CN103884859A - Magnetoelectric velocity transducer with self-checking function - Google Patents
Magnetoelectric velocity transducer with self-checking function Download PDFInfo
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- CN103884859A CN103884859A CN201410068676.4A CN201410068676A CN103884859A CN 103884859 A CN103884859 A CN 103884859A CN 201410068676 A CN201410068676 A CN 201410068676A CN 103884859 A CN103884859 A CN 103884859A
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Abstract
The invention discloses a magnetoelectric velocity transducer with a self-checking function. The magnetoelectric velocity transducer comprises an inner core component arranged inside an outer shell, the inner core component comprises a connecting support, an induction element, coils, a permanent magnet and a circuit board, the induction element is fixed to the front portion of the connecting support, the coils are fixed to the periphery of the middle segment of the connecting support, the permanent magnet is arranged in an inner cavity of the connecting support, the circuit board is fixed to the rear portion of the connecting support, a signal processing circuit and a power source circuit are integrated in the circuit board, the induction element and the coils are respectively and electrically connected with the circuit board, and after the induction element inducts magnetic field changes generated after the coils are powered on, processing is carried out by the circuits integrated in the circuit board to output square signals. Whether the function of the transducer and a detection signal link are normal or not can be detected by the transducer without dismounting the transducer, the operation is easy and convenient, and the structure is compact.
Description
Technical field
The present invention relates to magnetoelectric velocity transducer.
Background technology
Magnetoelectric velocity transducer generally comprises sensing element, permanent magnet, power supply, signal processing circuit, sensor housing assembly etc., measuring principle as shown in Figure 1, magnet steel in sensor housing or other permanent magnet produce magnetic field, sensing element is set in magnetic field, be permeability magnetic material by measure speed gears, there is magnetic conductivity, in gear rotation process, the gear teeth of gear, teeth groove replaces the sensing element in proximity transducer, cause that sensing element magnetic field intensity around sends alternately variation, sense element senses is to changes of magnetic field, signal processing circuit is processed the magnetic field variation signal that sense element senses arrives, and export square-wave signal, the frequency of square-wave signal is directly proportional to the rotating speed of gear, according to square wave frequency, the number of teeth of gear can calculate the rotating speed of gear.
Existing magnetoelectric velocity transducer generally only possesses speed measuring function, be equipped with before the locomotive operation of speed pickup, cannot detection speed sensor speed measuring function and locomotive speed detection signal chain whether normal, be unfavorable for trouble-saving generation, indirectly increase the failure rate after locomotive operation, and speed pickup in use for some time, if whether detect speed measuring function normal, generally to send speed pickup back to former factory or metering inspection center, be arranged on and on corresponding test board, carry out functional test, this gives the use of speed pickup, detection causes very large inconvenience.
The existing magnetoelectric velocity transducer that possesses self-checking function, wherein a kind of self test mode adopts and passes through Redundancy Design, the identical speed pickup of device two cover, whether unanimously judge that by the result that tests the speed that compares two sensors whether speed pickup is normal, under the condition that this mode can only put into operation at sensor, contrast; Other self test mode is by detecting the mechanical signal except rate signal, for example, by detecting the attraction causing because of changes of magnetic field or the rule that discharges armature, judge that by the tachometer signal that compares mechanical signal and sensor whether sensor is normal.
Summary of the invention
Technical matters to be solved by this invention is overcome the above-mentioned deficiency of prior art and a kind of magnetoelectric velocity transducer with self-checking function is provided, not only can before coming into operation, this sensor detect its function and whether detection signal chain is normal, and after coming into operation, can carry out self-inspection to it without dismounting.
The present invention addresses the above problem adopted technical scheme: with the magnetoelectric velocity transducer of self-checking function, comprise the core assembly that is positioned at enclosure, interior core assembly comprises connection bracket, sensing element, coil, permanent magnet, circuit board, the fixing sensing element in front portion of connection bracket, the peripheral fixed coil in connection bracket stage casing, in connection bracket inner chamber, permanent magnet is set, the rear portion fixing circuit board of connection bracket, integrated signal treatment circuit in circuit board, power circuit, sensing element, coil is electrically connected with circuit board respectively, sense element senses is to the changes of magnetic field producing after coil electricity and export square-wave signal after processing of circuit integrated in circuit board.
Preferred connection mounting structure: comprise sensing element mount pad, cylindrical wires ring framework, mounting bracket; Coil rack outer cover installs coil; Coil rack front end is fixed sensing element mount pad, on sensing element mount pad, has mounting groove, and mounting groove is embedded in sensing element; Coil rack rear end mounting bracket, circuit board is fixed on the end of mounting bracket, in coil rack, mounting bracket internal cavities, places permanent magnet.
For playing magnet accumulating cap, in coil rack, mounting bracket internal cavities, also place iron core.
The connection mounting structure of further optimizing: the side of sensing element mount pad, mounting bracket has many troughs, in trough, lay the lead-in wire of sensing element and the lead-in wire of coil, the end of mounting bracket has draw-in groove, the link of circuit board has gap, and draw-in groove coordinates the end that makes circuit board be fixed on mounting bracket with gap.
On foregoing circuit plate, be also integrated with surging protection circuit, reverse-connection preventing circuit, filtering circuit.
Above-mentioned shell comprises head shell, mount pad, afterbody housing, pipe adapter, head shell and afterbody housing are fixedly connected on mount pad, head shell and afterbody enclosure interior are held interior core assembly and filled with has fluid sealant, pipe adapter to be fixedly connected on the other end of afterbody housing.
Above-mentioned sensing element can be Hall element, can be also the sensitive element based on magnetoresistance, is Hall element preferably.
Above-mentioned permanent magnet is integrated on Hall element, and this spline structure is simpler.
The invention has the advantages that: 1, in connection bracket, fix sensing element, coil, after passing into alternating current in coil, produce alternating magnetic field, while needing self-inspection, the alternating current of input given frequency in coil, coil periphery produces alternating magnetic field, sense element senses is to alternating magnetic field, after processing, signal exports square-wave signal, by the frequency of alternating current relatively and whether the frequency of square-wave signal is consistent judges that whether sensor is normal, the alternating magnetic field simulation gear namely producing by alternating current driver rotates the changes of magnetic field causing, more approach the self-inspection under true service condition, that detects is accurate, and can realize sensor before installation, before using after installing, or do not need removal sensor can carry out function self-inspection after using a period of time, simple to operation.2, adopt alternating current driver coil to produce alternating magnetic field, adopt the poly-magnetic of iron core, alternating magnetic field generation device is simple in structure, be easy to realize, and by the distance between the number of turns, the single coil of appropriate design coil, the homogeneity in magnetic field can be improved, the coil of the suitable number of turns, single coil spacing can be selected according to service condition.3, interior core assembly relies on connection bracket by Hall element or the sensitive element based on magnetoresistance, permanent magnet, device and the coil for testing the speed such as circuit board, iron cores etc. integrate for the device of self-inspection, compact conformation, realize modular design, be beneficial to mass production, connection bracket can be by sensing element mount pad, coil rack and mounting bracket integral type are made, easily manufactured, sensing element mount pad, on mounting bracket, have the trough of laying sensing element and coil lead, the end of mounting bracket also has draw-in groove, the link of circuit board has gap, facilitate circuit board location, make compact overall structure, being convenient to assembling uses.4, integrated signal treatment circuit, power circuit on circuit board, be also integrated with surging protection circuit, reverse-connection preventing circuit, filtering circuit, makes it have the functions such as multistage anti-interference protection function, output short circuit protection, reverse power connection protection.5, adopt the Hall element that is integrated with magnet steel as sensing element, integrated level is higher.
Brief description of the drawings
Fig. 1 is magnetoelectric velocity transducer measuring principle schematic diagram.
Fig. 2 is the structure cut-open view of sensor in the embodiment of the present invention one.
Fig. 3 is the assembly drawing of interior core assembly in Fig. 2.
Fig. 4 is the STRUCTURE DECOMPOSITION figure of interior core assembly in Fig. 2.
Fig. 5 is the assembly drawing of Fig. 2 housing.
Fig. 6 is the STRUCTURE DECOMPOSITION figure of Fig. 2 housing.
Fig. 7 is the circuit theory diagrams of the embodiment of the present invention.
Fig. 8 is the theory diagram of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiment, the present invention is further described.
Embodiment mono-:
Magnetoelectric velocity transducer with self-checking function as shown in Figure 2, comprises shell 1, is placed in the interior core assembly 2 of shell 1 inside.
As shown in Figure 3, Figure 4, interior core assembly 2 comprises connection bracket 21, Hall element 22, coil 23, circuit board 24, magnet steel 25, iron core 26 and connection line to the structure of interior core assembly 2.
The side of sensing element mount pad 211, mounting bracket 213 has many troughs 214, the lead-in wire 221 of the interior laying Hall element 22 of trough 214 and the lead-in wire of coil 23.
The end of mounting bracket 213 also has draw-in groove, and the link of circuit board 24 has gap, and draw-in groove coordinates the end that makes circuit board 24 be arranged on mounting bracket 213 with gap.
Permanent magnet adopts magnet steel, and magnet accumulating cap is played in the magnetic field that iron core 26 produces coil 23.
The structure of shell 1 as shown in Figure 5, Figure 6, comprises head shell 11, mount pad 12, afterbody housing 13, pipe adapter 14.One end opening of head shell 11, afterbody housing 13 both ends opens, head shell 11, afterbody housing 13 are fixedly connected on mount pad 12, and open butt joint, inside holds the interior core assembly 2 after assembling, wherein the one end at Hall element 22 places is positioned at the bottom of head shell 11, and circuit board 24 is positioned at afterbody housing 13, and pipe adapter 14 is fixedly connected on the other end of afterbody housing 13.Interior core assembly 2 packs into after shell 1, the interior perfusion fluid sealant of shell 1, the water proof and dust proof performance of core assembly 2 and the overall shock resistance of sensor in improving.
As shown in Figure 8, its course of work is for the course of work of this sensor and principle:
Test the speed in process, magnet steel 25 provides magnetic field as permanent magnet, Hall element 22 is positioned at this magnetic field as sensing element, when the gear that permeability magnetic material is made rotates, the gear teeth and teeth groove alternately approach the residing magnetic field of Hall element 22, cause Hall element 22 magnetic field intensity around to occur alternately to change, Hall element 22 can sense the variation of magnetic field intensity and induced signal is sent to signal processing circuit, process is processed the square-wave signal that output frequency is directly proportional to gear rotational speed, can calculate the rotating speed of gear according to the number of teeth of square wave frequency, gear.Test the speed in process, coil 23 is interior without passing into electric current.
While needing detecting sensor whether normal, gear stops operating, coil 23, iron core 26 and connecting circuit composition self-checking function module thereof, its coil 23 is as the device that can produce alternating magnetic field, alternating current is as the alternating signal of drive coil 23, when self-inspection, in coil 23, be connected with the alternating current of given frequency, coil 23 is connected after exchange current, can around coil 23, produce alternating magnetic field, Hall element 22 is positioned at this alternating magnetic field, can sense alternating magnetic field the output signal relevant to alternative frequency that coil 23 produces, again through signal processing circuit output square-wave signal, whether frequency by square-wave signal relatively judges that with whether the given frequency of alternating current is consistent whether sensor is normal, if both are consistent, Hall element 22 is described, the detection signal chain such as signal processing circuit are normal, as inconsistent, illustrate that sensing element or signal processing circuit are abnormal.
Embodiment bis-:
Adopt the sensitive element based on magnetoresistance to replace the Hall element 22 in embodiment mono-, other structure is identical with embodiment mono-with principle.While testing the speed, the sensitive element based on magnetoresistance can sense because gear rotates the changes of magnetic field causing, processes by signal the square-wave signal that output is relevant to gear rotational speed; When self-inspection, the sensitive element based on magnetoresistance can sense the alternating magnetic field that self-checking function module produces, and processes output square-wave signal by signal.
Embodiment tri-:
A kind of hall speed sensor with self-checking function, the Hall element that employing is integrated with magnet steel replaces the Hall element 22 in embodiment mono-, integrated magnet steel can replace the magnet steel 25 in embodiment mono-, integrated magnet steel provides the magnetic field while testing the speed as permanent magnet, therefore can save the magnet steel 25 in the interior core assembly 2 of embodiment mono-, other structure is identical with embodiment mono-with principle.
Claims (9)
1. the magnetoelectric velocity transducer with self-checking function, it is characterized in that: described sensor comprises the core assembly that is positioned at enclosure, interior core assembly comprises connection bracket, sensing element, coil, permanent magnet, circuit board, the fixing sensing element in front portion of connection bracket, the peripheral fixed coil in connection bracket stage casing, in connection bracket inner chamber, permanent magnet is set, the rear portion fixing circuit board of connection bracket, integrated signal treatment circuit in circuit board, power circuit, sensing element, coil is electrically connected with circuit board respectively, sense element senses is to the changes of magnetic field producing after coil electricity and export square-wave signal after processing of circuit integrated in circuit board.
2. the magnetoelectric velocity transducer with self-checking function according to claim 1, is characterized in that: described connection bracket comprises sensing element mount pad, cylindrical wires ring framework, mounting bracket; Coil rack outer cover installs coil; Coil rack front end is fixed sensing element mount pad, on sensing element mount pad, has mounting groove, and mounting groove is embedded in sensing element; Coil rack rear end mounting bracket, circuit board is fixed on the end of mounting bracket, in coil rack, mounting bracket internal cavities, places permanent magnet.
3. the magnetoelectric velocity transducer with self-checking function according to claim 1 and 2, is characterized in that: in described coil rack, mounting bracket internal cavities, also place iron core.
4. the magnetoelectric velocity transducer with self-checking function according to claim 3, is characterized in that: in described coil rack, mounting bracket internal cavities, also place iron core.
5. the magnetoelectric velocity transducer with self-checking function according to claim 1 and 2, it is characterized in that: the side of described sensing element mount pad, mounting bracket has many troughs, in trough, lay the lead-in wire of sensing element and the lead-in wire of coil, the end of mounting bracket has draw-in groove, the link of circuit board has gap, and draw-in groove coordinates the end that makes circuit board be fixed on mounting bracket with gap.
6. the magnetoelectric velocity transducer with self-checking function according to claim 1 and 2, it is characterized in that: described shell comprises head shell, mount pad, afterbody housing, pipe adapter, head shell and afterbody housing are fixedly connected on mount pad, head shell and afterbody enclosure interior are held interior core assembly and filled with has fluid sealant, pipe adapter to be fixedly connected on the other end of afterbody housing.
7. the magnetoelectric velocity transducer with self-checking function according to claim 1 and 2, is characterized in that: described sensing element is Hall element.
8. the magnetoelectric velocity transducer with self-checking function according to claim 7, is characterized in that: described permanent magnet is integrated on Hall element.
9. the magnetoelectric velocity transducer with self-checking function according to claim 1 and 2, is characterized in that: on described circuit board, be also integrated with surging protection circuit, reverse-connection preventing circuit, filtering circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410068676.4A CN103884859A (en) | 2014-02-27 | 2014-02-27 | Magnetoelectric velocity transducer with self-checking function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410068676.4A CN103884859A (en) | 2014-02-27 | 2014-02-27 | Magnetoelectric velocity transducer with self-checking function |
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| CN103884859A true CN103884859A (en) | 2014-06-25 |
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| CN201410068676.4A Pending CN103884859A (en) | 2014-02-27 | 2014-02-27 | Magnetoelectric velocity transducer with self-checking function |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443048A (en) * | 2016-11-29 | 2017-02-22 | 深圳供电局有限公司 | Device for detecting arc rotation speed of transverse magnetic field vacuum switch |
| CN107305241A (en) * | 2017-06-26 | 2017-10-31 | 美新微纳传感系统有限公司 | A kind of magnetic sensing device and its real-time self checking method |
| CN107942091A (en) * | 2017-10-19 | 2018-04-20 | 宁波中车时代传感技术有限公司 | A kind of traffic hall speed sensor and its manufacture method |
| CN110988379A (en) * | 2019-11-29 | 2020-04-10 | 苏州长风航空电子有限公司 | Rotating speed sensor |
| CN111024975A (en) * | 2019-12-23 | 2020-04-17 | 北京遥测技术研究所 | Rotational speed sensor based on differential Hall device |
| CN112581828A (en) * | 2020-12-09 | 2021-03-30 | 杭州优必学科技有限公司 | Operator-based object programming control system |
| CN114353852A (en) * | 2021-12-24 | 2022-04-15 | 中国船舶重工集团公司七五0试验场 | Self-checking method and device for electromagnetic sensor |
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| JPH1096763A (en) * | 1996-09-25 | 1998-04-14 | Toyota Motor Corp | Magnetic characteristic measuring method and measuring device for electromagnetic pickup sensor |
| CN2864680Y (en) * | 2005-12-02 | 2007-01-31 | 包头稀土研究院 | Iron-matrix block amorphous rotation speed sensor |
| US20090251134A1 (en) * | 2008-04-03 | 2009-10-08 | Denso Corporation | Rotation detection apparatus |
| US20100060264A1 (en) * | 2008-09-10 | 2010-03-11 | Smith William L | Self-testing sensor |
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2014
- 2014-02-27 CN CN201410068676.4A patent/CN103884859A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1096763A (en) * | 1996-09-25 | 1998-04-14 | Toyota Motor Corp | Magnetic characteristic measuring method and measuring device for electromagnetic pickup sensor |
| CN2864680Y (en) * | 2005-12-02 | 2007-01-31 | 包头稀土研究院 | Iron-matrix block amorphous rotation speed sensor |
| US20090251134A1 (en) * | 2008-04-03 | 2009-10-08 | Denso Corporation | Rotation detection apparatus |
| US20100060264A1 (en) * | 2008-09-10 | 2010-03-11 | Smith William L | Self-testing sensor |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443048A (en) * | 2016-11-29 | 2017-02-22 | 深圳供电局有限公司 | Device for detecting arc rotation speed of transverse magnetic field vacuum switch |
| CN107305241A (en) * | 2017-06-26 | 2017-10-31 | 美新微纳传感系统有限公司 | A kind of magnetic sensing device and its real-time self checking method |
| CN107942091A (en) * | 2017-10-19 | 2018-04-20 | 宁波中车时代传感技术有限公司 | A kind of traffic hall speed sensor and its manufacture method |
| CN110988379A (en) * | 2019-11-29 | 2020-04-10 | 苏州长风航空电子有限公司 | Rotating speed sensor |
| CN111024975A (en) * | 2019-12-23 | 2020-04-17 | 北京遥测技术研究所 | Rotational speed sensor based on differential Hall device |
| CN112581828A (en) * | 2020-12-09 | 2021-03-30 | 杭州优必学科技有限公司 | Operator-based object programming control system |
| CN112581828B (en) * | 2020-12-09 | 2022-07-08 | 杭州优必学科技有限公司 | Operator-based object programming control system |
| CN114353852A (en) * | 2021-12-24 | 2022-04-15 | 中国船舶重工集团公司七五0试验场 | Self-checking method and device for electromagnetic sensor |
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Application publication date: 20140625 |