Composite magnetic member, power generation element, power generation system, and encoder

Abstract

Deviation in the amount of power generated by a power generation element is reduced. A composite magnetic member (101) is provided with: a magnetic member (110) which generates a large Barkhausen effect by a change in an external magnetic field, and which has a linear shape extending in a first direction (D1); two magnetism collecting members (150) which are spaced apart from each other and arranged side by side in the first direction (D1), and which are provided with an opening (151) into which a part of the magnetic member (110) is inserted; and a resin member (170) that fixes the magnetic member (110) and the two magnetism collecting members (150). The resin member (170) has a first covering portion (171) that covers the outer peripheral surface (111) of the magnetic member (110) at least between the two magnetism collecting members (150). A space (135) in which the coil (130) is disposed is provided between the two magnetic collection members (150).

Description

Technical Field

[0001] This disclosure relates to composite magnetic components, power generation elements, power generation systems, and encoders. Background Technology

[0002] Conventionally, in encoders used for detecting the rotation of motors, etc., encoders employing a power generation element utilizing the large Barkhausen effect are known to detect rotation without the use of batteries (e.g., Patent Document 1). Such a power generation element, for example, has a structure in which a coil is wound around a magnetic component that generates the large Barkhausen effect. The magnetic flux density of the magnetic component generating the large Barkhausen effect changes drastically due to changes in the external magnetic field, thus generating electricity in the coil wound around the magnetic component due to this drastic change in magnetic flux density.

[0003] Furthermore, in such power generation elements, power generation performance can be improved by providing a magnetic collecting member at the end of the magnetic member. For example, Patent Document 2 discloses a power generation element in which a magnetic member is inserted into an insertion portion of the magnetic collecting member and the magnetic member contacts the magnetic collecting member at the insertion portion.

[0004] [Existing Technical Documents]

[0005] [Patent Literature]

[0006] Patent Document 1: Japanese Patent No. 6647478

[0007] Patent Document 2: Japanese Patent No. 7109713 Summary of the Invention

[0008] In power generation elements that use magnetic components that generate the large Barkhausen effect, as described above, small deviations in power generation are required. For example, when power generation elements are used in encoders, large deviations in power generation reduce the accuracy of detecting motor rotation and other phenomena.

[0009] This disclosure was made to solve such a problem, and its purpose is to provide a composite magnetic component that can reduce the deviation of the power generation of a power generation element, a power generation element using the composite magnetic component, a power generation system, and an encoder.

[0010] To achieve the above objectives, one embodiment of the present disclosure comprises: a magnetic component that generates a large Backhausen effect through a change in an external magnetic field, and is linear in shape extending in a first direction; two magnetizing components that are separated from each other and arranged along the first direction, each having an opening for inserting a portion of the magnetic component; and a resin component that fixes the magnetic component and the two magnetizing components, the resin component having a first covering portion that covers the outer peripheral surface of the magnetic component at least between the two magnetizing components, and a space for arranging a coil is provided between the two magnetizing components.

[0011] Alternatively, another embodiment of the power generation element disclosed herein includes: the aforementioned composite magnetic member; and a coil wound around the magnetic member with respect to the first cover portion.

[0012] Furthermore, another aspect of the power generation system disclosed herein includes: the aforementioned power generation element; and a magnetic field applying unit that applies a magnetic field to the power generation element and repeatedly reverses the direction of the magnetic field applied to the power generation element, wherein the power generation element generates electricity by reversing the direction of the magnetic field achieved by the magnetic field applying unit.

[0013] In addition, another aspect of the encoder disclosed herein includes the aforementioned power generation system, wherein the power generation element outputs electricity generated by reversing the direction of the magnetic field achieved by the magnetic field application unit.

[0014] According to this disclosure, it is possible to reduce the deviation in the amount of electricity generated in the power generation element. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view showing the schematic structure of the encoder in the embodiment.

[0016] Figure 2 This is a top view of the magnet in the encoder of the embodiment.

[0017] Figure 3 This is a cross-sectional view showing the schematic structure of the power generation element according to an embodiment.

[0018] Figure 4 This is a plan view showing the schematic structure of the power generation element according to an embodiment.

[0019] Figure 5 This is a flowchart illustrating an example of a method for manufacturing a power generation element according to an embodiment.

[0020] Figure 6 This is a plan view illustrating the state in which the magnetic component and the magnetic collecting component are fixed inside the mold in the embodiment.

[0021] Figure 7It is a diagram used to illustrate the positional relationship between the magnetic component and the collecting component in the power generation element used to measure the power generation voltage.

[0022] Figure 8 This is a schematic diagram of a circuit used to measure the power output of a power generation element.

[0023] Figure 9 It is a diagram showing the power generation results of the power generation element.

[0024] Figure 10 This is a cross-sectional view showing the schematic structure of the power generation element of a modified embodiment 1.

[0025] Figure 11 This is a plan view showing the schematic structure of the power generation element of Modified Example 1 of the embodiment.

[0026] Figure 12 This is a cross-sectional view showing the schematic structure of the power generation element of a modified embodiment 2.

[0027] Figure 13 This is a cross-sectional view showing the schematic structure of another power generation element in a variation of embodiment 2. Detailed Implementation

[0028] Below, refer to the appendix. Figure 1 The embodiments of this disclosure will be described below. Furthermore, the embodiments described below represent specific examples of this disclosure. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions of constituent elements, and connection methods shown in the following embodiments are examples and are not intended to limit this disclosure. Therefore, any constituent elements in the following embodiments not described in the independent claims of this disclosure will be described as arbitrary constituent elements.

[0029] Furthermore, these figures are schematic diagrams and not necessarily strictly representations. Therefore, the scales and other parameters may not be consistent across different figures. Additionally, in each figure, structures substantially identical to those in other figures are labeled with the same reference numerals, and repetitive descriptions are omitted or simplified.

[0030] Furthermore, in this specification, terms such as equal and parallel indicating the relationship between elements, terms such as rectangle indicating the shape of elements, and numerical ranges are not merely expressions with a strict meaning, but also imply that they include substantially equivalent ranges, such as expressions of differences of a few percent or so.

[0031] (Implementation Method)

[0032] Hereinafter, the composite magnetic component of the embodiment, the power generation element having the composite magnetic component, the power generation system having the power generation element, and the encoder having the power generation system will be described.

[0033] (structure)

[0034] First, the structure of the composite magnetic component, power generation element, power generation system, and encoder of this embodiment will be described.

[0035] Figure 1 This is a cross-sectional view showing the schematic structure of encoder 1 in this embodiment. Figure 2 This is a top view of the magnet 10 in the encoder 1 of this embodiment. Furthermore, in Figure 1 In the diagram, the magnetic component 110 and coil 130 of the power generation element 100, housed within the casing 190, are schematically shown by dashed lines. Additionally, for ease of observation, in... Figure 2 The illustrations are omitted except for the magnet 10, the rotating shaft 30, and the magnetic components 110 and coil 130 in the power generation element 100.

[0036] Figure 1 The encoder 1 shown is, for example, a rotary encoder used in conjunction with a motor such as a servo motor. Alternatively, encoder 1 is, for example, an absolute encoder that generates electricity. Encoder 1 detects the rotation angle, rotation amount, and speed of a rotating shaft 30, such as a motor, based on the electrical signal generated by the power generation element 100. Encoder 1 includes: a power generation system 5, which includes a magnet 10, a rotating plate 20, a base plate 40, and the power generation element 100; a control circuit 50; and a memory 60. In encoder 1, the power generation element 100 in the power generation system 5 generates electricity through changes in the magnetic field formed by the magnet 10, achieved by the rotation of the magnet 10, and outputs the generated electricity as an electrical signal.

[0037] The rotating plate 20 is a plate-shaped component that rotates together with a rotating shaft 30, which serves as a drive unit, such as a motor. The central portion of one main surface of the rotating plate 20 is mounted to the end of the rotating shaft 30 along its axial direction (the direction in which the rotating shaft 30 extends). The rotating plate 20 extends in a direction orthogonal to the axial direction of the rotating shaft 30. The rotating plate 20 rotates about a rotation axis A that passes through the center of the rotating shaft 30 and extends along its axial direction. The rotation of the rotating shaft 30 is synchronized with the rotation of the rotating device. The top view of the rotating plate 20 is, for example, circular. The rotating plate 20 is made of, for example, metal, resin, glass, or ceramic.

[0038] The rotation shaft 30 is cylindrical or rod-shaped. The axis of rotation 30 is aligned with the axis of rotation A.

[0039] Magnet 10 is an example of a magnetic field applying part that applies an external magnetic field to power generation element 100. Magnet 10 causes the direction of the magnetic field applied to power generation element 100 to be repeatedly reversed. Magnet 10 is, for example, a plate-shaped magnet. Magnet 10 is located opposite to rotating plate 20 on the main surface of rotating plate 20 on the side opposite to the side where rotation axis 30 is located. In this embodiment, a pair of magnets 10 are provided on the same main surface of rotating plate 20. The thickness direction of rotating plate 20 and the thickness direction of magnet 10 are the same, which is the axial direction of rotation axis 30. The pair of magnets 10 and rotating plate 20 rotate together about rotation axis 30 as the center of rotation (i.e., about rotation axis A as the axis of rotation). By rotating rotation axis 30, the pair of magnets 10 rotate, thereby changing the relative positional relationship between the pair of magnets 10 and power generation element 100, and also changing the magnetic field applied to power generation element 100 from the pair of magnets 10. The rotation direction of a pair of magnets 10 may be either clockwise or counterclockwise, or it may be only one of clockwise and counterclockwise.

[0040] A pair of magnets 10 are arranged at intervals on the same main surface of the rotating plate 20, separated by the rotation axis A of the rotating shaft 30. That is, the rotation axis A of the rotating shaft 30 is located between the pair of magnets 10, forming a space between them. Furthermore, the pair of magnets 10 are arranged symmetrically across the rotation axis A. The pair of magnets 10 have the same shape.

[0041] A pair of magnets 10 are respectively arranged along the rotation direction of the rotation axis 30. The top view shape of each pair of magnets 10 is an arc shape along the rotation direction of the rotation axis 30. Alternatively, only one of the pair of magnets 10 may be provided on the main surface of the rotating plate 20. In addition, the magnets 10 may be other shapes such as ring-shaped, disk-shaped, or rod-shaped magnets, as long as they can change the magnetic field applied to the power generation element 100. Furthermore, the magnets 10 may be permanent magnets, but they may also be electromagnets.

[0042] The N and S poles of each pair of magnets 10 are arranged along the direction in which they are arranged. The order of the S and N poles of each pair of magnets 10 is the same. That is, each pair of magnets 10 is magnetized in the direction in which they are arranged. Therefore, each pair of magnets 10 generates a magnetic field along the direction in which they are arranged.

[0043] In a pair of magnets 10, the rotation axis A side of one magnet 10 is the S pole, and the rotation axis A side of the other magnet 10 is the N pole. Therefore, by rotating the rotation shaft 30, the pair of magnets 10 rotate, and when the positions of the pair of magnets 10 are interchanged, the direction of the magnetic field formed by the pair of magnets 10 is reversed. By rotating such a pair of magnets 10, the magnetic field applied to the power generation element 100 changes. Specifically, by rotating the pair of magnets 10, the direction of the magnetic field applied to the power generation element 100 is repeatedly reversed.

[0044] The substrate 40 is positioned opposite the rotating plate 20 and the magnet 10 on the magnet side of the rotating plate 20, spaced apart. That is, the rotating shaft 30, the rotating plate 20, the magnet 10, and the substrate 40 are arranged sequentially along the axial direction of the rotating shaft 30. The substrate 40 does not rotate with the magnet 10 and the rotating plate 20. The substrate 40 is plate-shaped with its thickness along the axial direction of the rotating shaft 30. The top view of the substrate 40 is, for example, circular. For example, when viewed from the axial direction of the rotating shaft 30, the centers of the rotating shaft 30, the rotating plate 20, and the substrate 40 are aligned at the position of the rotation axis A.

[0045] The substrate 40, for example, is a wiring substrate, on which electronic components such as a power generation element 100, a control circuit 50, and a memory 60 are mounted. Figure 1 In the example shown, a control circuit 50 and a memory 60 are mounted on the main surface of the substrate 40 on the side of the magnet 10, and a power generation element 100 is mounted on the main surface of the substrate 40 opposite to the magnet 10. The substrate 40 is, for example, fixed to a housing (not shown) that constitutes part of an encoder 1 or a motor.

[0046] The power generation element 100 is located on the main surface of the substrate 40 opposite to the side where the magnet 10 is located. Therefore, the substrate 40 side of the power generation element 100 is the magnet 10 side. The power generation element 100 is arranged along the axial direction of the rotation axis 30 with the magnet 10 and the rotating plate 20. Hereinafter, the direction in which the magnet 10 and the rotating plate 20 are arranged with the power generation element 100, as indicated by arrow Z, is sometimes referred to as the "arrangement direction". In this embodiment, the arrangement direction is also the axial direction of the rotation axis 30 and the normal direction of the main surface 11 of the magnet 10. The power generation element 100 does not rotate with the magnet 10 and the rotating plate 20. Furthermore, there are no particular limitations on the arrangement of the power generation element 100. The power generation element 100 can be arranged in a region where a magnetic field generated by the magnet 10 is applied, and generates a power generation pulse by reversing the direction of the magnetic field achieved by the rotation of the rotation axis 30. For example, the power generation element 100 may also be located on the main surface of the substrate 40 on the magnet 10 side.

[0047] The power generation element 100 is positioned opposite the rotating plate 20 along the axial direction of the rotation axis 30. Viewed from the axial direction of the rotation axis 30, the power generation element 100 is positioned offset from the rotation axis A, not overlapping it. Viewed from the axial direction of the rotation axis 30, the power generation element 100 overlaps with the position traversed by the magnet 10 during rotation. Furthermore, the power generation element 100 extends along the main surface of the substrate 40 in a tangential direction to the rotation direction of the magnet 10.

[0048] The power generation element 100 generates electricity by changing the magnetic field formed by the magnet 10 through rotation of the magnet 10, specifically by reversing the direction of the magnetic field, and outputs the generated electricity. The winding axis of the coil 130 of the power generation element 100 is in the direction in which the power generation element 100 extends. The winding axis of the coil 130 is aligned with a first direction D1, which is a predetermined direction in which the magnetic member 110 extends (i.e., the length direction of the magnetic member 110).

[0049] The power generation element 100 includes, for example, a composite magnetic component including a magnetic component 110, a coil 130, terminals 181 and 182, and a housing 190. Details regarding the composite magnetic component and the coil 130 will be described later.

[0050] The magnetic component 110 is a magnetic component that generates the large Backhausen effect, and the coil 130 wound around the magnetic component 110 generates power pulses.

[0051] Terminals 181 and 182 are components used to electrically connect the power generation element 100 to the substrate 40. Terminals 181 and 182 are located at the ends of the power generation element 100 on the substrate 40 side. A magnet 10 is disposed on the side of the power generation element 100 near terminals 181 and 182. Terminal 181 is electrically connected to one end of the wire constituting the coil 130, and terminal 182 is electrically connected to the other end of the wire. That is, the coil 130 and the substrate 40 are electrically connected via terminals 181 and 182.

[0052] The housing 190 houses and supports a composite magnetic component including a magnetic component 110 and a coil 130. The composite magnetic component including the magnetic component 110 and the coil 130 are, for example, embedded in resin or the like within the housing 190. Additionally, the housing 190 houses a portion of terminals 181 and 182. The housing 190 has, for example, an opening on the magnet 10 side of the power generation element 100. The housing 190 is fixed to the substrate 40, for example, by a fixing member (not shown).

[0053] The control circuit 50 is located on the main surface of the substrate 40 on the side of the magnet 10. The control circuit 50 is electrically connected to the power generation element 100. The control circuit 50 acquires electrical signals such as power generation pulses generated by the power generation element 100, and detects (calculates) the rotation angle, rotation amount, and speed of the rotating shaft 30 of a motor or the like based on the acquired electrical signals. The control circuit 50 is, for example, an IC (integrated circuit) package.

[0054] The memory 60 is located on the main surface of the substrate 40 on the side of the magnet 10. The memory 60 is connected to the control circuit 50. The memory 60 is a non-volatile memory such as a semiconductor memory that stores the results detected by the control circuit 50.

[0055] Next, the detailed structure of the power generation element 100 of this embodiment will be described.

[0056] Figure 3 This is a cross-sectional view showing the schematic structure of the power generation element 100 of this embodiment. Figure 4 This is a plan view showing the schematic structure of the power generation element 100 of this embodiment. Figure 3 It shows Figure 4 The cross-section of line III-III is shown. Specifically, Figure 3 A cross-section of the power generation element 100 is shown, cut along the first direction D1 and the alignment direction (direction Z) and passing through the center of the magnetic member 110. Additionally, in Figure 4 The diagram shows a plan view of the power generation element 100 viewed from the outside along the first direction D1. Additionally, in... Figure 3 and Figure 4 The diagrams of terminals 181, 182, and housing 190 are omitted.

[0057] like Figure 3 As shown, the power generation element 100 includes a composite magnetic component 101 and a coil 130. The composite magnetic component 101 is a component for the power generation element 100, and includes a magnetic component 110, two magnetic collecting components 150, and a resin component 170.

[0058] The magnetic component 110 is a linear component extending along the first direction D1. Therefore, the length direction of the magnetic component 110 is the first direction D1. The shape of the magnetic component 110 can also be described as a long rod or column. The cross-sectional shape of the magnetic component 110 when cut along a direction orthogonal to the first direction D1 is, for example, circular or elliptical, but there is no particular limitation; it can also be rectangular, polygonal, or other shapes. In the first direction D1, the length of the magnetic component 110 is longer than the length of the coil 130.

[0059] Furthermore, as described above, the magnetic component 110 is a magnetic component that generates the large Backhausen effect through changes in the external magnetic field formed by the magnet 10, etc. The magnetic component 110 is, for example, a composite magnetic wire such as a Wiegand wire, in which the central portion and the outer peripheral portion in the radial direction have different magnetic properties. In the composite magnetic wire, one of the central portion and the outer peripheral portion is a hard magnetic part, and the other is a soft magnetic part.

[0060] The composite magnetic wire exhibits the following magnetic properties: in the soft magnetic portion, the magnetization direction can be changed by applying a relatively small external magnetic field; conversely, in the hard magnetic portion, the magnetization direction does not change unless a relatively large external magnetic field is applied. When a relatively large external magnetic field, sufficient to reverse the magnetization direction of the hard magnetic portion of the composite magnetic wire, is applied along its length, the magnetization direction of the hard magnetic portion aligns with the magnetization direction of the soft magnetic portion. Subsequently, even if the direction of the external magnetic field applied to the composite magnetic wire is reversed, due to the influence of the hard magnetic portion, the magnetization directions of both the hard and soft magnetic portions do not reverse during periods of low external magnetic field strength. If the external magnetic field after the direction reversal is further increased, the magnetization direction of the soft magnetic portion reverses abruptly when a predetermined threshold is exceeded. This phenomenon of abrupt magnetic field reversal is also known as the Big Backhausen jump. Consequently, the magnetic flux density of the composite magnetic wire changes drastically, generating electricity (electric pulse) in the coil 130 wound around the composite magnetic wire.

[0061] Furthermore, the magnetic component 110 is not limited to composite magnetic wires such as Wiegand wire, but can be a magnetic component with hard and soft magnetic parts having different magnetic properties, thereby generating the large Barkhausen effect. In the magnetic component 110, for example, the hard and soft magnetic parts are arranged in a direction intersecting (e.g., orthogonal) to the first direction D1, and the hard and soft magnetic parts are present in a manner that extends in the first direction D1, thereby generating the large Barkhausen effect. The magnetic component 110 can also be a magnetic component having a structure in which thin films with different magnetic properties are stacked.

[0062] Two magnetic collecting members 150 are arranged separately along a first direction D1. A space 135 for arranging a coil 130 is provided between the two magnetic collecting members 150. The two magnetic collecting members 150 are arranged side-by-side with the coil 130 arranged in the space 135 at both ends of the magnetic member 110 along the first direction D1. The two magnetic collecting members 150 are symmetrical in shape, facing each other across the coil 130. Hereinafter, one of the two magnetic collecting members 150 will be described primarily, but the same description applies to the other.

[0063] like Figure 3 as well as Figure 4As shown, the magnetic collecting member 150 is a cylindrical member with an opening 151. The magnetic collecting member 150 is, for example, a ferrite bead made of a soft magnetic material such as ferrite. The magnetic collecting member 150 is provided for collecting magnetic flux from the magnet 10 and stabilizing the magnetic flux in the magnetic member 110. The magnetic collecting member 150 is, for example, softer magnetic than the soft magnetic portion in the magnetic member 110, that is, it has lower coercivity than the soft magnetic portion in the magnetic member 110.

[0064] The magnetic collecting member 150 is provided with an opening 151 for inserting a portion of the magnetic member 110. The opening 151 is a through hole that extends through the magnetic collecting member 150 along the first direction D1. Furthermore, when viewed along the first direction D1, the opening 151 is located at the center of the magnetic collecting member 150. When viewed along the first direction D1, the outer periphery of the magnetic collecting member 150 and the opening 151 are each circular in shape, for example. Therefore, the magnetic collecting member 150 is, for example, cylindrical.

[0065] The end of the magnetic member 110 in the first direction D1 is located within the opening 151 and is surrounded by the magnetic collecting member 150. Therefore, in the first direction D1, the end face 154 of the magnetic collecting member 150 on the side opposite to the side where the space 135 is located is located outside the end face 112 of the magnetic member 110. That is, in the first direction D1, the end face 154 is located on the side of the end face 112 opposite to the side where the space 135 is located. In this specification, "outer side" in the first direction D1 refers to the direction away from the center of the magnetic member 110 in the first direction D1, and "inner side" in the first direction D1 refers to the direction closer to the center of the magnetic member 110 in the first direction D1. Furthermore, in the first direction D1, the end face 154 may be at the same position as the end face 112 or it may be inside the end face 112. That is, the magnetic member 110 may also penetrate through the opening 151.

[0066] The resin component 170 fixes the magnetic component 110 and the two magnetizing components 150. The resin component 170 is in contact with the magnetic component 110 and the two magnetizing components 150. In the composite magnetic component 101, the magnetic component 110 and the two magnetizing components 150 are fixed to the resin component 170 in a manner that the relative positions of the magnetic component 110 and the two magnetizing components 150 do not change. The resin component 170 is, for example, a molded resin article formed integrally with the magnetic component 110 and the two magnetizing components 150.

[0067] The resin component 170 has a first cover portion 171, a second cover portion 172, and a third cover portion 173. The first cover portion 171, the second cover portion 172, and the third cover portion 173 are, for example, designations for different parts formed by processing a component made of the same material. The first cover portion 171, the second cover portion 172, and the third cover portion 173 may also be composed of independent components. Furthermore, the resin component 170 only needs to have a first cover portion 171; the shape of the resin component 170 is not particularly limited as long as the magnetic component 110 can be fixed to the two magnetic collecting components 150. For example, the resin component 170 may not have at least one of the second cover portion 172 and the third cover portion 173.

[0068] The first cover portion 171 covers the outer peripheral surface 111 of the magnetic member 110. The outer peripheral surface 111 is the surface that forms the outer periphery of the magnetic member 110 when viewed along the first direction D1; it can also be described as the radial surface of the magnetic member 110. The first cover portion 171 is in contact with the outer peripheral surface 111 of the magnetic member 110. The first cover portion 171 covers at least a portion of the outer peripheral surface 111 of the magnetic member 110 between at least two magnetic collecting members 150. Figure 3 In the example shown, except for the portion where the hole 175 is formed (described later), the first covering portion 171 covers the entire outer peripheral surface 111 of the magnetic member 110. Alternatively, the outer peripheral surface 111 of the magnetic member 110 may also have portions not covered by the first covering portion 171, in addition to the portion where the hole 175 is formed. For example, the first covering portion 171 covers more than 90% of the area of ​​the outer peripheral surface 111 of the magnetic member 110. The first covering portion 171 may also cover more than 95% of the area of ​​the outer peripheral surface 111 of the magnetic member 110.

[0069] The first covering portion 171 fills the space between the inner wall 152 of the opening 151 of the magnetic collecting member 150 and the outer peripheral surface 111 of the magnetic member 110. Therefore, the relative position of the magnetic member 110 and the two magnetic collecting members 150 in the direction orthogonal to the first direction D1 is less likely to shift. Figure 3 as well as Figure 4 In the example shown, the magnetic member 110 is arranged in the opening 151 of the magnetic collecting member 150 such that the distance between the inner wall 152 of the opening 151 and the outer peripheral surface 111 of the magnetic member 110 is equal. Furthermore, the distance between the inner wall 152 of the opening 151 and the outer peripheral surface 111 of the magnetic member 110 is maintained by the first covering portion 171. Therefore, the magnetic flux collected by the magnetic collecting member 150 is transmitted equally to the magnetic member 110, thus facilitating the application of a uniform magnetic field to the entire magnetic member 110 and reducing deviations in the power generation in the power generation element 100. Figure 3 as well as Figure 4In the example shown, when viewed along the first direction D1, the shape of the magnetic member 110 is similar to the shape of the opening 151, and the center of the magnetic member 110 coincides with the center of the opening 151. Furthermore, the distance between the inner wall 152 of the opening 151 and the outer peripheral surface 111 of the magnetic member 110 may not be uniform; for example, the magnetic member 110 may also be in contact with the inner wall 152 of the opening 151 of the magnetic collecting member 150. Additionally, when viewed along the first direction D1, the shape of the magnetic member 110 may not be similar to the shape of the opening 151 of the magnetic collecting member 150.

[0070] In addition, Figure 3 as well as Figure 4 In the example shown, the first covering portion 171 completely fills the space between the inner wall 152 of the opening 151 of the magnetic collecting member 150 and the outer peripheral surface 111 of the magnetic member 110, and contacts both the inner wall 152 and the outer peripheral surface 111. Furthermore, there may be portions in the opening 151 that are not filled by the first covering portion 171 between the inner wall 152 and the outer peripheral surface 111 of the magnetic member 110.

[0071] The second cover portion 172 protrudes from the first cover portion 171 in a direction orthogonal to the first direction D1. The second cover portion 172 covers the end face 153 on the space 135 side of the magnetic collecting member 150. Thus, the magnetic collecting member 150 is firmly fixed by the resin member 170. The second cover portion 172 contacts the end face 153 of the magnetic collecting member 150. Figure 3 In the example shown, the second cover 172 covers a portion of the end face 153 of the magnetic collecting member 150. The second cover 172 may also cover the entire end face 153 of the magnetic collecting member 150.

[0072] The third cover portion 173 covers the end face 154 of the magnetizing member 150 opposite to the side where the space 135 is located. Thus, the magnetizing member 150 is firmly fixed by the resin member 170. The third cover portion 173 contacts the end face 154 of the magnetizing member 150. Figure 3 In the example shown, the third cover 173 covers a portion of the end face 154 of the magnetic collecting member 150. The third cover 173 may also cover the entire end face 154 of the magnetic collecting member 150.

[0073] A portion of the third cover 173 enters the opening 151 of the magnetic collecting member 150, and connects with the first cover 171 at the opening 151. The third cover 173 covers the end face 112 of the magnetic member 110 at the opening 151. The third cover 173 contacts the inner wall 152 of the opening 151 and the end face 112 of the magnetic member 110. Figure 3In the example shown, the portion of the opening 151, except for the hole 176 described later, is filled with resin component 170.

[0074] The resin component 170 has holes 175 and 176 extending from the surface of the resin component 170 toward the magnetic component 110. The holes 175 and 176 are formed by forming the resin component 170 while a positioning jig for the magnetic component 110 is pressed onto the magnetic component 110. Figure 3 In the example shown, the interiors of holes 175 and 176 are hollow, but at least a portion of holes 175 and 176 can also be filled with materials such as resin.

[0075] Hole 175 penetrates the first cover portion 171 along the normal direction of the outer peripheral surface 111 of each magnetic component 110, exposing the outer peripheral surface 111 of the magnetic component 110. Hole 176 penetrates the third cover portion 173 along the first direction D1, exposing the end face 112 of the magnetic component 110. Figure 3 In the example shown, multiple holes 175 and 176 are provided. For example, the multiple holes 175 are arranged symmetrically with respect to the magnetic member 110 in a direction orthogonal to the first direction D1. For example, the multiple holes 176 are arranged symmetrically with respect to the magnetic member 110 in the first direction D1. Furthermore, the arrangement and number of holes 175 and 176 are not particularly limited as long as they correspond to the arrangement of the fixture capable of positioning the magnetic member 110 during the formation of the resin member 170. Additionally, depending on the method of forming the resin member 170, holes 175 and 176 may not be provided in the resin member 170.

[0076] The resin component 170 is formed, for example, of a thermoplastic resin. Examples of thermoplastic resins include liquid crystal polymers (LCPs) such as liquid crystal polyesters, polyphenylene sulfide (PPS), and polyamides (PA). The resin component 170 may also be formed of a thermosetting resin.

[0077] The coil 130 is a coil in which the wire constituting the coil 130 is wound around the magnetic member 110 through a first cover portion 171 of the resin member 170. Specifically, the coil 130 is wound along a winding axis that passes through the center of the magnetic member 110 and extends in a first direction D1. In the first direction D1, the coil 130 is located between two end faces 112 on both sides of the magnetic member 110. In addition, at least a portion of the coil 130 is located in the space 135 between the two magnetic collecting members 150. A second cover portion 172 is disposed between the coil 130 and the magnetic collecting member 150.

[0078] [Manufacturing Method]

[0079] Next, the manufacturing method of the power generation element 100 of this embodiment will be described. The power generation element 100 is manufactured, for example, by the following methods... Figure 5 and Figure 6 The manufacturing method described herein shall be used to manufacture the product.

[0080] Figure 5 This is a flowchart illustrating an example of a method for manufacturing the power generation element 100 according to this embodiment.

[0081] In the manufacture of the power generation element 100, firstly, a magnetic component 110 and two magnetic collecting components 150 are fixed in a mold for resin molding (step S10). Figure 6 This is a plan view illustrating the state in which the magnetic component 110 and the magnetic collecting component 150 are fixed within the mold. For example... Figure 6 As shown, a recess 141 for resin inflow is formed in the mold, and a magnetic member 110 and two magnetic collecting members 150 are disposed in the recess 141. In the mold, for example, a jig for positioning the magnetic member 110 is provided with multiple pins 142 and 143, which are used to fix the magnetic member 110 to the mold. The multiple pins 142 contact the outer peripheral surface 111 of the magnetic member 110, clamping the magnetic member 110 in a direction orthogonal to the first direction D1. The multiple pins 143 contact the end face 112 of the magnetic member 110, clamping the magnetic member 110 in the first direction D1. Furthermore, the recess 141, for example, has a portion into which a portion of the magnetic collecting member 150 can be inserted, and the magnetic collecting member 150 is fixed to the mold by inserting this portion. Furthermore, as long as the positions of the magnetic component 110 and the two magnetic collecting components 150 remain unchanged during the formation of the resin component 170 in subsequent processes, there are no particular limitations on the method of fixing the magnetic component 110 and the two magnetic collecting components 150 to the mold. For example, a magnet can also be used to fix the magnetic component 110.

[0082] Next, in the manufacturing of the power generation element 100, a resin component 170 is formed by flowing resin into a mold (step S20). Thus, the molding process is completed. Figure 3 The resin component 170 of the shape shown is used to form a composite magnetic component 101, which is integrally formed with the magnetic component 110, two magnetic collecting components 150, and the resin component 170. The resin used is, for example, the thermoplastic resin described above. Furthermore, the forming portion and shape of the resin component 170 can be adjusted according to the mold shape. The resin component 170 can also be further shaped after molding. In this processing, a portion of the portion where the resin component 170 is formed can be removed, or additional resin can be added by coating the formed resin component 170 with resin, etc.

[0083] Thus, the resin component 170, which fixes the magnetic component 110 and the two magnetizing components 150, is integrally formed, thereby enabling simple and high-precision fixing of the relative positions of the magnetic component 110 and the two magnetizing components 150, and reducing the deviation in the relative positions of the magnetic component 110 and the two magnetizing components 150 in each manufacturing process. While it is also considered to fix the magnetic component 110 and the magnetizing components 150 separately after preparation and assembly using adhesives, this method makes it difficult to improve the positional accuracy of the magnetic component 110 and the magnetizing components 150. Therefore, integrally forming the resin component 170 is effective in reducing the deviation in the relative positions of the magnetic component 110 and the two magnetizing components 150.

[0084] Next, in the manufacturing of the power generation element 100, the coil 130 is wound around the magnetic member 110 through the first cover portion 171 (step S30). For example, the coil 130 can be formed by directly winding the wire constituting the coil 130 around the magnetic member 110 covered by the first cover portion 171. Therefore, it is not necessary to manufacture the coil 130 separately, which simplifies the manufacturing process. In addition, since the outer peripheral surface 111 of the magnetic member 110 is covered by the first cover portion 171, insulation between the magnetic member 110 and the coil 130 can be ensured without additional insulation treatment.

[0085] Then, the composite magnetic component 101 with coil 130 is housed in housing 190, and the coil 130 is electrically connected to terminals 181 and 182, thereby obtaining power generation element 100.

[0086] [The relationship between the relative positions of the magnetic components and the collecting components and the power generation]

[0087] In the power generation element 100 of this embodiment, by fixing the magnetic member 110 and the two magnetic collecting members 150 using the resin member 170, the offset of the relative positions of the magnetic member 110 and the two magnetic collecting members 150 can be suppressed. This reduces the deviation in the power generation of the power generation element 100. Here, the importance of suppressing the offset of the relative positions of the magnetic member 110 and the magnetic collecting members 150 for reducing the deviation in the power generation of the power generation element 100 will be explained based on the results of the inventors' research.

[0088] The inventors of this application measured the power generation voltage of the power generation element when the relative positions of the magnetic component 110 and the magnetic collecting component 150 were changed. Figure 7 This is a diagram illustrating the positional relationship between the magnetic component 110 and the magnetic collecting component 150 of the power generation element used in the measurement of power generation voltage. Figure 8 This is a schematic diagram showing a circuit used to measure the voltage generated by a power generation element. Furthermore, in Figure 7Only the magnetic component 110 and the magnetic collecting component 150 are shown in the figure, but the power generation element used in the measurement is a coil 130 wound around the magnetic component 110.

[0089] like Figure 7 As shown, the magnetic collecting members 150 are arranged with their length direction aligned with the x-axis. With the end face 154 of one magnetic collecting member 150 positioned at 0 mm along the x-axis, the generated voltage was measured when the x-axis position (hereinafter referred to as the x-position) of the end face 112 of the magnetic member 110 was varied to 0 mm, 0.3 mm, and 0.6 mm. The distance L1 between the end faces 154 of the two magnetic collecting members 150 is fixed at 11.5 mm. Furthermore, the length L2 of the magnetic member 110 is 10.7 mm. Additionally, the width (length along the x-axis) of the magnetic collecting member 150 is 1.3 mm.

[0090] In addition, the power generation components and Figure 8 The circuit connection is shown. Specifically, the output of the power generation element is connected to a full-wave rectifier circuit connected to capacitor C and resistor R. A 20Hz alternating magnetic field is applied to the power generation element connected to this circuit, within the range of 20Oe to 200Oe. In the measurement of the generated voltage, the peak voltage of the rectified power generation pulse of the power generation element is measured each time the direction of the alternating magnetic field reverses. Furthermore, for the peak voltage, 2500 measurements are taken, and the average value of the 2500 measured peak voltages is derived. Here, Oe is the unit of magnetic field strength, 1Oe = (1 / (4π))·10 3 A / m = . Where π is the mathematical constant pi.

[0091] Figure 9 It is a diagram showing the power generation results of the power generation element. Figure 9 The measurement results are shown for each x-position of the end face 112 of the magnetic component 110. For example... Figure 9 As shown, even if the x-position of the end face 112 of the magnetic component 110 is offset by only 0.3 mm, the peak voltage of the power generation element will change by a maximum of about 1 V. This is because the change in the relative position of the magnetic component 110 and the magnetic collecting component 150 changes the magnitude of the magnetic field applied to the magnetic component 110 by the magnetic collecting component 150, which is easy to collect magnetic flux, thus affecting the power generation voltage, i.e., the power generation, of the power generation element.

[0092] As described above, in the composite magnetic component 101 of this embodiment, the resin component 170 fixes the magnetic component 110 and the two magnetic collecting components 150, thus suppressing the offset of the relative positions of the magnetic component 110 and the two magnetic collecting components 150. For example, since the magnetic component 110 and the two magnetic collecting components 150 are fixed by the resin component 170, the offset of the relative positions of the magnetic component 110 and the magnetic collecting components 150 can be suppressed when the coil 130 is wound around the magnetic component 110 and when it is assembled into the housing 190. As can be seen from the above-described measurement results of the generated voltage, the power generation of the power generation element 100 depends to a large extent on the relative positions of the magnetic component 110 and the magnetic collecting components 150. Therefore, by using the composite magnetic component 101, which can suppress the offset of the relative positions of the magnetic component 110 and the two magnetic collecting components 150, in the power generation element 100, the deviation of the power generation of the power generation element 100 can be reduced.

[0093] Furthermore, the resin member 170 that fixes the magnetic member 110 and the two magnetic collecting members 150 has a first covering portion 171 that covers the outer peripheral surface 111 of the magnetic member 110. Therefore, even when the coil 130 is wound around the magnetic member 110, the first covering portion 171 can act as an insulating material to ensure insulation between the magnetic member 110 and the coil 130. Thus, by using the composite magnetic member 101 as the winding frame for the coil 130, a power generation element 100 that reduces deviations in power generation can be easily formed.

[0094] [Variation Example 1]

[0095] Next, a variation of the implementation method 1 will be described. In the following description of variation 1, the focus will be on the differences from the implementation method, and the description of the commonalities will be omitted or simplified.

[0096] Figure 10 This is a cross-sectional view showing the schematic structure of the power generation element 100a in this modified example. Figure 11 This is a plan view showing the schematic structure of the power generation element 100a in this modified example. Figure 10 It shows Figure 11 The cross-section of line XX is shown. Specifically... Figure 10 A cross-section of the power generation element 100a is shown, cut along the first direction D1 and the alignment direction (direction Z) and passing through the center of the magnetic member 110. Additionally, in Figure 11 The diagram shows a plan view of the power generation element 100a as seen from the outside along the first direction D1. Additionally, in... Figure 10 and Figure 11 The diagrams of terminals 181, 182, and housing 190 are omitted.

[0097] The power generation element 100a is used, for example, in place of the power generation element 100 of the encoder 1 described above. Figure 10 as well as Figure 11 As shown, the power generation element 100a includes: a composite magnetic component 101a, which includes a magnetic component 110, two magnetic collecting components 150 and a resin component 170a; and a coil 130.

[0098] The resin component 170a has a structure in which the second cover portion 172 of the resin component 170 is changed to the second cover portion 172a.

[0099] The second cover portion 172a covers the entire surface of the end face 153 on the space 135 side of the magnetic collecting member 150 and extends to the outer peripheral surface 155 of the magnetic collecting member 150. The outer peripheral surface 155 is the surface that constitutes the outer periphery of the magnetic collecting member 150 when viewed along the first direction D1. Furthermore, when viewed along the first direction D1, the second cover portion 172a extends to a position further outward than the two magnetic collecting members 150 and the coil 130. As a result, the coil 130 can be supported by the second cover portion 172a that extends to the outside of the magnetic collecting member 150, and the coil 130 can be easily formed even when the radial number of turns of the coil 130 is increased. For example, the radial number of turns of the coil 130 can be increased in the magnetic member 110 without performing processing for maintaining the shape of the coil 130.

[0100] [Variation Example 2]

[0101] Next, a variation of the embodiment 2 will be described. In the following description of variation 2, the focus will be on the differences from the embodiment and variation 1, and the description of the commonalities will be omitted or simplified.

[0102] Figure 12 This is a cross-sectional view showing the schematic structure of the power generation element 100b in this modified example. Figure 13 This is a cross-sectional view showing the schematic structure of another power generation element 100c in this modified example. Figure 12 and Figure 13 Cross-sections of the power generation element 100b and power generation element 100c, respectively, are shown, cut along the first direction D1 and the arrangement direction (direction Z) passing through the center of the magnetic member 110. Additionally, in Figure 12 and Figure 13 The illustration of the casing 190 is omitted in the text.

[0103] Power generation elements 100b and 100c are used, for example, to replace the power generation element 100 of the encoder 1 described above. Figure 12As shown, the power generation element 100b includes: a composite magnetic component 101b, which includes a magnetic component 110, two magnetic collecting components 150, a resin component 170b, and terminals 181b and 182b; and a coil 130. Figure 13 As shown, the power generation element 100c includes: a composite magnetic component 101c, which includes a magnetic component 110, two magnetic collecting components 150, a resin component 170b, and terminals 181b and 182b; and a coil 130. Power generation elements 100b and 100c do not include... Figure 1 Instead of terminals 181 and 182, terminals 181b and 182b are electrically connected to the substrate 40.

[0104] like Figure 12 as well as Figure 13 As shown, the composite magnetic component 101b and the composite magnetic component 101c have the same constituent elements, but the positions of the terminals 181b and 182b are different.

[0105] The resin component 170b has a structure in which the second cover portion 172 and the third cover portion 173 of the resin component 170 are changed to the second cover portion 172b and the third cover portion 173b.

[0106] The resin component 170b fixes the magnetic component 110, the two magnetic collecting components 150, and the terminals 181b and 182b. Thus, in the composite magnetic components 101b and 101c, in addition to the magnetic component 110 and the two magnetic collecting components 150, the terminals 181b and 182b are also fixed to the resin component 170b, making it easy to connect the coil 130 to the terminals 181b and 182b, and enabling the simple formation of the power generation element 100b and the power generation element 100c.

[0107] The resin component 170b contacts the magnetic component 110, the two magnetic collecting components 150, and the terminals 181b and 182b. In the composite magnetic components 101b and 101c, the magnetic component 110, the two magnetic collecting components 150, and the terminals 181b and 182b are fixed to the resin component 170b in such a way that the relative positions of the magnetic component 110, the two magnetic collecting components 150, and the terminals 181b and 182b do not change. The terminals 181b and 182b are fixed to the resin component 170b, for example, in a way that does not contact the magnetic component 110 and the magnetic collecting components 150. The resin component 170b is, for example, a molded resin article formed integrally with the magnetic component 110, the two magnetic collecting components 150, and the terminals 181b and 182b. Alternatively, the resin component 170b may be formed with holes for fixing the terminals 181b and 182b, and the terminals 181b and 182b may be fixed to these holes.

[0108] The second cover portion 172b covers the entire surface of the end face 153 on the space 135 side of the magnetizing member 150 and extends onto the outer peripheral surface 155 of the magnetizing member 150. The third cover portion 173b covers the entire surface of the end face 154 on the side of the magnetizing member 150 opposite to the side where the space 135 is located and extends onto the outer peripheral surface 155 of the magnetizing member 150. The second cover portion 172b and the third cover portion 173b are connected on the outer peripheral surface 155.

[0109] Terminals 181b and 182b are electrically connected to coil 130. Specifically, terminal 181b is electrically connected to one end of the wire constituting coil 130, and terminal 182b is electrically connected to the other end of the wire. For example, the wire is wound and soldered to terminals 181b and 182b. Furthermore, in Figure 12 and Figure 13 The diagram of the wires wound around terminals 181b and 182b is omitted.

[0110] like Figure 12 As shown, in the composite magnetic component 101b, terminals 181b and 182b are disposed between two magnetic collecting components 150 in the first direction D1. Specifically, terminal 181b is fixed to a second cover portion 172b covering the end face 153 of one magnetic collecting component 150, located between the coil 130 disposed in the space 135 and one magnetic collecting component 150. Similarly, terminal 182b is fixed to a second cover portion 172b covering the end face 153 of the other magnetic collecting component 150, located between the coil 130 disposed in the space 135 and the other magnetic collecting component 150. Thus, the coil 130 is close to terminals 181b and 182b, making it easy to form a coil 130 electrically connected to terminals 181b and 182b.

[0111] like Figure 13 As shown, in the composite magnetic component 101c, terminals 181b and 182b are arranged in the first direction D1 on the side of the two magnetic collecting components 150 opposite to the side where the space 135 is located. Specifically, terminal 181b is fixed to the third cover portion 173b covering the end face 154 of one magnetic collecting component 150. Additionally, terminal 182b is fixed to the third cover portion 173b covering the end face 154 of the other magnetic collecting component 150. This ensures that the area of ​​the winding coil 130 is large enough, thus ensuring the power generation of the power generating element 100c.

[0112] (other)

[0113] The composite magnetic component, power generation element, power generation system, and encoder of this disclosure have been described above based on embodiments, but this disclosure is not limited to the above embodiments. Various modifications conceived by those skilled in the art to the above embodiments, and methods implemented by arbitrarily combining the constituent elements and functions of the embodiments without departing from the spirit of this disclosure, are also included in this disclosure.

[0114] For example, in the above embodiment, the composite magnetic member 101 is formed by integrally molding the magnetic member 110, the two magnetizing members 150, and the resin member 170, but is not limited thereto. For example, a first covering portion 171 may be formed by coating the outer peripheral surface 111 of the magnetic member 110 with resin or the like, and the magnetic member 110 with the first covering portion 171 may be pressed into the openings 151 of the two magnetizing members 150 to fix the relative position of the magnetic member 110 and the two magnetizing members 150. That is, the composite magnetic member may also be formed by assembling the magnetic member 110 and the magnetizing member 150, to which at least a portion of the resin member 170 is formed.

[0115] Additionally, for example, in the above embodiment, the opening 151 of the magnetic collecting member 150 is a through hole, but it is not limited to this. The opening 151 of the magnetic collecting member 150 may also be a non-through bottomed hole with an opening only on the inner side in the first direction D1.

[0116] Alternatively, for example, in the above embodiment, the position of the power generation element 100 is fixed, and the magnet 10 rotates by rotating the rotation axis, thereby causing the direction of the magnetic field applied to the power generation element 100 to be repeatedly reversed, but it is not limited to this. Alternatively, the position of the magnet 10 may be fixed, and the power generation element 100 may rotate by rotating the rotation axis, thereby causing the direction of the magnetic field applied to the power generation element 100 to be repeatedly reversed.

[0117] Furthermore, while the above embodiment uses a rotary encoder used in conjunction with a motor as an example, it is not limited thereto. The technology disclosed herein can also be applied to linear encoders.

[0118] The following examples illustrate composite magnetic components, power generation elements, power generation systems, and encoders of this disclosure based on the embodiments described above. The composite magnetic components, power generation elements, power generation systems, and encoders of this disclosure are not limited to the examples described below.

[0119] For example, the composite magnetic component of the first aspect of this disclosure comprises: a magnetic component that generates a large Backhausen effect by a change in an external magnetic field, which is linear in shape extending in a first direction; two magnetic collecting components that are separated from each other and arranged along the first direction, each having an opening for inserting a portion of the magnetic component; and a resin component that fixes the magnetic component and the two magnetic collecting components, the resin component having a first covering portion that covers the outer peripheral surface of the magnetic component at least between the two magnetic collecting components, and a space for arranging a coil being provided between the two magnetic collecting components.

[0120] Alternatively, for example, the composite magnetic component of the second aspect of this disclosure is the composite magnetic component of the first aspect, wherein the first covering portion fills at least a portion between the inner wall of the opening of the magnetic collecting component and the outer peripheral surface of the magnetic component.

[0121] Alternatively, for example, the composite magnetic component of the third aspect of this disclosure is the composite magnetic component of the second aspect, wherein the magnetic component is arranged in the opening of the magnetic collecting component such that the distance between the inner wall and the outer peripheral surface of the magnetic component is equal.

[0122] Alternatively, for example, the composite magnetic component of the fourth aspect of this disclosure is a composite magnetic component of any one of the first to third aspects, having a terminal for electrical connection with the coil, and the resin component fixing the magnetic component, the two magnetic collecting components and the terminal.

[0123] Alternatively, for example, the composite magnetic component of the fifth aspect of this disclosure is the composite magnetic component of the fourth aspect, wherein the terminal is disposed between the two magnetic collecting components in the first direction.

[0124] Alternatively, for example, the composite magnetic component of the sixth aspect of this disclosure is the composite magnetic component of the fourth aspect, wherein the terminal is disposed in the first direction on the side opposite to the side where the space is located of the two magnetic collecting components.

[0125] Alternatively, for example, the composite magnetic component of the seventh aspect of this disclosure is a composite magnetic component of any one of the first to sixth aspects, wherein the resin component has a second covering portion covering the surface of the two magnetic collecting components on the spatial side.

[0126] Additionally, for example, the composite magnetic component of the eighth aspect of this disclosure is the composite magnetic component of the seventh aspect, wherein, when viewed along the first direction, the second covering portion extends to a position further outward than the two magnetic collecting components.

[0127] Alternatively, for example, the composite magnetic component of the ninth aspect of this disclosure is a composite magnetic component of any one of the first to eighth aspects, wherein the resin component is provided with a hole extending from the surface of the resin component toward the magnetic component.

[0128] Additionally, for example, the power generation element of the tenth aspect of this disclosure includes: a composite magnetic member of any one of the first to ninth aspects; and a coil wound around the magnetic member with respect to the first cover portion.

[0129] Additionally, for example, the power generation system of the eleventh aspect of this disclosure includes: a power generation element of the tenth aspect; and a magnetic field applying unit that applies a magnetic field to the power generation element and repeatedly reverses the direction of the magnetic field applied to the power generation element, wherein the power generation element generates electricity by reversing the direction of the magnetic field achieved by the magnetic field applying unit.

[0130] Additionally, for example, the encoder of the 12th aspect of this disclosure includes the power generation system of the 11th aspect, wherein the power generation element outputs electricity generated by reversing the direction of the magnetic field achieved by the magnetic field application part.

[0131] Industrial availability

[0132] The composite magnetic components, power generation elements, power generation systems, and encoders disclosed herein are useful in rotating or linearly moving equipment and devices such as motors.

[0133] Explanation of reference numerals in the attached figures

[0134] 1. Encoder

[0135] 5. Power generation system

[0136] 10. Magnet

[0137] 11. Main surface

[0138] 20. Rotating plate

[0139] 30. Rotation axis

[0140] 40. Substrate

[0141] 50. Control circuit

[0142] 60. Memory

[0143] 100, 100a, 100b, 100c, power generation element

[0144] 101, 101a, 101b, 101c, Composite magnetic components

[0145] 110. Magnetic components

[0146] 111, 155, outer perimeter

[0147] 112, 153, 154, End face

[0148] 130. Coil

[0149] 135. Space

[0150] 141. Concave

[0151] 142, 143, Selling

[0152] 150. Magnetic collecting components

[0153] 151. Opening

[0154] 152. Inner wall

[0155] 170, 170a, 170b, Resin Components

[0156] 171. First Covering Section

[0157] 172, 172a, 172b, Second Covering Section

[0158] 173, 173b, Third Covering Section

[0159] 175, 176, Kong

[0160] 181, 181b, 182, 182b, terminal

[0161] 190. Shell.

Claims

1. A composite magnetic member, wherein the composite magnetic member comprises: a magnetic member that is a magnetic member that generates a large Barkhausen effect by a change in an external magnetic field, and is in a linear shape that extends in a first direction; two magnetic flux collecting members that are two magnetic flux collecting members that are arranged apart from each other and along the first direction, and are provided with an opening portion into which a portion of the magnetic member is inserted; and a resin member that fixes the magnetic member and the two magnetic flux collecting members, the resin member has a first covering portion that covers at least an outer circumferential surface of the magnetic member between the two magnetic flux collecting members, a space for arranging a coil is provided between the two magnetic flux collecting members.

2. The composite magnetic member according to claim 1, wherein the first covering portion fills at least a portion between an inner wall of the opening portion of the magnetic flux collecting member and the outer circumferential surface of the magnetic member.

3. The composite magnetic member according to claim 2, wherein the magnetic member is arranged in the opening portion of the magnetic flux collecting member in such a manner that a distance between the inner wall and the outer circumferential surface of the magnetic member is equal.

4. The composite magnetic member according to claim 1, wherein the composite magnetic member comprises a terminal for electrically connecting with the coil, the resin member fixes the magnetic member, the two magnetic flux collecting members, and the terminal.

5. The composite magnetic member according to claim 4, wherein the terminal is arranged between the two magnetic flux collecting members in the first direction.

6. The composite magnetic member according to claim 4, wherein the terminal is arranged on a side opposite to the side where the space is located, of the two magnetic flux collecting members, in the first direction.

7. The composite magnetic member according to claim 1, wherein the resin member has a second covering portion that covers a surface of the side where the space is located, of the two magnetic flux collecting members.

8. The composite magnetic member according to claim 7, wherein the second covering portion extends to a position farther outside than the two magnetic flux collecting members, when viewed in the first direction.

9. The composite magnetic member according to claim 1, wherein the resin member is provided with a hole that extends from a surface of the resin member toward the magnetic member.

10. A power generating element, wherein the power generating element comprises: the composite magnetic member according to any one of claims 1 to 9; and a coil that is wound around the magnetic member via the first covering portion.

11. A power generating system, wherein the power generating system comprises: the power generating element according to claim 10; and a magnetic field applying portion that applies a magnetic field to the power generating element, and repeatedly inverts a direction of the magnetic field applied to the power generating element, the power generating element generates power by inversion of the direction of the magnetic field by the magnetic field applying portion.

12. An encoder, wherein the encoder comprises the power generating system according to claim 11, the power generating element outputs power generated by inversion of the direction of the magnetic field by the magnetic field applying portion. ​

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