CN105333810A - Low-speed magnetic suspension train gap sensor in three-probe time sharing detection - Google Patents
Low-speed magnetic suspension train gap sensor in three-probe time sharing detection Download PDFInfo
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- CN105333810A CN105333810A CN201510738227.0A CN201510738227A CN105333810A CN 105333810 A CN105333810 A CN 105333810A CN 201510738227 A CN201510738227 A CN 201510738227A CN 105333810 A CN105333810 A CN 105333810A
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Abstract
The invention discloses a low-speed magnetic suspension train gap sensor in three-probe time sharing detection. The sensor comprises controllable high-frequency switches connected with high-frequency signal sources on a vehicle body, probe coils connected with the controllable high-frequency switches and signal detection circuits connected with the probe coils. The sensor is composed of three completely same probes; each probe comprises a detection coil, and the input end of each detection coil is respectively connected with the three controllable high-frequency switches; the three controllable high-frequency switches are respectively connected with the high-frequency signal sources; the output end of each detection coil is respectively connected with the mutually independent signal detection circuits (PS1, PS2 and PS3); and the controllable high-frequency switches and the signal detection circuit are also simultaneously connected with a sequential controller (T). According to the sensor, there is no frequency signal interference among the three probes, output signals of the three signal detection circuits are independent from each other, the frequencies of the three signal sources can be the same and can also be different, and the work state of any one detection channel does not affect detection results of other channels.
Description
Technical field
The present invention relates to a kind of magnetic floating train suspending gap non-contacting sensor.
Background technology
Magnetic-levitation train safe operation needs to detect levitation gap between train electromagnet and track in real time non-contactly, and the track of medium-and low-speed maglev train is " F type " track, and under various line condition, adjacent orbit junction remains with the gap of 1 ~ 4cm.Magnetic float car commonly use gap sensor be mostly based on eddy current principle realize measure, when current vortex levitation gap sensor moves in parallel in F rail detection faces, when magnetic test coil moves to track seam crossing, its output valve is by significant change, produce the measuring error of vertical gap width, therefore general magnetic-levitation train gap measurement at least needs two two magnetic test coils keeping certain distance, and when a coil is affected by seam, another coil still can detect correct gap width.Simultaneously for ensureing the reliable and security performance of the height of magnetic-levitation train, even if when adopting three cover probes to make one to pop one's head in lose efficacy, suspension controller still can be made to obtain correct gap width.
Existing medium-and low-speed maglev train levitation gap is measured and is adopted non-contact displacement sensor (gap sensor) more, need three probe coils to work simultaneously, although keep certain intervals distance between coil, but the space magnetic field interference between coil still exists, therefore the testing result of any one probe is all by the impact of another two coil working states, and its accuracy of detection and accuracy are all affected.
The main deficiency of present technology is exactly that three coils are when normally working, there is electromagnetic interference (EMI) each other, and when a certain map duty sudden change, the testing result of other two-way also can be affected, therefore its measuring accuracy is low, poor reliability, cannot meet magnetic and float car and operationally carry out controlling to guarantee the requirement that levitation gap high precision is adjustable in real time accurately.
Summary of the invention
The object of this invention is to provide a kind of three probe timesharing and detect medium-and low-speed maglev train gap sensor, this sensor accurately can detect train levitation gap value, without space magnetic field interference between triple coil, any one probe coil does not affect by other two probe coil working conditions.
The present invention is for realizing its goal of the invention, and the technical scheme adopted is:
A kind of three probe timesharing detect medium-and low-speed maglev train gap sensor, comprise the controlled HF switch be connected with high-frequency signal source on car body, the probe coil be connected with controlled HF switch, the signal deteching circuit be connected with probe coil.Sensor is made up of three duplicate probes; Each probe comprises a magnetic test coil, and point-blank, the spacing of arbitrary neighborhood two hub of a spool is all D to three center probes, and the size of each coil with around to identical; Each magnetic test coil input end is connected respectively to three controlled HF switch (K1, K2 and K3); Three HF switch are connected with high-frequency signal source (S1, S2 and S3) respectively; The output terminal of each magnetic test coil is connected with separate signal deteching circuit (PS1, PS2 and PS3) respectively; Controlled HF switch and signal deteching circuit also make the time schedule controller (T) of three time-sharing works of popping one's head in be connected with generation simultaneously.
Each high-frequency signal source is connected with corresponding magnetic test coil through corresponding controlled HF switch, and three high-frequency signal sources (S1, S2 and S3) are separate, and its frequency can be the same or different.Each magnetic test coil size is identical, around to identical, point-blank, staggered without space overlap between coil, any two adjacent windings central points are all D apart to the mid point of three coils mutually.Three gate-controlled switches (K1, K2 and K3) are controlled by time schedule controller (T), only have a switch to close in random time section.Three signal deteching circuits (PS1, PS2 and PS3) are also by being controlled by time schedule controller (T), only when respective switch closes, signal deteching circuit just detects corresponding signal, and the timesharing of three probes detects three independently gap widths.Any one probe coil does not affect by other two probe coil working conditions, independent mutually between the output of three signal deteching circuits (PS1, PS2 and PS3).
Like this, the duty of three magnetic test coils is subject to the control of three controlled HF switch, three coil time-sharing works can be made to the logic level that time schedule controller sends excessively, when time schedule controller (T) sends logic level, make to visit K switch 1 and close the t time, and at this moment between when K2 and K3 disconnects in section, magnetic test coil L1 is by the excitation of high-frequency signal source S1, normal work, the logic level that its information detection is also subject to time schedule controller controls normal work, thus this road signal exports current detection value.And now due to K switch 2 and K3 not closed, therefore magnetic test coil L2 and L3 opens a way, working coil L1 cannot produce induction current in L2 and the L3 coil of open circuit, therefore L2 and L3 coil can not affect the space distribution in L1 coil working magnetic field, L2 and L3 coil also can not produce magnetic interference to the external space when opening a way and not working simultaneously.Now passage 2 and passage 3 exported the detected value in a upper cycle.In like manner, when K2 closes K1 with K3 disconnect and K3 close and K1 with K2 disconnect time each coil duty similar.Therefore three probe timesharing detector gap values, export independently glitch-free three road gap widths mutually.
Because the frequency of operation of eddy current sensor can be arranged on more than 2MHz, and the frequency of operation of suspension controller is no more than 20KHz, the frequency of operation of driving source is more than 100 times of final required effective clearance signal as can be seen here, therefore the turn-on cycle of HF switch is suitably set, three tunnel testing results can be made all to meet the Signal Regulation requirement of suspension controller.
Compared with prior art, the invention has the beneficial effects as follows:
Do not have magnetic Field Coupling to disturb between the magnetic test coil of one, each road clearance measurement, improve the accuracy of detection of gap signal;
Independent between the output of two, each signal deteching circuit, the testing result on any road does not affect by the duty of other two-way, even if when catastrophic failure appears in a certain road, other two-way still can normally work, and improves the reliability of sensor;
Three, owing to there is no magnetic interference between each probe, only need to consider adjacent F rail gap width index when designing the spacing of adjacent probes, do not consider the magnetic Field Coupling interference between adjacent windings, therefore can reduce the distance between adjacent probes, sensor body sum weight is optimized.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the arrangement of each magnetic test coil of the embodiment of the present invention and the schematic diagram of electric principle thereof.
Fig. 2 is the electrical principle structural representation of the embodiment of the present invention.
Fig. 3 is the steering logic schematic diagram that the time schedule controller of the embodiment of the present invention exports.
Embodiment
Fig. 1 and Fig. 2 illustrates, a kind of embodiment of the present invention is: a kind of three probe timesharing detect medium-and low-speed maglev train gap sensor, comprise the controlled HF switch be connected with high-frequency signal source on car body, the probe coil be connected with controlled HF switch, the signal deteching circuit be connected with probe coil; It is characterized in that, sensor is made up of three duplicate probes; Each probe comprises a magnetic test coil, and point-blank, the spacing of arbitrary neighborhood two hub of a spool is all D to three center probes, and the size of each coil with around to identical; Each magnetic test coil input end is connected respectively to three controlled HF switch (K1, K2 and K3); Three HF switch are connected with high-frequency signal source (S1, S2 and S3) respectively; The output terminal of each magnetic test coil is connected with separate signal deteching circuit (PS1, PS2 and PS3) respectively; Controlled HF switch and signal deteching circuit are also connected with time schedule controller (T) simultaneously.
Fig. 3 illustrates, time schedule controller of the present invention controls three controlled HF switch (K1, K2 and K3) simultaneously, three switches close successively, phase 120 degree, synchronization is a closed switch only, namely synchronization only has a magnetic test coil job, and three coil timesharing detect and export independently gap width.
Each high-frequency signal source is connected with corresponding magnetic test coil through corresponding controlled HF switch, and three high-frequency signal sources (S1, S2 and S3) are separate, and its frequency can be the same or different.Each magnetic test coil size is identical, around to identical, point-blank, staggered without space overlap between coil, any two adjacent windings central points are all D apart to the mid point of three coils mutually.Three gate-controlled switches (K1, K2 and K3) are controlled by time schedule controller (T), only have a switch to close in random time section.Three signal deteching circuits (PS1, PS2 and PS3) are also by being controlled by time schedule controller (T), only when respective switch closes, signal deteching circuit just detects corresponding signal, and the timesharing of three probes detects three independently gap widths.Any one probe coil does not affect by other two probe coil working conditions, independent mutually between the output of three signal deteching circuits (PS1, PS2 and PS3).
Claims (6)
1. three probe timesharing detect a medium-and low-speed maglev train gap sensor, comprise the controlled HF switch be connected with high-frequency signal source on car body, the probe coil be connected with controlled HF switch, the signal deteching circuit be connected with probe coil; It is characterized in that, sensor is made up of three duplicate probes; Each probe comprises a magnetic test coil, and point-blank, the spacing of arbitrary neighborhood two hub of a spool is all D to three center probes, and the size of each coil with around to identical; Each magnetic test coil input end is connected respectively to three controlled HF switch (K1, K2 and K3); Three HF switch are connected with high-frequency signal source (S1, S2 and S3) respectively; The output terminal of each magnetic test coil is connected with separate signal deteching circuit (PS1, PS2 and PS3) respectively; Controlled HF switch and signal deteching circuit also make the time schedule controller (T) of three time-sharing works of popping one's head in be connected with generation simultaneously.
2. a kind of three probe timesharing according to claim 1 detect medium-and low-speed maglev train gap sensor, it is characterized in that: the separate setting of described three high-frequency signal sources (S1, S2 and S3), its frequency can be the same or different.
3. a kind of three probe timesharing according to claim 1 detect medium-and low-speed maglev train gap sensor, it is characterized in that: described probe coil arrangement concrete structure is: each magnetic test coil size is identical, around to identical, the mid point of three coils point-blank, staggered without space overlap between coil, any two adjacent windings central points are at a distance of being all D mutually.
4. a kind of three probe timesharing according to claim 1 detect medium-and low-speed maglev train gap sensor, it is characterized in that: described gate-controlled switch (K1, K2 and K3) is controlled by time schedule controller (T) in random time section, only having a switch to close.
5. a kind of three probe timesharing according to claim 1 detect medium-and low-speed maglev train gap sensor, it is characterized in that: described signal deteching circuit (PS1, PS2 and PS3) is by being controlled by time schedule controller (T), only when respective switch closes, signal deteching circuit just detects corresponding signal, and the timesharing of three probes detects three independently gap widths.
6. a kind of three probe timesharing according to claim 1 detect medium-and low-speed maglev train gap sensor, it is characterized in that: independent mutually between the output of described three signal deteching circuits (PS1, PS2 and PS3).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110081804A (en) * | 2019-05-22 | 2019-08-02 | 中国人民解放军国防科技大学 | Device and method for detecting dynamic performance of relative position sensor of maglev train |
| CN110525229A (en) * | 2019-10-10 | 2019-12-03 | 中车株洲电力机车有限公司 | The compensation method and compensation system of medium-and low-speed maglev train levitation gap |
| CN112781654A (en) * | 2020-12-31 | 2021-05-11 | 西南交通大学 | Crack steel rail gap fault detection system |
| CN116358401A (en) * | 2023-05-25 | 2023-06-30 | 宁波中车时代传感技术有限公司 | Medium-low speed magnetic levitation gap sensor and detection method thereof |
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