CN1252477C - Nanometer magnetic sensitive speed sensor - Google Patents
Nanometer magnetic sensitive speed sensor Download PDFInfo
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- CN1252477C CN1252477C CN 200310108098 CN200310108098A CN1252477C CN 1252477 C CN1252477 C CN 1252477C CN 200310108098 CN200310108098 CN 200310108098 CN 200310108098 A CN200310108098 A CN 200310108098A CN 1252477 C CN1252477 C CN 1252477C
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Abstract
The present invention relates to a nano-magnetic sensitive rotating speed sensor, which belongs to a wheel machine tool and a motor, particularly to the technical field of sensing and detecting the rotation speed of an automobile wheel. The sensor comprises a sensing part and a post processing circuit part, wherein the sensing part of a magnetic circuit is almost closed, and is composed of a magnetic head, an iron base nano magnetic strip belt, an adjustable bias magnet and an outer shell. A coil L is wound outside the iron base nano magnetic strip belt. The post processing circuit part is composed of a voltage stabilizer, a magnetic sensitive vibrator, a filter amplifier, a shaper and an OC gate, and the sensing part and the post processing circuit part are connected together through the coil L. The magnetic head detects magnetic flux variation which is relevant to the rotation speed, and the magnetic flux variation is converted into electrical pulse signals after the magnetic flux variation is partially processed by the post processing circuit. The electrical pulse signals are rotation speed signals, and are output from the OC gate. The present invention has the advantages of high sensitivity, large detection distance of 2.5mm, high heat stability, working temperature ranging from-40 DEG C to 150 DEG C, strong electromagnetic interference resistance capability, long service life, etc. The present invention is especially suitable for measuring the rotation speed of an ABS of an automobile, a motor, various machine tools and a rotating shaft of a rolling machine.
Description
Technical field
The present invention relates to a kind of nanometer magnetosensitive speed probe, belong to wheel machinery and equipment, motor, especially automotive wheel revolution speed sensing and detection technique field.
Background technology
The ideal state of automobile brake is that the slip rate of wheel maintains between 8～35%, make wheel braking and do not obtain before the locking maximum and ground damping force and big vertically, lateral adhesion coefficient.The brake system that automobile is braked under above-mentioned ideal state is made up of speed probe control module and hydraulic pressure unit usually.That the speed probe of background technology mostly is greatly is induction, Huo Er and magneto-resistor speed probe, be installed in wheel rotate the wheel rim of gear near, detect the rotating speed of wheel.But there is weak point in varying degrees in they.
The shortcoming of induction speed probe is vehicle wheel rotational speed when too low, and flux change is extremely slow, and output signal is too little, is easy to cause leakage signal.In addition, the detection distance of this type of sensor, promptly the gap between the sensor head and the rim of gear only allows 0.5～1mm.
The shortcoming of ear speed probe is that sensitivity is low suddenly, and output signal is little, even through amplifying, detects distance and only reaches 0.2～0.5mm, and in addition, this class sensors temperature stability is poor, must carry out temperature compensation.
The shortcoming of magneto-resistor speed probe is that the sensitivity of this sensor is not high, and magnetic circuit is open, and anti-electromagnetic interference performance is poor.
Summary of the invention
The technical problem to be solved in the present invention is to release a kind of nanometer magnetosensitive speed probe, and this sensor has following advantage: (1) is highly sensitive, and it is big to detect distance; (2) temperature stability is good; (3) magnetic circuit of sensor is near sealing, and anti-electromagnetic interference performance is good.
Technical scheme of the present invention is to adopt following structure: nanometer magnetosensitive speed probe comprises transducing part and post processing circuitry part, magnetic head, iron-based sodium rice magnetic strap, adjustable bias magnet and shell are formed the transducing part of magnetic circuit near sealing, iron-based sodium rice magnetic strap is around with coil L, voltage stabilizer, magnetic sensitive vibrator, filter amplifier, former and OC door are formed the post processing circuitry part, two parts link together by coil L, magnetic head is surveyed the flux change relevant with rotating speed, through the post processing circuitry section processes, convert electric impulse signal to, be tach signal, export from the OC door.
Now describe technical scheme of the present invention in detail.A kind of nanometer magnetosensitive speed probe, comprise the post processing circuitry part, be installed in the printed board 7, this part is by voltage stabilizer, magnetic sensitive vibrator, filter amplifier, former and OC door are formed, magnetic sensitive vibrator, filter amplifier, former and OC door are cascaded into the post processing circuitry part by the voltage stabilizer power supply in turn, extension line 11 has three, respectively with+12V, OC door collector and ground wire connect, it is characterized in that, it also comprises transducing part, this part is by magnetic head 4, seal 5, coil 6 is L, skeleton 8, support 10 and shell 9, magnetic head 4 is cylinders of being made by soft iron, the end face of this cylinder and the center of bottom surface have mounting hole, the mounting hole of end face is built-in with cylindric magnet, sealing 5 is epoxy resin, coil 6, be that L is wrapped on the coil pipe, this coil pipe is built-in with iron-based sodium rice magnetic strap 13, skeleton 8 is abnormity components of being made by low dielectric loss material such as teflon, support 10 is pipes of being made by soft iron, have screw thread on the inwall of this pipe, be screwed with conducting magnet core 14 and adjustable bias magnet 15 in the support 10, one end of conducting magnet core 14 is shaped on mounting hole, shell 9 is cylinders of being made by soft iron, have wire hole 16 on the shell 9, adjustment hole 17 and mounting hole 18, magnetic head 4 and support 9 mounting hole by separately is socketed in the two ends of the coil pipe of coil 6 respectively in the mode of the coil pipe central lines of center line and coil 6, magnetic head 4 and adjustable bias magnet 15 relative magnetic poles are magnetic pole of the same name, magnetic head 4, the parts that the coil pipe of coil 6 and support 9 formed by screw 12 and screw retention in skeleton 8, printed board 7 is by the side of screw retention in skeleton 8, partly by coil 6, promptly L links together for transducing part and post processing circuitry, and skeleton 8 connects together with shell 9, extension line 11 is drawn through wire hole 16, seals 5 capping mounting holes 18.
Another technical matters that the present invention will solve is to release the method for utilizing above-mentioned nanometer magnetosensitive speed probe to measure swing pinion 2 rotating speeds, it is characterized in that, concrete operations are as follows: this sensor is fixed near the wheel rim of swing pinion 2 with the normal direction coincidence system of its centerline direction and swing pinion 2, the end face of magnetic head 4 and wheel rim are at a distance of reaching 2.5mm, in the extension line 11+12V and ground wire respectively with the 12V power supply just, negative pole connects, electric impulse signal, be the three piece line output of tach signal from extension line 11, by measuring the frequency of this signal, just can measure the rotating speed of swing pinion 2 to be measured.
Principle of work:
This sensing is mainly used in the rotating speed of sensing rotating shaft.Now the rotating shaft device for testing rotating speed that uses with anti-locking system for car illustrates it as example.This device mainly is made up of ferromagnetic gear and nanometer magnetosensitive speed probe, ferromagnetic gear is coaxial with wheel, nanometer magnetosensitive speed probe is by near the wheel rim that is installed in ferromagnetic gear, the spacing that gear and nanometer magnetosensitive speed probe magnetic head end are maintained fixed.When the outstanding end of gear was close with magnetic head, because both gaps diminish relatively, magnetic flux increased; When the recess of gear and magnetic head 4 were close, the gap increased, and magnetic flux reduces.Will cause the significant change of the iron-based sodium rice magnetic strap magnetoimpedance that places the magnetic head afterbody like this.By the conversion of circuit, tooth is protruding once will export the pulse signal of a standard with the every conversion of mark of mouth.The output pulse number is directly proportional with the number of teeth and gear rotational speed, thereby reaches the purpose of measuring vehicle wheel rotational speed and car speed, and output pulse amplitude does not change with the rotary speed variation.
Compare advantage of the present invention with background technology:
The present invention has mainly utilized the nano microcrystalline magnetic material to have giant magnetic effect and a kind of magnetosensitive speed probe of being developed into.When very little flux change appears in external magnetic field, the AC impedance of material is changed a lot.Its relative sensitivity can reach 1.0V/KA/m, than Hall element and magneto-resistance device highly sensitive tens times, simultaneously since this material through pyroprocessing, even material still can demonstrate giant magnetoresistance effect more than 300 ℃, thereby device has high thermal stability.The sensing magnetic circuit is near sealing, and anti-electromagnetic interference performance is good.
Description of drawings
Fig. 1 is the synoptic diagram that sensor of the present invention and swing pinion 2 are formed device for testing rotating speed, and wherein 1 is the rotating shaft center, the 3rd, and the gear teeth.Fig. 2 is a structural representation of the present invention.Fig. 3 is the circuit structure block diagram of the post processing circuitry part of sensor of the present invention.Fig. 4 is the circuit diagram of the post processing circuitry part of sensor of the present invention.
Embodiment
Embodiment
Magnetic head adopts φ 2 * 2mm cylindrical permanent magnet.
Adjustable bias magnet adopts the permanent-magnet ferrite of φ 4 * 6mm band.
The coil pipe of coil 6 is φ 2.5 * 12mm sealed ceramic pipe, and there is lid at two ends, and coil 6 usefulness φ 0.04mm high-performance enameled wires twine 120 circles outside above-mentioned ceramic pipe.
Iron-based nano-magnetic band 13 is iron-based nano microcrystalline FeCuNbSiB materials, size: 12 * 1 * 0.025mm.
Conducting magnet core 14 is soft iron core made of iron, size: φ 1 * 8mm.
Shell 9 is soft ferromagnetism shell made of iron.
Seal 5 cappings of casting for epoxy, between magnetic head 4, skeleton 8 and shell 9, play fixing and protective effect.
The circuit structure block diagram of the post processing circuitry part that present embodiment adopts and the circuit diagram of post processing circuitry part are shown in Fig. 3 and Fig. 4 respectively.
Nanometer magnetic sensitive speed sensor of the present invention has highly sensitive, and it is big to detect distance, reaches 2.5mm; Heat stability is good; Operating temperature-40～150 ℃; Anti-electromagnetic interference capability is strong and make With advantages such as the life-span are long, be particularly suitable for for anti-locking system for car, motor, all kinds of lathe, The detecting rotational speed of the rotating shaft of milling train.
Claims (2)
1. nanometer magnetosensitive speed probe, comprise the post processing circuitry part, be installed in the printed board (7), this part is by voltage stabilizer, magnetic sensitive vibrator, filter amplifier, former and OC door are formed, magnetic sensitive vibrator, filter amplifier, former and OC door are cascaded into the post processing circuitry part by the voltage stabilizer power supply in turn, extension line (11) has three, respectively with+12V, OC door collector and ground wire connect, it is characterized in that, it also comprises transducing part, this part is by magnetic head (4), seal (5), coil (6) is L, skeleton (8), support (10) and shell (9), magnetic head (4) is the cylinder of being made by soft iron, the end face of this cylinder and the center of bottom surface have mounting hole, the mounting hole of end face is built-in with cylindric magnet, sealing (5) is epoxy resin, coil (6), be that L is wrapped on the coil pipe, this coil pipe is built-in with iron-based sodium rice magnetic strap (13), skeleton (8) is the abnormity component of being made by low dielectric loss material such as teflon, support (10) is the pipe of being made by soft iron, have screw thread on the inwall of this pipe, be screwed with conducting magnet core (14) and adjustable bias magnet (15) in the support (10), one end of conducting magnet core (14) is shaped on mounting hole, shell (9) is the cylinder of being made by soft iron, have wire hole (16) on the shell (9), adjustment hole (17) and mounting hole (18), magnetic head (4) and support (9) mounting hole by separately is socketed in the two ends of the coil pipe of coil (6) respectively in the mode of the coil pipe central lines of center line and coil (6), the magnetic pole that magnetic head (4) is relative with adjustable bias magnet (15) is a magnetic pole of the same name, magnetic head (4), the parts that the coil pipe of coil (6) and support (9) are formed by screw (12) and screw retention in skeleton (8), printed board (7) is by the side of screw retention in skeleton (8), transducing part and post processing circuitry are partly by coil (6), be that L links together, skeleton (8) connects together with shell (9), extension line (11) is drawn through wire hole (16), seals (5) capping mounting hole (18).
2. utilize the described nanometer magnetosensitive of claim 1 speed probe to measure the method for swing pinion (2) rotating speed, it is characterized in that, concrete operations are as follows: this sensor is fixed near the wheel rim of swing pinion (2) with the normal direction coincidence system of its centerline direction and swing pinion (2), the end face of magnetic head (4) and wheel rim are at a distance of reaching 2.5mm, in the extension line (11)+12V and ground wire respectively with the 12V power supply just, negative pole connects, electric impulse signal, be the three piece line output of tach signal from extension line (11), by measuring the frequency of this signal, just can measure the rotating speed of swing pinion to be measured (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310108098 CN1252477C (en) | 2003-10-23 | 2003-10-23 | Nanometer magnetic sensitive speed sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310108098 CN1252477C (en) | 2003-10-23 | 2003-10-23 | Nanometer magnetic sensitive speed sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1538179A CN1538179A (en) | 2004-10-20 |
| CN1252477C true CN1252477C (en) | 2006-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310108098 Expired - Fee Related CN1252477C (en) | 2003-10-23 | 2003-10-23 | Nanometer magnetic sensitive speed sensor |
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| Country | Link |
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| CN (1) | CN1252477C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101298253B (en) * | 2008-06-23 | 2011-11-09 | 哈尔滨工业大学 | Wheel sensor |
| CN102435765A (en) * | 2011-10-26 | 2012-05-02 | 成都市翻鑫家科技有限公司 | Pulse output type rotation speed sensor |
| CN108089025A (en) * | 2016-11-21 | 2018-05-29 | 中国科学院宁波材料技术与工程研究所 | A kind of magnetoelectric tachometric transducer based on non-crystaline amorphous metal or nanometer crystal alloy |
| CN106526219A (en) * | 2016-11-24 | 2017-03-22 | 中国航空工业集团公司金城南京机电液压工程研究中心 | High-precision double-redundancy rotation direction-recognizable rotation speed sensor |
| CN107290694B (en) * | 2017-07-18 | 2020-12-18 | 上海交通大学 | Inductive magnetic sensor for inhibiting directional crosstalk and preparation method thereof |
| CN109322652B (en) * | 2018-12-10 | 2023-09-22 | 中国地质大学（武汉） | Turbine drilling tool rotating speed measuring nipple based on nano system |
| CN109870589A (en) * | 2019-04-04 | 2019-06-11 | 哈尔滨恒达交通设备技术开发有限公司 | A kind of velocity sensor |
| CN112763745B (en) * | 2020-12-16 | 2023-09-19 | 武汉汉昇电子科技有限公司 | ABS magnetoelectric wheel speed sensor for automobile |
| CN114814270B (en) * | 2022-04-14 | 2024-05-07 | 四川新川航空仪器有限责任公司 | Variable magnetic flux rotating speed sensor |
-
2003
- 2003-10-23 CN CN 200310108098 patent/CN1252477C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1538179A (en) | 2004-10-20 |
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