CN208476951U - A kind of speed probe - Google Patents
A kind of speed probe Download PDFInfo
- Publication number
- CN208476951U CN208476951U CN201820878251.3U CN201820878251U CN208476951U CN 208476951 U CN208476951 U CN 208476951U CN 201820878251 U CN201820878251 U CN 201820878251U CN 208476951 U CN208476951 U CN 208476951U
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- annular magnet
- hall chip
- connecting rod
- pcb board
- multipole annular
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Abstract
A kind of speed probe, comprising: multipole annular magnet, connecting rod, pcb board and Hall chip；Multipair pole annular magnet is sheathed in connecting rod, and the driving end of the external slewing of connecting rod, connecting rod drives multipole annular magnet to circle under the driving of slewing；Hall chip is packaged on pcb board, and Hall chip is located at the side of multipole annular magnet, when the rotation of multipole annular magnet, Hall chip incudes multiple changes of magnetic field caused by multipole annular magnet rotors one week, in turn, Hall chip generates corresponding multiple pulse signals；The MCU encapsulated on pcb board is according to the revolving speed of the external slewing of pulse measure connecting rod.Multipole annular magnet rotates a circle, and Hall chip can generate multiple pulse signals, this substantially increases the quantity of pulse signal, reduce the error rate of tachometric survey compared with existing Hall chip generates single pulse signal.
Description
Technical field
The utility model relates to sensor technical fields, and in particular to a kind of speed probe.
Background technique
Existing speed probe calculates revolving speed size by the pulse signal that Hall chip generates, specifically, Hall core
Piece induction annular magnet rotates the changes of magnetic field generated and generates corresponding pulse signal, still, existing annular magnet rotation
Generate single changes of magnetic field within one week, in turn, Hall chip rotates a circle according to annular magnet can generate corresponding pulse letter
Number, it in the case that the pulse signal quantity caused by Hall chip is less, adds, Hall chip can be deposited in actual use
Cause output signal unstable in situations such as external disturbance, thus, the number of pulses for causing MCU to receive from Hall chip termination is big
It is big to reduce, it will lead to the calculated revolving speed size of MCU and actual speed in this case there are larger difference, precision is low.
Summary of the invention
The application provides a kind of speed probe, including multipole annular magnet, connecting rod, pcb board and Hall chip；
Multipair pole annular magnet is sheathed in connecting rod, and the driving end of the external slewing of connecting rod, connecting rod is rotating
Multipole annular magnet is driven to circle under the driving of equipment；
Hall chip is packaged on pcb board, and Hall chip is located at the side of multipole annular magnet, to multipole annular magnet
When rotation, Hall chip incudes multiple changes of magnetic field caused by multipole annular magnet rotors one week, and in turn, Hall chip generates
Corresponding multiple pulse signals；
The MCU encapsulated on pcb board is according to the revolving speed of the external slewing of pulse measure connecting rod.
In a kind of embodiment, the magnetic pole of multipole annular magnet is 4 pairs of magnetic poles.
In a kind of embodiment, the pole N of 4 pairs of magnetic poles and S is extremely uniformly staggered is distributed on multipole annular magnet.
In a kind of embodiment, be of coupled connections between the power end of Hall chip and ground terminal a varistor on pcb board.
In a kind of embodiment, be of coupled connections between the output and ground of the Hall chip capacitor on pcb board.
In a kind of embodiment, capacitor is patch capacitor.
According to the speed probe of above-described embodiment, since multipole annular magnet rotates a circle, Hall chip can generate more
A pulse signal, this substantially increases the quantity of pulse signal compared with existing Hall chip generates single pulse signal, reduces
The error rate of tachometric survey, improves the precision of tachometric survey；In addition, by Hall chip power end and ground terminal it
Between couple a varistor, and the coupling one capacitor between the output and ground of Hall chip, it is further provided Hall
The stability of chip.
Detailed description of the invention
Fig. 1 is speed probe structural schematic diagram；
Fig. 2 is multipole annular magnet arrangement schematic diagram；
Fig. 3 is another schematic diagram of speed probe structure
Fig. 4 is the circuit diagram of speed probe.
Specific embodiment
The utility model is described in further detail below by specific embodiment combination attached drawing.
In the utility model embodiment, improved by internal structure to speed probe and corresponding circuit,
The stability of Hall chip in precision and revolution speed sensing to improve speed probe measurement revolving speed.
The structure chart for the speed probe that this example provides is as shown in Figure 1, include multipole annular magnet 1, connecting rod 2, pcb board
3 and Hall chip 4；The multipole annular magnet 1 of this example is 4 pairs of magnetic poles, as shown in Fig. 2, the pole N of 4 pairs of magnetic poles and S extremely uniformly interlock
Be distributed on multipole annular magnet.Multipair pole annular magnet 1 is sheathed in connecting rod 2, the drive of the external slewing of connecting rod 2
Moved end, connecting rod 2 drive multipole annular magnet 1 to circle under the driving of slewing；Hall chip 4 is packaged in PCB
On plate 3, and Hall chip 4 is located at the side of multipole annular magnet 1, and when multipole annular magnet 1 rotates, Hall chip 4 incudes
Multipole annular magnet 1 rotates multiple changes of magnetic field caused by one week, and in turn, Hall chip 4 generates corresponding multiple pulse letters
Number；The revolving speed that the MCU encapsulated on pcb board 3 connects slewing according to outside pulse measure connecting rod 2.
The Hall chip 4 of this example can be directly affixed on pcb board 3, can also be plugged on pcb board 3, as shown in figure 3, not
How to be encapsulated by Hall chip 4 and pcb board 3, as long as Hall chip 4 can sense the magnetic field that more rotations of dish annular magnet 1 generate
Variation.
By above-mentioned design, when multipole annular magnet 1 rotates a circle, Hall chip 4 can sense that 4 magnetic fields become
Change, so that 4 pulse signals of output are incuding specifically, Hall chip 4 exports high level when sensing that S pole field increases
Low level is exported when reducing to S pole field, by taking multipole annular magnet 1 rotates 100 weeks as an example: if generated within 100 periods
2 external disturbances, then tachometric survey error rate is (((400-398)/4)/100) × 100%=0.5%；Existing 1 pair of pole is filled
The speed error rate of magnetic mode is ((100-98)/100) × 100%=2%.By calculating it can be seen that being measured in this example
Speed error rate is far below existing scheme, and the revolving speed of measurement is more accurate.
In addition, Hall chip 4 is punctured by high voltage transient spike in order to prevent, the pcb board 3 of this example is in Hall chip 4
Power end and ground terminal between the varistor 5 that is of coupled connections pass through varistor 5 while detecting revolving speed
The high voltage transient spike in pcb board 3 in circuit is absorbed, protects other electronic devices in circuit not by high voltage transient spike
Pulse breakdown.
Further, in order to guarantee the stability of 4 output signal of Hall chip, in Hall chip 4 on the pcb board 3 of this example
Be of coupled connections a capacitor 6 between output and ground, which is patch capacitor, defeated to Hall chip 4 by the capacitor 6
The interference noise of signal is filtered out out, and the circuit of the speed probe of this example is as shown in Figure 4.
Use above specific case is illustrated the utility model, is merely used to help understand the utility model, and
Not to limit the utility model.Think of for those skilled in the art of the present invention, according to the utility model
Think, several simple deductions, deformation or replacement can also be made.
Claims (6)
1. a kind of speed probe characterized by comprising multipole annular magnet, connecting rod, pcb board and Hall chip；
The multipole annular magnet is sheathed in the connecting rod, the driving end of the external slewing of connecting rod, the company
Extension bar drives the multipole annular magnet to circle under the driving of the slewing；
The Hall chip is packaged on the pcb board, and the Hall chip is located at the side of the multipole annular magnet, to
When the multipole annular magnet rotates, the Hall chip incudes multiple magnetic caused by described multipole annular magnet rotors one week
Field variation, in turn, the Hall chip generate corresponding multiple pulse signals；
The revolving speed of the external slewing of the MCU encapsulated on the pcb board connecting rod according to the pulse measure.
2. speed probe as described in claim 1, which is characterized in that the magnetic pole of the multipole annular magnet is 4 pairs of magnetic poles.
3. speed probe as claimed in claim 2, which is characterized in that the pole N of 4 pairs of magnetic poles and S are extremely uniformly staggered
It is distributed on the multipole annular magnet.
4. speed probe as described in claim 1, which is characterized in that in the power supply of the Hall chip on the pcb board
Be of coupled connections a varistor between end and ground terminal.
5. speed probe as described in claim 1, which is characterized in that in the output of the Hall chip on the pcb board
Be of coupled connections a capacitor between end and ground terminal.
6. speed probe as claimed in claim 5, which is characterized in that the capacitor is patch capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820878251.3U CN208476951U (en) | 2018-06-07 | 2018-06-07 | A kind of speed probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820878251.3U CN208476951U (en) | 2018-06-07 | 2018-06-07 | A kind of speed probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208476951U true CN208476951U (en) | 2019-02-05 |
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ID=65216835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820878251.3U Active CN208476951U (en) | 2018-06-07 | 2018-06-07 | A kind of speed probe |
Country Status (1)
| Country | Link |
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| CN (1) | CN208476951U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405828A (en) * | 2021-06-21 | 2021-09-17 | 徐州徐工矿业机械有限公司 | Engineering machinery rotation period time capturing device and measuring method thereof |
| CN114719943A (en) * | 2022-03-03 | 2022-07-08 | 联陆智能交通科技(上海)有限公司 | Electronic scale |
-
2018
- 2018-06-07 CN CN201820878251.3U patent/CN208476951U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405828A (en) * | 2021-06-21 | 2021-09-17 | 徐州徐工矿业机械有限公司 | Engineering machinery rotation period time capturing device and measuring method thereof |
| CN114719943A (en) * | 2022-03-03 | 2022-07-08 | 联陆智能交通科技(上海)有限公司 | Electronic scale |
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