Power generation sensor

Abstract

The power generation sensor includes a magnetic wire that exhibits a large Barkhausen effect by an alternating magnetic field applied by a magnetic field generation source, a coil wound around the magnetic wire, and a pair of soft magnetic members magnetically coupled to both ends of the magnetic wire, respectively. A pair of soft magnetic material members is bonded and fixed to each of the two ends of the magnetic conductive wire by means of a soft magnetic resin comprising a resin containing a soft magnetic material. In one embodiment, a pair of soft magnetic members are disposed between a magnetic wire and a magnetic field generation source, and both end portions of the magnetic wire and surfaces of the pair of soft magnetic members that do not face the magnetic field generation source are bonded and fixed by a soft magnetic resin.

Description

[0001] Related applications

[0002] This application claims priority to Japanese Patent Application No. 2023-67425, filed on April 17, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to a power generation sensor that generates power in response to changes in a magnetic field. Background Technology

[0004] Magnetic wires exhibiting the Big Backhausen effect (Big Backhausen jump) are called Wiegand wires or pulse wires. These magnetic wires consist of a core and a skin portion surrounding the core. One of the core and the skin portion is a soft magnetic layer that reverses its magnetization direction even under a weak magnetic field, while the other is a hard magnetic layer whose magnetization direction does not reverse unless a strong magnetic field is applied. By winding a coil around such a magnetic wire, a power generation sensor can be constructed.

[0005] When the hard magnetic layer and the soft magnetic layer are magnetized in the same direction along the axis of the conductor, if the strength of an external magnetic field in the opposite direction to their magnetization direction increases and reaches a certain strength, the magnetization direction of the soft magnetic layer reverses. This reversal of magnetization direction propagates from a portion of the magnetic conductor as a starting point to the entire conductor, and the magnetization direction of the soft magnetic layer reverses simultaneously. At this time, the Big Barkhausen effect occurs, inducing a pulse signal in the coil wound on the magnetic conductor. When the strength of the external magnetic field increases further and reaches a certain strength, the magnetization direction of the hard magnetic layer reverses.

[0006] For the large Barkhausen effect to occur, the magnetization direction of the soft magnetic layer must be reversed only, starting from a state where the magnetization directions of the hard and soft magnetic layers are aligned. When the magnetization directions of the hard and soft magnetic layers are not aligned, even if only the magnetization direction of the soft magnetic layer is reversed, no pulse signal will be generated, or if a pulse signal is generated, it will be extremely small.

[0007] Furthermore, to maximize the obtained power, it is crucial that the magnetization reversal of the soft magnetic layer extends throughout the entire magnetic conductor, starting from a state where the magnetization direction is consistent across the entire conductor. When the magnetization direction of the magnetic conductor is inconsistent across parts, only very small pulse signals can be obtained. Therefore, it is preferable to apply a uniform magnetic field across the entire magnetic conductor.

[0008] As described above, the magnetic properties of a magnetic conductor are formed by applying stress to the conductor during processing such as drawing, heat treatment, and twisting, and leaving that stress residue. Therefore, if other stresses are applied in subsequent processes, unpredictable and unexpected strains will occur inside the magnetic conductor, causing changes in its magnetic properties and making the pulse signal unstable.

[0009] The technology of the power generation sensor is described in patent documents 1-3.

[0010] Patent Document 1 includes a conduit to prevent unpredictable strain on the magnetic conductor. This conduit protects the magnetic conductor from external forces, temperature changes, and vibrations. However, it cannot suppress the counter-magnetic field generated at both ends of the magnetic conductor, nor can it apply a uniform magnetic field to the entire conductor.

[0011] Patent Document 2 discloses a magnetic sensor whose structure involves holding a magnetic wire inside a glass tube to prevent strain on the magnetic wire, and supporting both ends of the glass tube on cylindrical recesses of a guide member made of a soft magnetic material. The document explains how this structure suppresses the counter-magnetic field generated in the magnetic wire, thereby stabilizing the pulse signal output. However, due to the thickness of the glass tube, a gap is created between the magnetic wire and the guide member. This weakens the magnetic coupling between the guide member and the magnetic wire, resulting in low induction efficiency of the magnetic flux collected by the guide member on the magnetic wire, and failing to fully induce the large Barkhausen effect characteristic of the magnetic wire.

[0012] Patent Document 3 discloses a power generation element with a structure comprising two soft magnetic bodies at both ends of a magnetic conductor, which press against the magnetic conductor. The document explains how this structure suppresses the counter-magnetic field generated in the magnetic conductor, thereby stabilizing the pulse signal output. While this structure enhances the magnetic coupling between the soft magnetic bodies and the magnetic conductor, it also applies stress to the conductor by applying pressure to the structural portions of the two soft magnetic bodies. This results in unpredictable strain within the magnetic conductor, altering its magnetic properties and causing pulse signal instability. Furthermore, even when pressure is applied between the magnetic conductor and the soft magnetic bodies to bring them into contact, only partial contact occurs, leaving gaps and preventing sufficient magnetic coupling.

[0013] Existing technical documents

[0014] Patent documents

[0015] Patent Document 1: Japanese Patent No. 7021839

[0016] Patent Document 2: Japanese Patent No. 2598453

[0017] Patent Document 3: International Publication No. 2021 / 200361 Summary of the Invention

[0018] The technical problem that the invention aims to solve

[0019] To apply a parallel-axial magnetic field of uniform strength to the entire magnetic conductor, simply configuring a power generation sensor is insufficient; soft magnetic materials with anti-magnetic field suppression and magnetic field collection functions from the magnetic field generation source are required at both ends of the magnetic conductor. Furthermore, to effectively enhance their functionality, strong magnetic coupling is needed between the magnetic conductor and the soft magnetic material components. In this case, a structure is required to prevent unpredictable and unexpected strain from occurring within the magnetic conductor.

[0020] Patent Document 2's structure avoids accidental stress on the magnetic wire through the glass tube, but it suffers from weakened magnetic coupling. Patent Document 3 discloses a structure that enhances magnetic coupling, but it also suffers from accidental stress on the magnetic wire.

[0021] Therefore, one embodiment of the present invention provides a power generation sensor whose structure does not exert unexpected stress on the magnetic wire and forms a strong magnetic coupling between the magnetic wire and a soft magnetic body component with a magnetizing function.

[0022] Technical solutions to solve technical problems

[0023] One embodiment of the present invention provides a power generation sensor having the features described below.

[0024] 1. A power generation sensor, comprising: a magnetic conductor that exhibits the large Backhausen effect through an alternating magnetic field applied by a magnetic field generating source;

[0025] A coil wound around the magnetic wire; and

[0026] A pair of soft magnetic components, each magnetically coupled to one end of the magnetic wire.

[0027] The pair of soft magnetic components are respectively bonded and fixed to both ends of the magnetic wire using a soft magnetic resin composed of a resin containing soft magnetic materials.

[0028] According to this structure, the magnetic field from the magnetic field generating source is guided to both ends of the magnetic wire through a pair of soft magnetic material components. The two ends of the magnetic wire are bonded and fixed by soft magnetic resin (a resin containing soft magnetic materials). Since the two ends of the magnetic wire are connected to the soft magnetic material components via the soft magnetic resin, the soft magnetic resin enhances the magnetic coupling between them. Therefore, it is possible to suppress the counter-magnetic field at both ends of the magnetic wire and apply its axial magnetic field over a large range along the axial direction of the magnetic wire.

[0029] Furthermore, by using a soft magnetic resin with appropriate hardness (and appropriate flexibility), the magnetic wires can be designed without applying stress. Therefore, the large Backhausen effect can be fully induced, enabling the realization of a power generation sensor capable of acquiring a high output signal. In addition, by placing a flexible resin between the magnetic wires and the soft magnetic components, excellent durability against vibration and temperature changes can be achieved simultaneously.

[0030] 2. The power generation sensor as described in claim 1, wherein the pair of soft magnetic components are configured between the magnetic conductor and the magnetic field generating source.

[0031] The two ends of the magnetic wire and the surfaces of the pair of soft magnetic components that do not face the magnetic field source are bonded and fixed using the soft magnetic resin.

[0032] According to this structure, a pair of soft magnetic components, relative to the magnetic wire, do not have structural portions on the side opposite to the magnetic field source, but have surfaces open to the side not facing the magnetic field source. The two ends of the magnetic wire are bonded and fixed to these surfaces using soft magnetic resin. Therefore, when assembling the power generation sensor, it is unnecessary to insert the magnetic wire into the openings of the soft magnetic components. Furthermore, by using soft magnetic resin for bonding, the magnetic wire and the soft magnetic components can be combined, thus eliminating the need for other components to press the magnetic wire onto the soft magnetic components to bring them into contact. Therefore, a power generation sensor can be provided that achieves mechanical bonding and good magnetic coupling between the magnetic wire and the soft magnetic components without applying unintended strain to the magnetic wire, and exhibits excellent assemblability.

[0033] When the magnetic component has a structural portion on the side opposite to the magnetic conductor and the magnetic field source, such a structural portion does not contribute to the magnetizing function but has the function of strengthening the magnetic coupling with the magnetic conductor. However, according to the structure of the above embodiment that uses soft magnetic resin to strengthen the magnetic coupling between the magnetic conductor and the magnetic component, a structural portion on the side opposite to the magnetic field source is not required.

[0034] 3. The power generation sensor as described in item 1 or 2, wherein the hardness of the soft magnetic resin is below A90 (90 points under a type A hardness tester conforming to JIS K 6253 standard).

[0035] Based on this structure, the soft magnetic resin is an elastic, rubber-like material, thus preventing unexpected strain on the magnetic wires. Furthermore, because it can suppress delamination at the interface between the resin and the magnetic wires and the soft magnetic components, a highly durable power generation sensor can be achieved.

[0036] 4. The power generation sensor as described in any one of claims 1 to 3, wherein the pair of soft magnetic components are made of a soft magnetic material having a coercivity of less than or equal to the coercivity of the magnetic conductor and a relative permeability of 500 or more.

[0037] The soft magnetic resin is a resin made by mixing soft magnetic material powder composed of soft magnetic material powder with a coercivity of less than the coercivity of the magnetic wire and a relative permeability of more than 500.

[0038] The materials described above possess characteristics such as low magnetic resistance, low hysteresis, and low self-induction. Therefore, even when a high-frequency alternating magnetic field is applied, generated when the magnetic field source moves at high speed, the impact on the output characteristics of the power generation sensor is minimal. Specifically, the soft magnetic material is preferably made of Ni-based ferrite or Mn-based ferrite. The soft magnetic material of the soft magnetic component and the soft magnetic material of the soft magnetic powder can be of the same type or different types.

[0039] 5. The power generation sensor as described in item 4, wherein the mixing ratio of the soft magnetic powder in the soft magnetic resin is 50 wt% or more and 90 wt% or less (the lower limit of the range is preferably 55 wt%, more preferably 60 wt%, and the upper limit of the range is preferably 85 wt%, more preferably 80 wt%).

[0040] According to this structure, the soft magnetic resin does not impair the resin properties such as viscosity, hardness, and curing, nor the properties of the soft magnetic powder such as magnetic permeability, coercivity, and magnetic flux density. It has an elastic rubber-like structure and can reliably strengthen the magnetic coupling between the magnetic wire and the soft magnetic component.

[0041] 6. The power generation sensor as described in any one of claims 1 to 5, wherein the pair of soft magnetic components has a cuboid portion (i.e., part or all of which is cuboid).

[0042] With this structure, when the magnetic field source is a magnet, it has the advantage of being able to handle multiple magnetization directions of that magnet.

[0043] Each soft magnetic component can be entirely rectangular in shape, or only partially rectangular. Furthermore, soft magnetic components can be constructed by combining multiple rectangular components.

[0044] 7. The power generation sensor as described in any one of claims 1 to 6, wherein the pair of soft magnetic components have an axially parallel portion extending along the axial direction of the magnetic conductor between the magnetic field generating source and the coil.

[0045] With this structure, the axially parallel portion can have a magnetic shielding function to block magnetic flux toward the axial midpoint of the magnetic wire. Therefore, for example, in the case where the magnetic field source is a multipole magnet, it has the advantage of allowing its magnetization spacing to be smaller than the length of the magnetic wire.

[0046] 8. The power generation sensor as described in any one of claims 1 to 7, wherein the pair of soft magnetic components are configured to be located between the magnetic conductor and the magnetic field generating source, and when viewed from the axial direction of the magnetic conductor, the center of the pair of soft magnetic components is located on a straight line extending from the center of the magnetic conductor toward the magnetic field generating source.

[0047] In other words, assuming a plane passing through the central axis of the magnetic conductor and parallel to the direction of the magnetic conductor toward the magnetic field source, the center of the pair of soft magnetic components is disposed in this plane.

[0048] According to this structure, the alternating magnetic field generated by the magnetic field source collected by the soft magnetic body component is equally induced by the magnetic wire.

[0049] 9. The power generation sensor as described in any one of claims 1 to 8, wherein the pair of soft magnetic components are configured to be located between the magnetic conductor and the magnetic field generating source.

[0050] The two ends of the magnetic wire and the surfaces of the pair of soft magnetic components that do not face the magnetic field source are bonded and fixed using the soft magnetic resin.

[0051] The pair of soft magnetic components have grooves or protrusions extending axially along the magnetic conductor on the surface not facing the magnetic field source.

[0052] This structure allows for easy positioning of the magnetic wires and their bonding to a pair of soft magnetic components. Therefore, a power generation sensor with excellent assemblability can be achieved.

[0053] 10. The power generation sensor as described in any one of claims 1 to 9, further comprising a pair of external terminal electrodes for surface mounting, respectively disposed on the pair of soft magnetic body components facing the magnetic field generation source.

[0054] At least one of the pair of soft magnetic components and the soft magnetic resin is an insulator.

[0055] This structure reduces the number of structural components in the power generation sensor, enabling a simple and compact surface-mount power generation sensor. A pair of soft magnetic components and / or soft magnetic resin serve as insulators, thereby preventing short circuits of the pair of external terminal electrodes via magnetic wires.

[0056] Typically, the two ends of the coil are connected to a pair of external terminal electrodes.

[0057] The above and other objects, features and effects of the present invention will become more apparent from the description of the embodiments with reference to the accompanying drawings and as described below. Attached Figure Description

[0058] Figure 1A This is a perspective view of the power generation sensor based on Implementation Method 1. Figure 1B This is its main view. Figure 1C This is its sectional view.

[0059] Figure 1D It is a cross-sectional view showing the deformation related to the configuration of the soft magnetic resin.

[0060] Figure 2 This is a perspective view of a variation of embodiment 1.

[0061] Figure 3 This is a perspective view showing a variation of embodiment 1, example 2.

[0062] Figure 4A This is a perspective view showing a variation of embodiment 1, Example 3. Figure 4B This is its sectional view.

[0063] Figure 5A It means that it was used. Figure 2 A perspective view of an example device for a power generation sensor.

[0064] Figure 5B It means that it was used Figure 3 A perspective view of an example device for a power generation sensor.

[0065] Figure 5C It means that it was used Figure 4A and Figure 4B A perspective view of an example device for a power generation sensor.

[0066] Figure 6A and Figure 6B The model structure represents the comparison example.

[0067] Figure 7A This is a perspective view of the power generation sensor based on implementation method 2. Figure 7B This is its main view. Figure 7C This is its sectional view.

[0068] Figure 8A This is a perspective view showing a variation of embodiment 2, Example 1. Figure 8B This is its main view. Figure 8C This is its sectional view.

[0069] Figure 9A , Figure 9B and Figure 9C This represents a variation of implementation method 2.

[0070] Figure 9D , Figure 9E , Figure 9F and Figure 9G This represents a variation of implementation method 2.

[0071] Figure 10A and Figure 10B This is a perspective view showing a variation 3 of embodiment 2.

[0072] Figure 11 This is a perspective view showing the structure of the power generation sensor according to Embodiment 3. Detailed Implementation

[0073] The present invention will now be described based on the illustrated embodiments. However, the present invention is not limited to the embodiments described above.

[0074] [Implementation Method 1]

[0075] Figure 1A This is a perspective view of the power generation sensor 100 based on embodiment 1. Figure 1B It is along Figure 1A The main view viewed in the X direction. Figure 1C It is along Figure 1A A cross-sectional view of plane 116 viewed in the Y direction.

[0076] The power generation sensor 100 includes a magnetic wire 110, a coil 120 wound around the magnetic wire 110, and a pair of soft magnetic components 130, 132. The magnetic wire 110 exhibits the large Backhausen effect due to an alternating magnetic field applied by relative motion with a magnetic field generating source 400. The coil 120 is wound around the magnetic wire 110 such that the first end 111 and the second end 112 of the magnetic wire 110 are exposed at the same length. In this embodiment, the coil 120 is wound around the magnetic wire 110 between the pair of soft magnetic components 130, 132. Circular openings 131, 133 larger than the outer diameter of the magnetic wire 110 are formed on the pair of soft magnetic components 130, 132. The first end 111 and the second end 112 of the magnetic wire 110 are respectively inserted into the openings 131, 133. Soft magnetic resin 140 is disposed within openings 131 and 133 (marked with slashes for clarity. The same applies in other figures). The soft magnetic resin 140 is used to bond the first end 111 of the magnetic wire 110 to the inner peripheral surface of the opening 131 of the soft magnetic body component 130, and to bond the second end 112 of the magnetic wire 110 to the inner peripheral surface of the opening 133 of the soft magnetic body component 132.

[0077] The X direction is the direction in which the central axis of the magnetic conductor 110 extends, hereinafter referred to as "axial X". Furthermore, the direction orthogonal to axial X, and in which the magnetic conductor 110 faces the magnetic field generating source 400, is referred to as "axial orthogonal direction Z". The Y direction is orthogonal to both axial X and axial orthogonal direction Z, and corresponds to the width direction of the power generation sensor 100; therefore, it is hereinafter referred to as "width direction Y".

[0078] A pair of soft magnetic components 130, 132 have the same cylindrical (in this example, cylindrical) structure and are configured symmetrically with respect to a plane of symmetry 115 (a virtual plane used to illustrate the geometric configuration) that is orthogonal to the axial X at the center of the magnetic conductor 110.

[0079] As shown in Figure 1, the soft magnetic resin 140 is connected across the entire circumference of the ends 111 and 112 of the magnetic wire 110, and is also connected to the entire inner circumferential surface of the openings 131 and 133 of the soft magnetic body parts 130 and 132. The openings 131 and 133 are circular in this example, but can also be quadrilateral or other shapes.

[0080] The soft magnetic resin 140 is made by mixing soft magnetic powder (powder of soft magnetic material) with resins such as silicone, polyurethane, and epoxy resin. The soft magnetic resin 140 is fluid, for example, in a liquid state (a mixture of soft magnetic powder and resin), before being disposed in the gaps between the openings 131, 133 and the ends 111, 112 of the magnetic wires 110. The soft magnetic resin 140 is cured after being disposed in such a way that it fills the gaps between the openings 131, 133 and the ends 111, 112 of the magnetic wires 110. Thus, the soft magnetic resin 140 fills the gaps between each end 111, 112 of the magnetic wires 110 and each opening 131, 133 of the soft magnetic components 130, 132, bonding them together. The resin contained in the soft magnetic resin 140 can be a resin that cures by solvent evaporation, a resin that cures by ultraviolet radiation (UV-curing resin), or a resin that cures by heating (thermosetting resin). Alternatively, a two-component adhesive can be used to coat the main agent and the curing agent to cure it.

[0081] As a characteristic of the cured resin, the soft magnetic resin 140 preferably has rubber-like elastic properties, and particularly preferably has soft elastic properties with a hardness of A90 or less (90 points on a type A hardness tester conforming to JIS K 6253 standard). Because of these rubber-like elastic properties, even when the soft magnetic components 130 and 132 are assembled on the magnetic wire 110, no stress is applied to the magnetic wire 110. Furthermore, due to the elasticity caused by the resin contained in the soft magnetic resin 140, even under the influence of temperature changes, external forces, vibrations, etc., the soft magnetic resin 140 will not peel off at the interface with the magnetic wire 110 and the soft magnetic components 130 and 132, thus maintaining high durability for the assembled power generation sensor 100.

[0082] The soft magnetic components 130 and 132 are made of a soft magnetic material with a coercivity less than or equal to that of the magnetic conductor 110 and a relative permeability of 500 or higher. The soft magnetic powder contained in the soft magnetic resin 140 is also made of the same soft magnetic material. This material has characteristics such as low magnetic resistance, low hysteresis, and low self-induction. Therefore, even when a high-frequency alternating magnetic field generated when the magnetic field generating source 400 moves at high speed is applied, the impact on the output characteristics of the power generation sensor 100 is minimal. Specifically, the soft magnetic components 130 and 132 and the soft magnetic powder are preferably made of Ni-based ferrite or Mn-based ferrite materials.

[0083] The mixing ratio of the soft magnetic powder in the soft magnetic resin 140 is preferably 50 wt% or more and 90 wt% or less. If this mixing ratio is set within this range, the resin properties (viscosity, hardness, curing time, etc.) and the soft magnetic powder properties (permeability, coercivity, magnetic flux density, etc.) will retain their respective characteristics after curing. The lower limit of the above range is more preferably 55 wt%, and even more preferably 60 wt%. The upper limit of the above range is more preferably 85 wt%, and even more preferably 80 wt%.

[0084] The soft magnetic resin 140 is placed between the magnetic wire 110 and the soft magnetic components 130 and 132, thereby enhancing the magnetic coupling between them. As a result, the reverse magnetic field at both ends of the magnetic wire 110 is suppressed, and the magnetic field collected by the soft magnetic components 130 and 132 can be induced along the axial X of the magnetic wire 110 over a large range.

[0085] The positional relationship between a pair of soft magnetic components 130, 132 and the two ends 111, 112 of the magnetic wire 110 is explained. The pair of soft magnetic components 130, 132 are positioned between the magnetic wire 110 and the magnetic field source 400, when viewed from the axial X-axis of the magnetic wire (refer to...). Figure 1BThe center of a pair of soft magnetic components 130 and 132 is located on a straight line (surface 116) drawn from the center of the magnetic wire 110 toward the direction facing the magnetic field source 400, i.e., the orthogonal direction Z.

[0086] More specifically, consider the plane 116 (a virtual plane for illustrating the geometric configuration) which is parallel to the direction facing the magnetic field source 400, i.e., the axial orthogonal direction Z (the direction orthogonal to the axial direction X of the magnetic conductor 110) and passes through the radial center of the magnetic conductor 110 (containing the central axis of the magnetic conductor 110).

[0087] The two ends 111 and 112 of the magnetic conductor 110 are disposed on the surface 116. The relative arrangement of the magnetic conductor 110 and the soft magnetic body components 130 and 132 is configured such that the surface 116 passes through the center of the pair of soft magnetic body components 130 and 132. Specifically, when viewed along the axial X... Figure 1B In this configuration, the magnetic conductor 110 is located at half the width w (width in the Y direction) of the soft magnetic components 130 and 132. By positioning the two ends 111 and 112 of the magnetic conductor 110 at this location, the magnetic flux collected from the magnetic field source 400 is uniformly induced into the magnetic conductor 110. The center of each soft magnetic component 130 and 132 can be the center of gravity assuming that each soft magnetic component 130 and 132 is homogeneous (this assumption is generally reasonable).

[0088] Additionally, in the illustrated example, the ends 111 and 112 of the magnetic wire 110 protrude from the soft magnetic body components 130 and 132, but the ends 111 and 112 may not protrude from the soft magnetic body components 130 and 132. Furthermore, in the illustrated example, the soft magnetic resin 140 spans the entire length L of the soft magnetic body components 130 and 132 in the axial direction X, but the soft magnetic resin 140 may also be disposed within an opening covering a portion of the axial dimension L. Furthermore, as... Figure 1D As shown, the soft magnetic resin 140 can also be a structure that covers the ends 111 and 112 of the magnetic wire 110 and fills a portion of the openings 131 and 133. The same applies in the variations described below.

[0089] [Modification 1 of Implementation Method 1]

[0090] Figure 2 A variation 1 of Embodiment 1 is shown. The soft magnetic components 130 and 132 of Embodiment 1 are cylindrical, but as... Figure 2As shown in the power generation sensor 100a, the soft magnetic components 130a and 132a can also be constructed of cuboids. Similar to Embodiment 1, the soft magnetic components 130a and 132a have circular openings 131a and 133a larger than the outer diameter of the magnetic wire 110. The first end 111 and the second end 112 of the magnetic wire are respectively inserted into these openings 131a and 133a. Soft magnetic resin 140 is disposed within the openings 131a and 133a, and through this resin 140, the first end 111 of the magnetic wire 110 is bonded to the opening 131a of the soft magnetic component 130a, and the second end 112 of the magnetic wire 110 is bonded to the opening 133a of the soft magnetic component 132a. Thus, the two ends 111 and 112 of the magnetic wire 110 and the pair of soft magnetic components 130a and 132a are bonded and fixed together.

[0091] Similar to Embodiment 1, the magnetic conductor 110 is located at half the width dimension w (the dimension in the width direction Y) of the soft magnetic body components 130a and 132a. That is, the plane passing through the central axis of the magnetic conductor 110 and parallel to the orthogonal direction Z (refer to plane 116 in Figure 1) passes through the center (typically, the center of gravity) of the soft magnetic body components 130a and 132a.

[0092] The cuboid shape of the soft magnetic components 130a and 132a is a shape that makes the width dimension w (the dimension in the width direction Y) of the magnetic pole surface parallel to the magnetic field source 400 and perpendicular to the axis X of the magnetic wire 110 longer than the dimension h in the direction facing the magnetic field source 400, i.e., the orthogonal direction Z.

[0093] [Modification 2 of Implementation Method 1]

[0094] Figure 3 A variation 2 of Embodiment 1 is shown. The shape of the soft magnetic material component differs from that of the power generation sensor 100a in Embodiment 1. More specifically, in this variation 2, the soft magnetic material components 130b and 132b are cuboids whose dimension h in the direction facing the magnetic field source 400 (i.e., the orthogonal direction Z) is longer than the width w (dimension in the width direction Y) of the axis parallel to the magnetic pole face of the magnetic field source 400 and perpendicular to the axial direction X of the magnetic wire 110. Compared with Embodiment 1 (… Figures 1A to 1D ) and variation example 1 ( Figure 2Similarly, the magnetic conductor 110 is located at half the width dimension w of the soft magnetic components 130b and 132b. That is, the plane passing through the central axis of the magnetic conductor 110 and parallel to the orthogonal direction Z (refer to plane 116 in Figure 1) passes through the center (typically, the center of gravity) of the soft magnetic components 130b and 132b. On the other hand, the positions of the openings 131b and 133b of the soft magnetic components 130b and 132b in the orthogonal direction Z are offset relative to the center of dimension h towards the opposite side of the magnetic field generating source 400.

[0095] [Modification 3 of Implementation Method 1]

[0096] Figure 4A and Figure 4B A variation 3 of embodiment 1 is shown. The soft magnetic components 130c and 132c of the power generation sensor 100c shown in variation 3 have: [the following is a description of the soft magnetic components 130c and 132c of the power generation sensor 100b in variation 2] Figure 3 The soft magnetic components 130b and 132b have corresponding orthogonal portions 134; and parallel portions 135 extend along the axial direction X of the magnetic wire 110 on the side of the magnetic field source 400 and outside the outer diameter of the coil 120. In this example, the cuboid-shaped parallel portions 135 are connected to the front end of the cuboid-shaped orthogonal portions 134 on the side of the magnetic field source 400, forming L-shaped soft magnetic components 130c and 132c. The orthogonal portions 134 have a dimension L in the axial direction X. The parallel portions 135 of the pair of soft magnetic components 130c and 132c extend from the orthogonal portions 134 toward each other along the axial direction X by a dimension L′. A gap of size L″ is formed between the near ends of the axially parallel portions 135 at the center position in the axial direction X. The axially parallel portions 135 have a magnetic shielding function to prevent the magnetic field from the magnetic field generating source 400 from entering the middle part of the magnetic wire 110 in the axial direction X, a magnetic collection function to collect the magnetic field from the magnetic field generating source 400, and a magnetic induction function to guide the magnetic field after collection to the ends 111, 112 of the magnetic wire 110 via the axially orthogonal portions 134. The openings 131c, 133c of the soft magnetic body parts 130c, 132c are offset in the axially orthogonal direction Z from the center of size h towards the opposite side of the magnetic field generating source 400.

[0097] Figure 5A , Figure 5B and Figure 5C Examples of devices using power generation sensors 100a, 100b, and 100c, respectively, are shown. These devices use a magnetic field generating source 400 as magnets 410, 420, and 430, and are configured as encoder devices in which the magnets 410, 420, and 430 move relative to each other (in this example, linearly) the magnetic conductors 110 of the power generation sensors 100a, 100b, and 100c in the axial direction X.

[0098] Figure 5A This is a perspective view of the encoder device using the power generation sensor 100a of Modified Example 1. The magnetic field generating source 400, i.e., the magnet 410, is a multipole magnet magnetized along the width direction Y. Since the pair of soft magnetic body parts 130a and 132a of the power generation sensor 100a extend relatively long in the width direction Y, the magnetizing effect of the soft magnetic body parts 130a and 132a is improved for the magnet 410 magnetized in the width direction Y. Therefore, it has the advantage of being thinner and smaller than the orthogonal direction Z of the axis. In addition, in order to prevent each soft magnetic body part 130a and 132a from simultaneously facing the N pole and S pole of the magnet 410, the power generation sensor 100a needs to be offset relative to the magnet 410 in the width direction Y.

[0099] Figure 5B This is a perspective view of the encoder device using the power generation sensor 100b of Modified Example 2. The magnetic field generating source 400, i.e., the magnet 420, is a multipole magnet magnetized along the orthogonal direction Z. Since the pair of soft magnetic components 130b and 132b of the power generation sensor 100b extend relatively long in the orthogonal direction Z, the magnetizing effect is improved for the magnet 420 magnetized in this direction. Therefore, it has the advantage of being smaller in size relative to the width direction Y.

[0100] Figure 5C This is a perspective view of the encoder device using the power generation sensor 100c of Modified Example 3. The magnetic field generating source 400, i.e., the magnet 430, is a multipole magnet magnetized in the orthogonal direction Z. The pair of soft magnetic body components 130c and 132c of the power generation sensor 100c are L-shaped, with an axially parallel portion 135 on the side facing the magnet 430 in the orthogonal direction Z. The soft magnetic body components 130c and 132c have a better magnetizing effect than the magnet 430 magnetized in the orthogonal direction Z. Therefore, it has the advantage of being smaller in size relative to the width direction Y.

[0101] Furthermore, unlike the power generation sensor 100b, because the soft magnetic components 130c and 132c form an L-shape, the area of ​​the soft magnetic components 130c and 132c facing the magnet 430 is larger. Therefore, in addition to the magnetizing function, the shielding function will also be effective. Thus, as... Figure 5B As shown, in the power generation sensor 100b, the magnetization spacing λ (between the centers of the N and N poles) of the magnet 420 needs to be greater than the length Lw of the magnetic wire 110, but in the case of the power generation sensor 100c, as Figure 5CAs shown, the magnetization spacing λ of magnet 430 can be designed to be greater than or equal to the gap size L″ between a pair of soft magnetic components 130c and 132c, and the length Lw of magnetic wire 110 can also be less than or equal to that of magnet 420 and 430. Therefore, when magnets 420 and 430 move the same distance relative to power generation sensors 100b and 100c, Figure 5C The number of pulse signals output by the generator sensor 100c of the encoder device is higher than that of the generator sensor 100c. Figure 5B The encoder device's generator sensor 100b outputs a larger number of pulse signals. In other words, it can perform position detection with higher resolution.

[0102] [Model]

[0103] To facilitate understanding of the following description of Implementation Method 2, the following explanation is provided. Figure 6A and Figure 6B The model structure (comparative example) is shown below. The power generation sensor 200 includes a magnetic wire 110, a coil 120 wound around the magnetic wire 110, and a pair of rectangular soft magnetic body parts 230, 233. The magnetic wire 110 exhibits the large Backhausen effect due to the magnetic field applied by the relative motion with the magnetic field generating source 400. The coil 120 is wound around the magnetic wire 110 such that the first end 111 and the second end 112 of the magnetic wire 110 are exposed at the same length. In this model, the coil 120 is wound around the magnetic wire 110 between the pair of soft magnetic body parts 230, 233. The pair of soft magnetic body parts 230, 233 form a circular opening with the same outer diameter as the magnetic wire 110, and the first end 111 and the second end 112 of the magnetic wire are respectively inserted into the opening.

[0104] When a pair of soft magnetic components 230 and 233 are divided by a virtual surface containing the central axis of the magnetic conductor 110 and extending along the width direction Y, the soft magnetic components 230 and 233 are divided into portions 22 and 25 facing the magnetic field source 400 and portions 21 and 24 not facing the magnetic field source 400. In this case, portions 21 and 24 not facing the magnetic field source 400 do not have the function of collecting the magnetic field from the magnetic field source 400, but they contribute to the magnetic coupling between the soft magnetic components 230 and 233 and the magnetic conductor 110. Without portions 21 and 24 not facing the magnetic field source 400, the magnetic coupling between portions 22 and 25 facing the magnetic field source 400 and the magnetic conductor 110 is narrower and smaller, which may cause the pulse signal to be unstable due to the large Backhausen effect.

[0105] [Implementation Method 2]

[0106] Figure 7A This is a perspective view of the power generation sensor 200a based on embodiment 2. Figure 7B This is the front view viewed along the X-axis. Figure 7C It is observed along the width direction Y. Figure 7A A sectional view of the section of face 116.

[0107] The power generation sensor 200a includes a magnetic wire 110, a coil 120 wound around the magnetic wire 110, and a pair of soft magnetic components 232, 235. The magnetic wire 110 exhibits the large Backhausen effect due to the magnetic field applied by relative motion with a magnetic field generating source 400. The coil 120 is wound around the magnetic wire 110 such that a first end 111 and a second end 112 of the magnetic wire 110 are exposed at the same length. In this embodiment, the coil 120 is wound around the magnetic wire 110 between a pair of soft magnetic components 232, 235. The pair of soft magnetic components 232, 235 are located between the magnetic wire 110 and the magnetic field generating source 400. The first end 111 and the second end 112 of the magnetic wire 110 are disposed on the surfaces 238 and 239 of the pair of soft magnetic components 232 and 235 that are not facing the magnetic field source 400, and are respectively bonded and fixed to the pair of soft magnetic components 232 and 235 by soft magnetic resin 140.

[0108] A pair of soft magnetic components 232 and 235 have the same cuboid structure and are symmetrically configured with respect to a plane of symmetry 115 (a virtual plane for illustrating the geometric configuration) orthogonal to the axial X at the center of the magnetic conductor 110 along the axial X. Considering a plane 116 (a virtual plane for illustrating the geometric configuration) parallel to the direction facing the magnetic field source 400, i.e., the axially orthogonal direction Z, and passing through the radial center of the magnetic conductor 110 (containing the central axis of the magnetic conductor 110), the centers (typically the centroids) of the pair of soft magnetic components 232 and 235 are located on plane 116. Specifically, in Figure 7B In the middle, the magnetic wire 110 is located at 1 / 2 of the width dimension w (the dimension in the width direction Y) of the soft magnetic body parts 232 and 235.

[0109] A coating having the thickness of soft magnetic resin 140 spans part or all of the faces 238, 239 of a pair of soft magnetic body parts 232, 235 that are not facing the magnetic field source 400, and fills the gap between the faces 238, 239 and the ends 111, 112 of the magnetic wire 110, covering the ends 111, 112 of the magnetic wire 110 across the entire circumference.

[0110] A coating of soft magnetic resin 140 thickness is placed between the magnetic wire 110 and the soft magnetic components 232 and 235, thereby enhancing the magnetic coupling between them. Correspondingly, the reverse magnetic field at both ends of the magnetic wire 110 is suppressed, and the magnetic flux collected by the soft magnetic components 232 and 235 can induce a magnetic field along the axial direction X of the magnetic wire 110 over a large range. Furthermore, since the soft magnetic resin 140 is elastic, even when the soft magnetic components 232 and 235 are assembled on the magnetic wire 110, no unexpected stress is applied to the magnetic wire 110. In addition, even under conditions such as temperature changes, external forces, and vibrations, the soft magnetic resin 140 will not peel off at the interface with the magnetic wire 110 and the soft magnetic components 232 and 235, thus maintaining high durability as an assembly of the power generation sensor 200a.

[0111] One advantage of Embodiment 2 lies in its assembly process. An example of the assembly process includes inserting the magnetic wire 110 into the coil 120, positioning the two ends 111, 112 of the magnetic wire 110 at predetermined positions on the surfaces 238, 239 of a pair of soft magnetic body parts 232, 235, and then coating the two ends 111, 112 of the magnetic wire 110 with soft magnetic resin 140 by casting, printing, transfer, etc.

[0112] On the other hand, an example of the assembly process of the power generation sensor 100 in Embodiment 1 includes the process of inserting the magnetic wire 110 into the coil 120, the process of inserting the magnetic wire 110 into the openings 131 and 133 of the soft magnetic body parts 130 and 132, and the process of injecting the soft magnetic resin 140 into the openings 131 and 133 before or after the process.

[0113] The soft magnetic components 232 and 235 in Embodiment 2 differ from the model in FIG. 6. They lack structural portions corresponding to the portions 21 and 24 on the side not facing the magnetic field source 400, and are configured to be open to the side not facing the magnetic field source 400. Therefore, in Embodiment 2, it is not necessary to insert the magnetic wire 110 into the opening. Furthermore, since no other components are needed to press the magnetic wire 110 against the soft magnetic component to make it contact, assembly becomes easier. Accordingly, a power generation sensor that reduces manufacturing costs can be provided.

[0114] [Modification 1 of Implementation Method 2]

[0115] Figure 8A , Figure 8B and Figure 8C A variation of embodiment 2 is shown. Figure 8A , Figure 8B and Figure 8C They are respectively with Figure 7A , Figure 7Band Figure 7C The same 3D view, front view, and sectional view.

[0116] The assembly process of this modified example 1 differs from that of embodiment 2, and correspondingly, the structure differs. In this modified example 1, soft magnetic resin 140 is first applied to the surfaces 238 and 239 of a pair of soft magnetic components 232 and 235 by casting, printing, transfer, or the like. Then, the two ends 111 and 112 of the magnetic wire 110 are placed on the soft magnetic resin 140. A film having the thickness of the soft magnetic resin 140 is connected to the area of ​​approximately half a circumference of the outer periphery of the ends 111 and 112 of the magnetic wire 110, and is connected across part or all of the surfaces 238 and 239 of the pair of soft magnetic components 232 and 235 that are not facing the magnetic field source 400. In this way, a portion of the ends 111 and 112 of the magnetic wire 110 can also be exposed from the soft magnetic resin 140. The soft magnetic resin 140 spans most (preferably all) of the axial dimension L of the ends 111 and 112 of the magnetic wire 110, effectively utilizing this region for magnetic coupling, thus effectively performing both magnetic coupling and stress suppression functions. In this structure, assembly is easier because the soft magnetic resin 140 is pre-positioned.

[0117] [Modification 2 of Implementation Method 2]

[0118] Figure 9A , Figure 9B , Figure 9C , Figure 9D , Figure 9E , Figure 9F and Figure 9G A variation of embodiment 2 is shown.

[0119] Figure 9A Showing a 3D diagram, Figure 9B In the power generation sensor 200b shown in the front view along the X-axis, instead of the pair of soft magnetic body components 232, 235 of Embodiment 2, a pair of soft magnetic body components 232b, 235b are used. These components have grooves 236b, 237b with semi-circular (U-shaped) cross-sections extending along the X-axis of the magnetic conductor 110 on surfaces 238, 239 that are not facing the magnetic field source 400. The relative arrangement of the magnetic conductor 110 and the soft magnetic body components 232b, 235b is configured such that a surface 116 (a virtual plane used to illustrate the geometric arrangement) parallel to the direction facing the magnetic field source 400, i.e., the orthogonal direction Z, and passing through the radial center (including the central axis) of the magnetic conductor 110, passes through the center (typically the center of gravity) of the pair of soft magnetic body components 232b, 235b. Accordingly, the semi-circular cross-section grooves 236b, 237b extending along the X-axis of the magnetic conductor 110 are arranged on surface 116. Specifically, in Figure 9BIn the middle, the slots 236b and 237b are located at 1 / 2 of the width dimension w (the dimension in the width direction Y) of the soft magnetic body parts 232b and 235b.

[0120] The slot can also be Figure 9C The triangular (V-shaped) grooves 236c, 237c, or shown are... Figure 9D The cross-section shown includes quadrangular (U-shaped) grooves 236d and 237d.

[0121] Furthermore, such as Figure 9E As shown, a pair of protrusions 261 that protrude from surfaces 238 and 239 in the orthogonal direction Z and extend along the axial direction X can also be arranged parallel to each other at intervals in the width direction Y, forming grooves 236e and 237e between them.

[0122] Figures 9B to 9E The opening width dimension g (dimension in the width direction Y) of each of the grooves 236b, 237b; 236c, 237c; 236d, 237d; 236e, 237e shown is above the outer diameter of the magnetic wire 110. These structures have the advantage of easily positioning the two ends 111, 112 of the magnetic wire 110. The depth dimension t (dimension in the orthogonal direction Z) of the grooves 236b, 237b; 236c, 237c; 236d, 237d; 236e, 237e is not particularly limited as long as it does not impair the positioning function.

[0123] exist Figure 9E In the structure, the protrusion 261 can be a single piece, which can achieve the positioning purpose of the magnetic wire 110. However, the structure with two protrusions 261 has the advantage of enhancing the magnetic coupling between the soft magnetic components 232b and 235b and the magnetic wire 110.

[0124] like Figure 9F As shown, the thick coating of the soft magnetic resin 140 can cover the outer periphery of the ends 111, 112 of the magnetic wire 110 along its entire circumference and can extend across the interior of the groove 236b of the pair of soft magnetic body components 232b. Or as... Figure 9G As shown, a coating with a thickness of soft magnetic resin 140 can be located between the region approximately half a circumference below the outer periphery of the ends 111, 112 of the magnetic wire 110 and the inner surface of the groove 236b of the pair of soft magnetic body parts 232b, 235b. Regardless of the structure, the soft magnetic resin 140 can perform magnetic coupling and stress suppression functions.

[0125] [Modification 3 of Implementation Method 2]

[0126] Implementation 2 can also have the same structure as a variation of Implementation 1. Figure 10AA power generation sensor 200c is shown as a variation of embodiment 2, Example 3. Figure 10B Another power generation sensor 200d is shown in variation 3 of embodiment 2.

[0127] Figure 10A The pair of soft magnetic components 240 and 241 of the power generation sensor 200c are cuboids whose dimension h facing the magnetic field source 400, i.e., the orthogonal direction Z, is longer than the width dimension w (the dimension in the width direction Y) of the magnetic pole surface parallel to the magnetic field source 400 and perpendicular to the axial direction X of the magnetic wire 110.

[0128] Figure 10B The soft magnetic components 250 and 251 of the power generation sensor 200d have orthogonal portions 254 that connect to both ends of the magnetic wire 110, and parallel portions 255 that extend along the axial direction X of the magnetic wire 110 on the side of the magnetic field source 400 and outside the outer diameter of the coil 120. In this example, the cuboid-shaped parallel portions 255 are connected to the front end of the cuboid-shaped orthogonal portions 254 on the side of the magnetic field source 400, forming L-shaped soft magnetic components 250 and 251. The orthogonal portions 254 have a dimension L in the axial direction X. The parallel portions 255 of a pair of soft magnetic components 130c and 132c extend from the orthogonal portions 254 toward each other along the axial direction X by a dimension L′. A gap of dimension L″ is formed between the proximal ends of the parallel portions 255 at the center position in the axial direction X.

[0129] When these two power generation sensors 200c and 200d are used in the encoder device, the same advantages as in the variation of Embodiment 1 can be obtained (see [reference]). Figure 5B and Figure 5C ).

[0130] In the explanatory figures of Embodiment 2 and its variations, the ends 111 and 112 of the magnetic wire 110 are exposed from the soft magnetic body components 232, 235; 232b, 235b; 240, 241; 250, 251, but the ends 111 and 112 may not be exposed from the soft magnetic body components 232, 235; 232b, 235b; 240, 241; 250, 251.

[0131] [Implementation Method 3]

[0132] When the pair of soft magnetic components of the power generation sensor are cuboid or L-shaped, the plane can be used as a surface mounting area because it has a flat surface on the side facing the magnetic field source.

[0133] Figure 11This is a perspective view illustrating the structure of the power generation sensor 300 according to Embodiment 3. The structural components used in the description of Embodiment 3 are variations of Embodiment 2 (see Figure 3). Figure 10B The reference number corresponding to the structural part of ).

[0134] In the power generation sensor 300 of this embodiment, external terminal electrodes capable of surface mounting are directly disposed on the soft magnetic body components 250 and 251. The external terminal electrodes are composed of lead frames 310 and 311. The lead frames 310 and 311 are shaped to match the shape of the soft magnetic body components 250 and 251.

[0135] More specifically, the lead frames 310 and 311 are substantially symmetrically configured with respect to a plane of symmetry 115 (a virtual plane used to illustrate the geometric configuration) orthogonal to the axial X at the center of the magnetic conductor 110. The lead frames 310 and 311 include a side portion 312 orthogonal to the axial X along the outer surface of the soft magnetic body parts 250 and 251, a flat top portion 313 extending from one edge of the side portion 312 along the surfaces 238 and 239 where the magnetic conductor 110 is disposed toward the axial X inward, and a flat bottom portion 314 extending along the surfaces 256 and 257 facing the magnetic field source toward the axial X inward, having a transverse U-shaped structure.

[0136] The lead frames 310 and 311 are designed to avoid the coating area of ​​the soft magnetic resin 140, which is applied through casting, printing, transfer, or other coating processes. This structure ensures that the function of the soft magnetic resin 140 in magnetically coupling the soft magnetic components 250 and 251 to the magnetic wire 110 is not impaired. On the surfaces 238 and 239 of the soft magnetic components 250 and 251 where the magnetic wire 110 is disposed, on the exposed surface of the top surface 313 of the lead frames 310 and 311, the terminal wires 121 and 122 of the coil 120 are connected to the lead frames 310 and 311 by solder or resistance welding.

[0137] Therefore, by bonding the flat bottom surface 314 of the lead frames 310, 311 on the side facing the magnetic field source to a printed circuit board or the like, surface mounting of the power generation sensor 300 can be achieved. In this way, by using the lead frames 310, 311, which directly contact the soft magnetic components 250, 251, to form external terminal electrodes, a power generation sensor 300 with a reduced number of components, a simple structure, and the ability to be surface mounted in a small size can be provided.

[0138] While an example of external terminal electrodes consisting of lead frames 310 and 311 is shown, external terminal electrodes can also be formed from plating, conductive paste, solder layers, etc. When the magnetic wire 110 is a conductor, the soft magnetic component and / or soft magnetic resin are insulators because the external terminal electrodes are in direct contact with the soft magnetic component. Specifically, the soft magnetic material of the soft magnetic powder in the soft magnetic component and / or soft magnetic resin is preferably Ni-based ferrite.

[0139] exist Figure 11 In this structure, since the soft magnetic resin 140 is in contact with the lead frames 310 and 311, both the soft magnetic components 250 and 251 and the soft magnetic resin 140 should be insulators. However, if at least one of the soft magnetic components 250 and 251 and the soft magnetic resin 140 is an insulator, then the lead frames 310 and 311 are insulated from the magnetic wire 110, even if the soft magnetic resin 140 is not in contact with the lead frames 310 and 311. The same applies when the external terminal electrodes are formed using conductive layers such as plating.

[0140] In the above description, a linear encoder device was described as an example of an encoder device using a power generation sensor, but the power generation sensor of the present invention can also be applied to a rotary encoder device that detects the rotational motion of a magnet.

[0141] Although the embodiments of the present invention have been described in detail, these are merely specific examples used to illustrate the technical content of the present invention. The present invention should not be construed as being limited to these specific examples, and the scope of the present invention is limited only by the appended claims.

[0142] Label Explanation

[0143] 100, 100a, 100b, 100c: Power generation sensors

[0144] 110: Magnetic wire

[0145] 111: First end

[0146] 112: Second end

[0147] 116: Noodles

[0148] 120: Coil

[0149] 130, 130a, 130b, 130c: Soft magnetic components

[0150] 131, 131a, 131b: Openings

[0151] 132, 132a, 132b, 132c: Soft magnetic components

[0152] 133, 133a, 133b: Openings

[0153] 134: Orthogonal part of the axis

[0154] 135: Parallel section of shaft

[0155] 140: Soft magnetic resin

[0156] 200, 200a, 200b, 200c, 200d: Power generation sensors

[0157] 230, 232, 232b, 233, 235, 235b: Soft magnetic components

[0158] 236b, 236c, 236d, 236e, 237b, 237c, 237d, 237e: slots

[0159] 238, 239: Noodles

[0160] 240, 241, 250, 251: Soft magnetic components

[0161] 254: Orthogonal part of the axis

[0162] 255: Parallel section of shaft

[0163] 261: Protrusion

[0164] 300: Power Generation Sensor

[0165] 310, 311: Lead frame

[0166] 400: Magnetic field source

[0167] 410, 420, 430: Magnets

[0168] X: Axial direction

[0169] Y: Width direction

[0170] Z: Orthogonal direction to the axis.

Claims

1. A power generation sensor, characterized in that, include: A magnetic conductor that exhibits the large Backhausen effect through an alternating magnetic field applied by a magnetic field generator. A coil wound around the magnetic wire; and A pair of soft magnetic components, each magnetically coupled to one end of the magnetic wire. The pair of soft magnetic components are respectively bonded and fixed to both ends of the magnetic wire using a soft magnetic resin composed of a resin containing soft magnetic materials.

2. The power generation sensor as described in claim 1, characterized in that, The pair of soft magnetic components are configured to be located between the magnetic conductor and the magnetic field generating source. The two ends of the magnetic wire and the surfaces of the pair of soft magnetic components that do not face the magnetic field source are bonded and fixed using the soft magnetic resin.

3. The power generation sensor as described in claim 1 or 2, characterized in that, The hardness of the soft magnetic resin is below A90 on a hardness tester.

4. The power generation sensor as described in any one of claims 1 to 3, characterized in that, The pair of soft magnetic components are made of a soft magnetic material with a coercivity below that of the magnetic conductor and a relative permeability of 500 or more. The soft magnetic resin is a resin made by mixing soft magnetic material powder composed of soft magnetic material powder with a coercivity of less than the coercivity of the magnetic wire and a relative permeability of more than 500.

5. The power generation sensor as described in claim 4, characterized in that, The mixing ratio of the soft magnetic powder in the soft magnetic resin is more than 50 wt% and less than 90 wt%.

6. The power generation sensor as described in any one of claims 1 to 5, characterized in that, The pair of soft magnetic components have a cuboid portion.

7. The power generation sensor as described in any one of claims 1 to 6, characterized in that, The pair of soft magnetic components have an axially parallel portion extending along the axial direction of the magnetic conductor between the magnetic field generating source and the coil.

8. The power generation sensor as described in any one of claims 1 to 7, characterized in that, The pair of soft magnetic components are configured to be located between the magnetic conductor and the magnetic field source. When viewed from the axial direction of the magnetic conductor, the center of the pair of soft magnetic components is located on a straight line drawn from the center of the magnetic conductor toward the magnetic field source.

9. The power generation sensor as described in any one of claims 1 to 8, characterized in that, The pair of soft magnetic components are configured to be located between the magnetic conductor and the magnetic field generating source. The two ends of the magnetic wire and the surfaces of the pair of soft magnetic components that do not face the magnetic field source are bonded and fixed using the soft magnetic resin. The pair of soft magnetic components have grooves or protrusions extending axially along the magnetic conductor on the surface not facing the magnetic field source.

10. The power generation sensor as described in any one of claims 1 to 9, characterized in that, It also includes a pair of external terminal electrodes that are respectively disposed on the surfaces of the pair of soft magnetic components in a manner facing the magnetic field generating source. At least one of the pair of soft magnetic components and the soft magnetic resin is an insulator.

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