CN210427614U - SMD miniature magnetic current body speed sensor - Google Patents
SMD miniature magnetic current body speed sensor Download PDFInfo
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- CN210427614U CN210427614U CN201920783930.7U CN201920783930U CN210427614U CN 210427614 U CN210427614 U CN 210427614U CN 201920783930 U CN201920783930 U CN 201920783930U CN 210427614 U CN210427614 U CN 210427614U
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Abstract
The utility model discloses a patch type micro magnetofluid revolution speed sensor, which comprises a sensor base, a sensor cavity arranged inside the sensor base, a revolution speed induction ring sleeved in the sensor cavity, and a speed measuring shaft arranged in the middle of the revolution speed induction ring; the sensor comprises a sensor cavity and a speed measuring shaft, wherein the bottom of the sensor cavity is provided with a first conductive coating used as a current signal input end, a rotating speed induction ring is a split ring, a second conductive coating used as a current signal output end is arranged in the rotating speed induction ring, a magnetofluid solution is filled in the sensor cavity, and the speed measuring shaft is provided with a magnetic body patch used for controlling nonmagnetic conductive particles in the magnetofluid solution to perform self-assembly. The utility model discloses speed sensor has simple structure, and the processing cost is lower, and the magnetic current body has good sealed, heat dissipation and lubricating property again simultaneously, can be applied to dust, extreme environment such as under water, has greatly improved speed sensor's response speed, stability, reliability and economic nature.
Description
Technical Field
The utility model relates to a speed sensor field especially relates to a miniature magnetic current body speed sensor of SMD.
Background
The rotation speed sensor is a sensor for converting the rotation speed of a rotating object into electric quantity to be output, belongs to an indirect measuring device, and can be manufactured by methods such as mechanical processing, electromagnetic processing, mixed processing and the like. The rotation speed sensor can be divided into an analog type and a digital type according to different signal forms, and the rotation speed sensor has a wide variety and extremely wide application. Common rotation speed sensors include photoelectric type, capacitance type, variable reluctance type, tachogenerator and the like.
In the prior art, the rotation speed is measured mainly by directly transmitting the rotation state, but the form causes a certain amount of load and resistance to a speed measuring shaft by a speed measuring sensor, and the phenomenon is particularly obvious in a micro electromechanical system. In addition, the bearing bush of the internal sensor is easy to generate heat when continuously rubbed in an electrified state, and even can generate electric sparks after being worn, so that the performance of the electric connector is seriously influenced, and dangerous accidents are caused. In addition, most of the existing miniature revolution speed sensors need to use precise micro-processing to manufacture the core components of the sensor, firstly, the sensor needs a complex microstructure in design, and secondly, the processing cost required by the special structure is usually very high, so that the cost of the whole revolution speed sensor is increased suddenly.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned prior art not enough, an object of the utility model is to provide a miniature magnetic fluid revolution speed sensor of SMD, it is complicated to aim at solving current revolution speed sensor structure, and response speed is slow, and reliability, stability are relatively poor and manufacturing cost are higher problem.
The technical scheme of the utility model as follows:
a patch type micro magnetofluid rotation speed sensor comprises a sensor base, a sensor cavity arranged in the sensor base, a rotation speed induction ring sleeved in the sensor cavity, and a speed measurement shaft arranged in the middle of the rotation speed induction ring; the sensor comprises a sensor cavity and a speed measuring shaft, and is characterized in that a first conductive coating used as a current signal input end is arranged at the bottom of the sensor cavity, a rotating speed induction ring is a split ring, a second conductive coating used as a current signal output end is arranged in the rotating speed induction ring, a magnetic fluid solution is filled in the sensor cavity and comprises non-magnetic conductive particles and an insulating magnetic fluid, and a magnetic body patch used for controlling the self-assembly of the non-magnetic conductive particles in the magnetic fluid is arranged on the speed measuring shaft.
The patch type micro magnetofluid speed sensor is characterized in that an end cover for preventing magnetofluid solution from leaking is arranged on the side face of the sensor base.
The size of an annular gap formed between the first conductive coating and the rotating speed induction ring is 100-500 microns.
The patch type micro magnetofluid speed sensor is characterized in that the non-magnetic particle conductive particles are one or more selected from nano copper powder, nano aluminum powder, nano silver wires and carbon nano tubes.
The patch type micro magnetic fluid rotation speed sensor is characterized in that at least two magnetic body patches are uniformly arranged on one circumference of the speed measuring shaft, and the distance between every two adjacent magnetic body patches is smaller than the opening width of the rotation speed induction ring.
The patch type micro magnetofluid speed sensor is characterized in that the end cover is provided with an installation groove for installing a permanent magnet.
The patch type micro magnetofluid speed sensor is characterized in that the end cover is uniformly provided with a plurality of mounting holes, and the side surface of the sensor base is provided with positioning holes matched with the mounting holes. .
Has the advantages that: the utility model provides a miniature magnetic current body revolution speed sensor of SMD controls the developments self-assembly process in to the magnetic current body solution through the direction of rotation in magnetic substance paster magnetic field to circuit break-make between first conductive coating of control and the rotational speed response ring realizes the measurement to test shaft rotational speed. Compared with the prior art, the utility model discloses compact structure, response time is shorter, more traditional miniature revolution speed sensor of pure mechanical structure formula, the utility model discloses miniature magnetic current body revolution speed sensor of SMD has simple structure, and the processing cost is lower, and the magnetic current body has good sealed, heat dissipation and lubricating property again simultaneously, can be applied to dust, the extreme environment such as under water, has greatly improved miniature revolution speed sensor's response speed, stability, reliability and economic nature.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of a patch type micro magnetofluid speed sensor of the present invention.
Fig. 2 is a schematic structural diagram of a preferred embodiment of the rotating speed induction ring of the present invention.
Fig. 3 is a side cross-sectional view of the patch type micro-magnetic fluid speed sensor shown in fig. 1 according to the present invention.
Fig. 4 is an enlarged schematic view of a portion B shown in fig. 3 according to the present invention.
Fig. 5 is a flowchart of a preferred embodiment of a method for manufacturing a patch type micro-magnetic fluid speed sensor.
Detailed Description
The utility model provides a miniature magnetic current body speed sensor of SMD, for making the utility model discloses a purpose, technical scheme and effect are clearer, more clear and definite, it is following right the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4, the patch type micro magnetic fluid speed sensor provided by the present invention includes a sensor base 10, a sensor cavity 20 disposed inside the sensor base 10, a speed sensing ring 30 sleeved in the sensor cavity 20, and a speed measuring shaft 40 disposed in the middle of the speed sensing ring 30; the sensor comprises a sensor cavity and a speed measuring shaft 40, and is characterized in that a first conductive coating (not marked) used as a current signal input end is arranged at the bottom of the sensor cavity, a rotating speed induction ring 30 is a split ring, a second conductive coating 31 used as a current signal output end is arranged in the rotating speed induction ring 30, a magnetofluid solution (not marked) is filled in the sensor cavity 20, the magnetofluid solution comprises nonmagnetic conductive particles and an insulating magnetic fluid, and a magnetic body patch 50 used for controlling the nonmagnetic conductive particles in the magnetofluid solution to perform self-assembly is arranged on the speed measuring shaft 40.
In the utility model, the sensor base is mainly used as the external fixing part and the supporting part of the rotating speed sensor, the magnetic body patch is mainly used for controlling the self-assembly of the non-magnetic conductive particles in the magnetic fluid solution in the sensor cavity, the first conductive coating coated on the bottom of the sensor cavity is used as the source of signal transmission, the rotating speed induction ring is the core structure of the patch type micro magnetic fluid rotating speed sensor, the rotating speed induction ring is of a split ring structure, and the second conductive coating used as the current signal output end is arranged in the rotating speed induction ring, the dynamic self-assembly process in the magnetic fluid solution is controlled through the rotating direction of the magnetic body patch magnetic field, thereby controlling the circuit on-off between the first conductive coating and the rotating speed induction ring, and realizing the recording of the number of turns of the rotating speed measuring shaft through the current on-off times between the first conductive coating, and completing the measurement of the rotating speed of the test shaft. The utility model provides a miniature magnetic current body speed sensor of SMD compact structure, response time is shorter, and more traditional miniature speed sensor of pure mechanical structure formula, the utility model discloses miniature magnetic current body speed sensor of SMD has simple structure, and the processing cost is lower, and the magnetic current body has good sealed, heat dissipation and lubricating property again simultaneously, can be applied to dust, the extreme environment such as under water, has greatly improved miniature speed sensor's response speed, stability, reliability and economic nature.
In some embodiments, the magnetic fluid solution comprises non-magnetic conductive particles and an insulating magnetic fluid. Specifically, the magnetic fluid solution is prepared by mixing a certain amount of micro-scale or nano-scale non-magnetic conductive particles into an insulating magnetic fluid and keeping the uniform mixing state of the particles by a holding agent (such as styrene or phosphate buffer). The non-magnetic conductive particles in the magnetic fluid solution can be self-assembled along the direction of the magnetic induction line under the action of a certain magnetic field to form a chain structure, the chain structure can realize the communication effect between two circuits, and therefore the circuit can be closed and opened by changing the state of the insulating magnetic fluid through controlling the magnetic field. Preferably, the non-magnetic conductive particles are selected from one or more of nano-scale copper powder, nano-scale aluminum powder, nano-scale silver wire and carbon nanotube, but not limited thereto.
In some embodiments, as shown in fig. 1, the sensor base 10 is provided with an end cap 60 at the side for preventing the leakage of the magnetofluid solution. Preferably, the end cover 60 is provided with an installation groove 61 for installing a permanent magnet, and the permanent magnet is used for preventing the magnetic fluid solution in the sensor cavity from leaking at the connection part of the end cover and the sensor base. More preferably, the end cover and the side surface of the sensor base are provided with adaptive mounting holes, and the end cover can be fixed on the sensor base by passing screws through the mounting holes. The permanent magnet mainly utilizes the characteristic that the magnetic viscosity of the magnetic fluid is increased under the action of a magnetic field, the magnetic field intensity of the permanent magnet is more than 0.1T (Tesla) for a water-based magnetic fluid, the magnetic field intensity of the permanent magnet is more than 0.08T (Tesla) for an oil-based magnetic fluid, and the commonly used permanent magnet comprises a neodymium iron boron permanent magnet or a ferrite permanent magnet.
In some embodiments, in order to avoid affecting the magnetic field distribution of the magnetic patch on the speed measuring shaft, the sensor base is made of a non-magnetic material, and a magnetic material cannot be used.
In some embodiments, as shown in fig. 1, the tachometer shaft is made of a non-magnetic material or coated with a lead layer, when the tachometer shaft has a large diameter and is non-magnetic, a magnetic patch is directly attached to the tachometer shaft for testing, when the tachometer shaft has weak magnetism and a small or thick shaft diameter, a coupling is required to be connected to the tachometer shaft, and then the magnetic patch is attached to the coupling.
In some embodiments, the bottom of the sensor cavity is provided with a first conductive coating, so that the uncharged sensor cavity bottom has certain conductivity, and the first conductive coating is connected with an input test current. Preferably, the size of an annular gap formed between the first conductive coating and the rotating speed induction ring is 100-500 micrometers, and the specific size design needs to be determined according to the specific rotating speed to be measured, wherein the gap requirement is smaller when the rotating speed is higher, and the gap requirement is reduced when the rotating speed is lower.
In some embodiments, as shown in fig. 2, the rotation speed sensing ring is a geometrically split ring, the split position of the rotation speed sensing ring is mainly used for storing the magnetic fluid solution, during the installation process, the split position needs to be kept upward, so that the sensor cavity can be filled with the magnetic fluid solution all the time, and meanwhile, a second conductive coating is arranged inside the rotation speed sensing ring and connected to the output end of the test current.
The utility model also provides a preparation method of miniature magnetic current body revolution speed sensor of SMD, wherein, as shown in fig. 5, including the step:
s10, selecting insulating magnetofluids of different base fluids according to the physicochemical properties of the non-magnetic micro-nano conductive particles for suspension dissolution to prepare a magnetofluid solution;
s20, designing a speed measuring shaft and magnetic patches according to the conditions of a speed measuring input end and the requirement of rotating speed measurement, wherein the width of a magnetic body in each magnetic patch is set to be W, and a plurality of magnetic patches are symmetrically arranged on the same circumference of the speed measuring shaft according to the precision requirement of rotating speed measurement;
s30, designing a rotating speed induction ring according to the width of the magnetic bodies in the magnetic body patches and the space between two adjacent magnetic body patches, wherein the opening width of the rotating speed induction ring is larger than the space between two adjacent magnetic body patches;
s40, designing a sensor base according to the opening position and the diameter of the rotating speed induction ring, spraying a first conductive coating at the bottom of a sensor cavity, installing the rotating speed induction ring, and checking the coaxiality of the sensor base and the rotating speed induction ring and the gap of the sensor cavity;
s50, designing an end cover according to the size of the sensor base, arranging an installation groove for installing a sealed permanent magnet on the end cover, installing the permanent magnet, filling the prepared magnetic fluid solution into the sensor cavity and testing the anti-leakage characteristic of the sensor cavity;
and S60, attaching the magnetic patch to the test shaft, placing the test shaft at a test position, and manufacturing the patch type micro magnetofluid speed sensor after assembly.
In some embodiments, in the present embodiment, according to the physicochemical properties of the non-magnetic micro-nano conductive particles, insulating magnetic fluids of different base fluids are selected for suspension dissolution, since the insulating ferromagnetic fluid has good heat dissipation, a temperature-sensitive insulating ferromagnetic fluid is generally used, the temperature-sensitive insulating magnetic fluid commonly used includes magnetic fluids such as water-based, oil-based, ester-based, and fluoroether oil, and when selecting, magnetic fluids of different magnetization strengths are selected by comprehensively considering the viscosity, pressure, and economy of the experimental fluid, and the higher the magnetization strength is, the more obvious the solid characteristics of the magnetic fluid are, and the self-assembly efficiency is also greatly improved; the base liquid can be prepared by selecting solvents such as water, engine oil, hydroxyl oil and the like, experimental measurement is needed after preparation, and the self-assembly efficiency of assembling the chain with the length of L under the designed magnetic field strength reaches 70 percent.
In some embodiments, when at least two magnetic patches are symmetrically arranged on the same circumference of the speed measuring shaft according to the accuracy requirement of the rotation speed measurement, in order to ensure that the induced current in the magnetic fluid rotation speed sensor can be disconnected and reconnected at the opening position during the rotation of the speed measuring shaft, the opening width of the rotation speed induction ring needs to be set to be larger than the distance between two adjacent magnetic patches. When N magnetic substance paster have been arranged to same circumference on the axle that tests the speed, just explain the axle that tests the speed and rotated the round when tachometric sensor output N signal.
In some embodiments, the width of the sensor cavity should be determined by the self-assembly experiment in step S10, and the rotation factor should also be considered, so the width d of the sensor cavity should be smaller than the length L of the self-assembly chain structure of the magnetofluid solution. Preferably, the value range commonly used is L/4< d < L.
In some embodiments, a mounting groove for mounting the permanent magnet is arranged on the end cover, and a gap of 0.02 to 0.2 mm needs to be left between the permanent magnet and the sealing surface during mounting of the permanent magnet.
In some embodiments, the speed measuring shaft enables the magnetic patch to be located at a mounting position corresponding to the opening position of the rotating speed induction ring during mounting.
To sum up, the utility model provides a miniature magnetic current body speed sensor of SMD controls the developments self-assembly process in to the magnetic current body solution through the direction of rotation in magnetic substance paster magnetic field to control the circuit break-make between first conductive coating and the rotational speed response ring, realize the measurement to test shaft rotational speed. Compared with the prior art, the utility model discloses compact structure, response time is shorter, more traditional miniature revolution speed sensor of pure mechanical structure formula, the utility model discloses miniature magnetic current body revolution speed sensor of SMD has simple structure, and the processing cost is lower, and the magnetic current body has good sealed, heat dissipation and lubricating property again simultaneously, can be applied to dust, the extreme environment such as under water, has greatly improved miniature revolution speed sensor's response speed, stability, reliability and economic nature.
It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. A patch type micro magnetofluid speed sensor is characterized by comprising a sensor base, a sensor cavity arranged in the sensor base, a speed sensing ring sleeved in the sensor cavity, and a speed measuring shaft arranged in the middle of the speed sensing ring; the sensor comprises a sensor cavity and a speed measuring shaft, and is characterized in that a first conductive coating used as a current signal input end is arranged at the bottom of the sensor cavity, a rotating speed induction ring is a split ring, a second conductive coating used as a current signal output end is arranged in the rotating speed induction ring, a magnetic fluid solution is filled in the sensor cavity and comprises non-magnetic conductive particles and an insulating magnetic fluid, and a magnetic body patch used for controlling the self-assembly of the non-magnetic conductive particles in the magnetic fluid solution is arranged on the speed measuring shaft.
2. The patch type micro magnetofluid speed sensor according to claim 1, wherein an end cap for preventing leakage of magnetofluid solution is disposed on a side surface of the sensor base.
3. The patch type micro magnetic fluid speed sensor according to claim 1, wherein the size of the annular gap formed between the first conductive coating and the speed sensing ring is 100-500 μm.
4. The patch type micro magnetofluid speed sensor according to claim 1, wherein the non-magnetic conductive particles are selected from one or more of nano copper powder, nano aluminum powder, nano silver wire and carbon nanotube.
5. The SMD micro magnetic fluid rotation speed sensor according to claim 1, wherein at least two magnetic patches are uniformly arranged on a circumference of the speed measuring shaft, and the distance between two adjacent magnetic patches is smaller than the opening width of the rotation speed sensing ring.
6. The patch type micro magnetofluid speed sensor according to claim 2, wherein the end cap is provided with an installation groove for installing the permanent magnet.
7. The patch type micro magnetofluid speed sensor according to claim 2, wherein the end cap is uniformly provided with a plurality of mounting holes, and the side surface of the sensor base is provided with positioning holes matched with the mounting holes.
8. The patch type micro magnetic fluid speed sensor according to claim 1, wherein the magnetic fluid solution further comprises a retention agent.
9. The patch type micro magnetic fluid speed sensor according to claim 8, wherein the retaining agent is styrene or phosphate buffer.
10. The patch type micro magnetic fluid speed sensor according to claim 1, wherein the sensor base material is a non-magnetic material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920783930.7U CN210427614U (en) | 2019-05-28 | 2019-05-28 | SMD miniature magnetic current body speed sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920783930.7U CN210427614U (en) | 2019-05-28 | 2019-05-28 | SMD miniature magnetic current body speed sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244074A (en) * | 2019-05-28 | 2019-09-17 | 南方科技大学 | A kind of miniature magnetic fluid speed probe of patch type and preparation method thereof |
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2019
- 2019-05-28 CN CN201920783930.7U patent/CN210427614U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244074A (en) * | 2019-05-28 | 2019-09-17 | 南方科技大学 | A kind of miniature magnetic fluid speed probe of patch type and preparation method thereof |
| CN110244074B (en) * | 2019-05-28 | 2024-04-02 | 南方科技大学 | Patch type micro magnetic fluid rotating speed sensor and preparation method thereof |
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