CN213985144U - Device for detecting rotation of metal object - Google Patents
Device for detecting rotation of metal object Download PDFInfo
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- CN213985144U CN213985144U CN202120016016.7U CN202120016016U CN213985144U CN 213985144 U CN213985144 U CN 213985144U CN 202120016016 U CN202120016016 U CN 202120016016U CN 213985144 U CN213985144 U CN 213985144U
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- 239000002184 metal Substances 0.000 title claims abstract description 56
- 230000006698 induction Effects 0.000 claims abstract description 66
- 238000001514 detection method Methods 0.000 claims description 12
- 229910052755 nonmetal Inorganic materials 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 7
- 230000010355 oscillation Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
A device for detecting the rotation of a metal object comprises a PCB coil, wherein the PCB coil comprises a main coil and a secondary coil; the secondary coil comprises a plurality of induction coils; each induction coil is distributed in at least two layers of the multilayer PCB, one layer of the multilayer PCB is provided with a main coil, and at least one induction coil is arranged in the main coil. The utility model can maximize the area of a single coil, thereby improving the intensity of the received signal and the signal-to-noise ratio to the maximum extent; meanwhile, the function of detecting the number of turns and the rotating direction of the metal object at a certain distance can be realized.
Description
Technical Field
The utility model relates to a metal object rotates and detects technical field, especially a be used for detecting metal object pivoted device.
Background
There are many methods for detecting the number of rotations and the direction of rotation of a metal object (such as a metal sheet) at a certain distance, and this application mainly compares the method using a PCB coil sampling, especially the coil layout method. At present, the following two methods are mainly adopted in the market: firstly, a method of a main coil winding and four secondary coil windings, such as a non-metal object rotating device and a detection system disclosed in CN 208736342U, adopts a PCB coil structure that is a mode of one main coil and four secondary coils; ② a method of one main coil winding and three secondary coil windings. In either way, a problem is solved, that is, both the number of rotations of the metal object and the direction of rotation of the metal object are detected.
Because the number of the secondary coils is smaller under the same area, the area occupied by a single coil is larger, the detection signal is stronger, the signal-to-noise ratio is higher, the induction distance is longer, and the anti-interference capability is stronger. However, the above methods are all used for detection in a limited unit area, so that more coils cannot be accommodated in the same spatial plane, and the signal-to-noise ratio is limited in a range because the manufacturing process of the PCB is limited, that is, the wire diameter and the spacing of the coils of the PCB cannot be made finer.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the above-mentioned not enough of prior art and providing a simple structure, received signal intensity and SNR are high are used for detecting metal object pivoted device.
The technical scheme of the utility model is that: a device for detecting the rotation of a metal object comprises a PCB coil, wherein the PCB coil comprises a main coil and a secondary coil; the secondary coil comprises a plurality of induction coils; each induction coil is distributed in at least two layers of the multilayer PCB, one layer of the multilayer PCB is provided with a main coil, and at least one induction coil is arranged in the main coil.
Furthermore, the number of the secondary coils on each layer of the PCB is 1-2.
Further, the PCB comprises at least two layers, each layer is provided with two associated induction coils, and the induction coils of the adjacent layers are arranged at an angle of 90 degrees.
Further, the secondary coil includes at least three induction coils.
Further, the secondary coil comprises 3-4 induction coils.
Further, the induction coil is arranged on the top layer or the middle layer of the PCB; signals are coupled between the induction coils of the adjacent layers through the via holes; or the induction coils of all the layers are independently arranged and are respectively connected with the control circuit.
Furthermore, each induction coil is arranged to form a balanced bridge circuit structure, the secondary coil receives the high-frequency electromagnetic wave sent by the main coil, and each induction coil is in a relatively balanced state under the condition that no metal object is interfered.
Further, the PCB coil is connected with a control circuit, and the control circuit comprises:
the induction coil detection circuit is used for acquiring the signal level sent by the secondary coil;
the microprocessor is used for processing and analyzing the signal level, and obtaining the position of the metal object by detecting the change of the level so as to detect the rotating direction and the number of turns of the metal object;
the pulse output circuit is connected with the output end of the microprocessor and used for outputting a pulse signal to the outside;
and the main coil driving circuit is connected with the output end of the microprocessor and is used for controlling the output driving signal of the main coil.
Furthermore, the PCB coil also comprises an amplifying and shaping circuit which is used for shaping and amplifying the high-frequency electromagnetic wave received by the induction coil into stable and balanced induction oscillating wave.
Further, the PCB coil and the metal object are arranged in a non-contact mode, the metal object is connected with the axis of the non-metal rotating object, and the vertical distance between the PCB coil and the metal object is 1-20 mm.
The utility model has the advantages that: by arranging each induction coil in at least two layers of the multilayer PCB, the area of a single coil can be maximized only by arranging 1-2 coils in the limited area of each layer, so that the intensity of a received signal and the signal-to-noise ratio are improved to the maximum extent; meanwhile, the function of detecting the number of turns and the rotating direction of the metal object at a certain distance can be realized.
Drawings
Fig. 1 is a schematic distribution diagram of a main coil and two induction coils on a top layer of a PCB according to an embodiment of the present invention;
fig. 2 is a schematic distribution diagram of two induction coils in a second layer in the middle of a PCB according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of the connection between the non-metal rotator and the metal object according to the present invention (wherein the metal object is a black portion).
Detailed Description
The invention will be described in further detail with reference to the drawings and specific examples.
As shown in fig. 1 and 2: a device for detecting the rotation of a metal object comprises a PCB coil, wherein the PCB coil comprises a main coil 1 and a secondary coil 2; the secondary coil 2 includes a plurality of induction coils 21; each induction coil 21 is distributed in at least two layers of the multilayer PCB3, one layer of the multilayer PCB3 is provided with a main coil 1, and at least one induction coil 21 is arranged in the main coil 1.
The scheme has the following advantages: when the conventional PCB coil is used for detecting the rotating direction and the number of turns of a metal object, the rotating direction and the number of turns of the metal object can be detected only by arranging 3-4 coils in a limited area at least, so that the area of a single coil in the limited area cannot be limited to be larger, and the signal detection sensitivity cannot be stronger; in the embodiment, each induction coil is arranged in at least two layers of the multilayer PCB, so that the area of a single coil can be maximized only by arranging 1-2 coils in the limited area of each layer, and the intensity and the signal-to-noise ratio of the received signal are improved to the maximum extent.
In this embodiment, the primary coil 1 and the secondary coil 2 may be disposed in any one of the layers of the PCB3, such as the top layer or the middle layer; signals can be coupled among the layers through the through holes so as to increase the number of turns of the coil and increase the signal strength. The number of the induction coils on each layer is 1-2, namely the induction coils on each layer can be associated pairwise and can be arranged independently.
The following is a preferred embodiment of the PCB coil arrangement of the present invention:
the multilayer PCB3 of this embodiment includes three layers, where the number of the induction coils 21 is four, the top layer is arranged with the main coil 1 and two induction coils 21, and the middle second layer is arranged with another two induction coils 21, so that only two induction coils need to be arranged in the limited area of each layer, and the area of a single coil can be maximized compared with 3-4 induction coils arranged on one layer; in order to solve the judgment of the rotation direction of the metal object, the induction coil of the middle second layer and the induction coil of the top layer are required to be arranged at 90 degrees, and the judgment of the rotation direction can be solved by the difference of 90 degrees.
Specifically, the primary coil 1 is used for emitting a pulse oscillation signal, and the secondary coil 2 is used for receiving the oscillation signal. The primary coil 1 on the top layer is arranged outside, the secondary coil 2 is arranged inside, the secondary coil 2 comprises two induction coils 21 arranged inside the primary coil, the shape of the induction coils 21 is preferably semicircular, and the two induction coils 21 are symmetrically arranged. The shape of the main coil 1 is preferably circular, so that the induction coils 21 are uniformly arranged, and the arrangement range is large. The two induction coils 21 are connected to the main coil with a floating common terminal. The two induction coils 21 of the middle second layer are also symmetrically arranged, are arranged at 90 degrees with the induction coils 21 of the top layer, and are in signal coupling with the induction coils 21 of the top layer through the via holes. The four induction coils 21 are arranged to form a balanced bridge circuit structure, so that under the condition of no interference of metal objects, each induction coil is in a relatively balanced state; when the induction coils are affected by the external metal object 4 in different degrees, the balance of the oscillation wave can be affected, so that different signal levels are output, the position of the metal object is sensed through the change of the detection level, and the rotating direction, the rotating position and the number of turns of the metal object 4 are detected.
In this embodiment, the PCB coil is connected to the control circuit, and the PCB coil and the control circuit may be disposed on the same PCB or may be independently disposed on different circuit boards. The control circuit of the embodiment comprises a Microprocessor (MCU), a power management circuit, a pulse output circuit, a main coil driving circuit and an induction coil detection circuit. The output end of the microprocessor is connected with the main coil through the main coil driving circuit, and each induction coil in the secondary coil is connected with the input end of the microprocessor through the induction coil detection circuit; the output end of the microprocessor is also connected with a pulse output circuit.
As shown in fig. 3: in this embodiment, the PCB coil and the metal object 4 are disposed in a non-contact manner, the metal object 4 is connected to the axis of the non-metal rotator 5, and the vertical distance between the PCB coil and the metal object 4 is 1-20 mm. The non-metal rotator 5 is preferably circular, the metal object 4 is a metal sheet, and the metal sheet is connected to the shaft of the non-metal rotator 5 in a semicircular shape.
The working principle of the embodiment is as follows: the main coil 1 is electrified with a high-frequency pulse electric signal, a trace high-frequency electromagnetic wave signal is induced from the secondary coil 2, a stable and balanced induction oscillation wave is formed after the signal is shaped and amplified by an amplifying and shaping circuit in the PCB coil, when the four induction coils 21 are influenced by external metal objects 4 in different degrees, the balance of the oscillation wave can be influenced, different signal levels are output, and the metal object position is sensed through the change of the detection level, so that the rotating direction, the rotating position and the number of turns of the metal object are detected. The detection distance of the metal object is related to the area of the metal object and is unrelated to the thickness, the induction distance is about 1-20 mm, and the metal object is not interfered by a magnetic field and is not influenced by temperature change. The power consumption dynamic adjustment of the power supply comprises a static mode and a dynamic mode, wherein the static mode reduces the sampling frequency and reduces the power consumption, and the dynamic mode increases the sampling frequency and improves the sampling precision.
It can be understood that the present invention mainly protects the distribution structure of the PCB coil, and the specific working principle, the circuit structure of the control circuit and the application field can be the same as the non-metal object rotating device and the detection system disclosed in CN 208736342U applied by the applicant before the filing date of the present application, and are not described herein again.
Claims (10)
1. A device for detecting the rotation of a metal object comprises a PCB coil, wherein the PCB coil comprises a main coil and a secondary coil; the secondary coil comprises a plurality of induction coils; the PCB is characterized in that each induction coil is distributed in at least two layers of the multilayer PCB, one layer of the multilayer PCB is provided with a main coil, and at least one induction coil is arranged in the main coil.
2. The apparatus for detecting the rotation of a metal object according to claim 1, wherein the number of the secondary coils per layer of the PCB is 1-2.
3. Device for detecting the rotation of a metal object according to claim 1 or 2, characterized in that said PCB comprises at least two layers, each layer being provided with two associated induction coils, the induction coils of adjacent layers being arranged at 90 ° between them.
4. The apparatus for detecting rotation of a metal object according to claim 1 or 2, wherein the secondary coil includes at least three induction coils.
5. The apparatus for detecting the rotation of a metal object according to claim 4, wherein the secondary coil comprises 3 to 4 induction coils.
6. The apparatus for detecting rotation of a metal object according to claim 1 or 2, wherein the induction coil is disposed on a top layer or a middle layer of the PCB; signals are coupled between the induction coils of the adjacent layers through the via holes; or the induction coils of all the layers are independently arranged and are respectively connected with the control circuit.
7. The apparatus according to claim 1 or 2, wherein the induction coils are arranged to form a balanced bridge circuit structure, the secondary coil receives the high frequency electromagnetic wave transmitted by the primary coil, and the induction coils are in a relatively balanced state without interference of the metal object.
8. The apparatus for detecting the rotation of a metal object according to claim 7, wherein the PCB coil is connected to a control circuit, the control circuit comprising:
the induction coil detection circuit is used for acquiring the signal level sent by the secondary coil;
the microprocessor is used for processing and analyzing the signal level, and obtaining the position of the metal object by detecting the change of the level so as to detect the rotating direction and the number of turns of the metal object;
the pulse output circuit is connected with the output end of the microprocessor and used for outputting a pulse signal to the outside;
and the main coil driving circuit is connected with the output end of the microprocessor and is used for controlling the output driving signal of the main coil.
9. The apparatus for detecting the rotation of a metal object according to claim 1 or 2, wherein the PCB coil further comprises an amplifying and shaping circuit for shaping and amplifying the high frequency electromagnetic wave received by the induction coil into a stable and balanced induced oscillating wave.
10. The device for detecting the rotation of the metal object as claimed in claim 1 or 2, wherein the PCB coil is arranged in a non-contact manner with the metal object, the metal object is connected with the axis of the non-metal rotating object, and the vertical distance between the PCB coil and the metal object is 1-20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120016016.7U CN213985144U (en) | 2021-01-06 | 2021-01-06 | Device for detecting rotation of metal object |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120016016.7U CN213985144U (en) | 2021-01-06 | 2021-01-06 | Device for detecting rotation of metal object |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213985144U true CN213985144U (en) | 2021-08-17 |
Family
ID=77250702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120016016.7U Active CN213985144U (en) | 2021-01-06 | 2021-01-06 | Device for detecting rotation of metal object |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213985144U (en) |
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2021
- 2021-01-06 CN CN202120016016.7U patent/CN213985144U/en active Active
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