Eddy current sensor

Abstract

The utility model discloses an eddy current sensor, which relates to the technical field of sensors and comprises an outer shell, a PCBA (printed circuit board assembly), an induction blade, a wire harness and a sheath, the PCBA is arranged in the outer shell, the induction blade is rotatably arranged on one side of the outer shell, the sheath is arranged at one end of the outer shell, and one end of the wire harness penetrates through the sheath and is connected with the PCBA; the sheath comprises a sheath main body, positioning columns, a connecting part and a convex block, one end of the sheath main body is provided with a plurality of positioning columns, the sheath main body is internally provided with a plurality of first flat cable holes, the positioning columns are communicated with the first flat cable holes, the other end of the sheath main body is provided with the connecting part, and the connecting part is provided with a plurality of second flat cable holes; the first flat cable holes are communicated with the second flat cable holes, and the two sides of the connecting part are provided with protruding blocks. According to the utility model, through the arrangement of the sheath structure, the arrangement and protection of the wire harness exposed outside can be realized, the phenomena of disorder, winding, abrasion and electric leakage of the wire harness are avoided, and the use safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sensor, especially to a kind of eddy current sensors. BACKGROUND

[0002] Motor angle detection technology is mainly resolver detection scheme, resolver (resolver / transformer) is an electromagnetic sensor, to measure the rotation of the shaft angle displacement and angular velocity, by stator and rotor. Wherein stator winding as the primary side of transformer, accept excitation voltage, excitation frequency is usually 400, 3000 and 5000HZ etc. Rotor winding as the secondary side of transformer, through electromagnetic coupling to get induced voltage.

[0003] As the prior art CN212988258U disclosed in a kind of eddy current motor angle sensor, including shell, is equipped with PCB board in shell, is equipped with chip on the PCB board, is equipped with the through-hole of motor shaft that can be inserted in shell, is equipped with two groups of secondary coil on PCB board, is equipped with primary coil outside secondary coil, secondary coil is arranged with motor shaft as center, chip is below primary coil, is equipped with induction wheel that is synchronous with motor shaft rotation outside shell, the induction wheel includes several blades, the diameter of induction wheel is not less than the diameter of primary coil.

[0004] However, the PCB board and shell in prior art are connected by pouring glue mode, this connection mode is not convenient for the disassembly replacement of PCB board, and wire harness is directly connected with PCB board, so that more wire harnesses are exposed, and the situation of disorderly winding of wire harness is prone to occur, and the exposed wire harness cannot be protected, and wear and tear and leakage are prone to occur. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of eddy current sensors, to solve the above technical problems.

[0006] The technical scheme adopted by the utility model is as follows:

[0007] A kind of eddy current sensor, including shell body, PCBA, sensing blade, wire harness and sheath, the PCBA is arranged in the shell body, the sensing blade is rotatably arranged on the side of the shell body, the sheath is arranged at one end of the shell body, one end of the wire harness passes through the sheath and is connected with the PCBA;

[0008] The sheath comprises a sheath body, positioning columns, a connecting part and protrusions, one end of the sheath body is provided with a plurality of positioning columns, the inside of the sheath body is provided with a plurality of first wire holes, the positioning columns are in communication with the first wire holes, the other end of the sheath body is provided with the connecting part, the connecting part is provided with a plurality of second wire holes, the first wire holes are in communication with the second wire holes, and the two sides of the connecting part are provided with the protrusions.

[0009] Preferably, the positioning columns are hollow, and the first wire holes, the second wire holes and the positioning columns are coaxially arranged.

[0010] Preferably, the inner diameter of the first wire holes is larger than the inner diameter of the positioning columns.

[0011] Preferably, the connecting part, the sheath body and the positioning columns are integrally formed.

[0012] Preferably, one end of the connecting part is provided with a raised edge, and a groove is formed between the raised edge and the surface of the other end of the sheath body.

[0013] Further preferably, one end of the connecting part is provided with two limiting sheets, and the second wire holes are located in the area surrounded by the two limiting sheets and the raised edge.

[0014] Preferably, the PCBA is provided with a processing circuit, an excitation coil and a receiving coil connected with the processing circuit, and the induction vane can rotate between the excitation coil and the receiving coil.

[0015] Preferably, the induction vane is made of conductive material.

[0016] Preferably, one end of the wire harness comprises a first part and a second part connected with each other, the first part is arranged in the positioning column and protrudes from the positioning column, and the second part is arranged in the first wire hole and the second wire hole.

[0017] Preferably, the outer shell comprises a base, a cover plate and a motor shaft sleeve, the motor shaft sleeve is arranged in the base, the cover plate is arranged on one side of the base, the PCBA is arranged in the base, the PCBA is provided with a through hole, the motor shaft sleeve is located in the through hole, a plurality of clamping blocks are arranged on the outer wall of the motor shaft sleeve, the clamping blocks abut against the surface of the PCBA, and the cover plate, the motor shaft sleeve and the induction vane are all provided with motor shaft holes.

[0018] The above technical scheme has the following advantages or beneficial effects:

[0019] (1) The utility model discloses a sheath structure can be realized to the exposed harness arrangement and protection, avoid the phenomenon that the harness appears disorder, winding and abrasion leakage, improve the security of use.

[0020] (2) The utility model discloses a motor shaft sleeve can be fixed to PCBA, convenient PCBA's installation, disassembly and replacement. DRAWINGS

[0021] Figure 1 It is the explosion schematic diagram of eddy current sensor in the utility model;

[0022] Figure 2 It is the structure schematic diagram of sheath in the utility model;

[0023] Figure 3 It is the principle diagram of excitation coil and receiving coil in the utility model;

[0024] Figure 4 It is the structure schematic diagram of induction vane in the utility model.

[0025] In the drawing: 1, PCBA;101, oscillation circuit;102, detection circuit;103, excitation coil;104, receiving coil;2, induction vane;3, harness;4, sheath;401, sheath main part;402, positioning column;403, connecting portion;404, lug;405, second wire hole;406, flange;407, limiting sheet;5, first part;6, second part;7, base;8, cover plate;9, motor shaft sleeve;10, clamping block;11, sleeve;12, mounting hole. DETAILED DESCRIPTION

[0026] The technical scheme of the utility model will be described below in conjunction with the drawings, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the scope of protection of the utility model.

[0027] In the description of the utility model, it is necessary to explain that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. appear, the indicated orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, construct and operate with a particular orientation, therefore can not be understood as the limitation of the utility model. In addition, if the terms "first", "second", "third" appear, only for the description purpose, and can not be understood as indicating or implying relative importance.

[0028] In the description of the utility model, it is to explain, unless there is definite and limited, if the term "installation", "link", "connection" should be broad understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, can also be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication。For ordinary skilled in the art, the above-mentioned terms can be understood in the utility model in the concrete meaning of the specific circumstances.

[0029] Figure 1 It is the explosion schematic view of the eddy current sensor in the utility model; Figure 2 It is the structure schematic view of the sheath in the utility model; Figure 3 It is the principle diagram of the excitation coil and the receiving coil in the utility model;

[0030] Figure 4 It is the structure schematic view of the induction vane in the utility model, please see Figures 1 to 4 Indicated, show a preferred embodiment, show an eddy current sensor, including shell body, PCBA1, induction vane 2, wire harness 3 and sheath 4, PCBA1 is provided in the shell body, the shell body's one side rotatably is provided with induction vane 2, and the shell body's one end is provided with sheath 4, and one end of wire harness 3 passes through sheath 4 and is connected with PCBA1;In the embodiment, induction vane 2 is arranged below the shell body, can be driven under the motor shaft of motor and rotate, and the motor shaft passes through PCBA1, and PCBA1 can detect the rotating speed of motor shaft.

[0031] The sheath 4 comprises a sheath body 401, positioning columns 402, a connecting portion 403 and protrusions 404. The sheath body 401 is provided with the positioning columns 402 at one end, and is internally provided with a plurality of first wire holes. The positioning columns 402 are in communication with the first wire holes. The sheath body 401 is provided with the connecting portion 403 at the other end. The connecting portion 403 is provided with a plurality of second wire holes 405. The first wire holes are in communication with the second wire holes 405. The connecting portion 403 is provided with the protrusions 404 at both sides. In the embodiment, the sheath body 401 and the outer shell can be connected by gluing or welding. The one end of the wire harness 3 is connected to the PCBA 1 by soldering. The outer shell is provided with a plurality of positioning holes for cooperation with the positioning columns 402. The positioning columns 402 can be inserted into the positioning holes, so that the one end of the wire harness 3 can be inserted into the outer shell. The part of the one end of the wire harness 3 exposed outside is arranged in the second wire hole 405, the first wire hole and the positioning column 402, so as to protect the wire harness 3 and avoid the exposed wire harness 3 from being disordered, winding, abraded and electrically leaked. The remaining part of the wire harness 3 is collected together by the sleeve 11. For details, refer to Figure 1 The protrusions 404 are arranged on the connecting portion 403, so as to facilitate holding the sheath 4.

[0032] Further, as a preferred embodiment, the positioning column 402 is hollow. The first wire hole and the second wire hole 405 are coaxially arranged with the positioning column 402, so as to facilitate the wire arrangement.

[0033] Further, as a preferred embodiment, the inner diameter of the first wire hole is larger than the inner diameter of the positioning column 402. The one end of the wire harness 3 comprises a first part 5 and a second part 6 connected to each other. The first part 5 is arranged in the positioning column 402 and extends out of the positioning column 402, and is used for connecting the PCBA 1. The second part 6 is arranged in the first wire hole and the second wire hole 405. The outer diameter of the first part 5 is smaller than the outer diameter of the second part 6. The inner diameter of the first wire hole is larger than the inner diameter of the positioning column 402, so that a limiting surface is formed between the first part 5 and the second part 6, and the second part 6 of the wire harness 3 is prevented from entering the positioning column 402.

[0034] Further, as a preferred embodiment, the connecting portion 403, the sheath body 401 and the positioning column 402 are integrally formed, so as to improve the stability of the structure of the sheath 4. In other embodiments, the connecting portion 403, the sheath body 401 and the positioning column 402 can be connected by gluing or through a buckle form.

[0035] Further, as a preferred embodiment, the connecting portion 403 is provided with a raised edge 406 at one end. The raised edge 406 and the surface of the other end of the sheath body 401 form a groove, so as to facilitate holding the sheath 4.

[0036] Further, as a preferred embodiment, one end of the connecting portion 403 is provided with two limiting sheets 407, and the second wire hole 405 is located in the area surrounded by the two limiting sheets 407 and the convex edge 406. Referring to Figure 2 As shown, the convex edge 406 also extends upward from the connecting portion 403, and through the arrangement of the limiting sheet 407 and the convex edge 406, the second wire hole 405 can be shielded in the lateral direction.

[0037] Further, as a preferred embodiment, the PCBA1 has a processing circuit, an excitation coil 103 and a receiving coil 104 connected to the processing circuit, and the sensing vane 2 can rotate between the excitation coil 103 and the receiving coil 104. Among them, the receiving coil 104 and the excitation coil 103 are printed on the PCBA1 in the form of copper traces, the sensing vane 2 is located between the excitation coil 103 and the receiving coil 104 in the spatial position, and the excitation coil 103 generates a uniform alternating electromagnetic field (or a radially symmetric alternating magnetic field) by a stable oscillation circuit 101. The sensing vane 2 (rotor) in this embodiment is made of conductive material, which can be any kind of metal, such as aluminum, steel or PCB with printed copper layer. In use, the sensing vane 2 generates eddy current in the alternating magnetic field of the excitation coil 103, which always hinders the excitation coil 103 from penetrating the sensing vane 2, and in the part covered by the sensing vane 2, the magnetic force line perpendicular to the plane of the sensing vane 2 is weakened, the magnetic field amplitude of the part covered by the sensing vane 2 is smaller than that of the part not covered by the sensing vane 2, a step in amplitude occurs, resulting in inconsistent magnetic flux of the opposite coils of the receiving coil 104, so that the induced electromotive force cannot be offset, and the sensing vane 2 position is sensed by the receiving coil 104. Among them, the processing circuit includes an oscillation circuit 101 and a detection circuit 102, the excitation coil 103 is connected to the oscillation circuit 101, and the receiving coil 104 is connected to the detection circuit 102.

[0038] Further, as a preferred embodiment, the outer shell includes a base 7, a cover plate 8, and a motor shaft sleeve 9, the motor shaft sleeve 9 is arranged in the base 7, the base 7 is provided with the cover plate 8 on one side, the PCBA1 is arranged in the base 7, the PCBA1 is provided with a perforation, the motor shaft sleeve 9 is located in the perforation, a plurality of clamping blocks 10 are arranged on the outer wall of the motor shaft sleeve 9, the clamping blocks 10 abut against the surface of the PCBA1, and the cover plate 8, the motor shaft sleeve 9 and the sensing vane 2 are all provided with motor shaft holes. In this embodiment, the motor shaft sleeve 9 is fixed in the base 7, and the specific arrangement is shown in Figure 1As shown, the clamping block 10 is arranged on the outer wall of the induction vane 2 for fixing the PCBA 1, the cover plate 8 and the base 7 can be connected by gluing, clamping or through screw connection, the cover plate 8 abuts against the PCBA 1 for pressing the PCBA 1 to avoid the shaking or loosening of the PCBA 1 in the base 7, the motor shaft sleeve 9, the PCBA 1 and the induction vane 2 are arranged on the motor shaft for detecting the rotating speed of the motor shaft.

[0039] Three mounting holes 12 are arranged on the periphery of the base 7 for mounting bolts to facilitate the connection of the eddy current sensor with external structural members.

[0040] In use, the bolts are mounted in the mounting holes 12 on the base 7, the eddy current sensor is mounted at the designated position through the bolts, then the motor shaft passes through the cover plate 8, the PCBA 1, the motor shaft sleeve 9 and the induction vane 2 and can drive the induction vane 2 to rotate, when the induction vane 2 rotates, the eddy current is generated in the alternating magnetic field of the exciting coil 103, the position of the induction vane 2 is detected to determine the position and angle of the motor shaft, and through the arrangement of the plurality of vanes on the induction vane 2, the continuous position feedback can be provided to help the whole system to realize the closed loop control, which is helpful for real-time adjustment of the driving signal to ensure that the motor operates at the preset speed.

[0041] The above only describes the preferred embodiments of the present application, and does not limit the embodiments and protection scope of the present application, and those skilled in the art should realize that any equivalent replacement and obvious changes made according to the content of the present application should be included in the protection scope of the present application.

Claims

1. An eddy current sensor, characterized by, The shell body is internally provided with the PCBA, one side of the shell body is rotatably provided with the induction vane, one end of the shell body is provided with the sheath, and one end of the wire harness passes through the sheath and is connected with the PCBA; The sheath comprises a sheath body, positioning columns, a connecting portion and protrusions, one end of the sheath body is provided with a plurality of the positioning columns, the inside of the sheath body is provided with a plurality of first wire holes, the positioning columns are in communication with the first wire holes, the other end of the sheath body is provided with the connecting portion, the connecting portion is provided with a plurality of second wire holes, the first wire holes are in communication with the second wire holes, and the two sides of the connecting portion are provided with the protrusions.

2. The eddy current sensor of claim 1, wherein, The positioning columns are hollow, and the first wire holes, the second wire holes and the positioning columns are coaxially arranged.

3. The eddy current sensor of claim 1, wherein, The inner diameter of the first wire hole is greater than the inner diameter of the positioning column.

4. The eddy current sensor of claim 1, wherein, The connecting portion, the sheath body and the positioning columns are integrally formed.

5. The eddy current sensor of claim 1, wherein, One end of the connecting portion is provided with a raised edge, and a groove is formed between the raised edge and the surface of the other end of the sheath body.

6. The eddy current sensor of claim 5, wherein, One end of the connecting portion is provided with two limiting sheets, and the second wire hole is located in the area surrounded by the two limiting sheets and the raised edge.

7. The eddy current sensor of claim 1, wherein, The PCBA is provided with a processing circuit, an excitation coil and a receiving coil connected with the processing circuit, and the induction vane can rotate between the excitation coil and the receiving coil.

8. The eddy current sensor of claim 1, wherein, The induction vane is made of conductive material.

9. The eddy current sensor of claim 1, wherein, One end of the wire harness comprises a first part and a second part connected with each other, the first part is arranged in the positioning column and protrudes from the positioning column, and the second part is arranged in the first wire hole and the second wire hole.

10. The eddy current sensor of claim 1, wherein, The shell body comprises a base, a cover plate and a motor shaft sleeve, the motor shaft sleeve is arranged in the base, one side of the base is provided with the cover plate, the PCBA is arranged in the base, the PCBA is provided with a perforation, the motor shaft sleeve is located in the perforation, a plurality of clamping blocks are arranged on the outer wall of the motor shaft sleeve, the clamping blocks abut against the surface of the PCBA, and the cover plate, the motor shaft sleeve and the induction vane are all provided with motor shaft holes.

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