Power generation element, power generation module, rotational speed detector, and power generator

Abstract

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.

Description

Technical Field

[0001] The present disclosure relates to a power generation element including a magnetic wire having a large Barkhausen effect and a pickup coil, and a power generation module, a rotation speed detector, and a generator including the same. Background Art

[0002] In the past, in order to detect the number of rotations per unit time of a motor, i.e., the speed, by self-generating electricity without the need for a battery, or to operate electronic equipment using electricity generated by tiny vibrations of structures such as bridges or machinery within factories, a generating element having a large Barkhausen effect and a pickup coil was used.

[0003] In a power generation element having a magnetic wire with a large Barkhausen effect and a pickup coil, a pickup coil is wound around the magnetic wire. Hereinafter, the power generation element having a magnetic wire with a large Barkhausen effect and a pickup coil is referred to as a power generation element. When the power generation element exceeds a specific trigger magnetic field strength, the magnetization direction of the magnetic wire is suddenly reversed under the influence of the external magnetic field, and a voltage is generated in the pickup coil.

[0004] For the power generating element, the higher the voltage generated in the pickup coil, the higher the detection accuracy of the rotation speed. In addition, for the power generating element, the higher the voltage generated in the pickup coil, the higher the high-performance electronic equipment can be operated. Therefore, in the power generating element, it is necessary to increase the voltage generated in the pickup coil.

[0005] Patent document 1 discloses a power generation element formed by winding a pickup coil around at least two magnetic wires. In the power generation element disclosed in Patent document 1, since the pickup coil is wound around a plurality of magnetic wires, the voltage generated in the pickup coil when the trigger magnetic field strength exceeds the trigger magnetic field strength is higher than that of a power generation element having a single magnetic wire.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application No. 2022-519668 Summary of the invention

[0009] Problems to be solved by the invention

[0010] However, in the power generation element disclosed in the above-mentioned Patent Document 1, due to slight deviations in the trigger magnetic field strength of each magnetic wire due to manufacturing deviations of the magnetic wire or slight differences in the magnetic field applied from the magnet to each magnetic wire, the timing of power generation is deviated, so that when the number of magnetic wires is N, the voltage generated in the pickup coil is lower than the voltage N times when the number of magnetic wires is 1. Therefore, it is necessary to realize a power generation element that suppresses the reduction of the voltage generated in the pickup coil due to manufacturing deviations of the magnetic wires.

[0011] The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to obtain a power generating element that suppresses a decrease in a voltage generated in a pickup coil due to manufacturing variations in a magnetic wire.

[0012] Solutions to Solve Problems

[0013] In order to solve the above-mentioned problems and achieve the purpose, the power generation element involved in the present disclosure has a plurality of magnetic wires having a large Barkhausen effect and a pickup coil wound around the wire bundle of the plurality of magnetic wires. The power generation element has a magnetic connection member that magnetically connects the ends of the plurality of magnetic wires to each other at both ends of the plurality of magnetic wires.

[0014] Effects of the Invention

[0015] According to the present disclosure, an effect is achieved in which a power generating element can be obtained in which a decrease in a voltage generated in a pickup coil due to manufacturing variations in a magnetic wire is suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a perspective view showing the structure of the power generating element according to the first embodiment.

[0017] Figure 2 This is a schematic diagram showing the effect obtained by magnetically connecting both ends of the magnetic wire in the power generating element according to the first embodiment.

[0018] Figure 3 This is a schematic diagram showing the effect obtained by covering both ends of the magnetic wire with the cylindrical magnetic member in the power generating element according to the first embodiment.

[0019] Figure 4 It is a perspective view showing the structure of a power generating element according to the second embodiment.

[0020] Figure 5 It is a perspective view showing the structure of a power generation module according to the third embodiment.

[0021] Figure 6 It is a perspective view showing the structure of a rotation speed detector according to the fourth embodiment.

[0022] Figure 7 It is a plan view showing a magnet and a power generating element included in the rotation speed detector according to the fourth embodiment.

[0023] Figure 8 It is a perspective view showing the structure of a generator according to the fifth embodiment.

[0024] Fig. 9 It is a perspective view showing the structure of a power generation element included in a stator of a generator according to the fifth embodiment. DETAILED DESCRIPTION

[0025] Hereinafter, a power generation element, a power generation module, a rotation speed detector, and a generator according to the embodiments will be described in detail with reference to the drawings.

[0026] Implementation Method 1

[0027] Figure 1 1 is a perspective view showing the structure of the power generation element according to Embodiment 1. The power generation element 10 according to Embodiment 1 includes: a plurality of magnetic wires 11 having a large Barkhausen effect; a pickup coil 12 wound around the bundle of the magnetic wires 11; and magnetic connection members 13 respectively arranged at both ends of the magnetic wires 11. The magnetic connection member 13 includes a cylindrical magnetic member 131 and a resin sealing material 132 filled in the cylinder of the cylindrical magnetic member 131.

[0028] The magnetic wire 11 has a magnetostrictive effect, and expands and contracts due to magnetostriction according to a change in an applied magnetic field.

[0029] The cylindrical magnetic member 131 is a cylindrical body formed by a soft magnetic body such as iron. The magnetic permeability of the cylindrical magnetic member 131 can be any higher than that of air, but it is preferably higher than that of the magnetic wire 11. As a soft magnetic body, steel materials such as SS400 or S45C, magnetic stainless steel materials such as SUS430 or SUS440, or high magnetic permeability materials such as Permalloy or Perminder alloy can be used. In the power generation element 10, the wider the interval between the cylindrical magnetic members 131, the more the magnetization reversal region of the magnetic wire 11 increases, thereby generating more power. Therefore, it is preferred that one of the two cylindrical magnetic members 131 is arranged at one end of the magnetic wire 11 or as close to the one end as possible, and the other of the two cylindrical magnetic members 131 is arranged at the other end of the magnetic wire 11 or as close to the other end as possible.

[0030] The resin sealant 132 has a hardness that does not hinder the expansion and contraction of the magnetic wire 11 due to magnetostriction. The resin sealant 132 fixes the magnetic wire 11 in a state where the ends of the magnetic wire 11 are in contact with the cylindrical magnetic member 131. Therefore, the ends of the magnetic wire 11 are magnetically connected to each other.

[0031] Figure 2 This is a schematic diagram showing the effect obtained by magnetically connecting both ends of the magnetic wire in the power generating element according to the first embodiment. Figure 2 The waveform of the voltage generated in the pickup coil 12 when the two ends of the three magnetic wires 11 are not magnetically connected to each other and when the two ends are magnetically connected to each other is schematically shown. Figure 2 In the figure, the vertical axis represents voltage and the horizontal axis represents the time elapsed from a certain time as a reference. Figure 2 In the figure, the waveforms of the dotted line, the single-dot chain line, and the double-dot chain line represent the waveforms of the voltage when the two ends of the three magnetic wires 11 are not magnetically connected to each other, and the waveforms of the solid line represent the waveforms of the voltage when the two ends of the three magnetic wires 11 are magnetically connected to each other. When the two ends of the three magnetic wires 11 are not magnetically connected to each other, there are deviations in the power generation timing of each magnetic wire 11 due to slight deviations in the trigger magnetic field strength of each magnetic wire due to manufacturing errors of the magnetic wires 11 or slight differences in the magnetic field applied to each magnetic wire from the magnet. Here, if the characteristics of the three magnetic wires 11 are divided into A, B, and C, then usually when the three magnetic wires 11 are simply bundled, each magnetic wire 11 generates voltage in the pickup coil 12 at different timings. Figure 2 In the example shown, the time when the voltage generated by the magnetic wire 11 of characteristic A in the pickup coil 12 reaches the maximum and the time when the voltage generated by the magnetic wire 11 of characteristic C in the pickup coil 12 reaches the maximum are offset by 10 [μs], and the voltage obtained by superimposing the voltages generated by each of the three magnetic wires 11 in the pickup coil 12 is not three times the voltage generated by each of the three magnetic wires 11 in the pickup coil 12. On the other hand, when the ends of the magnetic wire 11 of characteristic A, the magnetic wire 11 of characteristic B, and the magnetic wire 11 of characteristic C are magnetically connected to each other at both ends, as shown in FIG. Figure 2 As shown in the waveform indicated by the solid line, the timing of power generation among the magnetic wires 11 of characteristic A, characteristic B, and characteristic C coincides, and a higher voltage is generated in the pickup coil 12 than when the three magnetic wires 11 are not bundled.

[0032] Figure 3 This is a schematic diagram showing the effect obtained by covering both ends of the magnetic wire with the cylindrical magnetic member in the power generating element according to the first embodiment. Figure 3 The waveforms of the measurement results of the voltage generated in the pickup coil 12 when both ends of the magnetic wire 11 are covered by the cylindrical magnetic member 131 and when both ends are not covered are schematically shown. Figure 3 In the figure, the vertical axis represents voltage and the horizontal axis represents the time elapsed from a certain time as a reference. Figure 3 In FIG. 1 , the single-dot-dashed waveform represents the waveform of the voltage when both ends of the magnetic wire 11 are not covered by the cylindrical magnetic member 131, and the solid waveform represents the waveform of the voltage when both ends of the magnetic wire 11 are covered by the cylindrical magnetic member 131. Figure 3As shown, when both ends of the magnetic wire 11 are covered by the cylindrical magnetic member 131, the voltage generated in the pickup coil 12 is higher than when both ends of the magnetic wire 11 are not covered by the cylindrical magnetic member 131. The reason why the voltage generated in the pickup coil 12 can be increased by covering both ends of the magnetic wire 11 with the cylindrical magnetic member 131 is presumed to be because all of the plurality of magnetic wires 11 are in contact with the cylindrical magnetic member 131, thereby reducing the size of the reverse magnetic field.

[0033] In addition, it was confirmed that if both ends of the magnetic wire 11 were firmly fixed, the voltage generated in the pickup coil 12 would decrease. This is considered to be because the magnetic wire 11 has a magnetostrictive effect, and the magnetic wire 11 expands and contracts due to magnetostriction according to the change of the applied magnetic field, but if both ends of the magnetic wire 11 are firmly fixed, the expansion and contraction of the magnetic wire 11 is hindered, so the magnetic change is hindered and the magnetization reversal is difficult to occur, so the power generation voltage is reduced. The power generation element 10 involved in embodiment 1 is filled with a resin sealing material 132 in the cylinder of the cylindrical magnetic member 131, and the resin sealing material 132 exists between the magnetic wire 11 and the cylindrical magnetic member 131. As described above, the resin sealing material 132 has a hardness that does not hinder the expansion and contraction of the magnetic wire 11 caused by magnetostriction, so the expansion and contraction of the magnetic wire 11 caused by magnetostriction is not hindered by the resin sealing material 132, and the reduction of the voltage generated in the pickup coil 12 can be suppressed.

[0034] In the power generating element 10 according to the first embodiment, the ends of the magnetic wire 11 are magnetically connected to each other by the magnetic connecting member 13 having the cylindrical magnetic member 131 and the resin sealing material 132 , thereby preventing the voltage generated in the pickup coil 12 from decreasing due to manufacturing variations of the magnetic wire 11 .

[0035] Implementation Method 2

[0036] Figure 4 : is a three-dimensional diagram showing the structure of the power generation element involved in the second embodiment. The power generation element 10 involved in the second embodiment has a plurality of magnetic wires 11, a pickup coil 12 wound around the wire bundle of the magnetic wires 11, and a magnetic connection member 13 respectively arranged at both ends of the magnetic wires 11, similarly to the power generation element 10 involved in the first embodiment. However, the magnetic connection member 13 has a cylindrical member 133 respectively covering the two ends of the magnetic wires 11 and a magnetic resin sealing material 134 filled in the cylinder of the cylindrical member 133. In addition, the cylindrical member 133 may also be a non-magnetic body. In addition, in the power generation element 10 involved in the second embodiment, the plurality of magnetic wires 11 are arranged with gaps between them.

[0037] The magnetic resin sealing material 134 is a composite resin material obtained by dispersing magnetic powder as a dispersoid in a resin as a dispersion medium. The magnetic resin sealing material 134 has a hardness that does not hinder the expansion and contraction of the magnetic wire 11 caused by magnetostriction. The magnetic resin sealing material 134 exists between the magnetic wire 11 and the cylindrical member 133 and between the magnetic wires 11. Therefore, the ends of the magnetic wire 11 are magnetically connected to each other through the magnetic resin sealing material 134. The magnetic wires 11 are arranged with gaps between each other, so only the two ends are magnetically connected to each other, and the parts other than the two ends do not contact each other.

[0038] In the power generating element 10 according to the second embodiment, the ends of the magnetic wire 11 are magnetically connected to each other by the magnetic connecting member 13 having the cylindrical member 133 and the magnetic resin sealant 134 . Therefore, it is possible to suppress the voltage generated in the pickup coil 12 from decreasing due to manufacturing variations of the magnetic wire 11 .

[0039] Furthermore, the magnetic wires 11 are not in contact with each other, and only the two ends of the magnetic wires 11 are magnetically connected, so the aspect ratio of each magnetic wire 11 is the same as that of the case where there is only one magnetic wire 11. Therefore, the power generation element 10 involved in the second embodiment can obtain the power generation effect based on magnetization reversal through multiple magnetic wires 11 while reducing the size of the demagnetizing field.

[0040] In addition, the structure in which the ends of the magnetic wires 11 are magnetically connected to each other through the magnetic resin sealing material 134 is described here, but the ends of the magnetic wires 11 can also be magnetically connected to each other by gathering the ends of the magnetic wires 11 with a magnetic metal belt. In addition, the magnetic connection member 13 involved in the second embodiment can also be configured to have a cylindrical magnetic member 131 and a resin sealing material 132 as in the first embodiment, and the magnetic wires 11 are separated from each other by gaps and are respectively in contact with the cylindrical magnetic member 131.

[0041] Implementation 3

[0042] Figure 5: is a perspective view showing the structure of the power generation module involved in the third embodiment. The power generation module 20 involved in the third embodiment includes a power generation element 10, a magnet part 30 and a frame part 40. The power generation element 10 includes a plurality of magnetic wires 11, a pickup coil 12 wound around the magnetic wires 11, and a magnetic connection member 13 respectively arranged at both ends of the magnetic wires 11. The magnetic connection member 13 has a cylindrical member 133 and a magnetic metal belt 135 wound around the ends of the magnetic wires 11. An example of a magnetic metal as a material of the magnetic metal belt 135 can be permalloy, but the material of the magnetic metal belt 135 can also be a magnetic metal other than permalloy. The end of the magnetic wire 11 wound with the magnetic metal belt 135 is inserted into the cylinder of the cylindrical member 133. The plurality of magnetic wires 11 are arranged in the X direction, which is a direction perpendicular to the Y direction as the longitudinal direction. In addition, the direction orthogonal to both the X direction and the Y direction is set as the Z direction. Here, the Y direction is the first direction and the X direction is the second direction.

[0043] The magnet part 30 has a first magnet 31 and a second magnet 32 ​​arranged in the X direction. The first magnet 31 and the second magnet 32 ​​are made of permanent magnets. A spacer 33 made of a non-magnetic body is arranged between the first magnet 31 and the second magnet 32. The non-magnetic body is a material having a relative magnetic permeability of 1 or less.

[0044] The first magnet 31, the second magnet 32 ​​and the spacer 33 are integrally fixed to form the magnet portion 30. The first magnet 31, the second magnet 32 ​​and the spacer 33 may be fixed by bonding, integral molding, screwing, or fastening with a fastening tape, but are not limited to these methods.

[0045] The magnet part 30 can be displaced integrally in the X direction while the first magnet 31 and the second magnet 32 ​​maintain a certain interval in the X direction. In addition, the spacer 33 may be air as long as the first magnet 31 and the second magnet 32 ​​can be displaced integrally in the X direction while the first magnet 31 and the second magnet 32 ​​maintain a certain interval in the X direction.

[0046] The frame portion 40 is made of a non-magnetic body, more specifically, a resin molded body. The frame portion 40 includes a bottom plate 43 parallel to the XY plane, a pair of frame portions 41 located at both ends of the bottom plate 43 in the Y direction, and a pair of frame portions 42 located at both ends of the bottom plate 43 in the X direction. The magnet portion 30 is held in a recessed portion 44 surrounded by the frame portions 41, 42 and the bottom plate 43.

[0047] The width of the recess 44 in the X direction, that is, the interval of the frame 42 in the X direction, is wider than the width of the magnet 30 in the X direction. Therefore, the magnet 30 can be displaced in the X direction within the recess 44.

[0048] The displacement amount of the magnet part 30 is at least twice the distance between the first magnet 31 and the second magnet 32. The movement of the magnet part 30 in the +Z direction is restricted by a guide part (not shown) extending from the frame parts 41 and 42 toward the recessed part 44 in an eave shape.

[0049] The power generating element 10 is arranged in the +Z direction relative to the displaceable range of the magnet portion 30. Figure 5 , a state in which the first magnet 31 and the power generating element 10 are facing each other is shown. When the magnet portion 30 is displaced in the +X direction, the second magnet 32 ​​faces the power generating element 10. That is, the magnetic pole applied to the power generating element 10 is switched by the linear movement of the magnet portion 30. When the state in which the first magnet 31 and the power generating element 10 are facing each other is changed to the state in which the second magnet 32 ​​and the power generating element 10 are facing each other, the magnetic field applied to the magnetic wire 11 is reversed, and a voltage is generated in the pickup coil 12. Similarly, when the state in which the second magnet 32 ​​and the power generating element 10 are facing each other is changed to the state in which the first magnet 31 and the power generating element 10 are facing each other, the magnetic field applied to the magnetic wire 11 is reversed, and a voltage is generated in the pickup coil 12.

[0050] In the power generation module 20 according to the third embodiment, the magnetic wires 11 are arranged in the X direction, so the distances in the Z direction between each magnetic wire 11 and the magnet portion 30 are the same. Therefore, the power generation timing of each magnetic wire 11 is not easily deviated, and the voltage generated in the pickup coil 12 is not easily reduced. In addition, the power generation module 20 may be configured using the power generation element 10 according to the first embodiment or the second embodiment.

[0051] The power generation module 20 according to the third embodiment can suppress a decrease in the voltage generated in the pickup coil 12 due to manufacturing variations in the magnetic wire 11 , and can therefore increase the voltage generated in the pickup coil 12 when the magnet portion 30 is displaced in the X direction due to vibration or the like.

[0052] In addition, the magnetic connecting component 13 involved in embodiment 3 shows a structure having a cylindrical component 133 and a magnetic metal belt 135, but it can also be a structure having a cylindrical magnetic component 131 and a resin sealing material 132 as in embodiment 1, or a structure having a cylindrical component 133 and a magnetic resin sealing material 134 as in embodiment 2.

[0053] Implementation 4

[0054] Figure 6: is a three-dimensional diagram showing the structure of the rotation speed detector involved in the fourth embodiment. The rotation speed detector 50 involved in the fourth embodiment is a magnetic rotation speed detector that detects the rotation speed of a rotating body based on the induced voltage generated as the magnetic field changes. The rotation speed detector 50 detects the number of times the rotating body rotates per unit time. The rotation speed detector 50 includes a power generation module 20 and a processing unit 60. The power generation module 20 has the power generation element 10 involved in the first embodiment or the second embodiment and a magnet portion composed of a magnet 70 arranged opposite to the power generation element 10. The magnet 70 is mounted on the shaft 21 and rotates together with the shaft 21. The magnetic pole applied to the power generation element 10 is switched by the rotational movement of the magnet portion composed of the magnet 70. The power generation element 10 generates an induced voltage in the pickup coil 12 as the magnetic field generated by the rotation of the magnet 70 changes. The signal formed by the voltage generated in the pickup coil 12 is input to the processing unit 60.

[0055] The processing unit 60 counts the number of pulses generated by power generation based on the signal from the power generation element 10. The processing unit 60 detects the rotation speed of the shaft 21 by counting the number of pulses. The processing unit 60 can work using the induced voltage, so the rotation speed of the shaft 21 can be detected without power supply.

[0056] The power generation element 10 is arranged to face the magnet 70 in a direction parallel to the rotation axis 22 of the shaft 21. The power generation element 10 faces the surface of the magnet 70 opposite to the surface on the side fixed to the shaft 21. The power generation element 10 may also be arranged to face the surface of the magnet 70 on the side fixed to the shaft 21.

[0057] Figure 7 FIG. 1 is a top view showing a magnet and a power generating element included in the rotation speed detector according to the fourth embodiment. Figure 7 , the rotation speed detector 50 is shown when the magnet 70 and the power generation element 10 are viewed from the direction parallel to the rotation axis 22 and the opposite side to the axis 21. Figure 7 , the processing unit 60 is omitted from the illustration. The power generating element 10 is arranged to face the magnet 70 at a position away from the center 71 of the plane shape of the magnet 70, that is, the circle. In addition, the rotation speed detector 50 is usually used together with an angle detector that detects the rotation angle of the rotating body. The angle detector includes a circular plate for optical detection formed with an optical slit, a light emitting unit that generates light, and a light receiving unit that detects the light emitted from the light emitting unit and passes through the optical slit. For example, the circular plate is fixed to the rotating body on the upper surface side of the magnet 70. The light emitting unit and the light receiving unit are arranged at a position facing the optical slit. Figure 7 In the figure, the angle detector is omitted.

[0058] The rotation speed detector 50 according to the fourth embodiment can suppress a decrease in the voltage generated in the pickup coil 12 due to manufacturing variations in the magnetic wire 11 , and thus can increase the voltage generated in the pickup coil 12 by the rotation of the shaft 21 .

[0059] Implementation method 5

[0060] Figure 8 1 is a perspective view showing the structure of a generator according to Embodiment 5. The generator 100 according to Embodiment 5 includes a rotor 80 and a stator 90. The rotor 80 includes a cylindrical base 81 and a plurality of magnets 82 arranged on the outer peripheral surface of the base 81. The plurality of magnets 82 are arranged so that magnets with N poles facing outward and magnets with S poles facing outward are alternately arranged in the circumferential direction of the base 81. The stator 90 includes a plurality of power generation elements 10 arranged on the same arc having a center on the rotation center axis 83 of the rotor 80. The plurality of power generation elements 10 are arranged at equal angular intervals. In Embodiment 5, 12 power generation elements 10 are arranged at 30 degree intervals.

[0061] Fig. 9 1 is a perspective view showing the structure of the power generation element provided in the stator of the generator according to the fifth embodiment. The power generation element 10 includes a plurality of magnetic wires 11, a pickup coil 12 wound around the plurality of magnetic wires 11, and magnetic connection members 13 respectively arranged at both ends of the magnetic wires 11. The magnetic connection member 13 includes a cylindrical member 133 and a magnetic resin sealing material 134 filled in the cylinder of the cylindrical member 133. The power generation element 10 provided in the stator 90 of the generator 100 according to the fifth embodiment has the same structure as the power generation element 10 according to the second embodiment, but the number of magnetic wires 11 is larger than that of the power generation element 10 according to the second embodiment, and is generally a number of two to three digits. However, the number of magnetic wires 11 may be a single digit or four digits or more, and is not limited to a specific number. As with the power generation element 10 according to the second embodiment, the magnetic resin sealing material 134 is present between the ends of the magnetic wires 11, and the ends of the magnetic wires 11 are magnetically connected to each other.

[0062] The magnet 82 of the rotor 80 is magnetized to generate magnetic lines of force penetrating the pickup coil 12. When the rotor 80 rotates, the power generation element 10 alternately switches between the state facing the N pole and the state facing the S pole, thereby generating an AC voltage in the pickup coil 12.

[0063] In general generators, in order to efficiently generate electricity relative to the rotation of magnets, an iron core, which is a magnetic body with high magnetic permeability, is often placed in the winding. The generator 100 involved in the fifth embodiment uses a bundle of magnetic wires 11 instead of an iron core, thereby being able to obtain a voltage higher than that of a general generator by an amount corresponding to the self-generation caused by the magnetization reversal of the magnetic wires 11.

[0064] In addition, here, the case where the stator 90 includes the power generation element 10 having the same structure as the power generation element 10 involved in the second embodiment is exemplified, but the power generation element 10 included in the stator 90 may also have the same structure as the power generation element 10 involved in the first embodiment.

[0065] The configuration described in the above embodiment is merely an example of the content, and can be combined with other known technologies, and a part of the configuration can be omitted or changed within a range not departing from the gist.

[0066] Description of Reference Numerals

[0067] 10 power generation element, 11 magnetic wire, 12 pickup coil, 13 magnetic connection member, 20 power generation module, 21 shaft, 22 rotating shaft, 30 magnet portion, 31 first magnet, 32 second magnet, 33 spacer, 40 frame portion, 41, 42 frame portion, 43 bottom plate, 44 recessed portion, 50 rotation speed detector, 60 processing portion, 70, 82 magnet, 71 center, 80 rotor, 81 base, 83 rotating center shaft, 90 stator, 100 generator, 131 cylindrical magnetic member, 132 resin sealing material, 133 cylindrical member, 134 magnetic resin sealing material, 135 magnetic metal belt.

Claims

1. A power generation element, characterized in that: The power generating element comprises: a plurality of magnetic wires having a large Barkhausen effect; a pickup coil wound around the bundle of the plurality of magnetic wires; as well as A magnetic connection member magnetically connects the ends of the plurality of magnetic wires to each other at both ends of the plurality of magnetic wires.

2. The power generating element according to claim 1, characterized in that Among the plurality of magnetic wires, only two end portions are magnetically connected to each other, and portions other than the two end portions are not in contact with each other.

3. The power generating element according to claim 1 or 2, characterized in that: The magnetic connection member includes a cylindrical magnetic member and a resin sealing material filled in the cylinder of the cylindrical magnetic member. The plurality of magnetic wires are in contact with the cylindrical magnetic member, respectively.

4. The power generating element according to claim 3, characterized in that The resin sealing material fixes the ends of each of the plurality of magnetic wires so that the magnetic wires expand and contract due to magnetostriction in response to a change in an applied magnetic field.

5. The power generating element according to claim 1 or 2, characterized in that: The magnetic connection member includes a cylindrical member and a magnetic resin sealing material filled in the cylinder of the cylindrical member. The magnetic resin sealing material is present between the ends of each of the plurality of magnetic wires.

6. The power generating element according to claim 5, characterized in that The magnetic resin sealing material fixes the ends of each of the plurality of magnetic wires so that the magnetic wires expand and contract due to magnetostriction in response to a change in an applied magnetic field.

7. The power generating element according to claim 1 or 2, characterized in that: The magnetic connection member is a magnetic metal tape wound around the ends of the plurality of magnetic wires.

8. A power generation module, characterized in that: The power generation module comprises: The power generating element according to any one of claims 1 to 7; and a magnet portion that switches the magnetic pole applied to the power generating element by rotating or linearly moving, The power generating element generates power through the rotational movement or the linear movement of the magnet portion.

9. The power generation module according to claim 8, characterized in that: The plurality of magnetic wires are arranged in a second direction, the second direction being a direction perpendicular to the first direction as a length direction, The magnet portion includes a plurality of magnets arranged in a parallel manner with intervals therebetween along the second direction.

10. A rotation speed detector, characterized in that: The speed detector comprises: The power generating element according to any one of claims 1 to 7; a magnet portion that switches the magnetic pole applied to the power generating element by rotationally moving; and A processing unit counts pulses formed by a voltage generated in the pickup coil due to the rotational movement of the magnet unit.

11. A generator, characterized in that: The generator has: a rotor having a cylindrical base and a plurality of magnets disposed on an outer peripheral surface of the base; and A stator, wherein the power generating elements according to any one of claims 1 to 7 are arranged at equal angular intervals on the same arc, wherein the same arc has a center on the rotation center axis of the rotor, The plurality of magnets are arranged such that magnets with N poles facing outward and magnets with S poles facing outward are alternately arranged in the circumferential direction of the base.

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