnetic power generation element 4 are changeable. The magnetic field generation part 3 is disposed independently of the disk 2.

The magnetic sensor device 3 comprises a sensor unit 4 and substrate-side connectors 24, 25. The sensor unit 4 comprises a magnetic sensor, a yoke, and a casing 19. The magnetic sensor comprises a magnetic wire rod that generates a large Barkhausen effect, a bobbin having the magnetic wire rod disposed therein, a coil formed by winding an electrical wire around the bobbin, a sensor-side connector provided in the left end portion of the bobbin, and a sensor-side connector provided in the right end portion of the bobbin. The magnetic sensor device 3 is provided on the substrate 35 by mounting the substrate-side connectors 24, 25 to the substrate 35 and, thereafter, connecting the sensor unit 4 to the substrate-side connectors 24, 25.