CN204367911U - A kind of sensor that simultaneously can detect magnetic floating train suspending spacing and running velocity - Google Patents
A kind of sensor that simultaneously can detect magnetic floating train suspending spacing and running velocity Download PDFInfo
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- CN204367911U CN204367911U CN201420804362.1U CN201420804362U CN204367911U CN 204367911 U CN204367911 U CN 204367911U CN 201420804362 U CN201420804362 U CN 201420804362U CN 204367911 U CN204367911 U CN 204367911U
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Abstract
The utility model is a kind of sensor that simultaneously can detect magnetic floating train suspending spacing and running velocity, spacing detects and shares same set of probe coil with velocity measuring, probe coil is made up of 4 magnetic test coils, it is two right that magnetic test coil is divided into, two pairs of magnetic test coils are along the longitudinal 1/4 teeth groove element length D that staggers of track, the two row magnetic test coils that the often pair of magnetic test coil is 1/2 teeth groove element length D by the distance along track longitudinal direction again form, often row magnetic test coil is is then connected and composed by two equal-sized rectangle small coils transversely arranged along track, and direction of current in two adjacent small coils in every alignment circle is contrary.Magnetic test coil provides pumping signal by high-frequency signal source, the signal extracted by testing circuit also feed-in speed signal processing unit while feed-in distance signal processing unit.This sensor can detect train suspension spacing and running velocity simultaneously, and distance measurement does not affect by track tooth slot structure, and velocity measurement is not by suspension effect of distance, and the suspension Distance geometry running velocity detected accurately, reliably, precision is high.
Description
Technical field
The utility model relates to the noncontacting proximity sensor that a kind of magnetic floats car suspension spacing and running velocity.
Background technology
Magnetic-levitation train safe operation needs to suspend between detection train electromagnet and track in real time non-contactly spacing and train running speed, the track of high-speed maglev train is the long stator track that teeth groove replaces, tooth on track is all-metal body, groove is then the groove opened on metallic object, is wound with cable in groove.Magnetic float car commonly use range finding and tachogenerator be mostly based on electromagnetic induction principle realize measurement, when inductance type suspension pitch sensors moves in parallel on the surface of long stator track, change with track tooth slot position changes by output valve, there is so-called slot effect, produce the measured error (being also called teeth groove error) of vertical distance value.And general inductance type tachogenerator is just needing the tooth slot structure feature utilizing track, detect the change of track tooth slot position, step-by-step counting is being carried out to teeth groove, thus calculate train running speed.Visible track tooth slot structure feature is contrary at distance measurement with role in velocity measurement, therefore existing magnetic floats car needs the different sensor of two covers to detect magnetic floating train suspending spacing and running velocity respectively, by magnetic float the special suspension pitch sensors of car measure suspension spacing time, need the teeth groove error suppressing track tooth slot structure to bring, and when measuring the running velocity of train by another set of speed measuring device, need to utilize track tooth slot structure to improve velocity measuring precision.
Existing magnetic floats car suspension distance measurement many employings non-contact displacement sensor (pitch sensors), and sensor probe coil is embedded in electromagnet module, and its surface is equal with electromagnet surface.It realizes range observation based on electromagnetic induction principle, utilizes the distance that the probe coil in sensor comes between detection probe coil and tested metallic object (track long stator surface), realizes the detection of suspension spacing.According to its principle Analysis, when utilizing inductance type non-contact displacement sensor to find range, require that detected metal body surface should be the aspect of standard, if detected metal body surface is uneven, as magnetic floats vehicle commander's stator track, track is made tooth slot structure for laying stator coil by its surface, the now output of detecting device will affect by trade shape and produce obvious teeth groove error, make result of a measurement inaccurate, for meeting the requirement of magnetic floating train suspending control system, the mode optimizing probe coil geometric configuration is taked to weaken slot effect on the one hand, but teeth groove error can not be eliminated completely, another kind method newly arranges teeth groove compensating coil more in addition on the basis of original spacing detection probe coil, the position reference provided according to teeth groove compensating coil carries out certain compensation, its compensation effect and precision depend on the position reference that teeth groove compensating coil provides, and the introducing of compensating coil makes detection probe complex structure, and spacing magnetic test coil and compensating coil space overlap cause there is certain magnetic Field Coupling between coil, certain interference is produced to former spacing magnetic test coil, and position detection accuracy is not high, compensation effect and precision are subject to certain restrictions.
Existing magnetic floats automobile-used tachogenerator, mainly contain two kinds of methods, a kind of is the method adopting loop line or reveal coaxial cable, it is the loop line utilizing ground to lay or magnetic direction (or amplitude) change produced after revealing coaxial cable energising, to induct electric pulse in the vehicle-mounted receiving coil run, by realizing testing the speed to the counting of electric pulse, the method need ground install signal source, make track circuit cost increase and equipment is complicated; Another kind method adopts the vehicle-mounted sensor probe being furnished with heterogeneous rectangle plane coil, during train operation, change due to magnetic circuit makes the equivalent electric quantity parameter of square coil change, thus the output of circuit is changed, detect and process tooth, the groove signal that this change just can obtain orbital plane, by counting process, magnetic can be calculated and float the current speed of car.Two kinds of methods all need first to electric pulse counting, then calculate train running speed, and its calculation error is comparatively large, and precision is not high.
The main deficiency of present technology is exactly that needs two overlap different devices, make train or track structure complexity, cost is higher, distance measurement teeth groove error is large, velocity measurement precision is low, cannot meet high-speed magnetic floating car and carry out when high-speed cruising accurately controlling to guarantee the requirement that suspension spacing high precision is adjustable in real time.
Utility model content
The purpose of this utility model is to provide a kind of sensor that simultaneously can detect magnetic floating train suspending spacing and running velocity, this sensor accurately can detect train suspension distance values, and do not affect by track tooth slot position, accurately can measure train running speed simultaneously, and not by suspension effect of distance, the suspension Distance geometry running velocity detected accurately, reliably, precision is high.
The utility model is for realizing its utility model order, and the technical scheme adopted is:
A kind of sensor that simultaneously can detect magnetic floating train suspending spacing and running velocity, detect the sensor of magnetic floating train suspending spacing and running velocity simultaneously, comprise the probe coil be connected with high-frequency signal source on car body, the signal deteching circuit be connected with probe coil and export with signal deteching circuit the distance signal processing unit and speed signal processing unit that are connected.Magnetic test coil is divided into two couple laterally arranged side by side, that is: the first magnetic test coil to (L11, L12) and the second magnetic test coil to (L21, L22); First magnetic test coil is arranged along the longitudinal 1/4 teeth groove element length D that staggers of track to (L21, L22) to (L11, L12) and the second magnetic test coil; Two magnetic test coils of each magnetic test coil centering are that 1/2 teeth groove element length D arranges along the distance of track longitudinal direction, and each coil winding becomes along two transversely arranged equal-sized rectangle small coils of track, the direction of current in two the adjacent small coils between each coil is contrary; Two pairs of magnetic test coil input ends are connected respectively to two high-frequency signal sources (S1 and S2), and the frequency of two high-frequency signal sources is different; The mouth of two pairs of magnetic test coils is connected with separate two signal deteching circuits (PS1 with PS2) respectively; The mouth of two signal deteching circuits is connected with distance signal processing unit G with speed signal processing unit V separately respectively.
Like this, magnetic test coil provides pumping signal by high-frequency signal source, the two pairs of magnetic test coils respectively by two independently signal deteching circuit extract signal, the output of two signal deteching circuits also feed-in speed signal processing unit while feed-in distance signal processing unit, distance signal processing unit extracts distance signal, the distance value of output transducer detecting head surface and the track flank of tooth, speed signal processing unit extraction rate signal, output train running velocity value.
When magnetic-levitation train runs, be arranged on magnetic to float sensor on car and also suspend with train and advance along track longitudinal direction, sensor floats between car levitating electromagnet and the track flank of tooth while vertical suspension spacing detecting and export magnetic, also detects and output train running velocity.
Spacing detects and shares same set of probe coil with velocity measuring, probe coil is made up of the magnetic test coil that 4 shapes are identical with size, it is two right that 4 magnetic test coils are divided into, two pairs of magnetic test coils are along the longitudinal 1/4 teeth groove element length D that staggers of track, and two alignment circles in often pair of magnetic test coil are 1/2 teeth groove element length D along the distance of track longitudinal direction.Described coil arrangement can make each magnetic test coil area comparatively large, thus ensures that single coil has enough sensitivitys and accuracy of detection, and the spacing of coil also far can make the magnetic Field Coupling between each magnetic test coil less.
During train operation, magnetic test coil suspends with train and advances along track longitudinal direction, probe magnetic test coil and the track flank of tooth keep the specified suspension spacing of about 10mm, each magnetic test coil applies the pumping signal of alternation by high-frequency signal source, when single coil keep a certain suspension distance values constant and along track parallel longitudinal mobile time, owing to being permeability magnetic material in track tooth, coil is within the track teeth groove cycle during diverse location, the electric parameter of coil is different, when coil is just to track tooth center, its inductance value is maximum, during coil offset teeth center, its inductance value reduces, when coil is just to track groove center, its inductance value is minimum, when coil continues to depart from groove center, its inductance value can increase again.Therefore, when coil moves along track longitudinal direction, coil inductance is the mechanical periodicity by the change with track tooth slot position also, and its Changing Pattern shows as the Overlay of the trigonometric sine AC signal of a DC component and certain amplitude.When coil and the track flank of tooth are apart from time different, the fluctuation amplitude of this AC signal is different, when spacing is less, coil electric parameter is more responsive by the impact of permeability magnetic material in track tooth, and therefore a spacing hour coil inductance changes greatly, and when spacing is larger, track tooth slot structure is little on the impact of coil electric parameter, coil inductance change is less, and the Alternating Component amplitude of therefore inductance value change has reacted the size of spacing, and amplitude reduces with the increase of spacing.Another paired with it row magnetic test coil is along track longitudinal direction and it is at a distance of 1/2 teeth groove element length D, therefore when an alignment circle just obtains maximum induction value to the flank of tooth, another alignment circle is inevitable just obtains minimum inductance value to groove face, therefore two alignment circles include the signal of the corresponding tooth slot position relation of coil, two alignment coil structures are identical with circuit, therefore the DC component that two coils are corresponding is identical, and the amplitude of AC compounent is also identical, just AC compounent signal phase difference 180 ° (a teeth groove cycle is 360 °), in signal deteching circuit, subtract each other with two alignment ring signals in a pair magnetic test coil, dc component can be removed, export the sine wave signal of pure interchange, its fluctuation amplitude has reacted current spacing size, meanwhile, because two pairs of magnetic test coils are along the longitudinal 1/4 teeth groove element length D that staggers of track, therefore, another sine wave signal with the pure interchange of amplitude that coil is also exported after signal deteching circuit, and two sinusoidal ac signal phase differences are 90 °.Be that this two-way of 90 ° utilizes trigonometric function characteristic to carry out trigonometric function operation with the pure AC signal of amplitude to phase difference in distance signal processing unit, the amplitude of this AC signal can be obtained by abbreviation angle value (i.e. tooth slot position) of dividing out, this amplitude and suspension spacing are dull nonlinear correspondence relation, therefore in spacing processing unit, can obtain by linearity correction the distance values that suspends accurately, because angle value is divided out in signal processing, therefore the distance signal obtained and tooth slot position have nothing to do, can ensure that distance values does not affect by tooth slot position theoretically, namely spacing exports and there is not slot effect, be that this two-way of 90 ° carries out trigonometric function operation with the pure AC sine signal of amplitude to phase difference in speed signal processing unit, abbreviation amplitude signal of dividing out can obtain the phase angle value of current location again through inverse circular function computing, again differential process is carried out to this phase angle value, the running velocity that train is current can be obtained, because the alternating-current magnitude signal corresponding with distance values is divided out in signal processing, therefore velocity amplitude and spacing size have nothing to do, namely velocity amplitude is not by the impact of suspension spacing, and survey precision is high.
Compared with prior art, the beneficial effects of the utility model are:
One, distance measurement and velocity measurement unite two into one, economical and efficient, simplify train apparatus;
Two, in a space width, arrange a set of difunctional magnetic test coil, spacing detects and shares same set of probe coil with velocity measuring, and probe space availability ratio is high.The area that 4 magnetic test coils are larger in the probe space that limited teeth groove element length D is wide can improve accuracy of detection and sensitivity, and distantly between coil makes the magnetic Field Coupling between each magnetic test coil less;
Three, export distance values slotless error, compensate without the need to teeth groove, suspension spacing detects not to be affected by track tooth slot position, does not also namely affect by train running speed, is particularly suitable for the operational speed range of high-speed maglev train 0 ~ 500 kilometer/hour;
Four, speed signal processing unit carries out differential process to the phase signal extracted and calculates velocity amplitude, and its precision is far above the speed-measuring method counted with teeth groove, and survey precision is high.Velocity measurement is not by suspension effect of distance in addition, is particularly suitable for the occasion needing dynamic adjustments suspension spacing when magnetic-levitation train normally runs.
The arrangement mode of the often row magnetic test coil contained by above-mentioned probe coil is: connected and composed by two equal-sized rectangle small coils transversely arranged along track, and direction of current in two adjacent small coils in every alignment circle is contrary.The interference brought in space outerpace magnetic field can be weakened like this.
The mode that above-mentioned probe coil is connected from high-frequency signal source is: the frequency of corresponding two high-frequency signal sources connected of two pairs of magnetic test coils in probe coil is different.Like this, the independence being conducive to two pairs of magnetic test coil signals is extracted, and reduces mutual magnetic Field Coupling and circuit interference, improves precision and the accuracy of testing result.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is the arrangement of each magnetic test coil of the utility model embodiment and the schematic diagram of electric principle thereof.Solid small arrow direction on coil is feed-in direction of current, and the direction of hollow large arrow is the longitudinal direction of track.
Fig. 2 is the electrical principle structural representation of the utility model embodiment.
Detailed description of the invention
Fig. 1 and Fig. 2 illustrates, a kind of detailed description of the invention of the present utility model is: a kind of sensor that simultaneously can detect magnetic floating train suspending spacing and running velocity, comprises and to be connected probe coil, the signal deteching circuit be connected with probe coil with high-frequency signal source on car body and to export with signal deteching circuit the distance signal processing unit and speed signal processing unit that are connected; It is characterized in that, described magnetic test coil is divided into two couple laterally arranged side by side, namely the first magnetic test coil to (L11, L12) and the second magnetic test coil to (L21, L22); First magnetic test coil longitudinally to stagger 1/4 teeth groove element length D along track to (L21, L22) to (L11, L12) and the second magnetic test coil; Two magnetic test coils of each magnetic test coil centering are 1/2 teeth groove element length D along the distance of track longitudinal direction, and each coil winding becomes along two transversely arranged equal-sized rectangle small coils of track, and direction of current in two adjacent small coils between each coil is contrary; If be also that in a certain small coil, direction of current forms the direction of a circle conter clockwise everywhere, then the electric current flow through everywhere in separately adjacent small coil must form a circle clws direction.
Fig. 2 also illustrates:
The probe coil of this example from the mode that high-frequency signal source is connected is: the frequency of corresponding two high-frequency signal source S1 and S2 connected of two pairs of magnetic test coils (L11, L12 and L21, L22) in probe coil is different, and (namely a pair probe coil L11 and L12 is corresponding connects high-frequency signal source S1, another is connected high-frequency signal source S2 to probe coil L21 with L22 correspondence, and high-frequency signal source S1 is different with the frequency of high-frequency signal source S2).
The probe coil of this example to the concrete structure that signal deteching circuit is connected with signal processing unit is: often pair of magnetic test coil (L11, L12 or L21, L22) is connected with corresponding signal deteching circuit (PS1 or PS2), the output of two signal deteching circuits (PS1 and PS2) also feed-in speed signal processing unit (V) while feed-in distance signal processing unit (G), and distance signal processing unit and speed signal processing unit separate.Distance signal processing unit exports the suspension distance values not having teeth groove error, and speed signal processing unit can export high-precision train running speed value under any suspension spacing.
Claims (2)
1. one kind can be detected the sensor of magnetic floating train suspending spacing and running velocity simultaneously, detect the sensor of magnetic floating train suspending spacing and running velocity simultaneously, comprise the probe coil be connected with high-frequency signal source on car body, the signal deteching circuit be connected with probe coil and export with signal deteching circuit the distance signal processing unit and speed signal processing unit that are connected; It is characterized in that, magnetic test coil is divided into two couple laterally arranged side by side, that is: the first magnetic test coil to (L11, L12) and the second magnetic test coil to (L21, L22); First magnetic test coil is arranged along the longitudinal 1/4 teeth groove element length D that staggers of track to (L21, L22) to (L11, L12) and the second magnetic test coil; Two magnetic test coils of each magnetic test coil centering are that 1/2 teeth groove element length D arranges along the distance of track longitudinal direction, and each coil winding becomes along two transversely arranged equal-sized rectangle small coils of track, the direction of current in two the adjacent small coils between each coil is contrary; Two pairs of magnetic test coil input ends are connected respectively to two high-frequency signal sources (S1 and S2), and the frequency of two high-frequency signal sources is different; The mouth of two pairs of magnetic test coils is connected with separate two signal deteching circuits (PS1 with PS2) respectively; The mouth of two signal deteching circuits is connected with distance signal processing unit G with speed signal processing unit V separately respectively.
2. a kind of sensor that simultaneously can detect magnetic floating train suspending spacing and running velocity according to claim 1, it is characterized in that: the concrete structure that described probe coil is connected to signal deteching circuit is: two pairs of magnetic test coils are connected with corresponding signal deteching circuit respectively, and two signal deteching circuits (PS1 and PS2) are separate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420804362.1U CN204367911U (en) | 2014-12-17 | 2014-12-17 | A kind of sensor that simultaneously can detect magnetic floating train suspending spacing and running velocity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420804362.1U CN204367911U (en) | 2014-12-17 | 2014-12-17 | A kind of sensor that simultaneously can detect magnetic floating train suspending spacing and running velocity |
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| CN204367911U true CN204367911U (en) | 2015-06-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104553872A (en) * | 2014-12-17 | 2015-04-29 | 西南交通大学 | Sensor capable of simultaneously detecting suspension distance and running speed of magnetic-levitation train |
| CN113428189A (en) * | 2021-07-14 | 2021-09-24 | 中北大学 | Magnetic suspension train speed measurement positioning method based on induced voltage phase reversal |
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2014
- 2014-12-17 CN CN201420804362.1U patent/CN204367911U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104553872A (en) * | 2014-12-17 | 2015-04-29 | 西南交通大学 | Sensor capable of simultaneously detecting suspension distance and running speed of magnetic-levitation train |
| CN113428189A (en) * | 2021-07-14 | 2021-09-24 | 中北大学 | Magnetic suspension train speed measurement positioning method based on induced voltage phase reversal |
| CN113428189B (en) * | 2021-07-14 | 2022-09-06 | 中北大学 | Magnetic suspension train speed measurement positioning method based on induced voltage phase reversal |
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Granted publication date: 20150603 Termination date: 20171217 |