CN2094720U - Anti-interference magnetic sensor - Google Patents
Anti-interference magnetic sensor Download PDFInfo
- Publication number
- CN2094720U CN2094720U CN 91215537 CN91215537U CN2094720U CN 2094720 U CN2094720 U CN 2094720U CN 91215537 CN91215537 CN 91215537 CN 91215537 U CN91215537 U CN 91215537U CN 2094720 U CN2094720 U CN 2094720U
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- coil
- interference
- magnetic sensor
- utility
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- Train Traffic Observation, Control, And Security (AREA)
Abstract
The utility model provides an anti-interference magnetic sensor, which is a special equipment for automatic detection for trains which run on railways. The aim of the utility model is to solve the problem that magnetic sensors are easily interfered by a strong electromagnetic field which is caused by that tracks send back electric currents when the magnetic sensors are used in the electrized sections of the railways. The utility model is provided with an anti-interference coil; the connection between an inductor coil and the anti-interference coil is antiphase, so interfering signals which are generated by the two coils can be basically counteracted; the anti-interference capability and the signal-to-noise ratio of the magnetic sensors are enhanced more than an order of magnitude.
Description
Anti-interference magnetic sensor is a kind of specialized equipment that the railway operation train is detected automatically, and the various automation control appliances of railway interests and measuring instrument all will drive and trigger with it.
Domestic original magnetic sensor is to constitute around some circle leads on cylindrical magnet steel or U-shaped magnet steel monolateral, after being installed in the rail side, owing to have very big alternation loopback electric current to pass through on the rail of railway electrification section, form powerful ac magnetic field on every side, thereby make the magnetic sensor coil generation three ten-day period of hot season even number pick up the interference voltage of volt, influenced the operate as normal of various instrument and equipments, the safe operation of train has been brought very big threat.
The purpose of this utility model is the interference that makes magnetic sensor energy anti-electromagnetic field, thereby guarantees the instrument and equipment operate as normal, and reliability is greatly improved.
Utility model be achieved in that on the magnet steel except that around on the inductive coil, other sets up anti-interference coil.Because anti-interference coil also produces one and the synchronous undesired signal of inductive coil under rail stream electromagnetic field effect, under these circumstances, anti-interference coil and inductive coil can allow the undesired signal that produces cancel out each other behind differential concatenation or reverse parallel connection.
Turn ratio between anti-interference coil and the inductive coil can change to some extent according to the difference of mutual alignment between the coil, but generally get between 0.15～1.5 times.
When anti-interference coil used single coil, operated by rotary motion when being divided into two coils, can be arranged on two sides of magnet steel in a side of magnet steel, perhaps all can be arranged on other positions of sensor.Anti-interference coil can be divided into several coils compositions and be arranged on any part that sensor can be provided with.Because anti-interference coil is not arranged in the magnetic circuit, therefore when train wheel passes through, have only inductive coil to produce effective induced signal; And in exchanging electric interfering field, anti-interference coil and inductive coil will produce undesired signal simultaneously, and their undesired signal is a homophase.So anti-interference coil and inductive coil have just reached the effect that effective induced signal is constant substantially, interference signals is cancelled each other that makes through accurate coupling with after reverse the connection.
After having taked abovementioned technology, aspects such as performance that anti-interference magnetic sensor disturbs at anti-electromagnetic field than former magnetic sensor and signal to noise ratio (S/N ratio) have improved one more than the order of magnitude.
The concrete structure of utility model is provided by following examples and accompanying drawing thereof.Accompanying drawing is to cut open the figure synoptic diagram according to the anti-interference magnetic sensor that the utility model proposes.
Describe in detail according to detail and the working condition that the utility model proposes below in conjunction with accompanying drawing.
This device is a hermetic housing (1).A magnet steel (2) is arranged in the housing (1), on it around inductive coil (3).The side of magnet steel (2) is provided with an anti-interference coil (4), and two coils are connected in series by anti-phase, i.e. the initial tap of two coils links to each other, and the end tap and the cutout screen of two coils close cable and link to each other.Whole device is close to rail head of rail (5) lower concave part on one side by dress the time, fixing by unit clamp (6).
When the rim section of train wheel (7) is passed through the pole-face of magnet steel (2), inductive coil (3) will produce effective induced signal, two coils are subjected to the alternating electromagnetic field interference that rail loopback electric current takes place simultaneously, the undesired signal of homophase will be produced, because two coils are anti-phase to be connected in series, so interference signals is cancelled each other.In like manner, if the connection of two coil parallel connected in reverse phase also can be reached above effect fully.
Claims (3)
1, anti-interference magnetic sensor is one and goes up around inductive coil [3] and the Magnetic Induction device of forming at the magnet steel [2] of cylindrical or U type, it is characterized in that except that inductive coil [3], setting up in addition anti-interference coil [4], make under the interfere with electromagnetic field effect that track current forms, undesired signal size that anti-interference coil [4] and inductive coil [3] produce and phase place are near equating.Two coils can make the undesired signal basic neutralisation by after the anti-phase connection.
2, device according to claim 1 is characterized in that inductive coil (3) can anti-phasely be connected in series with anti-interference coil (4) also can parallel connected in reverse phase to be connected.
3, device according to claim 1 and 2 is characterized in that:
A. being provided with of anti-interference coil (4) can also can be divided into several coils and form singly with a coil;
B. this anti-interference coil (4) can be arranged on any part that sensor can be provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91215537 CN2094720U (en) | 1991-06-04 | 1991-06-04 | Anti-interference magnetic sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91215537 CN2094720U (en) | 1991-06-04 | 1991-06-04 | Anti-interference magnetic sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2094720U true CN2094720U (en) | 1992-01-29 |
Family
ID=4923600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91215537 Withdrawn CN2094720U (en) | 1991-06-04 | 1991-06-04 | Anti-interference magnetic sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2094720U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109808732A (en) * | 2019-01-04 | 2019-05-28 | 东莞市诺丽电子科技有限公司 | Rail traffic vehicles Clearance Detection |
| CN113189655A (en) * | 2021-04-30 | 2021-07-30 | 上海领先仪器有限公司 | High anti-interference multichannel metal detection instrument |
-
1991
- 1991-06-04 CN CN 91215537 patent/CN2094720U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109808732A (en) * | 2019-01-04 | 2019-05-28 | 东莞市诺丽电子科技有限公司 | Rail traffic vehicles Clearance Detection |
| CN113189655A (en) * | 2021-04-30 | 2021-07-30 | 上海领先仪器有限公司 | High anti-interference multichannel metal detection instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |