Power generator

Abstract

To provide a power generator 1 with higher power generation performance.SOLUTION: A power generator 1 comprises permanent magnets 30A and 30B, a coil 20, and a soft magnetic plate 10, which is disposed within the coil 20 and includes a tip portion 10a, which displaces between a reference position where it does not oppose the permanent magnets 30A and 30B and an opposing position where it opposes the permanent magnets 30A and 30B in response to an external force.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a power generation device. [Background technology]

[0002] Patent Document 1 discloses a magnetostrictive power generating device including an element capable of generating power based on inverse magnetostriction. Patent Document 2 discloses a power generating device that is easier to manufacture than the configuration disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-103940 [Patent Document 2] Japanese Patent Publication No. 2023-174153 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors of the present application have been studying how to realize a power generator with even higher power generation performance. In the power generator of Patent Document 2, power is generated based on an internal magnetic component generated in the soft magnetic plate when the vertical magnetic field H acting perpendicular to the soft magnetic plate is slightly deviated from the vertical direction due to vibration of the soft magnetic plate. If the angle of deviation of the soft magnetic plate is θ, the in-plane magnetic field component is expressed as H sin θ. In this way, the in-plane magnetic field component is generated based on the value obtained by multiplying the vertical magnetic field H by sin θ. Therefore, in order to improve the power generation performance of the power generator of Patent Document 2, it is conceivable to increase the vertical magnetic field H and its amplitude (sin θ).

[0005] However, if a strong permanent magnet is used to increase the perpendicular magnetic field H, a strong attractive force acts between the permanent magnet and the soft magnetic plate, suppressing the vibration of the soft magnetic material and reducing the amplitude (sin θ), resulting in a decrease in power generation performance.

[0006] An object of the present invention is to provide a power generating device with higher power generating performance. [Means for solving the problem]

[0007] The invention disclosed in this application to solve the above problems has various aspects, and representative aspects thereof are outlined below.

[0008] (1) A power generating device having a permanent magnet, a coil, and a soft magnetic member disposed within the coil, the soft magnetic member including a tip portion that displaces between a reference position that does not face the permanent magnet and an opposing position that faces the permanent magnet in response to an external force.

[0009] (2) In (1), the permanent magnet includes a first permanent magnet having a first magnetic pole portion and a second permanent magnet having a second magnetic pole portion having a different magnetic property from the first magnetic pole portion, and the tip portion displaces between the reference position and a first opposing position facing the first magnetic pole portion, and between the reference position and a second opposing position facing the second magnetic pole portion, in response to the external force.

[0010] (3) In (2), the first permanent magnet is positioned forward of the tip surface of the tip portion in the reference position and above the upper surface of the soft magnetic member with the tip portion in the reference position, and the second permanent magnet is positioned forward of the tip surface of the tip portion in the reference position and below the lower surface of the soft magnetic member with the tip portion in the reference position.

[0011] (4) In the power generating device of (2) or (3), the first permanent magnet is arranged with the tip end inclined relative to the soft magnetic member in the reference position so as to have an opposing surface facing the tip end surface of the tip end portion in the first opposing position, and the second permanent magnet is arranged with the tip end inclined relative to the soft magnetic member in the reference position so as to have an opposing surface facing the tip end surface of the tip end portion in the second opposing position.

[0012] (5) In any one of (2) to (4), the first permanent magnet is arranged to generate a peripheral magnetic field acting perpendicular to the tip surface of the tip portion at the first opposing position, thereby generating a first in-plane magnetic field in the extension direction of the soft magnetic material, and the second permanent magnet is arranged to generate a peripheral magnetic field acting perpendicular to the tip surface of the tip portion at the second opposing position, thereby generating a second in-plane magnetic field in the direction opposite to the first in-plane magnetic field. [Effects of the Invention]

[0013] According to the above aspects (1) to (5) of the present invention, it is possible to provide a power generating device with higher power generating performance. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a diagram schematically illustrating the overall configuration of a power generating device according to an embodiment of the present invention. [Figure 2] 4 is a graph showing the characteristics of the soft magnetic plate of the present embodiment. [Figure 3] 3A and 3B are diagrams for explaining details of the arrangement of permanent magnets and the power generation principle of the power generation device. [Figure 4] 10 is a graph showing an output voltage when vibration is continuously applied to the power generation device. [Figure 5] 10 is a graph showing an output voltage when a momentary shock is applied to the power generating device. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described in detail with reference to the drawings.

[0016] [Overall configuration of power generation device 1] An outline of the overall configuration of a power generating device 1 according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram that schematically shows the overall configuration of a power generating device according to this embodiment.

[0017] 1, the direction indicated by the arrow Z1 is the upward direction, the direction indicated by the arrow Z2 is the downward direction, the direction indicated by the arrow X1 is the forward direction, and the direction indicated by the arrow X2 is the backward direction. The same applies to Fig. 3. In this embodiment, the forward and backward direction is the extension direction of the soft magnetic plate 10.

[0018] In this embodiment, the position of the tip 10a of the soft magnetic plate 10 when no external force is applied is called the reference position. Figure 1 shows the tip 10a of the soft magnetic plate 10 in the reference position.

[0019] The power generating device 1 includes a soft magnetic plate 10, which is a soft magnetic member, a coil 20, a permanent magnet 30A, and a permanent magnet 30B. The power generating device 1 is a power generating device that extracts electric power based on an induced current generated in the coil 20 in response to vibration of the soft magnetic plate 10.

[0020] [Soft magnetic plate 10] The soft magnetic plate 10 is a plate-shaped member made of a soft magnetic material. The soft magnetic plate 10 may be made of, for example, iron, cobalt, nickel, or an alloy thereof. The soft magnetic plate 10 may also be made of, for example, boron, aluminum, silicon, or an alloy containing these elements and iron. Specifically, the soft magnetic plate 10 may be, for example, a pure iron plate, a non-oriented silicon steel plate, an oriented silicon steel plate, or an iron-based amorphous ribbon. The soft magnetic plate 10 has a distal end supported by a support 50. FIG. 1 shows an example in which the distal end of the soft magnetic plate 10 is fastened to the support 50 by a screw 51, which serves as a fastener. In this embodiment, the portion of the soft magnetic plate 10 supported by the support 50 is referred to as the distal end, and the side opposite the distal end in the extension direction of the soft magnetic plate 10 is referred to as the distal end 10a. The distal end 10a may refer to a portion including a distal end surface 10b when the soft magnetic plate 10 is divided into three parts in the extension direction.

[0021] The soft magnetic plate 10 is cantilevered at its distal end by a support 50, and is provided so as to be bendable such that the distal end 10a is displaced relative to the distal end in response to vibration.

[0022] [Coil 20] The soft magnetic plate 10 is disposed within the coil 20. The coil 20 is preferably wound around at least a portion of the soft magnetic plate 10 in the extending direction of the soft magnetic plate 10 (the central axis direction of the coil 20).

[0023] [Permanent magnets 30A and 30B] The opposing surfaces 30Ab and 30Bb of the permanent magnets 30A and 30B are preferably located forward of the tip portions 10a at the reference position. Here, the opposing surfaces 30Ab and 30Bb are the surfaces of the permanent magnets facing the tip portions 10, as shown in FIG. 3 . The opposing surface 30Ab of the permanent magnet 30A is preferably located above the upper surface (line S1 in FIG. 1 ) of the soft magnetic plate 10 when the tip portions 10a are in the reference position, and the opposing surface 30Bb of the permanent magnet 30B is preferably located below the lower surface (line S2 in FIG. 1 ) of the soft magnetic plate 10 when the tip portions 10a are in the reference position. The permanent magnet 30A is preferably located in a position where the tip portions 10a do not face the upper surface of the soft magnetic plate 10 when the tip portions 10a are in the reference position, and the permanent magnet 30B is preferably located in a position where the tip portions 10a do not face the lower surface of the soft magnetic plate 10 when the tip portions 10a are in the reference position. The permanent magnets 30A and 30B are preferably fixed so as not to be displaced in response to vibration.

[0024] The permanent magnets 30A and 30B are objects that retain their magnetic properties without receiving an external magnetic field or current, and may be, for example, ferrite magnets, neodymium magnets, samarium-cobalt magnets, alnico magnets, etc.

[0025] [Characteristics of the soft magnetic plate 10] The characteristics of the soft magnetic plate 10 made of a soft magnetic material will now be described with reference to Fig. 2. Fig. 2 is a graph showing the characteristics of the soft magnetic plate of this embodiment. In Fig. 2, the vertical axis represents magnetic flux density [T (tesla)], and the horizontal axis represents magnetic field [A (ampere) / m].

[0026] The soft magnetic plate 10 has high magnetic permeability. Magnetic permeability is the degree of change in magnetic flux density. As shown in Figure 2, the soft magnetic plate 10 has the property that when the magnetic field deviates from 0 [A / m] to either the positive or negative side, the magnetic flux density changes significantly and reaches saturation.

[0027] FIG. 2 shows an example in which the soft magnetic plate 10 is made of iron-cobalt, whose magnetic flux density varies within a range of approximately −2.5 to +2.5 T. In the inverse magnetostriction method described in Patent Document 1, the magnetic flux density of the magnetic material itself can vary within a range of −1.5 to +1.5 T, but the magnetic flux density can only be varied within a range of approximately +0.3 to 1.5 T. That is, in the inverse magnetostriction method, the amount of change in magnetic flux density is approximately 1 T. On the other hand, the magnetic flux density of the soft magnetic material can vary within a range of approximately −2.5 to +2.5 T, and in this embodiment, the magnetic flux density can be varied throughout that range. That is, in the soft magnetic plate 10, the amount of change in magnetic flux density is approximately 5 T, which is significantly greater than the amount of change in magnetic flux density in the inverse magnetostriction method described in Patent Document 1. In this embodiment, by using a soft magnetic material with such high magnetic permeability, the change in magnetic flux passing through the coil 20 can be increased. As a result, a large induced current is generated in the coil 20, allowing for large power to be extracted.

[0028] [Details of the arrangement of permanent magnets 30A and 30B and power generation principle] Next, the detailed arrangement of the permanent magnets 30A and 30B and the principle of power generation in the power generation device 1 will be described mainly with reference to Fig. 3. Fig. 3 is a diagram for explaining the detailed arrangement of the permanent magnets and the principle of power generation in the power generation device. In Fig. 3, the coil 20 is not shown.

[0029] As described above, the soft magnetic plate 10 is cantilevered by the support 50. Therefore, when an external force is applied to the soft magnetic plate 10, the tip 10a of the soft magnetic plate 10 vibrates up and down with its end as a fulcrum. At this time, the magnetic flux passing through the coil 20 changes over time, generating an induced current in the coil 20, and power can be extracted based on the induced current.

[0030] 3(a) shows a state in which the tip 10a of the soft magnetic plate 10 is displaced upward (first opposing position) relative to the end. The permanent magnet 30A is disposed in a position opposing the tip 10a displaced upward. The permanent magnet 30A includes an S-pole portion 31A and an N-pole portion 32A, and FIG. 3 shows an example in which the S-pole portion 31A is disposed in a position opposing the tip 10a displaced upward.

[0031] The permanent magnet 30A is preferably cubic and has an opposing surface 30Ab that faces the tip surface 10b of the tip portion 10a displaced upward, and is disposed at an angle relative to the soft magnetic plate 10 in the reference position. The angle of inclination of the permanent magnet 30A should be equal to the deviation angle (deflection angle) θ of the soft magnetic plate 10.

[0032] With the tip end 10a displaced upward, an in-plane magnetic field F1 is generated in the soft magnetic plate 10 due to the influence of an ambient magnetic field H1 generated around the permanent magnet 30A. In this embodiment, the in-plane magnetic field F1 acts toward the tip end 10a of the soft magnetic plate 10.

[0033] The characteristics of the soft magnetic plate 10 described with reference to FIG. 2 act to align the magnetic flux within the soft magnetic plate 10 in the same direction as the in-plane magnetic field F1. As a result, in the soft magnetic plate 10 in the state shown in FIG. 3(a), an in-plane magnetic flux H3 is generated from the end portion toward the tip portion 10a. In other words, a continuous magnetic flux is generated from the end portion toward the tip portion 10a of the soft magnetic plate 10. In this way, the magnetic flux passing through the coil 20 changes when the tip portion 10a of the soft magnetic plate 10 is displaced from the reference position to the position shown in FIG. 3(a). As a result, an induced current is generated in the coil 20.

[0034] 3(b) shows the state in which the tip 10a of the soft magnetic plate 10 is displaced downward (second opposing position) relative to the end. The permanent magnet 30B is arranged in a position opposing the tip 10a displaced downward. The permanent magnet 30B includes an N-pole portion 31B and an S-pole portion 32B, and FIG. 3 shows an example in which the N-pole portion 31B is arranged in a position opposing the tip 10a displaced downward.

[0035] The permanent magnet 30B is preferably cubic and disposed at an angle relative to the soft magnetic plate 10, whose tip end 10a is in the reference position, so that it has an opposing surface 30Bb that faces the tip end surface 10b of the tip end 10a displaced downward. The angle of inclination of the permanent magnet 30B should be equal to the deviation angle (deflection angle) θ of the soft magnetic plate 10.

[0036] With the tip 10a displaced downward, an in-plane magnetic field F2 is generated in the soft magnetic plate 10 due to the influence of peripheral magnetic flux H2 generated around the permanent magnet 30B. In this embodiment, the in-plane magnetic field F2 acts from the tip 10a toward the distal end. That is, the in-plane magnetic field F2 acts in the opposite direction to the in-plane magnetic field F1.

[0037] Due to the characteristics of the soft magnetic plate 10 described with reference to FIG. 2, an action occurs that aligns the magnetic flux within the soft magnetic plate 10 in the same direction as the in-plane magnetic field F2. As a result, in the soft magnetic plate 10 in the state shown in FIG. 3(b), an in-plane magnetic flux H4 is generated from the tip 10a to the end. In other words, a continuous magnetic flux is generated from the tip 10a of the soft magnetic plate 10 to the end. In this way, the magnetic flux passing through the coil 20 changes when the tip 10a of the soft magnetic plate 10 is displaced from the reference position to the position shown in FIG. 3(b). As a result, an induced current is generated in the coil 20.

[0038] 3(b) by vibrating. As a result, an in-plane magnetic field F1 and an in-plane magnetic field F2 are generated alternately in the soft magnetic plate 10, and in-plane magnetic flux H3 and in-plane magnetic flux H4 that flow continuously within the soft magnetic plate 10 are generated alternately. Therefore, in the power generating device 1, an induced current is generated in the coil 20 every time the tip end 10a of the soft magnetic plate 10 is displaced up and down, and electric power can be extracted based on the induced current.

[0039] [Examples and Comparative Examples] Next, an example and a comparative example will be described with reference to Figs. 4 and 5. Fig. 4 is a graph showing the output voltage when continuous vibration is applied to the power generation device. Fig. 5 is a graph showing the output voltage when a momentary impact is applied to the power generation device. Figs. 4(a) and 5(a) show the output voltage in an example (comparative example) in which two permanent magnets are arranged to sandwich a soft magnetic plate in the vertical direction as shown in Patent Document 2 mentioned above. Figs. 4(b) and 5(b) show the output voltage in an example (example) in which permanent magnet 30 is arranged as shown in Fig. 1.

[0040] The materials used in the examples and comparative examples were the same, with only the arrangement of the permanent magnets being different. Specifically, in both the examples and comparative examples, a silicon steel plate with a rectangular planar shape of 85 × 20 mm and a thickness of 0.35 mm was used as the soft magnetic plate 10. A 20 mm portion of the end portion was fixed to the support 50. The coil 20 was made of enameled wire with a wire diameter of 0.1 mm and 22,320 turns. The soft magnetic plate 10 was vibrated at a vibration frequency of 50 Hz, and the output voltage was detected.

[0041] As shown in Figure 4(a), in the configuration of the comparative example, when vibration was continuously generated, an output voltage of approximately 6 [V] was obtained. As shown in Figure 4(b), in the configuration of the example, when vibration was continuously generated, an output voltage of approximately 16 [V] was obtained. Furthermore, when the device internal resistance and load resistance were optimized, the instantaneous maximum power was 3 [mW] in the comparative example, while it was 20 [mW] in the example. In other words, the example obtained approximately seven times more power than the comparative example.

[0042] As shown in Figure 5(a), in the configuration of the comparative example, a maximum output voltage of approximately 30 [V] was obtained when a momentary impact was applied. As shown in Figure 5(b), in the configuration of the example, a maximum output voltage of approximately 60 [V] was obtained when a momentary vibration was applied. Furthermore, when the device internal resistance and load resistance were optimized, the instantaneous maximum power was 68 [mW] in the comparative example, while it was approximately 260 [mW] in the example. In other words, the example obtained approximately four times the power of the comparative example. Furthermore, in the example, the attractive force acting between the permanent magnet and the soft magnetic plate was weaker than in the comparative example, so the duration of the vibration was longer. Therefore, the amount of power generated was also large.

[0043] As described above, in both cases where continuous vibration is generated and where a momentary impact is generated, the amount of power generation can be improved by adopting the arrangement of the permanent magnets 30 shown in FIG. 1.

[0044] In addition, when vibrations are to be generated continuously, it is preferable that the power generating device 1 has a vibration source and that a configuration be adopted in which the soft magnetic plate 10 is vibrated based on vibrations generated inside the power generating device 1 but outside the soft magnetic plate 10. In this case, it is preferable that the power generating device 1 has a vibration source that vibrates the support 50, for example. By adopting a configuration including a vibration source in this way, it is possible to obtain stable power as needed.

[0045] [Summary of this embodiment] In the power generating device 1 according to the present embodiment described above, general-purpose soft magnetic materials can be used as the material for the soft magnetic plate 10, which is the object of vibration, making it easy to manufacture and allowing for a wide range of material choices. Furthermore, the entire device can be manufactured inexpensively. Furthermore, the power generating device 1 according to the present embodiment utilizes the characteristic of the soft magnetic plate 10, namely, high magnetic permeability, making it possible to increase the change in magnetic flux passing through the coil 20. Therefore, a large amount of power can be generated.

[0046] 3, in this embodiment, the peripheral magnetic fields H1 and H2 incident perpendicularly to the tip surface 10b of the tip portion 10a generate in-plane magnetic fields F1 and F2. In this way, unlike the configuration disclosed in Patent Document 2, it is possible to generate in-plane magnetic fields F1 and F2 that are not affected by sin θ based on the offset angle θ. Therefore, compared to the configuration of Patent Document 2, the in-plane magnetic fields F1 and F2 can be made 1 / sin θ times (approximately 20 times when θ = 3°), and as a result, a large amount of power can be generated.

[0047] Furthermore, in the configuration of this embodiment, the attractive force acting in a direction that suppresses the amplitude of the soft magnetic plate 10, which is generated by the permanent magnets, is weaker than in the configuration of Patent Document 2. For example, when the in-plane magnetic field is increased by X times (X is an arbitrary value), the attractive force acting in the direction that suppresses the amplitude is X×sinθ times (approximately X×0.05 times when θ=3°) compared to the configuration of Patent Document 2. Therefore, even when permanent magnets 30A and 30B with strong magnetic force are used to improve the amount of power generation, the soft magnetic plate 10 can be vibrated at a desired amplitude.

[0048] [Variations] The soft magnetic plate 10 is not limited to one made of a soft magnetic material itself, but may be one made by bonding a soft magnetic material to a substrate, or one made by providing a soft magnetic material in the form of a thin film. The thin film soft magnetic material may be formed on the substrate by, for example, coating, plating, vapor deposition, sputtering, or the like.

[0049] Furthermore, in this embodiment, an example has been shown in which the permanent magnet 30A is disposed at an angle relative to the soft magnetic plate 10, but this is not limiting. At least a portion of the permanent magnet 30A may be disposed in a position facing the tip portion 10a displaced in response to an external force. The same applies to the permanent magnet 30B.

[0050] In addition, in this embodiment, an example has been shown in which the distal end surface 10b and the opposing surfaces 30Ab and 30Bb are parallel when the amplitude of the distal end portion 10a is at its maximum, but this is not limited to this. For example, when the distal end portion 10a is displaced, there may be a moment when the tangent to the vibration locus of the distal end portion 10a and the opposing surfaces 30Ab and 30Bb become parallel. More specifically, when the distal end portion 10a is displaced, there may be a moment when the distal end surface 10b and the opposing surfaces 30Ab and 30Bb become parallel. With this configuration, the peripheral magnetic fields H1 and H2 can be applied perpendicular to the distal end surface 10b.

[0051] Furthermore, the arrangement of the south pole portion 31A and the north pole portion 32A may be reversed in the permanent magnet 30A, and in this case, the arrangement of the north pole portion 31B and the south pole portion 32B may be reversed in the permanent magnet 30B.

[0052] Furthermore, in this embodiment, an example in which two permanent magnets 30A and 30B are provided has been described, but this is not limiting, and it is preferable to provide at least one of permanent magnet 30A and permanent magnet 30B. Alternatively, the permanent magnet may be U-shaped, with one end of the U functioning as permanent magnet 30A and the other end functioning as permanent magnet 30B.

[0053] In addition, in this embodiment, the soft magnetic plate 10 has been shown to have flat upper and lower surfaces, but this is not limited thereto. For example, the soft magnetic plate 10 may be a plate-like member with a thickness that varies in parts. Furthermore, the tip portion 10a of the soft magnetic plate 10 may be tapered. By tapering or thinning the tip portion 10a, the weight of the tip portion 10a side is reduced, thereby increasing the vibration frequency. As a result, the amount of power generation can be improved.

[0054] In addition, in this embodiment, an example has been shown in which the soft magnetic plate 10 bends in response to vibration, thereby displacing the tip end 10a. However, the soft magnetic plate 10 is not limited to a material that bends in response to vibration, and may be made of a material with high rigidity. In this case, for example, the soft magnetic plate 10 may have its tip end 10a rotatably supported by the support 50 so that it can be displaced in the vertical direction. Furthermore, the soft magnetic plate 10 is not limited to a structure in which the end end is supported, and may have a configuration in which the entire soft magnetic plate 10 moves in the vertical direction in response to an external force. In this case, it is preferable that the entire soft magnetic plate 10 be supported so that it can slide, so that the tip end 10a can be displaced between a position where it does not face the permanent magnet and a position where it faces the permanent magnet.

[0055] [others] The power generation device 1 according to this embodiment can be applied to a wide variety of applications. For example, by installing it on structures such as roads, railways, bridges, and tunnel walls, it can generate power by utilizing vibrations caused by passing vehicles. It can also generate power by utilizing vibrations at factories and construction sites. It can also be used, for example, to keep lighting fixtures on at all times, or as a switch for instantaneously supplying power to various electrical devices. It can also be made possible to store electricity by connecting a capacitor to the power generation device 1.

[0056] The power generation device 1 may also be used as a wireless sensor.

[0057] Although the embodiments and modifications of the present invention have been described above, the specific configurations shown in the embodiments and modifications are merely examples and are not intended to limit the technical scope of the present invention. Those skilled in the art may modify the disclosed embodiments and modifications as appropriate, and it should be understood that the technical scope of the invention disclosed in this specification also includes such modifications. [Explanation of symbols]

[0058] 1 generator, 10 soft magnetic plate, 20 coil, 30A, 30B permanent magnet, 50 support, 51 screw.

Claims

1. A permanent magnet and A coil and a soft magnetic member disposed within the coil and including a tip portion that displaces in response to an external force between at least a reference position that does not face the permanent magnet and an opposing position that faces the permanent magnet; A power generation device having the above structure.

2. the permanent magnets include a first permanent magnet having a first magnetic pole portion and a second permanent magnet having a second magnetic pole portion having a different magnetic property from the first magnetic pole portion, the tip portion is displaced in response to the external force at least between the reference position and a first opposing position opposing the first magnetic pole portion, and at least between the reference position and a second opposing position opposing the second magnetic pole portion. The power generating device according to claim 1 .

3. an opposing surface of the first permanent magnet that faces a tip surface of the tip portion at the first opposing position is disposed forward of a tip surface of the tip portion at the reference position and above an upper surface of the soft magnetic member with the tip portion at the reference position; an opposing surface of the second permanent magnet that faces the tip surface of the tip portion at the second opposing position is disposed forward of the tip surface of the tip portion at the reference position and below a lower surface of the soft magnetic member with the tip portion at the reference position; The power generating device according to claim 2 .

4. the first permanent magnet is disposed with the tip end portion inclined with respect to the soft magnetic member in the reference position so as to have an opposing surface opposing a tip end surface of the tip end portion in the first opposing position, the second permanent magnet is disposed with the tip end portion inclined with respect to the soft magnetic member in the reference position so as to have an opposing surface opposing the tip end surface of the tip end portion in the second opposing position; The power generating device according to claim 2 .

5. the first permanent magnet is disposed to generate a peripheral magnetic field that is incident perpendicularly to the tip surface of the tip portion at the first opposing position, thereby generating a first in-plane magnetic field in an extension direction of the soft magnetic member, the second permanent magnet is disposed to generate a peripheral magnetic field that is perpendicularly incident on the tip surface of the tip portion at the second opposing position, thereby generating a second in-plane magnetic field in a direction opposite to the first in-plane magnetic field. The power generating device according to any one of claims 2 to 4.

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