Inductive position sensor

Abstract

The utility model relates to an inductance type position sensor which comprises an induction coil, the induction coil is provided with inflection points changing the extending direction of the induction coil, and a line body part between any two adjacent inflection points of the induction coil is in a straight line shape. Therefore, the line body part between any two adjacent inflection points of the induction coil is linear, so that the problems of high processing difficulty and high manufacturing cost caused by designing the induction coil into a curve shape or an arc shape in the prior art can be reduced, and the outline of the induction coil can be conveniently scribed on a PCB (Printed Circuit Board); the processing difficulty of the induction coil is reduced, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of position sensors, and in particular, to an inductive position sensor. Background Art

[0002] In the related art, the inductive position sensor usually contains an excitation coil, an induction coil pair and a conductive moving target. The excitation coil and the induction coil are usually arranged on a PCB board, wherein the marking and processing of the induction coil are difficult and the production cost is high. Utility Model Content

[0003] The purpose of the present disclosure is to provide an inductive position sensor, which has low processing difficulty and low production cost, so as to at least partially solve the problems in the related art.

[0004] In order to achieve the above-mentioned object, the present disclosure provides an inductive position sensor, including an induction coil, wherein the induction coil has an inflection point for changing its extension direction, and a line portion between any two adjacent inflection points of the induction coil is in a straight line shape.

[0005] Optionally, the induction coil includes an outbound coil and a return coil, the end of the outbound coil is connected to the head end of the return coil, the outbound coil includes one or more first periodic structures connected in sequence along a preset outbound direction, the return coil includes one or more second periodic structures connected in sequence along a return direction opposite to the outbound direction, the inflection point includes at least one intermediate inflection point located between the two ends of the first periodic structure or the second periodic structure, and the first periodic structure and the second periodic structure each form a multi-straight edge structure through its own at least one intermediate inflection point.

[0006] Optionally, in the outward direction and the return direction in the circumferential direction around the central axis, the multi-straight-edge structure is a V-shaped structure.

[0007] Optionally, the inflection point includes a connecting inflection point connecting two adjacent first periodic structures or connecting two adjacent second periodic structures, the first radial distance between the intermediate inflection point of each first periodic structure and the central axis is the same, the second radial distance between the intermediate inflection point of each second periodic structure and the central axis is the same, the first radial distance is equal to the second radial distance; the third radial distance between each connecting inflection point and the central axis is the same.

[0008] Optionally, it further includes a first excitation coil, which is arranged circumferentially around the central axis, the first radial distance is greater than the third radial distance, and the maximum outer diameter of the first excitation coil is less than the first radial distance.

[0009] Optionally, there is a fourth radial distance between the connection between the end of the outbound coil and the beginning of the return coil and the central axis, and the fourth radial distance is greater than the third radial distance and less than the first radial distance.

[0010] Optionally, it also includes a rotor, which is arranged at intervals with the induction coil along the central axis, and the rotor has a first conductive target area, the first conductive target area has two side edges symmetrical about its own radial center line, the radial center line intersects with the central axis, the projections of the outbound coil and the return coil along the central axis have a plurality of intersections arranged at intervals along the circumferential direction, and there is an intermediate inflection point between two adjacent intersections, and the first conductive target area is constructed so that when the projection of the radial center line on the central axis passes through the intermediate inflection point, the projections of the two side edges on the central axis respectively pass through two adjacent intersections symmetrical about the radial center line.

[0011] Optionally, the outward direction and the return direction are straight line directions, and the multi-straight-line edge structure is an N-shaped structure.

[0012] Optionally, the outbound coil and the return coil are arranged symmetrically about a symmetry line parallel to the straight line direction, and the at least one intermediate inflection point includes an adjacent first inflection point and a second inflection point located in the outbound coil or the return coil, the first inflection point is located on one side of the symmetry line, and the second inflection point is located on the other side of the symmetry line.

[0013] Optionally, it also includes a second excitation coil, which encloses a rectangular area, and the projection of the induction coil on a plane perpendicular to the rectangular area is located within the rectangular area or coincides with the second excitation coil; and / or, it also includes a moving part adapted to the second excitation coil, and the moving part can move in a straight line along the extension direction of the symmetry line.

[0014] Optionally, the electromagnetic position sensor also includes a circuit board having a multi-layer board body, the induction coil is arranged on the circuit board, the inflection point includes a through hole passing through at least one layer of the board body, and the induction coil passes through the through hole so that the two wire body parts located on both sides of the inflection point are respectively located on opposite sides of the at least one layer of the board body.

[0015] Through the above technical solution, the induction coil has an inflection point that changes its own extension direction. By making the line part between any two adjacent inflection points of the induction coil straight, it is possible to reduce the problems of high processing difficulty and high manufacturing cost caused by designing the induction coil into a curved or arc shape in the related art, so as to facilitate marking the outline of the induction coil on the PCB board, reduce the processing difficulty of the induction coil and reduce the manufacturing cost.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 is a schematic structural diagram of the outbound coil provided in the first exemplary embodiment of the present disclosure;

[0019] Figure 2 is a schematic structural diagram of a return coil provided in the first exemplary embodiment of the present disclosure;

[0020] Figure 3 is a simplified structural diagram of an induction coil provided in the first exemplary embodiment of the present disclosure;

[0021] Figure 4 is a schematic diagram of the positional relationship between the first excitation coil and the two induction coils provided in the first exemplary embodiment of the present disclosure;

[0022] Figure 5 is a schematic diagram of a rotor provided in the first exemplary embodiment of the present disclosure;

[0023] Figure 6 is the induced voltage envelope of each induction coil obtained according to the first exemplary embodiment of the present disclosure;

[0024] Figure 7 is a schematic diagram of the positional relationship between the rotor and the induction coil provided in the first exemplary embodiment of the present disclosure;

[0025] Figure 8 is a simplified structural diagram of an induction coil provided in the second exemplary embodiment of the present disclosure;

[0026] Fig. 9 is a schematic diagram of the positional relationship between the induction coil and the second excitation coil provided in the second exemplary embodiment of the present disclosure;

[0027] Fig.10is a schematic diagram of the positional relationship between the moving member, the induction coil and the second excitation coil provided in the second exemplary embodiment of the present disclosure;

[0028] Fig.11 is a schematic diagram of the positional relationship between the induction coil and the second excitation coil provided in the third exemplary embodiment of the present disclosure;

[0029] Fig.12 1 is a simplified schematic diagram of the positional relationship among the moving member, the induction coil and the second excitation coil provided in the third exemplary embodiment of the present disclosure.

[0030] Description of Reference Numerals

[0031] 1-induction coil; 11-outbound coil; 12-return coil; 13-first periodic structure; 14-second periodic structure; 15-multi-straight edge structure; 16-intersection; 2-inflection point; 21-middle inflection point; 22-connection inflection point; 23-first inflection point; 24-second inflection point; 3-first excitation coil; 4-rotor; 41-first conductive target area; 411-side edge; 5-second excitation coil; 6-moving part; 7-circuit board; 71-board body. DETAILED DESCRIPTION

[0032] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0033] In the present disclosure, unless otherwise stated, the terms "first", "second", etc. used in the present disclosure are intended to distinguish one element from another element and do not have order or importance. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0034] like Figure 1-Figure 12 As shown, the present disclosure provides an inductive position sensor, including an induction coil 1, wherein the induction coil 1 has an inflection point 2 for changing its own extension direction, and the line portion between any two adjacent inflection points 2 of the induction coil 1 is in a straight line shape.

[0035] Through the above technical solution, by making the line part between any two adjacent inflection points 2 of the induction coil 1 straight, it is possible to reduce the problems of high processing difficulty and high manufacturing cost caused by designing the induction coil into a curved / arc shape as in the related art, so as to facilitate marking and processing the outline of the induction coil 1 on the PCB board, thereby reducing the processing difficulty of the induction coil 1 and reducing the manufacturing cost.

[0036] It is understandable that if Figure 7As shown, the above-mentioned inductive position sensor also includes a circuit board 7 having a multi-layer board body 71, the circuit board 7 can be a PCB board, the induction coil 1 is arranged on the circuit board 7, the inflection point 2 includes a through hole penetrating at least one layer of the board body 71, and the induction coil 1 penetrates the through hole so that the two line parts located on both sides of the inflection point 2 are respectively located on the opposite sides of at least one layer of the board body 71, so that the outbound coil 11 and the return coil 12 in the induction coil 1 can avoid contact at other positions except the connection point at the end, thereby improving the measurement accuracy, wherein the outbound coil 11 and the return coil 12 will be described below. In addition, in order to avoid mutual interference between the inflection points 2 in the induction coil 1, the distance between the two closest inflection points 2 on the PCB board needs to be greater than or equal to 0.15mm.

[0037] In addition, the above-mentioned inductive position sensor also includes an excitation coil matched with the induction coil 1 and a target used in combination with the excitation coil and the induction coil. The excitation coil is driven to form a magnetic field. The excitation coil can be driven within a certain frequency range or a specific frequency. The target used in combination with the excitation coil and the induction coil can move relative to the excitation coil, so that the target can generate an eddy current effect. The induction coil generates different induced voltages based on the movement of the target. Among them, the shapes of the excitation coil, the induction coil and the target can be selected accordingly according to the type of the inductive position sensor. For example, when the inductive position sensor is a rotary position sensor used for detecting rotating motors, rotating shafts and other scenes, the excitation coil can be constructed as a circular ring, the induction coil is arranged concentrically with the excitation coil around the center of the circular ring, and the target can be constructed as a rotor with a suitable shape in order to adapt to the excitation coil; when the inductive position sensor is a linear position sensor used for linear motors, accelerator pedals and other scenes, the excitation coil can be constructed as a rectangular shape, the induction coil can be arranged in a straight line direction, the target can be a rectangular shape or any other suitable shape, and the target can move back and forth in the straight line direction.

[0038] In some embodied embodiments, the induction coil 1 includes a forward coil 11 and a return coil 12, the end of the forward coil 11 is connected to the head end of the return coil 12 to form the induction coil 1, the forward coil 11 includes one or more first periodic structures 13 sequentially connected along a preset forward direction, and the return coil 12 includes one or more second periodic structures 14 sequentially connected along a return direction opposite to the forward direction. The forward direction and the return direction may depend on the type of the inductive position sensor. For example, when the inductive position sensor is applied to a rotary position sensor, the forward direction and the return direction may be circumferential around the central axis A. For example, the forward direction may refer to Figure 1 In the direction of the arrow in FIG. 1 , at this time, the plurality of first periodic structures 13 are arranged along Figure 1 Connect in the direction of the arrows shown; for the return direction, refer to Figure 2 In the direction of the arrow shown, at this time, the plurality of second periodic structures 14 can be arranged along Figure 2 In addition, when the inductive position sensor is applied to a linear position sensor, the forward direction and the return direction can be linear directions. For example, the forward direction can refer to Figure 8 In the direction of the arrow, Figure 8 Only one first periodic structure 13 is exemplarily shown in the figure. It can be understood that multiple first periodic structures 13 can also be arranged. The multiple first periodic structures 13 can be arranged along Figure 3 Connect in the direction of the arrows shown in the figure; for the return direction, refer to Figure 8 In the direction opposite to the arrow direction, Figure 8 Only one second periodic structure 14 is shown exemplarily. It is understandable that multiple second periodic structures 14 may be arranged. Figure 8 In some practicable embodiments, the first periodic structure 13 and the second periodic structure 14 may be identical, and the more the first periodic structure 13 and the second periodic structure 14 are repeated, the more the number of received signals obtained within the measured range is, and the more accurate the measured position is.

[0039] When the inductive position sensor is applied to the rotary position sensor, in order to facilitate the processing and manufacturing of the induction coil, in some practicable embodiments, the inflection point 2 includes at least one intermediate inflection point 21 located between the two ends of the first periodic structure 13 or the second periodic structure 14, and the first periodic structure 13 and the second periodic structure 14 each form a multi-straight edge structure 15 through at least one intermediate inflection point 21 thereof, for example, Figure 1 In the embodiment, the outbound coil 11 includes a starting point, an end point, and a plurality of inflection points 2 arranged between the starting point and the end point. The starting point and the inflection point 2, the adjacent inflection points 2, and the inflection point 2 and the end point are connected by straight wires. The first periodic structure 13 of the outbound coil 11 includes one of the middle inflection points 21 and two straight wires connected to the middle inflection point 21. The two straight wires and the middle inflection point 21 form a multi-straight edge structure 15. Figure 2In the figure, the return coil 12 also includes a starting point, an end point and a plurality of inflection points 2 arranged between the starting point and the end point. The starting point and the inflection point 2, the adjacent inflection points 2, and the inflection point 2 and the end point are connected by straight wires respectively. The second periodic structure 14 of the return coil 12 is the same as the first periodic structure 13, and also includes an intermediate inflection point 21 and two straight wires connected to the intermediate inflection point 21. The two straight wires and the intermediate inflection point 21 form a multi-straight edge structure 15, so that the connection between the plurality of straight wires and the inflection points 2 forms the outbound coil 11 and the return coil 12 in the induction coil 1, so as to facilitate the marking of the induction coil 1 on the PCB board for subsequent processing.

[0040] In addition, when the inductive position sensor is applied to the linear position sensor, in order to facilitate the processing and manufacturing of the induction coil, in some practicable ways, such as Figure 8 As shown, the first periodic structure 13 in the outbound coil 11 includes two intermediate inflection points 21 and straight conductors respectively connected to the two intermediate inflection points 21, the two intermediate inflection points 21 are arranged at intervals, and the two intermediate inflection points 21 and the three straight conductors form a multi-straight edge structure 15, and the second periodic structure 14 in the return coil 12 includes two intermediate inflection points 21 and straight conductors respectively connected to the two intermediate inflection points 21, the two intermediate inflection points 21 are arranged at intervals, and the two intermediate inflection points 21 and the three straight conductors form a multi-straight edge structure 15.

[0041] The present disclosure exemplarily provides two embodiments.

[0042] In the first embodiment, reference Figure 1-Figure 7 An inductive position sensor for a rotary position sensor includes two induction coils 1, a first excitation coil 3 and a target, wherein the target is a rotor 4, the first excitation coil 3 and the two induction coils 1 are respectively located on different layers of a circuit board 7, the induction coil 1 and the first excitation coil 3 are thin film conductors, and the two induction coils 1 are staggered by a preset angle along the circumferential direction of a central axis A, wherein the preset angle θ can be set by the following formula:

[0043] θ=360° /

[0044] Wherein, N is the period number of the induction coil, and M is the number of the induction coils.

[0045] Among them, Figure 3 As shown, the two induction coils 1 have the same structure and are arranged at a preset angle circumferentially staggered along the central axis A. Each induction coil 1 is opposite to the pole number of the rotor blade 4. Assuming that the period number N of the two induction coils 1 is 4 and the number of induction coils is 2, at this time, the offset angle θ between the two induction coils 1 is 22.5°.

[0046] The induction coil 1 and the first excitation coil 3 are arranged circumferentially around the same central axis A. The induction coil 1 includes a forward coil 11 and a return coil 12. The forward coil 11 includes a starting point, an end point, and a plurality of inflection points 2 arranged between the starting point and the end point. The starting point can be referred to as Figure 1 In F1, the end point can be referenced Figure 1 In E1, the starting point and the inflection point 2, the adjacent inflection points 2, and the inflection point 2 and the end point are connected by straight wires, respectively. The first periodic structure 13 includes an intermediate inflection point 21 and two straight wires connected to the intermediate inflection point 21. The two straight wires and the intermediate inflection point 21 form a multi-straight edge structure 15. Figure 2 In the embodiment, the return coil 12 also includes a starting point, an end point, and a plurality of inflection points 2 arranged between the starting point and the end point. The starting point can be referred to as Figure 2 Middle E2, the end point can refer to Figure 2 In F2, E1 and E2 overlap, and a via hole can be set at the overlapped position so that the induction coil passes through the via hole. The starting point of the return coil 12 and the inflection point 2, the adjacent inflection points 2, and the inflection point 2 and the end point are respectively connected by straight wires. The second periodic structure 14 of the return coil 12 also includes an intermediate inflection point 21 and two straight wires connected to the intermediate inflection point 21. The two straight wires and the intermediate inflection point 21 form a multi-straight edge structure 15, wherein the multi-straight edge structure 15 is a V-shaped structure. The V-shaped structure is simple and only requires two straight line segments and an intermediate inflection point 21 to be combined to form, which is convenient for marking and manufacturing the induction coil 1.

[0047] Of course, the V-shaped structure of the multi-straight-line edge structure 15 is schematic. In other embodiments, the multi-straight-line edge structure 15 can also be constructed into other structures. For example, the multi-straight-line edge structure 15 can also be constructed into a "X" shape.

[0048] In some practicable embodiments, in order to facilitate the marking of the induction coil 1 on the PCB board and at the same time enhance the induced voltage received by the induction coil 1, the inflection point 2 includes a connecting inflection point 22 connecting two adjacent first periodic structures 13 or connecting two adjacent second periodic structures 14, the first radial distance between the intermediate inflection point 21 of each first periodic structure 13 and the central axis A is the same, the second radial distance between the intermediate inflection point 21 of each second periodic structure 14 and the central axis A is the same, and the first radial distance is equal to the second radial distance, so that the multiple intermediate inflection points 21 are located on a concentric circle, which is convenient for positioning and processing; the third radial distance between each connecting inflection point 22 and the central axis A is the same, the first radial distance is greater than the third radial distance, and the maximum outer diameter of the first excitation coil 3 is less than the first radial distance, such as Figure 3As shown, each induction coil 1 has 8 intermediate inflection points 21 and 8 connecting inflection points 22, and the intermediate inflection points 21 are located outside the outer diameter of the first excitation coil 3, and the connecting inflection points 22 are located inside the outer diameter of the first excitation coil 3, so that the projection of the induction coil 1 perpendicular to the central axis A can cover the first excitation coil 3, thereby increasing the coupling ability between the first excitation coil 3 and the induction coil 1, enhancing the ability of the induction coil 1 to receive the induced voltage, and improving the measurement accuracy.

[0049] In order to improve the coupling strength between the induction coil 1 and the first excitation coil 3, in some feasible embodiments, there is a fourth radial distance between the connection between the end of the outbound coil 11 and the beginning of the return coil 12 and the central axis A, and the fourth radial distance is greater than the third radial distance and less than the first radial distance. In this way, the projection of the induction coil 1 perpendicular to the central axis A can overlap with the first excitation coil 3 in a larger area, thereby improving the coupling ability between the first excitation coil 3 and the induction coil 1.

[0050] In order to make the area covered by the first conductive target region 41 corresponding to the induction coil 1 produce a sine or cosine change as the rotor 4 rotates, in some practicable ways, such as Figure 4-Figure 7 As shown, the rotor 4 is arranged with an interval from the induction coil 1 along the central axis A, and the rotor 4 has a first conductive target area 41. The first conductive target area 41 has two side edges 411 symmetrical about its own radial center line B. The radial center line B intersects the central axis A. The projections of the outbound coil 11 and the return coil 12 along the central axis A have a plurality of intersections 16 arranged at intervals along the circumferential direction, and there is an intermediate inflection point 21 between two adjacent intersections 16. The first conductive target area 41 is constructed so that when the projection of the radial center line B on the central axis passes through the intermediate inflection point 21, the projections of the two side edges on the central axis A respectively pass through two adjacent intersections 16 symmetrical about the radial center line B. As shown in FIG. Figure 4 As shown, the number of induction coils 1 is two, the number of first excitation coils 3 is one, when the first conductive target area 41 can completely cover the magnetic flux area surrounded by an adjacent middle inflection point 21, a connecting inflection point 22 and two intersection points 16 in the outgoing coil 11 and the return coil 12 in one of the induction coils 1, at this position, the peak value of the envelope of the induced voltage generated by the induction coil 1 reaches the maximum, as shown in FIG. Figure 6 As shown, the maximum peak value can reach 4.67 mV, while the induced voltage generated by the other induction coil 1 is 0. Therefore, through this arrangement, the induced voltage generated by the induction coil 1 can reach the maximum value and 0 value to ensure the measurement accuracy.

[0051] It should be noted that the projection of the induction coil 1 along the central axis A has a plurality of intersections 16 arranged at intervals along the circumferential direction. It can be understood that the induction coil 1 itself does not intersect, and only the projection in the axial direction has the intersection 16. Specifically, when the induction coil 1 is arranged on the PCB board, the two layers of the PCB board can be used for arrangement. For example, the board has vias, and the corresponding induction coil can be formed by passing the wires through the vias on the two layers of the board to avoid the induction coils themselves from intersecting.

[0052] In the second embodiment, refer to Figure 8-Figure 12 , an inductive position sensor for a linear position sensor, comprising two induction coils 1, a second excitation coil 5 and a moving part 6, wherein the second excitation coil 5 and the two induction coils 1 are respectively located on different layers of a circuit board 7, wherein the induction coil 1 and the second excitation coil 5 are both thin film wires, reference Figures 9 to 12 The connecting straight line of the induction coil 1 located on the front side of the board layer is represented by a solid line, and the connecting straight line of the induction coil 1 located on the back side of the board layer is represented by a dotted line. The second excitation coil 5 encloses a rectangular area. The projection of the induction coil 1 on the plane perpendicular to the rectangular area is located in the rectangular area or coincides with the second excitation coil 5, so that the induction coil 1 can be located in the magnetic field generated by the second excitation coil 5. The moving part 6 can also be a rectangular metal plate, and a second conductive target area is provided on the rectangular metal plate, and the area of ​​the second conductive target area covers at least one period of the induction coil 1. The moving part 6 can move back and forth in a straight line along the length direction of the second excitation coil 5, so that the induction coil 1 can obtain the induced voltage at different positions of the moving part 6.

[0053] In order to facilitate the marking and processing of the induction coil 1 on the PCB board, in some feasible methods, the first periodic structure 13 in the outbound coil 11 includes two intermediate inflection points 21 and straight wires respectively connected to the two intermediate inflection points 21, the two intermediate inflection points 21 are arranged at intervals, and the two intermediate inflection points 21 and the three straight wires form an N-shaped multi-straight line edge structure 15, and the second periodic structure 14 in the return coil 12 includes two intermediate inflection points 21 and straight wires respectively connected to the two intermediate inflection points 21, the two intermediate inflection points 21 are arranged at intervals, and the two intermediate inflection points 21 and the three straight wires form an N-shaped multi-straight line edge structure 15.

[0054] In order to improve the coupling strength between the induction coil 1 and the second excitation coil 5 and enhance the induced voltage received by the induction coil 1, in some practicable ways, such as Fig. 9 and Fig.10 As shown, the second excitation coil 5 forms a rectangular area, and the projection of the induction coil 1 on a plane perpendicular to the rectangular area is located within the rectangular area, as shown in FIG. Fig.11 and Fig.12As shown, the projection of the induction coil 1 on the plane perpendicular to the rectangular area coincides with the second excitation coil 5, so that the induction coil 1 can be located in the magnetic field of the second excitation coil 5. When the moving part 6 passes through the second excitation coil 5, the induced voltage received by the induction coil 1 can be enhanced, thereby improving the measurement accuracy.

[0055] In order to improve the measurement accuracy of the inductive position sensor, in some feasible embodiments, the outbound direction and the return direction of the induction coil 1 are linear directions, the outbound coil 11 and the return coil 12 are symmetrically arranged about a symmetry line C parallel to the linear direction, and at least one intermediate inflection point 21 includes an adjacent first inflection point 23 and a second inflection point 24 located in the outbound coil 11 or the return coil 12, the first inflection point 23 is located on one side of the symmetry line C, and the second inflection point 24 is located on the other side of the symmetry line C, thereby forming multiple magnetic flux areas, so that when the moving part 6 moves in a straight line, the induction coil 1 can obtain a large number of received signals within the measured range, thereby making the measured position more accurate.

[0056] In order to make the area covered by the corresponding second electric target region of the induction coil 1 produce a sine or cosine change with the linear motion of the moving member 6, in some practicable ways, such as Figure 8-Figure 12 As shown, the moving member 6 has a second conductive target area, and the projections of the outbound coil 11 and the return coil 12 on the plane of the symmetry line C have a plurality of intersections 16 arranged at intervals along the direction of the symmetry line C. The second conductive target area is configured to cover the magnetic flux area between two adjacent intersections 16 in the same induction coil. Fig.10 or Fig.12 As shown, there are two induction coils 1 and one second excitation coil 5. When the second conductive target area in the moving member 6 can completely cover the magnetic flux area between two adjacent intersections 16 in the same induction coil 1, at this position, the peak value of the envelope of the induced voltage generated by the induction coil 1 reaches the maximum, and at the same time, the induced voltage generated by the other induction coil 1 is 0. Therefore, through this arrangement, the induced voltage generated by the induction coil 1 can reach the maximum value and the 0 value to ensure the measurement accuracy.

[0057] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0059] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An inductive position sensor, characterized in that: The induction coil comprises an induction coil, wherein the induction coil has an inflection point for changing its extension direction, and a line portion between any two adjacent inflection points of the induction coil is in a straight line shape; The induction coil includes a forward coil and a return coil, the end of the forward coil is connected to the head end of the return coil, the forward coil includes one or more first periodic structures connected in sequence along a preset forward direction, the return coil includes one or more second periodic structures connected in sequence along a return direction opposite to the forward direction, the inflection point includes at least one intermediate inflection point located between the two ends of the first periodic structure or the second periodic structure, and the first periodic structure and the second periodic structure each form a multi-straight edge structure through their own at least one intermediate inflection point.

2. The inductive position sensor according to claim 1, characterized in that: In the outward direction and the return direction, in the circumferential direction around the central axis, the multi-linear edge structure is a V-shaped structure.

3. The inductive position sensor according to claim 2, characterized in that: The inflection point includes a connecting inflection point connecting two adjacent first periodic structures or connecting two adjacent second periodic structures, the first radial distance between the intermediate inflection point of each first periodic structure and the central axis is the same, the second radial distance between the intermediate inflection point of each second periodic structure and the central axis is the same, the first radial distance is equal to the second radial distance; the third radial distance between each connecting inflection point and the central axis is the same.

4. The inductive position sensor according to claim 3, characterized in that: It also includes a first excitation coil, which is arranged circumferentially around the central axis, the first radial distance is greater than the third radial distance, and the maximum outer diameter of the first excitation coil is less than the first radial distance.

5. The inductive position sensor according to claim 4, characterized in that: A fourth radial distance exists between a connection point between the end of the outbound coil and the beginning of the return coil and the central axis, and the fourth radial distance is greater than the third radial distance and less than the first radial distance.

6. The inductive position sensor according to claim 2, characterized in that: It also includes a rotor, which is arranged at intervals with the induction coil along the central axis. The rotor has a first conductive target area, and the first conductive target area has two side edges symmetrical about its own radial center line. The radial center line intersects with the central axis. The projections of the outbound coil and the return coil along the central axis have a plurality of intersections arranged at intervals along the circumferential direction, and there is an intermediate inflection point between two adjacent intersections. The first conductive target area is constructed so that when the projection of the radial center line on the central axis passes through the intermediate inflection point, the projections of the two side edges on the central axis respectively pass through two adjacent intersections symmetrical about the radial center line.

7. The inductive position sensor according to claim 1, characterized in that: The outward direction and the return direction are straight line directions, and the multi-straight line edge structure is an N-shaped structure.

8. The inductive position sensor according to claim 7, characterized in that: The outbound coil and the return coil are arranged symmetrically about a symmetry line parallel to the straight line direction, and the at least one intermediate inflection point includes an adjacent first inflection point and a second inflection point located in the outbound coil or the return coil, the first inflection point is located on one side of the symmetry line, and the second inflection point is located on the other side of the symmetry line.

9. The inductive position sensor according to claim 7, characterized in that: The inductive position sensor also includes a second excitation coil, which encloses a rectangular area, and the projection of the induction coil on a plane perpendicular to the rectangular area is located within the rectangular area or coincides with the second excitation coil; and / or, the inductive position sensor also includes a moving part adapted to the second excitation coil, and the moving part can move in a straight line along the extension direction of the symmetry line.

10. The inductive position sensor according to any one of claims 1 to 9, characterized in that: The inductive position sensor also includes a circuit board having a multi-layer board body, the induction coil is arranged on the circuit board, the inflection point includes a through hole penetrating at least one layer of the board body, and the induction coil penetrates the through hole so that the two wire body parts located on both sides of the inflection point are respectively located on opposite sides of the at least one layer of the board body.

Images