Angle sensor

Abstract

An angle sensor (1) comprises: a cylinder (10) having a side surface (11) extending in the circumferential direction; and a coil (30) fixed to the side surface (11). The side surface (11) of the cylinder (10) has provided thereto a plurality of lattice bodies (20) arranged in the circumferential direction and the axial-line x-direction, and a conductive wire (31) for forming the coil (30) is fitted in a gap between the plurality of lattice bodies (20).

Description

Angle Sensor

[0001] The present invention relates to an angle sensor, and more particularly to an inductive angle sensor.

[0002] Conventionally, various sensors have been used to detect the rotation angle of a motor, etc. An inductive sensor is one of such angle sensors for detecting the rotation angle (see, for example, Patent Document 1).

[0003] JP 2017-67600 A

[0004] Conventional inductive sensors have room for improvement in terms of detection accuracy.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an angle sensor that can improve detection accuracy.

[0006] An angle sensor according to one aspect of the present invention comprises a tube having a side extending circumferentially and a coil fixed to the side, and the side of the tube is provided with a plurality of lattice elements arranged circumferentially and axially, with a conducting wire forming the coil fitted into the gaps between the plurality of lattice elements.

[0007] 10 is a diagram schematically illustrating the configuration of an angle sensor according to an embodiment of the present invention, and is a partially transparent perspective view schematically illustrating the internal configuration through some members of the angle sensor. FIG. 10 is a perspective view schematically illustrating the angle sensor. FIG. 10 is a front view schematically illustrating the angle sensor. FIG. 11 is a side view schematically illustrating the angle sensor. FIG. 11 is an exploded perspective view schematically illustrating the configuration of a stator included in the angle sensor. FIG. 11 is a perspective view schematically illustrating the configuration of a cylinder included in the angle sensor. FIG. 12 is a side view schematically illustrating the configuration of the cylinder 10. FIG. 12 is a perspective view showing an enlarged portion of the cylinder 10. FIG. 13 is a perspective view schematically illustrating a coil structure formed by a plurality of coils included in the angle sensor. FIG. 13 is a diagram schematically illustrating the configuration of the coil structure shown in FIG. 10. FIG. 13 is a diagram showing an example of a coil formed by fitting conductive wires included in the angle sensor into lattice grooves. FIG. 14 is a perspective view schematically illustrating the configuration of a first frame included in the stator. FIG. 15 is a rear view schematically illustrating the configuration of the first frame included in the stator. FIG. 15 is a perspective view schematically illustrating the configuration of a second frame included in the stator. FIG. 15 is a rear view schematically illustrating the configuration of the second frame included in the stator. FIG. 16 is a cross-sectional view showing the stator in an assembled state in which the cylinder and the frame are assembled and the cylinder is fixed to the frame.

[0008] An embodiment of the present invention will be described below with reference to the accompanying drawings. Note that in the drawings, not all of the components are designated by reference numerals, and some of the components may be omitted. FIG. 1 is a diagram schematically illustrating the configuration of an angle sensor 1 according to an embodiment of the present invention, and is a partially transparent perspective view showing the internal configuration of the angle sensor 1 through some of its components. FIG. 2 is a perspective view schematically illustrating the angle sensor 1, FIG. 3 is a front view schematically illustrating the angle sensor 1, and FIG. 4 is a side view schematically illustrating the angle sensor 1. FIG. 5 is an exploded perspective view schematically illustrating the configuration of a stator 3 included in the angle sensor 1. As shown in FIGS. 1 to 5 , the angle sensor 1 includes a cylinder 10 having a side surface 11 extending in the circumferential direction and a coil 30 fixed to the side surface 11. A plurality of lattice elements 20 are provided on the side surface 11 of the cylinder 10, arranged in the circumferential and axial directions along the axis x. Conductive wires 31 forming the coil 30 are fitted into the gaps between the plurality of lattice elements 20. The configuration of the angle sensor 1 will now be described in detail. The axis x is the axis of rotation of the angle sensor 1, and the circumferential direction is the direction around the axis x. The direction perpendicular to the axis x is the radial direction.

[0009] Specifically, as shown in, for example, FIGS. 1 to 4, the angle sensor 1 includes a rotor 2, which is a rotating body, and a stator 3. The rotor 2 includes a cylinder 40 and a plurality of conductors 5 fixed to the cylinder 40. The stator 3 includes the above-mentioned cylinder 10 and coil 30. As shown in FIGS. 2 to 4, in the angle sensor 1, the rotor 2 is disposed inside the stator 3, and the rotor 2 and stator 3 face each other in the radial direction of the cylinder 40. Note that FIGS. 2 to 4 show the rotor 2 and stator 3 in a predetermined positional relationship. This predetermined positional relationship is an example of the positional relationship between the rotor 2 and stator 3 when the angle sensor 1 is attached to an application object and in use.

[0010] As shown in FIGS. 1 to 4 , the cylinder 40 of the rotor 2 is a cylindrical member extending along the axis x. Note that FIG. 1 shows the interior of the cylinder 40 in a see-through manner. The cylinder 40 of the rotor 2 is attached to a rotating member of an external device to which the angle sensor 1 is applied, so that the axis x coincides or substantially coincides with the rotation axis of the rotating member of the external device. For example, as shown in FIGS. 1 to 4 , the cylinder 40 of the rotor 2 has an inner circumferential surface 41, which is a cylindrical surface extending along a cylindrical surface with the axis x as its central axis, and an outer circumferential surface 42, which is a cylindrical surface facing away from the inner circumferential surface 41 on the radially outer side (hereinafter also referred to as the "outer peripheral side"). The cylinder 40 also has end faces 43 and 44, which are surfaces facing in the respective directions in which the axis x extends. The inner circumferential surface 41 and the outer circumferential surface 42 extend between the end faces 43 and 44. The angle sensor 1 is applied to, for example, a motor, and the motor shaft passes through the inner circumferential surface 41 of the cylinder 40 of the rotor 2, and the rotor 2 is fixed to the shaft. The cylinder 40 is made of, for example, a resin material, a non-magnetic material, a non-conductive material, etc. The non-magnetic material may be non-conductive.

[0011] As shown in FIG. 1 , the tube 40 has a conductor structure 4. The conductor structure 4 is fixed to the tube 40. The conductor structure 4 is formed of conductors, and for example, as shown in FIG. 1 , the conductor structure 4 is composed of a plurality of conductors 5. The plurality of conductors 5 are, for example, arranged in a circumferential direction around the axis x. As shown schematically in FIG. 1 , the plurality of conductors 5 form a cylindrical conductor structure 4 extending in a ring shape around the axis x. The conductors 5 may be any conductive material (a material capable of generating so-called eddy currents or induced currents (currents) within one surface), such as metal bodies 5. Hereinafter, as an example, the angle sensor 1 is assumed to have metal bodies 5 as the conductors 5. The plurality of metal bodies 5 are arranged at predetermined distances in the circumferential direction of the tube 40. In other words, two adjacent metal bodies 5 are separated by a predetermined distance around the axis x. The plurality of conductors 5 are arranged at equal or approximately equal angular intervals in the circumferential direction along a cylindrical surface having the axis x as its central axis. The multiple metal bodies 5 have, for example, a curved shape. The multiple metal bodies 5 may be connected to one another. The multiple metal bodies 5 are connected by one or more connecting parts, and the one or more connecting parts may be formed of a non-conductive material (e.g., resin) or a conductive material (e.g., metal), and the multiple metal bodies 5 may be electrically connected.

[0012] The plurality of metal bodies 5 are provided in a tube 40, for example, as shown in Fig. 1 . The entire metal bodies 5 may be embedded in the tube 40, or a portion of each metal body 5 may be exposed on the surface of the tube 40. The plurality of metal bodies 5 may also be attached to the surface of the tube 40, for example, to the outer peripheral surface 42. In this case, a portion of the metal body 5 may be embedded in the tube 40.

[0013] 1 to 5, the stator 3 has the above-mentioned cylinder 10 and a frame 6. The frame 6 is a member that supports the cylinder 10. The frame 6 has, for example, two members, and the frame 6 can be separated into a first frame 60 and a second frame 70. FIG. 6 is a perspective view showing a schematic configuration of the cylinder 10, and FIG. 7 is a side view showing a schematic configuration of the cylinder 10.

[0014] As shown in Figures 5 to 7, the tube 10 is a cylindrical member extending along the axis x and has, for example, a side surface 11 as well as a first end 12 and a second end 13. The tube 10 also has an inner circumferential surface 14. The side surface 11 is a surface facing the outer periphery of the tube 10. The inner circumferential surface 14 is a surface facing the inner periphery of the tube 10 and is radially opposed to the side surface 11. The first end 12 and the second end 13 are both ends of the tube 10 in the direction of the axis x. The tube 10 has a shape that follows a cylindrical surface having the axis x as its central axis, and the side surface 11 extends, for example, along a cylindrical surface or a substantially cylindrical surface having the axis x as its central axis. The inner circumferential surface 14 extends, for example, on a cylindrical surface or a substantially cylindrical surface having the axis x as its central axis. The first end 12 and the second end 13 extend, for example, in an annular or substantially elongated annular shape.

[0015] As described above, the side surface 11 is provided with a plurality of lattice elements 20 arranged in the circumferential and axial directions, that is, the axis x. As shown in FIGS. 6 and 7 , each of the plurality of lattice elements 20 is a columnar portion protruding outward from the outer periphery and adjacent to other lattice elements 20 with a gap therebetween, and the plurality of lattice elements 20 form lattice grooves 21 on the side surface 11. The lattice grooves 21 are formed by connecting the gaps between adjacent lattice elements 20. As shown in FIGS. 6 and 7 , for example, the lattice grooves 21 include first direction grooves 21 a (grooves extending in the direction of arrow a in FIG. 7 ) that are a plurality of grooves extending along a spiral inclined in one circumferential direction, and second direction grooves 21 b (grooves extending in the direction of arrow b in FIG. 7 ) that are a plurality of grooves extending along a spiral inclined in the other circumferential direction. The first direction grooves 21 a are arranged, for example, at equal or approximately equal intervals in the circumferential direction, and the second direction grooves 21 b are arranged, for example, at equal or approximately equal intervals in the circumferential direction. As shown in Figures 6 and 7, each of the first direction grooves 21 a intersects with one or more second direction grooves 21 b, and similarly, each of the second direction grooves 21 b intersects with one or more first direction grooves 21 a.

[0016] On the side surface 11, the plurality of lattice elements 20 are, for example, lined up in the circumferential direction to form circumferential rows, or are lined up in the circumferential direction so as to form a plurality of circumferential rows. On the side surface 11, the plurality of lattice elements 20 are lined up in the axial x direction to form axial x-direction rows, or are lined up in the axial x direction to form a plurality of axial x-direction rows. All of the lattice elements 20 in the plurality of circumferential rows may also be lined up in the axial x direction, or only some of the lattice elements 20 in the plurality of circumferential rows may also be lined up in the axial x direction. Similarly, all of the lattice elements 20 in the plurality of axial x-direction rows may also be lined up in the circumferential direction, or only some of the lattice elements 20 in the plurality of axial x-direction rows may also be lined up in the circumferential direction.

[0017] The cross-sectional shapes of the grid elements 20 may be different for each row in the circumferential direction. Note that this cross-sectional shape is the shape of a cross section perpendicular to the radial direction, e.g., the shape of a cross section of a cylinder with the axis x as the central axis. Also, this cross-sectional shape is the shape of a cross section taken along a plane perpendicular to the radial direction. Note that the grid elements 20 may have the same shape in any of the multiple circumferential rows, and different shapes in the other rows. Similarly, for example, the cross-sectional shapes of the grid elements 20 may be different for each row in the axial x direction. Note that the cross-sectional shapes of the grid elements 20 may be the same shape in any of the multiple circumferential rows, and different shapes in the other rows. The cross-sectional shapes of the grid elements 20 are set according to the shape of the grating grooves 21. The cross-sectional shapes of the grid elements 20 may all be the same shape.

[0018] As shown in Figures 6 and 7, each of the grid elements 20 has an outer peripheral surface 20a that faces the outer periphery. The outer peripheral surfaces 20a of the grid elements 20 are, for example, curved surfaces, and more specifically, extend in the shape of a cylindrical surface or a substantially cylindrical surface with the axis x as the central axis. As shown in Figures 6 and 7, the side surface 11 is provided with connecting portions 15 that protrude in the radial direction. The connecting portions 15 support a substrate 9, which will be described later. The connecting portions 15 are made of a conductor and are electrically connectable to the substrate 9. The connecting portions 15 may be coated with an insulating material (an insulating film or a coating).

[0019] As shown in Figures 6 and 7, the cylinder 10 has, as an example, a plurality of grid elements 20 arranged in the circumferential direction to form three circumferential rows. The cross-sectional shapes of the grid elements 20 differ for each of the three circumferential rows. That is, the cylinder 10 has a plurality of first grid elements 22 arranged in the circumferential direction to form a single circumferential row, a plurality of second grid elements 23 arranged in the circumferential direction to form a single circumferential row, and a plurality of third grid elements 24 arranged in the circumferential direction to form a single circumferential row. The first grid elements 22 are grid elements 20 that form a row on the first end 12 side of the side surface 11. The second grid elements 23 are grid elements 20 that form a row on the second end 13 side of the side surface 11. The third grid elements 24 are grid elements 20 that form a row between the row of the first grid elements 22 and the row of the second grid elements 23. 6 and 7 , the plurality of first lattice elements 22 and the plurality of second lattice elements 23 are aligned in the direction of the axis x, forming rows in the direction of the axis x. In addition, a pair of the first lattice element 22 and the second lattice element 23 aligned in the direction of the axis x is located between two adjacent third lattices 24 in the circumferential direction.

[0020] As shown in FIGS. 6 and 7 , the cross-sectional shape of the first lattice element 22 is triangular or approximately triangular. The first lattice element 22 has three radially extending surfaces: inner surfaces 22a, 22b, and outer surfaces 22c. The inner surfaces 22a, 22b face the second end 13. The outer surface 22c faces the first end 12 and is connected to the ends of the inner surfaces 22a, 22b on the first end 12 side. The inner surfaces 22a and 22b are connected at their respective inner ends, and the length between the inner and outer ends of the inner surface 22a is the same or approximately the same as the length between the inner and outer ends of the inner surface 22b. Furthermore, as shown in FIGS. 6 to 8 , the first lattice element 22 has a first protrusion 22d that protrudes in the direction of the axis x. The first protrusion 22d protrudes from the outer surface 22c toward the first end 12. The first protrusion 22d protrudes from the outer peripheral portion of the outer surface 22c, as shown in Fig. 8. Fig. 8 is an enlarged perspective view of a portion of the tube 10.

[0021] As shown in Figures 6 and 7, the cross-sectional shape of the second lattice element 23 is rotationally symmetric or plane-symmetric to the cross-sectional shape of the first lattice element 22. That is, the cross-sectional shape of the second lattice element 23 is triangular or approximately triangular, and the second lattice element 23 has three radially extending surfaces: inner surfaces 23a, 23b and outer surfaces 23c. The inner surfaces 23a, 23b face the first end 12. The outer surface 23c faces the second end 13 and is connected to the ends of the inner surfaces 23a, 23b on the second end 13 side. The inner surfaces 23a and 23b are connected at their respective inner ends, and the length between the inner and outer ends of the inner surface 22a is the same or approximately the same as the length between the inner and outer ends of the inner surface 22b. Furthermore, as shown in Figures 6 to 8, the second lattice element 23 has a second protrusion 23d that protrudes in the direction of the axis x. The second protrusion 23d protrudes from the outer surface 23c toward the second end 13. The second protrusion 23d protrudes from the outer peripheral portion of the outer surface 23c, similar to, for example, the first protrusion 22d of the first grid element 22 (see FIG. 8).

[0022] 6 and 7 , the cross-sectional shape of the third lattice element 24 is rhomboidal or approximately rhomboidal, and the third lattice element 24 has four radially extending outer surfaces 24a, 24b, 24c, and 24d. The outer surfaces 24a and 24b face the first end 12, and the outer surfaces 24c and 24d face the second end 13. The outer surfaces 24a and 24b are connected at their ends on the first end 12 side, and the outer surfaces 24c and 24d are connected at their ends on the second end 13 side. Furthermore, the ends of the outer surfaces 24a and 24b on the second end 13 side are connected to the ends of the outer surfaces 24c and 24d on the first end 12 side, respectively. The length between the end of the outer surface 24a on the first end 12 side and the end of the second end 13 side is the same or approximately the same as the length between the end of the outer surface 24b on the first end 12 side and the end of the second end 13 side. The length between the end of the outer surface 24c on the first end 12 side and the end of the second end 13 side is the same or approximately the same as the length between the end of the outer surface 24d on the first end 12 side and the end of the second end 13 side. The length between the end of the outer surface 24a on the first end 12 side and the end of the second end 13 side is the same or approximately the same as the length between the end of the outer surface 24c on the first end 12 side and the end of the second end 13 side. The angle between the outer surface 24a and the outer surface 24b is the same or approximately the same as the angle between the outer surface 24c and the outer surface 24d. As shown in FIG. 8 , at least one of the third grid elements 24 may have a third protrusion 24e protruding radially from one or both of its circumferential ends.

[0023] 6 and 7 , in the first lattice element 22 and the second lattice element 23 aligned in the axial x direction, the inner surfaces 22a and 22b of the first lattice element 22 face the inner surfaces 23a and 23b of the second lattice element 23 in the axial x direction. Furthermore, in two third lattice elements 24 adjacent to each other in the circumferential direction, the outer surfaces 24a and 24c of one third lattice element 24 face the outer surfaces 24b and 24d of the other third lattice element 24 in the circumferential direction. Furthermore, the inner surfaces 22a and 22b of the first lattice element 22 face the outer surfaces 24a and 24b of one third lattice element 24 of two adjacent third lattice elements 24 in the circumferential direction, respectively. Furthermore, the inner surfaces 23a, 23b of the second lattice element 23 and the outer surface 24c of one of two circumferentially adjacent third lattice elements 24 and the inner surface 24d of the other third lattice element 24 face each other in the direction of the axis x. In this manner, the plurality of first lattice elements 22, second lattice elements 23, and third lattice elements 24 face each other to form gaps, and the plurality of first lattice elements 22, second lattice elements 23, and third lattice elements 24 collectively form grating grooves 21.

[0024] The tube 10 is, for example, integrally molded from the same material, and each component of the tube 10 is connected together. The tube 10 is an insulating member, for example, a resin member. The tube 10 is made of, for example, a resin material, a non-magnetic material, or a non-conductive material. The non-magnetic material may be non-conductive. Any or all of the components of the tube 10 may be formed as separate bodies. In this case, the components formed as separate bodies are assembled by adhesive or the like to form the tube 10.

[0025] As described above, the coil 30 is made of a conductive conductor 31. The conductor 31 is coated with, for example, an insulating material (an insulating film or coating). The angle sensor 1 includes a plurality of coils 30, which are, for example, lined up and connected in a circumferential direction around the axis x. The plurality of coils 30 form a cylindrical shape (hereinafter referred to as a "coil structure") 7 extending in an annular shape around the axis x. FIG. 9 is a perspective view showing an example of the coil structure 7, and FIG. 10 is a schematic diagram showing the configuration of the coil structure 7 shown in FIG. 9. The coil structure 7 is a shape formed by the arrangement of a plurality of coils 30. In the coil structure 7, the plurality of coils 30 are, for example, lined up in an annular shape, such as along an annular surface around the axis x. The plurality of coils 30 are, for example, lined up in an annular shape, such as along a cylindrical surface with the axis x as the central axis. Furthermore, each coil 30 has, for example, a shape that surrounds a space. Furthermore, each coil 30 has a shape such that the space surrounded by each coil 30 follows an annular surface around the axis x. Specifically, the coil 30 has a ring shape wound around the rotor 2 in the radial direction, and surrounds a planar space facing the radial direction. A plurality of coils 30 are formed on the side surface 11 of the cylindrical portion 10, lined up around the axis x, to form the coil structure 7.

[0026] As shown in Figures 9 and 10, the coil structure 7 has two pieces (hereinafter referred to as "coil structure pieces") 7a and 7b. The coil structure piece 7a is formed by a plurality of coils 30a, which are the above-mentioned coil 30, connected in series in an annular shape. Similarly, the coil structure piece 7b is formed by a plurality of coils 30b, which are the above-mentioned coil 30, connected in series in an annular shape. That is, in each of the coil structure piece 7a and the coil structure piece 7b, a plurality of annular coils 30a and 30b are arranged in the circumferential direction. Note that the coil structure piece 7a and the coil structure piece 7b are coated with, for example, an insulating material (an insulating film or coating) and are electrically insulated from each other. As shown in Figures 9 and 10, the coil structure piece 7a and the coil structure piece 7b overlap each other in the radial direction to form the coil structure 7. In the coil structure pieces 7a and 7b, a portion of the space surrounded by the coil 30a is offset from a portion of the space surrounded by the coil 30b in the circumferential direction, and another portion of the space surrounded by the coil 30a is overlapped in the circumferential direction with another portion of the space surrounded by the coil 30b. Specifically, the space surrounded by the coil 30a is offset from the space surrounded by the coil 30b in the circumferential direction by half the width of the space surrounded by the coil 30a. The number of coils 30a and 30b in each of the coil structure pieces 7a and 7b corresponds to the axial multiplier angle set for the angle sensor 1. The number of coil structure pieces 7a and 7b also corresponds to the number of detection signals output by the coil structure 7.

[0027] As described above, the coil 30 is formed by fitting the conductor wire 31 into the gaps between the plurality of lattice elements 20, i.e., the lattice grooves 21. The conductor wire 31 forming the coil 30 is, for example, a magnet wire. Fig. 11 is a diagram showing an example of a coil 30 formed by fitting the conductor wire 31 into the lattice grooves 21. Note that the conductor wire 31 forming the coil 30 is not limited to a magnet wire.

[0028] As shown in Figure 11, a conductor wire 31 is fitted into the lattice grooves 21 that conform to the desired shape of the coil 30, thereby forming the coil 30 with the desired shape. Furthermore, by repeatedly fitting the conductor wire 31 into the lattice grooves 21 that conform to the desired shape of the coil 30 in the circumferential direction, it is possible to form a plurality of coils 30 with the desired shape that are continuous along the side surface 11 of the tube 10. Because the plurality of lattice elements 20 (lattice grooves 21) are arranged along the side surface 11 of the tube 10, a plurality of coils 30 are formed in a line around the axis x, and each coil 30 forms a ring in the radial direction. Furthermore, the shape of the space surrounded by each coil 30 is the desired shape.

[0029] Each of the coil structure pieces 7a, 7b is formed by, for example, fitting one magnet wire 31a, 31b into the lattice groove 21 on the side surface 11 of the cylinder 10. Specifically, for example, toward one circumferential side, for each lattice element group 50 consisting of a plurality of lattice elements 20, the magnet wire 31a, 31b is wound alternately from the first end 12 side and the second end 13 side along the contour of the lattice element group 50 and fitted into the lattice grooves 21 that follow the contour of the lattice element group 50, and after going around the side surface 11 once, the magnet wire 31a, 31b is turned back, and then, again toward the other circumferential side, the magnet wire 31a, 31b is wound around the contour of the lattice element group 50 and fitted into the lattice grooves 21 that follow the contour of the lattice element group 50 in the same manner, thereby forming the coil structure pieces 7a, 7b. In this case, each of the coils 30a, 30b is formed around the lattice element group 50. The coil structure pieces 7a and 7b are offset from each other in the circumferential direction by half the lattice group 50.

[0030] 7 and 11 , the lattice elements 20 constituting the lattice element group 50 are, for example, a pair of first lattice elements 22 and second lattice elements 23 opposed in the direction of the axis x, and a pair of third lattice elements 24 opposed in the circumferential direction and sandwiching the pair of first lattice elements 22 and second lattice elements 23 in the circumferential direction. In the coil 30, as shown in Figs. 7 and 11 , the magnet wire 31 extends along the outer surface 24b of one of the third lattice elements 24, the outer surface 22c of the first lattice element 22, and the outer surface 24a of the other third lattice element 24, and also extends along the outer surface 24c of the other third lattice element 24, the outer surface 23c of the second lattice element 23, and the outer surface 24d of one of the third lattice elements 24. 7 and 11 , the magnet wire 31 of the coil 30 is fitted into the lattice grooves 21 along the outer surface 24 b of one third lattice element 24 and the lattice grooves 21 along the outer surface 24 a of the other third lattice element 24, and is in contact with the outer surface 22 c of the first lattice element 22 and is engaged with the first protrusions 22 d of the first lattice element 22 between the lattice grooves 21 and 22. That is, the first protrusions 22 d of the first lattice element 22 support the magnet wire 31 on the inner circumferential side. Also, as shown in FIGS. 7 and 11 , the magnet wire 31 of the coil 30 is fitted into the lattice grooves 21 along the outer surface 24 c of the other third lattice element 24 and the lattice grooves 21 along the outer surface 24 d of one third lattice element 24 between the lattice grooves 21 and 22. The magnet wire 31 is in contact with the outer surface 23 c of the second lattice element 23 and is engaged with the second protrusions 23 d of the second lattice element 23. That is, the second protrusions 23d of the second grid element 23 support the magnet wires 31 on the inner peripheral side.

[0031] As described above, the coil structure piece 7a and the coil structure piece 7b are offset in the circumferential direction by half the lattice element group 50. In other words, the lattice element 50 surrounded by the coil 30a of the coil structure piece 7a and the lattice element 50 surrounded by the coil 30b of the coil structure piece 7b partially overlap each other, and more specifically, one third lattice element 24 of the lattice element group 50 surrounded by the coil 30a and the other third lattice element 24 of the lattice element group 50 surrounded by the coil 30b are a common third lattice element 24.

[0032] When forming the coil structure pieces 7a, 7b, the third protrusions 24e (see FIG. 8) formed on the above-described third lattice element 24 can be used when folding back the magnet wire 31. For example, when folding back the magnet wire 31, the magnet wire 31 may be locked to the third protrusions 24e. For example, the magnet wire 31 is locked to the third protrusions 24e by being wound around the third protrusions 24e.

[0033] Both ends of the magnet wire 31, which is fitted into the lattice grooves 21 to form the multiple coils 30, are fixed to connecting portions 15 formed on the tube 10. For example, as shown in FIGS. 6 and 7 , four connecting portions 15 are formed on the tube 10, and both ends 32a1 and 32a2 of the magnet wire 31a and both ends 32b1 and 32b2 of the magnet wire 31b are fixed to the four connecting portions 15 (see FIG. 11 ). Furthermore, both ends 32a1 and 32a2 of the magnet wire 31a and both ends 32b1 and 32b2 of the magnet wire 31b are electrically connected to the four connecting portions 15, respectively. As described above, the connecting portions 15 are electrically connected to the substrate 9, which will be described later, and both ends 32a1 and 32a2 of the magnet wire 31a and both ends 32b1 and 32b2 of the magnet wire 31b can be electrically connected to the substrate 9 via the connecting portions 15.

[0034] Note that each coil 30 (30a, 30b) is not limited to being formed around the lattice element group 50 having the above-described configuration. The lattice element group 50 is not limited to the above-described configuration and can have various configurations depending on the desired shape of the coil 30. Furthermore, although the magnet wire 31 (31a, 31b) is described as being wound around once, the winding form of the magnet wire 31 is not limited to this and may be wound around two or more times. In other words, the coil 30 formed by winding the magnet wire 31 may have, for example, one layer in the radial or axial direction, or multiple layers such as two, three, four, or five layers. A large number of turns or layers can amplify the output signal or the signal to be detected (e.g., the amplitude of the signal waveform).

[0035] Next, the frame 6 that supports the tube 10 will be described. As described above, the frame 6 has a first frame 60 and a second frame 70. FIGS. 12 and 13 are a perspective view and a rear view, respectively, that schematically show the configuration of the first frame 60, and FIGS. 14 and 15 are a perspective view and a front view, respectively, that schematically show the configuration of the second frame 70. Note that FIG. 12 shows the first frame 60 as seen from the rear side, and FIG. 14 shows the second frame 70 as seen from the front side. As shown in FIGS. 4 and 5, the first frame 60 and the second frame 70 are configured to, for example, sandwich and fix the tube 10 therebetween. Note that the first frame 60 and the second frame 70 may be configured to removably fix the tube 10.

[0036] As shown in Figures 12 and 13, the first frame 60 has a cover 61 that partially covers the multiple outer coils 30 attached to the tube 10. The cover 61 is, for example, a cylindrical portion corresponding to the tube 10. The cover 61 is also formed, for example, so that the tube 10 is fixed thereto. The cover 61 forms a space that can accommodate a portion of the tube 10 with a predetermined width in the direction of the axis x from the first end 12, and has an inner circumferential surface 62 that defines this space. This predetermined width is, for example, half or approximately half the width of the tube 10 in the direction of the axis x. The cover 61 also has an outer circumferential surface 63 that faces away from the inner circumferential surface 62 on the outer peripheral side. The inner circumferential surface 62 is a cylindrical surface that extends along the axis x, and the inner circumferential surface 62 extends, for example, on a cylindrical surface with the axis x as its central axis. Specifically, the inner circumferential surface 62 of the cover 61 is formed to be able to accommodate the plurality of grid elements 20 on the side surface 11 of the tube 10, and is configured to radially oppose the outer circumferential surfaces 20a of the plurality of grid elements 20 when the tube 10 is accommodated in the space formed by the inner circumferential surface 62. The inner circumferential surface 62 of the cover 61 has an inner diameter such that, when the tube 10 is accommodated in the space formed by the inner circumferential surface 62, the inner circumferential surface 62 comes into contact with the outer circumferential surfaces 20a of the plurality of grid elements 20, and the tube 10 is press-fitted into the space formed by the inner circumferential surface 62. In this manner, the tube 10 is press-fitted and fixed into the cover 61, and is fixed to the first frame 60. Note that the inner circumferential surface 62 of the cover 61 may have a size (inner diameter) such that, when the tube 10 is accommodated in the space formed by the inner circumferential surface 62, the inner circumferential surface 62 does not come into contact with the outer circumferential surfaces 20a of the plurality of grid elements 20, and an annular gap is formed between the inner circumferential surface 62 and the outer circumferential surfaces 20a of the plurality of grid elements 20. In this case, the tube 10 is fixed to the first frame 60 by, for example, bonding using an adhesive. Also, as shown in Figures 11 and 12, an annular flange 61a that protrudes inward is provided at the front end of the inner circumferential surface 62 in the direction of the axis x. When the tube 10 is housed in the space formed by the inner circumferential surface 62, the first end 12 of the tube 10 may come into contact with the flange 61a of the cover 61.

[0037] 12 and 13 , the first frame 60 has an attachment portion 64 that is attached to an external device as an application target. The attachment portion 64 is provided, for example, on the outer peripheral surface 63 of the cover 61 and protrudes outward from the cover 61. The attachment portion 64 is provided, for example, at the rear end of the cover 61 in the direction of the axis x. The attachment portion 64 also has a hole portion (hereinafter referred to as a "through hole") 64a through which a fixing member such as a bolt is passed, allowing the attachment portion 64 to be attached to an external device via the fixing member. The first frame 60 has, for example, three attachment portions 64. However, the number of attachment portions 64 provided on the first frame 60 is not limited thereto. The through hole 64 may have a metal collar (not shown).

[0038] 5, 12, and 13, the cover 61 has, for example, an opening 65 that forms an opening that radially penetrates a part of the cover 61. As will be described later, the opening 65 is an opening for allowing ends 32 of magnet wires 31 that form multiple coils 30 provided in a tube 10 fixed to the frame 6 to extend outside the cover 61.

[0039] 12 and 13 , the first frame 60 has connecting portions 66 that protrude radially. The connecting portions 66 support the substrate 9, which will be described later. The connecting portions 66 are formed of a conductor and are electrically connectable to the substrate 9. The connecting portions 66 may be coated with an insulating material (an insulating film or a coating). For example, as shown in FIGS. 12 and 13 , the connecting portions 66 are provided on the cover 61 and are located adjacent to the opening 65 in the direction of the axis x. The connecting portions 66 are members that electrically connect both ends of the excitation circuit 8 to the substrate 9, and two connecting portions 66 are provided on the first frame 60. As shown in FIGS. 4 and 5 , an annular groove 67 recessed toward the inner periphery is formed on the outer circumferential surface 63 of the cover 61. The groove 67 houses an excitation circuit 8a, which is one of the excitation circuits 8. The excitation circuit 8a is formed by winding a conductor in the groove 67, and both ends 8a1 and 8a2 of the excitation circuit 8a, which are both ends of the conductor, are fixed to the connecting portion 66, as shown in Fig. 4. The ends 8a1 and 8a2 of the excitation circuit 8a are each electrically connected to the connecting portion 66. In addition, the first frame 60 is formed with a recess 68 at a position adjacent to the connecting portion 66 in the direction of the axis x, which forms a gap between two adjacent mounting portions 64. The recess 68 forms a space in which a substrate 9, which will be described later, extends in the direction of the axis x.

[0040] The second frame 70 has, for example, a configuration similar to that of the first frame 60. As shown in FIGS. 14 and 15 , the second frame 70 has a cover 71 that partially covers the multiple outer coils 30 attached to the tube 10. The cover 71 is, for example, a cylindrical portion corresponding to the tube 10. The cover 71 is also formed, for example, so that the tube 10 is fixed thereto. The cover 71 forms, for example, a space capable of accommodating a portion of the tube 10 with a predetermined width in the axial x direction from the second end 13, and has an inner circumferential surface 72 that defines this space. This predetermined width is, for example, half or approximately half the width of the tube 10 in the axial x direction. The cover 71 also has an outer circumferential surface 73 that faces away from the inner circumferential surface 72 on the outer peripheral side. The inner circumferential surface 72 is a cylindrical surface extending along the axis x, and the inner circumferential surface 72 extends, for example, on a cylindrical surface with the axis x as its central axis. Specifically, the inner circumferential surface 72 of the cover 71 is formed to be able to accommodate the plurality of grid elements 20 on the side surface 11 of the tube 10, and is configured to radially oppose the outer circumferential surfaces 20a of the plurality of grid elements 20 when the tube 10 is accommodated in the space formed by the inner circumferential surface 72. The inner circumferential surface 72 of the cover 71 has an inner diameter such that, when the tube 10 is accommodated in the space formed by the inner circumferential surface 72, the inner circumferential surface 72 comes into contact with the outer circumferential surfaces 20a of the plurality of grid elements 20, and the tube 10 is press-fitted into the space formed by the inner circumferential surface 72. In this manner, the tube 10 is press-fitted and fixed into the cover 71, and is then fixed to the second frame 70. Note that the inner circumferential surface 72 of the cover 71 may have a size (inner diameter) such that, when the tube 10 is accommodated in the space formed by the inner circumferential surface 72, the inner circumferential surface 72 does not come into contact with the outer circumferential surfaces 20a of the plurality of grid elements 20, and an annular gap is formed between the inner circumferential surface 72 and the outer circumferential surfaces 20a of the plurality of grid elements 20. In this case, the tube 10 is fixed to the second frame 70 by, for example, bonding using an adhesive. Also, as shown in Figures 14 and 15, an annular flange 71a that protrudes inward is provided at the front end of the inner circumferential surface 72 in the direction of the axis x. When the tube 10 is housed in the space formed by the inner circumferential surface 72, the second end 13 of the tube 10 may come into contact with the flange 71a of the cover 71.

[0041] As shown in FIGS. 14 and 15 , the second frame 70 has an attachment portion 74 that is attached to an external device. The attachment portion 74 is provided, for example, on the outer peripheral surface 73 of the cover 71 and protrudes radially outward from the cover 71. The attachment portion 74 is provided, for example, at the rear end of the cover 71 in the direction of the axis x. The attachment portion 74 also has a hole 74a (hereinafter referred to as a "through hole") through which a fastening member such as a bolt is passed, allowing the attachment portion 74 to be attached to an external device via the fastening member. The through hole 74 may have a metal collar (not shown). The first frame 70 has, for example, three attachment portions 74. The number of attachment portions 74 on the second frame 70 is not limited to this. For example, as shown in FIGS. 4 and 5 , the attachment portion 74 of the second frame 70 is configured to contact the attachment portion 64 of the first frame 60 in the direction of the axis x.

[0042] As shown in FIGS. 14 and 15 , the second frame 70 has connecting portions 75 that protrude radially. The connecting portions 75 support the substrate 9, which will be described later. The connecting portions 75 are formed of a conductor and are electrically connectable to the substrate 9. The connecting portions 75 may be covered with an insulating material (an insulating film or a coating). As shown in FIGS. 14 and 15 , the connecting portions 75 are provided on the cover 71, for example. The connecting portions 75 are members for electrically connecting both ends of the excitation circuit 8 to the substrate 9, and two connecting portions 75 are provided on the second frame 70. The number of connecting portions 75 provided on the second frame 70 is not limited to this, and the number of connecting portions 75 may be one, three, or more. As shown in FIGS. 4 and 14 , an annular groove 76 recessed toward the inner periphery is formed on the outer circumferential surface 73 of the cover 71. The groove 76 houses an excitation circuit 8b, one of the excitation circuits 8. The excitation circuit 8b is formed by winding a conductor in the groove 76, and both ends of the conductor, i.e., ends 8b1 and 8b2 of the excitation circuit 8b, are each fixed to the connecting portion 75 (see FIG. 4). The ends 8b1 and 8b2 of the excitation circuit 8b are each electrically connected to the connecting portion 75. In addition, the second frame 70 is formed with a recess 77 at a position adjacent to the connecting portion 75 in the direction of the axis x, which recess 77 forms a gap between two adjacent mounting portions 74. The recess 77 forms a space in which the substrate 9 (described later) extends in the direction of the axis x. The size of the gap formed by the recess 77 is the same as or approximately the same as the size of the gap formed by the recess 68 of the first frame 60.

[0043] 5 , 14 , and 15 , unlike the cover 61 of the first frame 60, the cover 71 of the second frame 70 does not have an opening penetrating the cover 71. However, the cover 71 of the second frame 70 may have an opening that forms an opening penetrating the cover 71, similar to the opening 65 of the cover 61 of the first frame 60. In this case, the opening is provided, for example, at a position adjacent to the connecting portion 75 in the direction of the axis x. Furthermore, when an opening is provided in the second frame 70, the cover 61 of the first frame 60 does not need to have an opening 65. Similar to the opening 65 of the first frame 60, the opening provided in the cover 71 of the second frame 70 is an opening for allowing the ends 32 of the magnet wires 31 that form the multiple coils 30 to extend outside the cover 71.

[0044] The first frame 60 and the second frame 70 are each integrally molded from, for example, the same material. The first frame 60 and the second frame 70 are insulating members, such as resin members. The first frame 60 and the second frame 70 are made from, for example, a resin material, a non-magnetic material, or a non-conductive material. The non-magnetic material may be non-conductive. The material of the first frame 60 and the second frame 70 may be the same as the material of the tube 10. Any or all of the components of the first frame 60 and the second frame 70 may be formed as separate bodies. In this case, the first frame 60 and the second frame 70 are each formed by assembling the components formed as separate bodies by adhesive or the like.

[0045] 16 is a cross-sectional view showing the stator 3 in an assembled state in which the tube 10 is fixed to the frame 6 (first frame 60 and second frame 70) and the tube 10 and frame 6 are assembled. FIG. 16 shows a cross section taken along a plane including the axis x of the tube 10 and frame 6 in the assembled state. As shown in FIG. 16 , in the assembled stator 3, the portion of the tube 10 on the first end 12 side is accommodated in the space formed by the inner circumferential surface 62 of the cover 61 of the first frame 60, and the portion of the tube 10 on the second end 13 side is accommodated in the space formed by the inner circumferential surface 72 of the cover 71 of the second frame 70, so that the tube 10 is fixed to the frame 6. Furthermore, in the assembled stator 3, the mounting portion 64 of the first frame 60 and the mounting portion 74 of the second frame 70 are connected in contact with each other in the direction of the axis x, and the covers 61 and 71 are also connected in contact with each other in the direction of the axis x. Furthermore, the recess 68 of the first frame 60 and the recess 77 of the second frame 70 overlap in the direction of the axis x. As described above, the tube 10 is fixed to the frame 6 by, for example, engagement, fitting, or bonding. The tube 10 may also be fixed to the frame 6 by, for example, adhesive. However, the fixing structure of the tube 10 to the frame 6 is not limited to these structures.

[0046] As shown in FIG. 16 , in the assembled stator 3, the entire tube 10 is covered by the cover 61 and the cover 71 in the axial x direction. That is, the width of the connected inner circumferential surface 62 of the cover 61 and the inner circumferential surface 72 of the cover 71 in the axial x direction is the same as or larger than the width of the tube 10 in the axial x direction. However, in the assembled stator 3, the entire tube 10 does not have to be covered by the cover 61 and the cover 71 in the axial x direction. That is, the width of the connected inner circumferential surface 62 of the cover 61 and the inner circumferential surface 72 of the cover 71 in the axial x direction may be smaller than the width of the tube 10 in the axial x direction. In this case, the flanges 61 a, 71 a are not provided on at least one of the covers 61, 71. Also, in the assembled stator 3, the cover 61 and the cover 71 may not be connected in the axial x direction and may face each other with a gap therebetween. In this manner, in the assembled stator 3, the multiple coils 30 formed on the side surface 11 of the tube 10 are covered by the frame 6. Therefore, the coil structure 7 can be protected without protecting it with potting or the like, and contact of objects with the coil structure 7 can be prevented.

[0047] 16 , in the assembled stator 3, the first end 12 of the cylinder 10 contacts the flange 61 a of the cover 61 of the first frame 60 in the direction of the axis x, and similarly, the second end 13 of the cylinder 10 contacts the flange 71 a of the cover 71 of the second frame 70. Note that the first end 12 of the cylinder 10 does not have to contact the flange 61 a. Also, the second end 13 of the cylinder 10 does not have to contact the flange 71 a of the cover 71 of the second frame 70.

[0048] As shown in FIGS. 2 to 5 , the angle sensor 1 includes a substrate 9, which is attached to the stator 3. The substrate 9 is an electric circuit device having a circuit section and a calculation section. The substrate 9 is, for example, a printed circuit board (PCB) and includes electronic components, wiring, and lands serving as terminals. As shown in FIGS. 2 to 5 , the substrate 9 is supported by, for example, a connecting portion 15 that protrudes outward through an opening 65 in the first frame 60 of the stator 3 and a connecting portion 66 of the first frame 60. The connecting portions 15 and 66 each support the substrate 9 by, for example, penetrating the substrate 9 or by having their tips embedded in the substrate 9. Note that the supporting form of the connecting portions 15 and 66 for the substrate 9 is not limited to this. For example, adhesive bonding or other supporting forms can be used. Furthermore, the substrate 9 can also be supported by, for example, a connector (not shown) or a fixing portion (not shown) of the first frame 60. Furthermore, the substrate 9 passes through the gap formed by, for example, the recess 68 of the first frame 60 and the recess 77 of the second frame 70 .

[0049] Furthermore, each of the four connecting portions 15 is electrically connected to a corresponding land, for example. As a result, the end 32 of the magnet wire 31 drawn from the coil 30 is electrically connected to the land on the substrate 9, electrically connecting the magnet wire 31 (coil 30) to each component of the substrate 9. Similarly, each of the two connecting portions 66 is electrically connected to a corresponding land. As a result, the ends 8a1 and 8a2 of the conductor drawn from the excitation circuit 8a are electrically connected to the land on the substrate 9, electrically connecting the excitation circuit 8a to each component of the substrate 9. Note that the connecting portions 15 and 66 may not be electrically connected directly to the land on the substrate 9, but may be electrically connected via another conductive member.

[0050] The substrate 9 may be supported by the connecting portion 75 of the second frame 70 instead of the connecting portion 66 of the first frame 60. The substrate 9 may also be supported by the connecting portion 75 in addition to the connecting portions 15 and 66.

[0051] 1 to 4, in the angle sensor 1, the rotor 2 is housed in a space surrounded by the inner peripheral surface 14 of the cylinder 10 of the stator 3. The outer peripheral surface 42 of the rotor 2 faces radially to the inner peripheral surface 14 of the cylinder 10 of the stator 3, with an annular space between them, and the multiple metal bodies 5 of the rotor 2 face radially to the multiple coils 30 fitted in the lattice grooves 21 formed by the multiple lattice bodies 20 of the cylinder 10 of the stator 3. In this way, the rotor 2 and the stator 3 form an inductive angle sensor, and the multiple coils 30 form detection coils. In addition, a magnetic space or magnetic gap is formed between the rotor 2 and the stator 3.

[0052] In the angle sensor 1, a radially directed magnetic flux whose magnitude periodically changes acts on the multiple coils 30. Specifically, as described above, the frame 6 of the stator 3 is provided with the excitation circuit 8 (8a, 8b) (see FIG. 4 ), and the excitation circuit 8 is a magnetic circuit that generates a periodically changing magnetic flux acting on the multiple coils 30. Meanwhile, as described above, the multiple metal bodies 5 are arranged in the circumferential direction around the axis x and cross the magnetic flux generated by the excitation circuit 8 as the rotor 2 rotates. Furthermore, the projection of the metal body 5, which has a portion extending along the axis x, onto the coils 30 in the radial direction moves as the rotor 2 rotates. Therefore, the magnetic flux from the excitation circuit 8 acting on each of the multiple coils 30 is affected by eddy currents generated in the metal bodies 5 and cancels out, periodically changing as the rotor 2 rotates. As a result, in the plurality of coils 30, an electromotive force is generated by electromagnetic induction which changes with the rotation of the rotor 2, and signals which change with the rotation of the rotor 2 are detected from the plurality of coils 30. Based on the detection signals from the plurality of coils 30, the rotation angle of the rotor 2 is detected in an external electric circuit device.

[0053] The angle sensor 1 according to this embodiment has the above-described configuration, in which the conductor wires 31 fit into the lattice grooves 21 formed by the lattice elements 20, forming the plurality of coils 30 in the desired shape according to the contours of the lattice element group 50 along which the conductor wires 31 are aligned. In this manner, the angle sensor 1 can accurately form the plurality of coils 30 in the desired shape, and can prevent the plurality of coils 30 from having a shape different from the desired shape. This can prevent variations in the detection signals output from the plurality of coils 30, thereby improving the detection accuracy of the angle sensor 1. This can prevent fluctuations in the correction value of the detection signal in the electronic components on the substrate 9.

[0054] Furthermore, according to the angle sensor 1, the coil 30 can be easily formed in a desired shape, thereby improving the productivity of the plurality of coils 30. Furthermore, by arbitrarily selecting the grid elements 20 constituting the grid element group 50 from the plurality of grid elements 20, the variation in the contour shape of the grid element group 50 can be increased. This makes it possible to easily produce coils 30 in various shapes. Furthermore, by including grid elements of a plurality of shapes in the plurality of grid elements 20, the variation in the contour shape of the grid element group 50 can be increased.

[0055] In this way, the angle sensor 1 according to the embodiment of the present invention can improve detection accuracy.

[0056] The frame 6 may include either a first frame 60 or a second frame 70. In this case, the cylinder 10 is housed in the inner peripheral surface 62 of the cover 61 of the first frame 60 or the inner peripheral surface 72 of the cover 71 of the second frame 70, as in the case described above. The angle sensor 1 may also include either an excitation circuit 8a or an excitation circuit 8b as the excitation circuit 8.

[0057] Although the present invention has been described above through the above embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention.

[0058] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the scope of the present invention. Furthermore, the above-described embodiments do not limit the scope of the present invention, and the present invention may include any and all applications. The components of the above-described embodiments, as well as their arrangement, materials, conditions, shape, size, etc., are not limited to those illustrated and may be modified as appropriate. For example, the present invention includes differences that arise during implementation due to manufacturing tolerances, etc. Furthermore, components illustrated in different embodiments may be partially substituted or combined within the scope of technical inconsistency. Furthermore, the various configurations may be selectively combined as appropriate to achieve at least some of the above-described problems and effects.

[0059] REFERENCE SIGNS LIST 1 Angle sensor, 2 Rotor (rotating body), 3 Stator, 4 Conductor structure, 5 Metal body (conductor), 6 Frame, 7 Coil structure, 7a, 7b Coil structure pieces, 8, 8a, 8b Excitation circuit, 8a1, 8a2, 8b1, 8b2 End, 9 Substrate, 10 Cylinder, 11 Side, 12 First end, 13 Second end, 14 Inner peripheral surface, 15 Connecting portion, 20 Grid, 20a Outer peripheral surface, 21 Grid groove, 21a First direction groove, 21b Second direction groove, 22 First Grid, 22a, 22b Inner surface, 22c Outer surface, 22d First protrusion, 23 Second Grid, 23a, 23b Inner surface, 23c Outer surface, 23d Second protrusion, 24 Third Grid, 24a, 24b, 24c, 24d Outer surface, 24e: third protrusion, 30, 30a, 30b: coil, 31, 31a, 31b: conducting wire, 32, 32a1, 32a2, 32, 32b1, 32b2: end, 40: cylinder, 41: inner peripheral surface, 42: outer peripheral surface, 43, 44: end surface, 50: grid group, 60: first frame, 61: cover, 61a: flange, 62: inner peripheral surface, 63: outer peripheral surface, 64: mounting portion, 65: opening, 66: connecting portion, 67: groove, 68: recess, 70: second frame, 71: cover, 71a: flange, 72: inner peripheral surface, 73: outer peripheral surface, 74: mounting portion, 75: connecting portion, 76: groove, 77: recess, x: axis

Claims

1. An angle sensor comprising: a cylinder having a side surface extending in the circumferential direction; and a coil fixed to the side surface, wherein a plurality of lattice bodies arranged in the circumferential direction and the axial direction are provided on the side surface of the cylinder, and a conducting wire forming the coil is fitted in a gap between the plurality of lattice bodies.

2. The angle sensor according to claim 1, wherein the side surface extends in the axial direction.

3. The side surface has a first end portion and a second end portion in the axial direction, the plurality of lattice bodies includes a first lattice body on the first end portion side of the side surface, and the first lattice body includes a first protruding portion protruding in the axial direction. The angle sensor according to claim 1 or 2.

4. The angle sensor according to claim 3, wherein the first protruding portion supports the conducting wire.

5. The plurality of lattice bodies includes a second lattice body on the second end portion side of the side surface, and the second lattice body includes a second protruding portion protruding in the axial direction. The angle sensor according to claim 4.

6. The angle sensor according to claim 5, wherein the second protruding portion supports the conducting wire.

7. The angle sensor according to any one of claims 1 to 6, further comprising a substrate provided on the side surface, wherein a connecting portion protruding in the radial direction is provided on the side surface, and the connecting portion supports the substrate.

Images