Power generating element, rotation detecting element and encoder

Abstract

To obtain a power generation element with stabilized power output by reducing the effects of assembly variations of magnetic wires.SOLUTION: A power generation element 10 comprises a magnetic wire 1 that undergoes a magnetization reversal due to movement of magnetic poles, a power generation part 2 that converts the amount of change in the magnetic field produced by the magnetization reversal of the magnetic wire 1 into a voltage, and a magnetic material 3 that supports both ends of the magnetic wire 1 and collects the magnetic field of the magnetic poles, in which a non-magnetic layer is provided between the magnetic wire 1 and the magnetic body 3, and the magnetic wire 1 and the magnetic body 3 are in contact through the non-magnetic layer.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a power generating element including a magnetic wire, a rotation detecting element incorporating the power generating element, and an encoder. [Background technology]

[0002] Among encoders that detect rotation, there is an encoder that detects rotation using a magnetic wire. Patent Document 1 discloses an encoder that has a magnetic body for inducing magnetic flux that connects each end of the magnetic wire to a magnet. The encoder disclosed in Patent Document 1 attempts to stabilize the output of a power generating element by inducing the magnetic flux of the magnet to the magnetic wire using a pair of magnetic bodies installed at both ends of the magnetic wire. The encoder disclosed in Patent Document 1 has a groove formed in the magnetic body, and the magnetic wire is placed in the groove. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 188859 Summary of the Invention [Problem to be solved by the invention]

[0004] However, although the encoder disclosed in Patent Document 1 uses a magnetic body to guide the magnetic flux of the magnet to the magnetic wire, the flow of the magnetic field between the magnetic body and the magnetic wire changes due to minute positional fluctuations caused by assembly variations of the magnetic wire. In other words, if assembly variations cause the position of the magnetic wire to shift from the center of the groove width direction, causing the magnetic wire to contact only one of the side walls of the groove, the stability of the output of the power generating element will be impaired.

[0005] The present disclosure has been made in view of the above, and aims to obtain a power generating element that reduces the influence of assembly variations in magnetic wires and stabilizes output. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the power generating element according to the present disclosure includes a magnetic wire whose magnetization reverses when a magnetic pole moves, a power generating unit that converts the amount of change in the magnetic field that occurs with the magnetization reversal of the magnetic wire into voltage, and a magnetic body that supports both ends of the magnetic wire and collects the magnetic field of the magnetic pole. A non-magnetic layer is provided between the magnetic wire and the magnetic body. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to obtain an electric power generating element that reduces the influence of variations in assembly of magnetic wires and stabilizes output. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 shows a configuration of an encoder according to a first embodiment. [Figure 2] FIG. 1 is a perspective view of a power generating element according to a first embodiment; [Figure 3] 1 is a side view of a power generating element according to a first embodiment; [Figure 4] Cross-sectional view of a power generating element according to embodiment 1 [Figure 5] Cross-sectional view of a power generating element according to embodiment 3 [Figure 6] Cross-sectional view of a power generating element according to embodiment 4 [Figure 7] Cross-sectional view of a power generating element according to embodiment 5 [Figure 8] Cross-sectional view of a power generating element according to a sixth embodiment [Figure 9] 13 is a side view of the magnetic wire of the power generating element according to the seventh embodiment. [Figure 10] Cross-sectional view of a power generating element according to embodiment 8 [Figure 11] 13 is an enlarged view of the bottom of the groove of the power generating element according to the ninth embodiment. [Figure 12] Cross-sectional view of a power generating element according to a tenth embodiment [Figure 13] Cross-sectional view of a power generating element according to an eleventh embodiment [Figure 14]Cross-sectional view of a power generating element according to a twelfth embodiment [Figure 15] Cross-sectional view of a power generating element according to a thirteenth embodiment [Figure 16] Cross-sectional view of a power generating element according to a fourteenth embodiment [Figure 17] Cross-sectional view of a power generating element according to a fifteenth embodiment DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a power generating element, a rotation detecting element, and an encoder according to an embodiment will be described in detail with reference to the drawings.

[0010] Embodiment 1 FIG. 1 is a diagram showing the configuration of an encoder according to the first embodiment. The encoder 100 according to the first embodiment includes a rotation detection element 40 and a rotation detection board 30. The rotation detection element 40 includes a power generation element 10 and a rotating disk 20. The rotating disk 20 has magnetic poles 5 including one or more pairs of south and north poles, and is rotatably supported. The rotating disk 20 may be a magnetized magnetic body, or may be a non-magnetic disk with multiple magnets mounted on it. As the rotating disk 20 rotates, an electromotive force is generated in the power generation element 10, causing a current to flow in the rotation detection board 30, and the rotation is detected.

[0011] FIG. 2 is a perspective view of the power generating element according to the first embodiment. FIG. 3 is a side view of the power generating element according to the first embodiment. FIG. 4 is a cross-sectional view of the power generating element according to the first embodiment. FIG. 4 shows a cross section along line IV-IV in FIG. 3. The power generating element 10 includes a magnetic wire 1 whose magnetization is reversed by the movement of a magnetic pole 5 of a rotating disk 20, a power generating unit 2 that converts the amount of change in the magnetic field caused by the magnetization reversal of the magnetic wire 1 into a voltage, and a magnetic body 3 that supports both ends of the magnetic wire 1 and collects the magnetic field of the magnetic pole 5. The power generating unit 2 is a high-density coil that is wound around the magnetic wire 1. A groove 31 is formed in the magnetic body 3. The magnetic wire 1 is disposed in the groove 31.

[0012] As shown in Fig. 4, a non-magnetic layer 3a is formed around the magnetic body 3. The non-magnetic layer 3a can be formed by plating, resin dipping, or painting. The magnetic wire 1 and the magnetic body 3 are in contact with each other via the non-magnetic layer 3a, so that the distance between the magnetic wire 1 and the magnetic body 3 is maintained at the thickness of the non-magnetic layer 3a.

[0013] The thicker the non-magnetic layer 3a, up to a certain point, the more it can reduce the impact of assembly variations in the magnetic wire 1, thereby reducing the noise of the signal and noise and increasing the signal-to-noise ratio. On the other hand, if the non-magnetic layer 3a is too thick, the magnetic collection effect of the magnetic body 3 on the magnetic wire 1 weakens, reducing the magnetic flux passing through the magnetic wire 1, thereby reducing the signal of the signal and noise and decreasing the signal-to-noise ratio. Whether the signal or the noise is reduced depends on the position of the magnetic pole 5, the characteristics of the magnetic pole 5, the shape of the magnetic body 3, the characteristics of the magnetic body 3, the shape of the magnetic wire 1, and the characteristics of the magnetic wire 1. Therefore, the thickness of the non-magnetic layer 3a should be determined based on the signal-to-noise ratio. Forming the non-magnetic layer 3a by methods such as plating, resin dipping, or painting can improve productivity and reduce the impact of assembly variations in the magnetic wire 1, thereby stabilizing output.

[0014] Incidentally, by forming minute irregularities on the surface of the groove portion 31, the contact area between the non-magnetic layer 3a and the magnetic body 3 can be increased, making it possible to make the non-magnetic layer 3a less likely to peel off from the magnetic body 3. Since the non-magnetic layer 3a is less likely to peel off from the magnetic body 3, it is possible to reduce the defect rate and reduce assembly variations in the magnetic wire 1, thereby improving output stability. The minute irregularities on the surface of the groove portion 31 can be formed by manufacturing the magnetic body 3 by press working, so that the surface of the groove portion 31 becomes a press-worked surface. The minute irregularities on the surface of the groove portion 31 may also be formed by other methods.

[0015] In the power generating element 10 according to the first embodiment, the magnetic body 3 and the magnetic wire 1 are in contact with each other via the non-magnetic layer 3a, so that the influence of variations in assembly of the magnetic wire 1 can be reduced and output can be stabilized.

[0016] Embodiment 2 The power generating element 10 according to the second embodiment differs from the power generating element 10 according to the first embodiment in that the non-magnetic layer 3a is not provided over the entire surface of the magnetic body 3, but is provided in the grooves 31 and the outer periphery. By providing the non-magnetic layer 3a only in the grooves 31 and the outer periphery, it is possible to form a magnetic body 3 on which the non-magnetic layer 3a is partially provided by forming the non-magnetic layer 3a after extrusion and then dicing the magnetic body 3. By forming the non-magnetic layer 3a before dicing the magnetic body 3, it is possible to increase the productivity of the magnetic body 3 on which the non-magnetic layer 3a is formed. Note that when the non-magnetic layer 3a is formed by plating, the extrusion process can be performed after the non-magnetic layer 3a is formed.

[0017] In the power generating element 10 of embodiment 2, similar to the power generating element 10 of embodiment 1, the magnetic body 3 and the magnetic wire 1 are in contact via the non-magnetic layer 3a, so that the influence of assembly variations in the magnetic wire 1 can be reduced and the output can be stabilized.

[0018] Embodiment 3 5 is a cross-sectional view of a power generating element according to embodiment 3. The power generating element 10 according to embodiment 3 differs from the power generating element 10 according to embodiment 1 in that the non-magnetic layer 3a is provided only in the grooves 31. The power generating element 10 according to embodiment 3 can reduce the amount of material used to form the non-magnetic layer 3a, thereby reducing the manufacturing cost of the power generating element 10. Furthermore, in the power generating element 10 according to embodiment 3, the magnetic body 3 and the magnetic wire 1 are in contact with each other via the non-magnetic layer 3a, as in the power generating element 10 according to embodiment 1. This reduces the influence of variations in assembly of the magnetic wire 1, thereby stabilizing the output.

[0019] Embodiment 4 FIG. 6 is a cross-sectional view of a power generating element according to the fourth embodiment. The power generating element 10 according to the fourth embodiment differs from the power generating element 10 according to the first embodiment in that a non-magnetic film 3c, which is a non-magnetic layer, is disposed between the magnetic wire 1 and the magnetic body 3. The non-magnetic film 3c may be an adhesive film or a non-adhesive film. If the non-magnetic film 3c is made adhesive, it can be adhered to the magnetic wire 1 or the magnetic body 3, thereby preventing misalignment of the non-magnetic film 3c. In the power generating element 10 according to the fourth embodiment, the magnetic body 3 and the magnetic wire 1 are in contact with each other via the non-magnetic film 3c. Therefore, similar to the power generating element 10 according to the first embodiment, the influence of assembly variations in the magnetic wire 1 can be reduced, thereby stabilizing the output.

[0020] Embodiment 5. FIG. 7 is a cross-sectional view of a power generating element according to the fifth embodiment. The power generating element 10 according to the fifth embodiment differs from the power generating element 10 according to the first embodiment in that the magnetic body 3 includes a bent portion 32. The magnetic body 3 has a non-magnetic layer 3a formed on one surface and then bent, thereby providing the non-magnetic layer 3a in the grooves 31. Because the grooves 31 have a width equivalent to the wire diameter of the magnetic wire 1, it is difficult to form the non-magnetic layer 3a after the grooves 31 are formed. In the power generating element 10 according to the fifth embodiment, the non-magnetic layer 3a is formed first and then bent, which makes it easy to form the magnetic body 3 having the non-magnetic layer 3a in the grooves 31. In the power generating element 10 according to the fifth embodiment, the magnetic body 3 and the magnetic wire 1 are in contact with each other via the non-magnetic layer 3a, as in the power generating element 10 according to the first embodiment. This reduces the influence of assembly variations in the magnetic wire 1, thereby stabilizing the output.

[0021] Embodiment 6 FIG. 8 is a cross-sectional view of a power generating element according to embodiment 6. The power generating element 10 according to embodiment 6 differs from the power generating element 10 according to embodiment 1 in that the magnetic body 3 does not have a non-magnetic layer 3a, but the magnetic wire 1 has a non-magnetic layer 1a. The non-magnetic layer 1a can be formed by a method such as plating, resin dipping, or painting. Forming the non-magnetic layer 1a by a method such as plating, resin dipping, or painting can improve productivity. In the power generating element 10 according to embodiment 6, the magnetic body 3 and the magnetic wire 1 are in contact with each other via the non-magnetic layer 1a, thereby reducing the influence of variations in assembly of the magnetic wire 1 and stabilizing output.

[0022] Embodiment 7 9 is a side view of the magnetic wire of the power generating element according to embodiment 7. The power generating element 10 according to embodiment 7 differs from the power generating element 10 according to embodiment 6 in that the magnetic wire 1 has a non-magnetic layer 1a formed only at the end portion in contact with the magnetic body 3.

[0023] If a non-magnetic layer 1a is provided on the magnetic wire 1, the non-magnetic layer 1a may apply compressive or tensile stress to the magnetic wire 1, potentially destabilizing the performance of the magnetic wire 1. In the power generating element 10 according to the seventh embodiment, the non-magnetic layer 1a is formed only on the ends of the magnetic wire 1, thereby reducing the stress applied to the magnetic wire 1. In the power generating element 10 according to the seventh embodiment, the magnetic body 3 and the magnetic wire 1 are in contact with each other via the non-magnetic layer 1a, thereby reducing the influence of variations in the assembly of the magnetic wire 1 and stabilizing the output.

[0024] Embodiment 8 FIG. 10 is a cross-sectional view of a power generating element according to the eighth embodiment. The power generating element 10 according to the eighth embodiment differs from the power generating element 10 according to the first embodiment in that the bottoms of the grooves 31 are curved. In the power generating element 10 according to the eighth embodiment, the bottoms of the grooves 31 of the magnetic body 3 are curved, so the thickness of the non-magnetic layer 3a at the bottoms of the grooves 31 is uniform. Because the thickness of the non-magnetic layer 3a at the bottoms of the grooves 31 is uniform, it is possible to reduce variations in the magnetic distance between the magnetic wire 1 and the magnetic body 3 and improve the stability of the output. Furthermore, in the power generating element 10 according to the eighth embodiment, the magnetic body 3 and the magnetic wire 1 are in contact with each other via the non-magnetic layer 3a, so it is possible to reduce the influence of variations in the assembly of the magnetic wire 1 and stabilize the output.

[0025] Embodiment 9 11 is an enlarged view of the bottom of the groove of the power generating element according to embodiment 9. The power generating element 10 according to embodiment 9 differs from the power generating element 10 according to embodiment 1 in that the bottom of the groove 31 is V-shaped. In the power generating element 10 according to embodiment 10, the magnetic wire 1 contacts the non-magnetic layer 3a at two locations on the bottom of the V-shaped groove 31.

[0026] Near the apex of the V-shape, the width of the groove 31 gradually decreases, causing the thickness of the non-magnetic layer 3a to become non-uniform. However, because the magnetic wire 1 does not contact the non-magnetic layer 3a near the apex of the V-shape, the presence of a portion where the thickness of the non-magnetic layer 3a is non-uniform is unlikely to affect the positioning accuracy of the magnetic wire 1. Therefore, the power generating element 10 according to the ninth embodiment can improve the positioning accuracy of the magnetic wire 1. Furthermore, in the power generating element 10 according to the ninth embodiment, the magnetic body 3 and the magnetic wire 1 contact each other via the non-magnetic layer 3a, reducing the influence of assembly variations in the magnetic wire 1 and stabilizing the output.

[0027] Embodiment 10 12 is a cross-sectional view of a power generating element according to embodiment 10. The power generating element 10 according to embodiment 10 differs from the power generating element 10 according to embodiment 1 in that the magnetic body 3 is annular. The non-magnetic layer 3a is formed only below the magnetic body 3.

[0028] Because the magnetic body 3 is annular, the non-magnetic layer 3a can be formed while the magnetic body 3 is suspended from a rod. Furthermore, because the magnetic body 3 can be held and transported while suspended from a rod, handling of the components during assembly of the power generating element 10 is easy, improving productivity. Note that although the magnetic body 3 has a rounded rectangular outer shape in this example, the outer shape of the magnetic body 3 may be circular, elliptical, or rectangular. In the power generating element 10 according to the tenth embodiment, the magnetic body 3 and the magnetic wire 1 are in contact with each other via the non-magnetic layer 3a, and therefore the influence of variations in the assembly of the magnetic wire 1 can be reduced, thereby stabilizing output.

[0029] Embodiment 11 13 is a cross-sectional view of a power generating element according to embodiment 11. The power generating element 10 according to embodiment 11 differs from the power generating element 10 according to embodiment 10 in that a non-magnetic layer 3a is formed over the entire magnetic body 3.

[0030] By making the outer shape of the magnetic body 3 symmetrical from top to bottom and forming a non-magnetic layer 3a over the entire magnetic body 3, it is no longer necessary to distinguish between the top and bottom of the magnetic body 3 during assembly, and assembly errors can be prevented. Furthermore, if the outer shape of the magnetic body 3 is circular, it is no longer necessary to distinguish between the left and right, further improving the efficiency of the assembly work. In the power generation element 10 according to embodiment 11, the magnetic body 3 and the magnetic wire 1 contact each other via the non-magnetic layer 3a, and therefore the influence of assembly variations in the magnetic wire 1 can be reduced, thereby stabilizing the output.

[0031] Embodiment 12 14 is a cross-sectional view of a power generating element according to embodiment 12. In the power generating element 10 according to embodiment 12, the non-magnetic layer 1a is made of a material having a smaller elastic modulus than the magnetic wire 1. The non-magnetic layer 1a is formed to the same thickness all around the magnetic wire 1. The diameters of the magnetic wire 1 and the non-magnetic layer 1a are larger than the width of the groove 31. The magnetic wire 1 and the non-magnetic layer 1a are fitted into the groove 31 with the non-magnetic layer 1a deformed. That is, the non-magnetic layer 1a is compressed between the magnetic wire 1 and the magnetic body 3.

[0032] In the power generating element 10 according to the twelfth embodiment, the magnetic wire 1 is positioned at the center of the groove 31 in the width direction due to the self-alignment effect caused by the restoring force of the non-magnetic layer 1a. Therefore, the power generating element 10 according to the twelfth embodiment can improve the assembly precision of the magnetic wire 1. Furthermore, in the power generating element 10 according to the twelfth embodiment, the magnetic body 3 and the magnetic wire 1 are in contact with each other via the non-magnetic layer 1a, so that the influence of variations in the assembly of the magnetic wire 1 can be reduced and output can be stabilized.

[0033] Although the structure in which the magnetic wire 1 is fitted into the groove 31 of the magnetic body 3 has been described here, the magnetic wire 1 may also be fitted into a hole in the magnetic body 3. By fitting the magnetic wire 1 into the hole in the magnetic body 3, a restoring force acts on the magnetic wire 1 from all directions, resulting in a self-alignment effect in all directions, up and down, left and right, and improving the positioning accuracy of the magnetic wire 1.

[0034] Embodiment 13 15 is a cross-sectional view of a power generating element according to embodiment 13. In the power generating element 10 according to embodiment 13, the non-magnetic layers 3a are formed of a material with a smaller elastic modulus than the magnetic body 3. The gap between the non-magnetic layers 3a in the grooves 31 is smaller than the diameter of the magnetic wire 1. The magnetic wire 1 is fitted into the grooves 31 with the non-magnetic layers 3a deformed. That is, the non-magnetic layers 3a are compressed between the magnetic wire 1 and the magnetic body 3.

[0035] In the power generating element 10 according to the thirteenth embodiment, the magnetic wire 1 is positioned at the center of the groove 31 in the width direction due to the self-alignment effect caused by the restoring force of the non-magnetic layer 3a. Therefore, the power generating element 10 according to the thirteenth embodiment can improve the assembly precision of the magnetic wire 1. Furthermore, in the power generating element 10 according to the thirteenth embodiment, the magnetic body 3 and the magnetic wire 1 are in contact with each other via the non-magnetic layer 3a, so that the influence of variations in the assembly of the magnetic wire 1 can be reduced and output can be stabilized.

[0036] The non-magnetic layer 3 a may be formed on the entire surface of the magnetic body 3 , or may be formed partially in the groove 31 at a location that contacts the magnetic wire 1 .

[0037] Although the structure in which the magnetic wire 1 is fitted into the groove 31 of the magnetic body 3 has been described here, the magnetic wire 1 may also be fitted into a hole in the magnetic body 3. By fitting the magnetic wire 1 into the hole in the magnetic body 3, a restoring force acts on the magnetic wire 1 from all directions, resulting in a self-alignment effect in all directions, up and down, left and right, and improving the positioning accuracy of the magnetic wire 1.

[0038] Embodiment 14 16 is a cross-sectional view of a power generating element according to embodiment 14. In the power generating element 10 according to embodiment 14, the magnetic body 3 is composed of two concave-shaped members 34, and the depressions 35 of the two concave-shaped members 34 are butted together to form a hole 33 at the boundary. A non-magnetic layer 3a is formed in the depression 35 of the concave-shaped member 34.

[0039] The distance between the non-magnetic layers 3a of the two concave-shaped members 34 in the hole 33 may be smaller than the diameter of the magnetic wire 1. Generally, a non-magnetic layer can be formed with a highly accurate thickness in a recessed portion more easily than in a hole. In the power generating element 10 according to the fourteenth embodiment, the recesses 35 of the two concave-shaped members 34 are butted together to form a hole 33 at the boundary, so that the non-magnetic layer 3a can be formed with a highly accurate thickness in the hole 33. In the power generating element 10 according to the fourteenth embodiment, the magnetic body 3 and the magnetic wire 1 are in contact with each other via the non-magnetic layer 3a, so that the influence of assembly variations in the magnetic wire 1 can be reduced and output can be stabilized.

[0040] Alternatively, the nonmagnetic layer 3a may be made of a material with a smaller elastic modulus than the magnetic body 3, and the distance between the nonmagnetic layers 3a of the two concave-shaped members in the hole 33 may be larger than the diameter of the magnetic wire 1. By placing the magnetic wire 1 in the depression 35 of the concave-shaped member 34 and then bringing the concave-shaped members 34 into close contact with each other, the nonmagnetic layer 3a deforms and the magnetic wire 1 is fitted into the center of the hole 33. In other words, the nonmagnetic layer 3a is compressed between the magnetic wire 1 and the magnetic body 3. In this way, the magnetic wire 1 can be positioned in the center of the hole 33 due to the self-alignment effect caused by the restoring force of the nonmagnetic layer 3a.

[0041] Embodiment 15 17 is a cross-sectional view of a power generating element according to embodiment 15. In the power generating element 10 according to embodiment 15, the magnetic body 3 is composed of two concave-shaped members 34, and the recesses 35 of the two concave-shaped members 34 are butted against each other to form a hole 33 at the boundary. A non-magnetic layer 1a is formed on the magnetic wire 1.

[0042] The size of the hole 33 may be smaller than the diameter of the magnetic wire 1 and the non-magnetic layer 1a. In the power generating element 10 according to the fifteenth embodiment, the magnetic body 3 and the magnetic wire 1 are in contact with each other via the non-magnetic layer 1a, so that the influence of variations in the assembly of the magnetic wire 1 can be reduced and the output can be stabilized.

[0043] Alternatively, the non-magnetic layer 1a may be made of a material with a lower elastic modulus than the magnetic wire 1, and the size of the hole 33 may be larger than the diameter of the magnetic wire 1 and the non-magnetic layer 1a. By placing the magnetic wire 1 in the depression 35 of the concave-shaped member 34 and then bringing the concave-shaped members 34 into close contact with each other, the non-magnetic layer 1a deforms and the magnetic wire 1 is fitted into the center of the hole 33. In other words, the non-magnetic layer 1a is compressed between the magnetic wire 1 and the magnetic body 3. In this way, the magnetic wire 1 can be positioned in the center of the hole 33 due to the self-alignment effect caused by the restoring force of the non-magnetic layer 3a.

[0044] The configurations shown in the above embodiments are merely examples of the content, and may be combined with other known technologies, or parts of the configurations may be omitted or modified without departing from the spirit of the invention. [Explanation of symbols]

[0045] 1 magnetic wire, 1a, 3a non-magnetic layer, 2 power generating section, 3 magnetic body, 3c non-magnetic film, 5 magnetic pole, 10 power generating element, 20 rotating disk, 30 rotation detection board, 31 groove portion, 32 bent portion, 33 hole portion, 34 concave-shaped member, 35 recess, 40 rotation detection element, 100 encoder.

Claims

1. a magnetic wire whose magnetization reverses when the magnetic pole moves; a power generating unit that converts a change in magnetic field caused by the magnetization reversal of the magnetic wire into a voltage; a magnetic body that supports both ends of the magnetic wire and collects the magnetic field of the magnetic pole, a non-magnetic layer is provided between the magnetic wire and the magnetic body, a groove is provided in the magnetic body, and the magnetic wire is disposed in the groove; The power generating element is characterized in that the non-magnetic layer is formed only in the groove portion.

2. The power generating element according to claim 1, characterized in that the bottom of the groove is V-shaped, and the magnetic wire is supported via the non-magnetic layer by two surfaces forming the V-shape of the bottom of the groove.

3. 2. The power generating element according to claim 1, wherein the bottom of the groove is a curved surface, and the magnetic wire is in contact with the curved surface via the non-magnetic layer.

4. A magnetic wire whose magnetization reverses when the magnetic pole moves; a power generating unit that converts a change in magnetic field caused by the magnetization reversal of the magnetic wire into a voltage; a magnetic body that supports both ends of the magnetic wire and collects the magnetic field of the magnetic pole, a non-magnetic layer is provided between the magnetic wire and the magnetic body, a hole is provided in the magnetic body, and the magnetic wire is disposed in the hole; The power generating element is characterized in that the non-magnetic layer is formed only in the hole portion.

5. The power generating element according to claim 4, characterized in that the magnetic body is composed of two concave-shaped members, and the recesses of the two concave-shaped members are butted together to form the hole portion at the boundary.

6. The power generating element according to any one of claims 1 to 5, characterized in that the non-magnetic layer is formed of a material having a smaller elastic modulus than the magnetic wire, and the non-magnetic layer is compressed between the magnetic wire and the magnetic body.

7. 7. The power generating element according to claim 1, wherein the non-magnetic layer is a coating film, a resin film, or a plating film.

8. The power generating element according to any one of claims 1 to 7, a rotating disk having the magnetic poles including one or more pairs of south and north poles and rotatably supported;

9. The rotation detection element according to claim 8; an encoder comprising: a rotation detection board that detects a current that flows due to an electromotive force generated in the power generating element as the rotating disk rotates.

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