CN204203260U - A kind of speed probe based on giant magnetoresistance effect - Google Patents
A kind of speed probe based on giant magnetoresistance effect Download PDFInfo
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- CN204203260U CN204203260U CN201420738143.8U CN201420738143U CN204203260U CN 204203260 U CN204203260 U CN 204203260U CN 201420738143 U CN201420738143 U CN 201420738143U CN 204203260 U CN204203260 U CN 204203260U
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- magnetoresistance effect
- giant magnetoresistance
- resistance
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Abstract
The utility model discloses a kind of speed probe based on giant magnetoresistance effect, comprise giant magnetoresistance effect sensing head, signal generator module circuit, detecting circuit, shaping circuit and magnet, the input end of described signal generator module circuit connects direct supply, the output terminal of described signal generator module circuit is connected with the input end of giant magnetoresistance effect sensing head and detecting circuit respectively, the output terminal of described detecting circuit is connected with the input end of shaping circuit, described magnet is arranged on rotating disk, compared with prior art, the utility model can Poul Dorset Sheep, stable output signal, highly sensitive, structure is simple, good reliability, life-span is long.
Description
[technical field]
The utility model relates to the technical field of magneto-dependent sensor, particularly a kind of technical field of the speed probe based on giant magnetoresistance effect.
[background technology]
Magneto-dependent sensor has very important status in the field such as productive life and scientific research.Realized the measurement of things by magnetic, be conducive to realizing contactless measurement, and loss that need not be extra.Designed magneto-dependent sensor can be used for the whether close of measuring-signal, thus can derive measurement rotating speed, displacement, speed, magnetic field etc.
Have multiple to the sensor of tachometric survey, roughly can be divided into mechanical speed sensor, magnetoelectric tachometric transducer, hall-effect speed sensor, photosensitive type speed probe etc. according to principle.
Notification number is that to disclose a kind of speed probe based on tongue tube be exactly a kind of mechanical speed sensor to the Chinese utility model patent of 201220201842.X.Its ultimate principle is: when the magnet in rotating shaft is at every turn close to tongue tube, and in tongue tube, two tongues just can contact, so just can turning circuit, thus produces pulse output signals.It is little that this speed probe has volume, low cost and other advantages.But also there is drawback, as contacted the existence just having mechanical loss at every turn, owing to being mechanical motion therefore having the shortcoming that response frequency can not be very high.
Magnetoelectric tachometric transducer is that ultimate principle is to realize tachometric survey with magneto-electric induction.Namely the gear cutting magnetic line rotated, causes magnetic resistance change rate, thus induced electromotive force.This speed probe volume is little, easy to use.But be not suitable for low speed and measurement at a high speed, and operating distance is only and is less than 2mm.
Hall revolution speed transducer uses a kind of rotating speed measuring sensor comparatively widely at present, and compact, can survey the speed of various scope.But because sensitivity is relatively low, this just requires that in-plant measurement and subsequent conditioning circuit need carry out amplification process.Install and too closely can easily collide, cause reliability to reduce.
The speed probe of photo-electric makes based on photodiode, has the advantages such as high reliability, high precision, high resolving power.But the structure complex structure of photoelectric coded disk, and be subject to dust, the impact of the environment such as greasy dirt.
Therefore, a kind of highly sensitive, operating distance sensor that is large and that can work under some rugged surroundings is is urgently researched and developed.
[utility model content]
The purpose of this utility model solves the problems of the prior art exactly, propose a kind of Poul Dorset Sheep, stable output signal, highly sensitive, structure simple, can work in the presence of a harsh environment and good reliability, the speed probe based on giant magnetoresistance effect that the life-span is long.
For achieving the above object, the utility model proposes a kind of speed probe based on giant magnetoresistance effect, comprise giant magnetoresistance effect sensing head, signal generator module circuit, detecting circuit, shaping circuit and magnet, the input end of described signal generator module circuit connects direct supply, the output terminal of described signal generator module circuit is connected with the input end of giant magnetoresistance effect sensing head and detecting circuit respectively, the output terminal of described detecting circuit is connected with the input end of shaping circuit, and described magnet is arranged on rotating disk.
As preferably, described signal generator module circuit comprises integrated chip and the first resistance, the pin VCC of described integrated chip connects direct supply, the pin GND ground connection of described integrated chip, the pin P3.3 of described integrated chip is connected with the first resistance input end, the output terminal of described first resistance is connected with the input end of giant magnetoresistance effect sensing head and detecting circuit respectively, and described integrated chip is the integrated chip of 8pin.
As preferably, described giant magnetoresistance effect sensing head comprises stationary pipes, coil and has the amorphous thin ribbon of giant magnetoresistance effect, amorphous thin ribbon is provided with in described stationary pipes, described stationary pipes is wound with coil, the input end of described coil connects the output terminal of the first resistance, the output head grounding of described coil.
As preferably, described detecting circuit comprises diode, the second resistance and the first electric capacity, the anode of described diode is connected with the output terminal of the first resistance, the negative electrode of described diode is connected with the input end of the second resistance, the first electric capacity and shaping circuit respectively, the output head grounding of described second resistance and the first electric capacity.
As preferably, described shaping circuit comprises 555 chips and the second electric capacity, the pin TR of described 555 chips is connected with the negative electrode of diode, the pin VCC of described 555 chips is connected with the pin R of 555 chips, the pin CV of described 555 chips is by the second capacity earth, the pin GND ground connection of described 555 chips, the pin IN of described 555 chips is connected with the negative electrode of diode.
The beneficial effects of the utility model:
1, structure is simple, and price is low, Miniaturized;
2, highly sensitive, operating distance can adjust according to the power of magnet, and reliability is high, long service life;
3, because amorphous thin ribbon used is annealed by 540 DEG C or passed through 45A/mm
2current annealing obtain, so general high temperature can be adapted to;
4, the signal exported is pulse signal, can be known the size of rotating speed by test frequency.Avoiding output signal is voltage signal, is inconvenience and the out of true of output signal reading in high speed or low speed;
5, directly drive singal is produced to the integrated chip that the driving of material have employed 8pin.Traditional type of drive jointly consists of 74HC04 and charge-discharge circuit, or BZ drives is examined in utilization.Compared with traditional type of drive: the signal stabilization that this type of drive produces, structure is simple
Feature of the present utility model and advantage will be described in detail by reference to the accompanying drawings by embodiment.
[accompanying drawing explanation]
Fig. 1 is the circuit diagram of a kind of speed probe based on giant magnetoresistance effect of the utility model;
Fig. 2 is the structural representation of giant magnetoresistance effect sensing head;
Fig. 3 is magnet mounting means figure.
In figure: 1-giant magnetoresistance effect sensing head, 2-signal generator module circuit, 3-detecting circuit, 4-shaping circuit, 5-magnet, 6-coil, 7-amorphous thin ribbon, 8-integrated chip, 9-first resistance, 10-diode, 11-second resistance, 12-first electric capacity, 13-second electric capacity, 14-555 chip, 15-copper-clad plate, 16-rotating disk, 17-stationary pipes.
[embodiment]
Consult Fig. 1, Fig. 2 and Fig. 3, a kind of speed probe based on giant magnetoresistance effect of the utility model, comprise giant magnetoresistance effect sensing head 1, signal generator module circuit 2, detecting circuit 3, shaping circuit 4 and magnet 5, the input end of described signal generator module circuit 2 connects direct supply VCC, the output terminal of described signal generator module circuit 2 is connected with the input end of giant magnetoresistance effect sensing head 1 and detecting circuit 3 respectively, the output terminal of described detecting circuit 3 is connected with the input end of shaping circuit 4, described magnet 5 is arranged on rotating disk 16, described signal generator module circuit 2 comprises integrated chip 8 and the first resistance 9, the pin VCC of described integrated chip 8 connects direct supply VCC, the pin GND ground connection of described integrated chip 8, the pin P3.3 of described integrated chip 8 is connected with the first resistance 9 input end, the output terminal of described first resistance 9 is connected with the input end of giant magnetoresistance effect sensing head 1 and detecting circuit 3 respectively, described integrated chip 8 is the integrated chip of 8pin, described giant magnetoresistance effect sensing head 1 comprises stationary pipes 17, coil 6 and the amorphous thin ribbon 7 with giant magnetoresistance effect, amorphous thin ribbon 7 is provided with in described stationary pipes 17, described stationary pipes 17 is wound with coil 6, the input end of described coil 6 connects the output terminal of the first resistance 9, the output head grounding of described coil 6, described detecting circuit 3 comprises diode 10, second resistance 11 and the first electric capacity 12, the anode of described diode 10 is connected with the output terminal of the first resistance 9, the negative electrode of described diode 10 respectively with the second resistance 11, first electric capacity 12 is connected with the input end of shaping circuit 4, the output head grounding of described second resistance 11 and the first electric capacity 12, described shaping circuit 4 comprises 555 chip 14 and the second electric capacity 13, the pin TR of described 555 chips 14 is connected with the negative electrode of diode 10, the pin VCC of described 555 chips 14 is connected with the pin R of 555 chips 14, the pin CV of described 555 chips 14 is by the second electric capacity 13 ground connection, the pin GND ground connection of described 555 chips 14, the pin IN of described 555 chips 14 is connected with the negative electrode of diode 10.
Described giant magnetoresistance effect sensing head 1 be adopt the enameled wire of φ 0.08mm to make around stationary pipes 17 and amorphous thin ribbon 7 hollow backbone on, the long 10mm of hollow backbone, internal diameter are 1.8mm, external diameter is that 2.2mm is with reference to figure 2.Design Fe used
76si
7.6b
9.5p
5c
1.9amorphous thin ribbon, it is of a size of: the thick 15um of the wide 0.78mm* of long 10mm*, and amorphous thin ribbon 7 is fixed by epoxy resin; Amorphous thin ribbon 7 is by current annealing or annealing temperature, the integrated chip 8 of signal generator module circuit 2 is chip STC15F104E, by the signal of the certain driving frequency of programming realization and certain dutycycle, the signal produced of the design is 490k, the signal of dutycycle 10%; Detecting circuit 3 is by schottky diode 10, and the second resistance 11, first electric capacity 12 is formed, and design parameter is: schottky diode sampled I N5818, and the resistance of the second resistance 11 is 680k, and the first electric capacity 12 is 0.1 μ F; Shaping circuit 4 is made up of 555 chips 14 and the second electric capacity 13, and wherein the capacitance of the second electric capacity 13 is 0.1 μ F.Concrete circuit application is: be integrated in by foregoing circuit in copper-clad plate 15, and magnet 5 is arranged on the side of rotating disk 16 with reference to figure 3
Utility model works process:
This sensor is developed based on giant magnetoresistance effect.Giant magnetoresistance effect refers to: refer under the excitation of exchange current, and the phenomenon of huge change occurs along with the change of extraneous Weak magentic-field in the impedance of soft magnetism conductor.Usually formula is seen with giant magnetic impedance than GMI (Z)
weigh the GMI characteristic under certain conditioning of a kind of material.
In formula: Z (H
ex) be external magnetic field H
extime material resistance value; Z (H
max) be that external magnetic field reaches capacity H
maxtime material resistance value.
When the magnetic field being applied to giant magnetoresistance effect sensing head 1 is different, it presents different impedance operators.Therefore draw different voltage when by connecting with the first resistance 9.The magnetic field applied is provided by the magnet 5 be fixed on rotating disk.Whenever magnet 5 diminishes close to making the impedance of material during giant magnetoresistance effect sensing head 1, when magnet 5 becomes large away from making the impedance of material during giant magnetoresistance effect sensing head 1.
Magnet 5 close to and away from continuous circulation, the signal of a similar sine wave will be produced, waveform is become have the square wave of certain dutycycle by shaping circuit 4.Rectangle wave number f order in unit interval be arranged on rotating disk upper magnet number p and rotating speed n is relevant, can be expressed by formula f=pn/60.
In formula: f is rectangle wave frequency; N is rotating speed, and unit is r/min; P is magnet 5 number on rotating disk.
Because f can be obtained by process chip.Produce interruption as accepted external pulse by single-chip microcomputer, thus know the square wave number in the unit interval, thus obtain rotating speed n by formula f=pn/60, reference formula n=60f/p.
Above-described embodiment is to explanation of the present utility model, is not to restriction of the present utility model, anyly all belongs to protection domain of the present utility model to the scheme after the utility model simple transformation.
Claims (5)
1. the speed probe based on giant magnetoresistance effect, it is characterized in that: comprise giant magnetoresistance effect sensing head (1), signal generator module circuit (2), detecting circuit (3), shaping circuit (4) and magnet (5), the input end of described signal generator module circuit (2) connects direct supply (VCC), the output terminal of described signal generator module circuit (2) is connected with the input end of giant magnetoresistance effect sensing head (1) and detecting circuit (3) respectively, the output terminal of described detecting circuit (3) is connected with the input end of shaping circuit (4), described magnet (5) is arranged on rotating disk (16).
2. a kind of speed probe based on giant magnetoresistance effect as claimed in claim 1, it is characterized in that: described signal generator module circuit (2) comprises integrated chip (8) and the first resistance (9), the pin VCC of described integrated chip (8) connects direct supply (VCC), the pin GND ground connection of described integrated chip (8), the pin P3.3 of described integrated chip (8) is connected with the first resistance (9) input end, the output terminal of described first resistance (9) is connected with the input end of giant magnetoresistance effect sensing head (1) and detecting circuit (3) respectively, the integrated chip that described integrated chip (8) is 8pin.
3. a kind of speed probe based on giant magnetoresistance effect as claimed in claim 1, it is characterized in that: described giant magnetoresistance effect sensing head (1) comprises stationary pipes (17), coil (6) and has the amorphous thin ribbon (7) of giant magnetoresistance effect, amorphous thin ribbon (7) is provided with in described stationary pipes (17), described stationary pipes (17) is wound with coil (6), the input end of described coil (6) connects the output terminal of the first resistance (9), the output head grounding of described coil (6).
4. a kind of speed probe based on giant magnetoresistance effect as claimed in claim 1, it is characterized in that: described detecting circuit (3) comprises diode (10), the second resistance (11) and the first electric capacity (12), the anode of described diode (10) is connected with the output terminal of the first resistance (9), the negative electrode of described diode (10) is connected with the input end of the second resistance (11), the first electric capacity (12) and shaping circuit (4) respectively, the output head grounding of described second resistance (11) and the first electric capacity (12).
5. a kind of speed probe based on giant magnetoresistance effect according to any one of Claims 1-4, it is characterized in that: described shaping circuit (4) comprises 555 chips (14) and the second electric capacity (13), the pin TR of described 555 chips (14) is connected with the negative electrode of diode (10), the pin VCC of described 555 chips (14) is connected with the pin R of 555 chips (14), the pin CV of described 555 chips (14) is by the second electric capacity (13) ground connection, the pin GND ground connection of described 555 chips (14), the pin IN of described 555 chips (14) is connected with the negative electrode of diode (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420738143.8U CN204203260U (en) | 2014-11-29 | 2014-11-29 | A kind of speed probe based on giant magnetoresistance effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420738143.8U CN204203260U (en) | 2014-11-29 | 2014-11-29 | A kind of speed probe based on giant magnetoresistance effect |
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| Publication Number | Publication Date |
|---|---|
| CN204203260U true CN204203260U (en) | 2015-03-11 |
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|---|---|---|---|
| CN201420738143.8U Expired - Fee Related CN204203260U (en) | 2014-11-29 | 2014-11-29 | A kind of speed probe based on giant magnetoresistance effect |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546272A (en) * | 2016-11-01 | 2017-03-29 | 浙江师范大学 | A kind of impedance sensor signal acquiring system |
| CN107884195A (en) * | 2017-10-12 | 2018-04-06 | 北京航天动力研究所 | A kind of speed probe and rotation-speed measuring device |
| CN111492206A (en) * | 2017-10-12 | 2020-08-04 | 维克多·瓦西洛尤 | Electromagnetic measuring system for distance or angle measurement based on the magnetoresistive effect |
-
2014
- 2014-11-29 CN CN201420738143.8U patent/CN204203260U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546272A (en) * | 2016-11-01 | 2017-03-29 | 浙江师范大学 | A kind of impedance sensor signal acquiring system |
| CN106546272B (en) * | 2016-11-01 | 2018-11-23 | 浙江师范大学 | A kind of impedance sensor signal acquiring system |
| CN107884195A (en) * | 2017-10-12 | 2018-04-06 | 北京航天动力研究所 | A kind of speed probe and rotation-speed measuring device |
| CN111492206A (en) * | 2017-10-12 | 2020-08-04 | 维克多·瓦西洛尤 | Electromagnetic measuring system for distance or angle measurement based on the magnetoresistive effect |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150311 Termination date: 20151129 |