CN201589599U - Levitation space measuring apparatus of maglev train capable of compensating cogging effect - Google Patents
Levitation space measuring apparatus of maglev train capable of compensating cogging effect Download PDFInfo
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- CN201589599U CN201589599U CN2009203521772U CN200920352177U CN201589599U CN 201589599 U CN201589599 U CN 201589599U CN 2009203521772 U CN2009203521772 U CN 2009203521772U CN 200920352177 U CN200920352177 U CN 200920352177U CN 201589599 U CN201589599 U CN 201589599U
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Abstract
A levitation space measuring apparatus of maglev train capable of compensating cogging effect, a probe coil of which is composed of a displacement detecting coil and a compensating coil, wherein, the displacement detecting coil is composed of two identical 8-shaped detecting coils which are side by side along the rail transverse direction, two rectangular coils with the same sizes and opposite winding directions of the detecting coil are arranged along the rail transverse direction, the width of the detecting coil along the rail longitudinal direction is the length D of a rail gullet unit; the compensating coils are two pairs which are staggered for 1/4 gullet unit length D along the rail longitudinal direction, one pair of compensating coils are stacked in the range of the corresponding one detecting coil; each pair of compensating coils are composed of two columns of compensating coils with the distance along the rail longitudinal direction of 1/2 gullet unit length D. The measuring apparatus can compensate the cogging effect, the detected levitation distance is accurate and reliable, and the detecting precision is high.
Description
Technical field
The utility model relates to the non-contact measurement apparatus of the floating car suspension spacing of a kind of magnetic.
Background technology
The non-contact measurement apparatus (sensor) of the floating car suspension spacing of existing magnetic is based on the measurement that electromagnetic induction principle is realized distance, and it utilizes coil in the sensor to come distance between magnetic test coil and the tested metallic object (track), the detection of realization suspension spacing.
Noncontact displacement measuring device based on electromagnetic induction principle has polytype, the principle of work of a class inductance type noncontact displacement measuring device (sensor) wherein is: when having metallic object close near the magnetic test coil (probe coil) of energising, because metallic object has changed the magnetic resistance of the induced electromagnetic field magnetic circuit that magnetic test coil produced, thereby influence the inductance value of coil, therefore the inductance value of coil is relevant with distance between coil and the metallic object, and its pass is L=N
2μ S/2 δ, wherein N is a coil turn; μ is the air magnetoconductivity; S is the area that coil surrounds; δ is the distance of coil and detected metal body surface.Wherein the magnetic permeability mu of air is a constant, and N and S are definite value behind the coil coiled, and therefore, the inductance value L of coil is inversely proportional to the distance value δ of magnetic test coil and metal body surface.
During detection, high-frequency signal source is to magnetic test coil feed-in high frequency ac signal, this high-frequency signal produces induced electromotive force in magnetic test coil, the size of this induced electromotive force is relevant with the inductance value of coil, pick-up unit is measured the size of the formed voltage signal of this induced electromotive force, can obtain magnetic test coil and tested metal body surface apart from δ.
According to above principle Analysis as can be known, utilize inductance type non-contact displacement sensor when range finding, require detected metal body surface to be preferably the flat shape of standard, uneven as detected metal body surface, the output of pick-up unit will produce error, make measurement result inaccurate.
The high-speed maglev train development for guaranteeing the normal operation of high-speed maglev train, needs control train and interorbital vertical distance rapidly, and this distance is also measured with inductive displacement transducer usually.But because the track of high-speed maglev train is the long stator track that teeth groove replaces, tooth on the track is the all-metal body, groove then is the groove of opening on metallic object, be wound with cable in the groove, when inductive displacement transducer is mobile on the surface of long stator track, output valve will change with the cyclical variation of track teeth groove, so-called slot effect appears, produce the measuring error (being called the teeth groove error again) of vertical distance value, this teeth groove error makes that to detect output valve inaccurate, can't satisfy the high-speed magnetic floating car and carry out in real time the requirement of accurately control with the constant unanimity of spacing high precision of guaranteeing to suspend.
The utility model content
The purpose of this utility model provides the magnetic floating train suspending gap measuring device that can compensate slot effect, and this measurement mechanism can compensate slot effect, and detected suspension spacing is accurate, reliable, the precision height.
The utility model is realized its goal of the invention, the technical scheme that is adopted is: the magnetic floating train suspending gap measuring device that can compensate slot effect, comprise the probe coil that links to each other with high-frequency signal source on the car body, probe coil also links to each other with signal processing circuit, its design feature is: probe coil is made up of displacement detector coil and compensating coil
Wherein displacement detector coil is the magnetic test coil formation along horizontal two the 8 identical fonts side by side of track, each magnetic test coil is by two equal and opposite in directions, around being connected in series to opposite square coil, and also arrange along the track horizontal direction, magnetic test coil is track teeth groove element length D along the width of track longitudinal direction;
Compensating coil is two pairs, and the two pairs of compensating coils are along the track 1/4 teeth groove element length D that vertically staggers, in the scope of the superimposed magnetic test coil in correspondence of a pair of compensating coil; Every pair of compensating coil is again by forming apart from the two row compensating coils that are 1/2 teeth groove element length D longitudinally along track, every row compensating coil is then by connecting and composing along four transversely arranged equal-sized rectangle small coils of track, and the current opposite in direction in any adjacent small coil in every alignment circle.
Principle of work of the present utility model is:
When magnetic-levitation train was advanced, the probe coil that is installed on the floating car of magnetic was also advanced along the track longitudinal direction with car body, detected the vertical distance between floating car of magnetic and the track simultaneously:
Two independently displacement detector coil detect vertical distance between car body and the track, obtain two independently distance values, and because magnetic test coil is track teeth groove element length D along the width of track longitudinal direction; Therefore, include the teeth groove error consistent in these two distance values with track teeth groove cycle variation law.
Two alignment circles in the every pair of compensating coil along track longitudinally distance be 1/2 teeth groove element length D, therefore the phase differential of the induced electromotive force of two alignment circles generation is 180 °, in signal processing circuit, to be earlier two sine waves (induced electromotive force) signal subtraction of 180 ° with the phase differential of two alignment circles in a pair of compensating coil, can remove the direct current composition, export the sine wave signal of pure interchange; Simultaneously, because the two pairs of compensating coils are along the track 1/4 teeth groove element length D that vertically staggers, therefore, the phase differential of the sine wave signal of the pure interchange of two pairs of coil outputs is 90 °.In signal processing circuit, be that 90 ° the pure AC sine signal of this two-way carries out trigonometric function operation to phase differential again, can obtain the phase value of current location, and draw the vertical compensated distance value of teeth groove of current location correspondence by this phase value.
The spacing offset that two distance values that magnetic test coil is obtained and compensating coil obtain carries out analyzing and diagnosing by signal processing circuit and handles; Two distance values are added that respectively the spacing offset is as two independently spacing detected value outputs.Simultaneously the distance values after these two compensation is carried out diagnostic process, during greater than setting threshold, show that two magnetic test coils have at least one to be operated in abnomal condition as the difference of two distance values, diagnostic circuit will produce failure alarm signal this moment.
Compared with prior art, the beneficial effects of the utility model are:
One, the two row compensating coils that differ 1/2 teeth groove element length constitute a pair of compensating coil, differ 1/4 teeth groove element length between two pairs of compensating coils again, thereby after the output signal of these compensating coils carried out computing, can determine the position (phase place) of magnetic test coil in the teeth groove unit, and according to the different vertical distance offsets of diverse location correspondence, after the detected value of magnetic test coil compensated, output again.Eliminated the error that slot effect produces, testing result is reliable, and the precision height can satisfy high-speed maglev train the distance (vertical distance) that suspends is carried out accurate constant control requirement.
Two, utilize two displacement detector coil to detect, and testing result is carried out diagnostic handle, thereby guarantee the reliable of testing result: because various factors causes magnetic test coil to break down or during flase drop, the output valve difference of two magnetic test coils is excessive, system can produce alerting signal, avoid producing serious adverse consequences, guarantee the height reliability of the floating car suspension distance detecting of magnetic, with the security of operation of further assurance magnetic-levitation train.
Three, displacement detector coil by about two equal and opposite in directions form around being concatenated into 8 fonts to opposite square coil, because the induced electromotive force opposite sign but equal magnitude that in this coil, produces of external magnetic field in the same way, thereby can offset, therefore, can overcome the influence of external magnetic field its magnetic test coil.Equally, every row compensating coil is again by connecting and composing along four transversely arranged equal-sized small coils of track, and the current opposite in direction in any adjacent small coil in every alignment circle; Like this, can make compensating coil can not introduce magnetic interference, equally also can resist the influence of external magnetic field himself to displacement detector coil.Make device of the present utility model be particularly useful for the environment of this strong external magnetic field of magnetically supported vehicle.
Above-mentioned probe coil with the mode that high-frequency signal source links to each other is: the frequency of two high-frequency signal sources of the corresponding connection of two displacement detector coil in the probe coil is different, and the frequency of the high-frequency signal source that compensating coil connects is also different with the frequency of the high-frequency signal source of arbitrary displacement detector coil.
The corresponding high-frequency signal source that connects of above-mentioned two displacement detector coil is independent separately, and the high-frequency signal source that compensating coil connects also is high-frequency signal source independently.
Like this, help the independent of induction electromotive force electric signal and extract, reduce the phase mutual interference, improve the precision and the accuracy of testing result.
The concrete structure that above-mentioned probe coil links to each other with signal processing circuit is: each displacement detector coil links to each other successively with corresponding displacement signal processing unit, compensation operation unit, constitutes one group of independently testing circuit; Compensating coil all links to each other with compensating signal processing unit independently, and the output terminal of compensating signal processing unit links to each other with two compensation operation unit simultaneously; The output terminal of two compensation operation unit also all links to each other with the input end of diagnostic signal processing unit.
Like this, connect respectively in conjunction with two displacement detector coil two high-frequency signal sources independently, the utility model has the two independent high-frequency signal source, and input, processing and output circuit are guaranteed to detect output valve and are redundant two-way independence output valve.And can compare two-way independence output valve by the diagnostic signal processing unit, whether break down, and its judged result be exported, further guarantee measurement mechanism output result's reliability by the diagnostic signal processing unit thereby judge testing circuit.
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the arrangement of various coils of the utility model embodiment and the synoptic diagram of electric principle thereof.Solid small arrow direction on the coil is the feed-in direction of current, and the direction of hollow big arrow is the longitudinal direction of track.
Fig. 2 is the electrical principle structural representation of the utility model embodiment.
Embodiment
Fig. 1 and Fig. 2 illustrate, and a kind of embodiment of the present utility model is: can compensate the magnetic floating train suspending gap measuring device of slot effect, comprise the probe coil that links to each other with high-frequency signal source on the car body, probe coil also links to each other with signal processing circuit.Probe coil is made up of displacement detector coil and compensating coil.
Wherein displacement detector coil is magnetic test coil La, the Lb formation along horizontal two the 8 identical fonts side by side of track, each magnetic test coil La or Lb are by two equal and opposite in directions, around being connected in series to opposite square coil, and also arrange along the track horizontal direction, magnetic test coil La, Lb are track teeth groove element length D along the width of track longitudinal direction;
Compensating coil is two pairs, and two couples of compensating coil L1, L2 and L3, L4 be along the track 1/4 teeth groove element length D that vertically staggers, in the superimposed magnetic test coil La or the scope of Lb in correspondence of a pair of compensating coil L1, L2 or L3, L4; Every couple of compensating coil L1, L2 or L3, L4 again by along track longitudinally distance be that two row compensating coil L1, L2 or L3, the L4 of 1/2 teeth groove element length D forms, every row compensating coil L1, L2, L3 or L4 are then by connecting and composing along four transversely arranged equal-sized rectangle small coils of track, and the current opposite in direction in any adjacent small coil in every alignment circle.Also be that direction of current is if constitute the counterclockwise direction of a circle everywhere in a certain small coil, the electric current that flows through everywhere in the then adjacent small coil must constitute the clockwise direction of a circle.
Fig. 2 also illustrates:
The mode that this routine probe coil and high-frequency signal source link to each other is: two high-frequency signal source Sa that two displacement detector coil La in the probe coil and Lb be corresponding to be connected are different with the frequency of Sb (to be the corresponding high-frequency signal source Sa that is connected of displacement magnetic test coil La, the corresponding high-frequency signal source Sb that connects of displacement detector coil Lb, high-frequency signal source Sa is different with the frequency of high-frequency signal source Sb), the frequency of the high-frequency signal source Sc that compensating coil L1, L2, L3 and L4 are connected is also different with the frequency of the high-frequency signal source Sa of arbitrary displacement detector coil La or Lb or Sb.
Two displacement detector coil La of this example and the corresponding high-frequency signal source Sa that is connected of Lb and Sb be independence separately, and the high-frequency signal source Sc that compensating coil L1, L2, L3 and L4 are connected also is high-frequency signal source independently.
The concrete structure that this routine probe coil links to each other with signal processing circuit is: each displacement detector coil La or Lb and corresponding displacement signal processing unit A or B, compensation operation unit Pa or Pb link to each other successively, constitute one group independently testing circuit (be that displacement magnetic test coil La links to each other successively with corresponding displacement signal processing unit A, compensation operation unit Pa, constitute one group of independently testing circuit, displacement detector coil Lb links to each other successively with corresponding displacement signal processing unit B, compensation operation unit Pb, constitutes another and organizes independently testing circuit); Compensating coil L1, L2, L3 and L4 all link to each other with compensating signal processing unit C independently, and the output terminal of compensating signal processing unit C links to each other with Pb with two compensation operation unit Pa simultaneously; The output terminal of two compensation operation unit Pa and Pb also all links to each other with the input end of diagnostic signal processing unit Z.All these signal processing units and diagnostic process unit constitute signal processing circuit.
Claims (4)
1. magnetic floating train suspending gap measuring device that can compensate slot effect, comprise the probe coil that links to each other with high-frequency signal source on the car body, probe coil also links to each other with signal processing circuit, it is characterized in that: described probe coil is made up of displacement detector coil and compensating coil
Wherein displacement detector coil is magnetic test coil (La, the Lb) formation along horizontal two the 8 identical fonts side by side of track, each magnetic test coil (La or Lb) is by two equal and opposite in directions, around being connected in series to opposite square coil, and also arrange along the track horizontal direction, magnetic test coil (La, Lb) is track teeth groove element length D along the width of track longitudinal direction;
Described compensating coil is two pairs, and two pairs of compensating coils (L1, L2 and L3, L4) are along the track 1/4 teeth groove element length D that vertically staggers, in the scope of the superimposed magnetic test coil (La or Lb) in correspondence of a pair of compensating coil (L1, L2 or L3, L4); Every pair of compensating coil (L1, L2 or L3, L4) is again by forming apart from the two row compensating coils (L1, L2 or L3, L4) that are 1/2 teeth groove element length D longitudinally along track, every row compensating coil (L1, L2, L3 or L4) is then by connecting and composing along four transversely arranged equal-sized rectangle small coils of track, and the current opposite in direction in any adjacent small coil in every alignment circle.
2. the magnetic floating train suspending gap measuring device that compensates slot effect according to claim 1, it is characterized in that: described probe coil with the mode that high-frequency signal source links to each other is: the frequency of corresponding two high-frequency signal sources (Sa and Sb) that are connected of two displacement detector coil (La and Lb) in the probe coil is different, and the frequency of the high-frequency signal source (Sc) that compensating coil (L1, L2, L3 and L4) is connected is also different with the frequency of the high-frequency signal source (Sa or Sb) of arbitrary displacement detector coil (La or Lb).
3. the magnetic floating train suspending gap measuring device that compensates slot effect according to claim 2, it is characterized in that: the corresponding high-frequency signal source (Sa and Sb) that is connected of described two displacement detector coil (La and Lb) is independence separately, and the high-frequency signal source (Sc) that compensating coil (L1, L2, L3 and L4) is connected also is high-frequency signal source independently.
4. the magnetic floating train suspending gap measuring device that compensates slot effect according to claim 1, it is characterized in that: the concrete structure that described probe coil links to each other with signal processing circuit is: each displacement detector coil (La or Lb) links to each other successively with corresponding displacement signal processing unit (A or B), compensation operation unit (Pa or Pb), constitutes one group of independently testing circuit; Compensating coil (L1, L2, L3 and L4) all links to each other with compensating signal processing unit (C) independently, and the output terminal of compensating signal processing unit (C) links to each other with two compensation operation unit (Pa and Pb) simultaneously; The output terminal of two compensation operation unit (Pa and Pb) also all links to each other with the input end of diagnostic signal processing unit (Z).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203521772U CN201589599U (en) | 2009-12-31 | 2009-12-31 | Levitation space measuring apparatus of maglev train capable of compensating cogging effect |
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| CN2009203521772U CN201589599U (en) | 2009-12-31 | 2009-12-31 | Levitation space measuring apparatus of maglev train capable of compensating cogging effect |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105333810A (en) * | 2015-11-03 | 2016-02-17 | 西南交通大学 | Low-speed magnetic suspension train gap sensor in three-probe time sharing detection |
| CN110458785A (en) * | 2019-08-16 | 2019-11-15 | 西南交通大学 | A kind of magnetic levitation ball levitation gap detection method based on image sensing |
| 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 |
| CN110954005A (en) * | 2020-02-21 | 2020-04-03 | 西南交通大学 | Medium-low speed maglev train gap detection method based on image processing |
-
2009
- 2009-12-31 CN CN2009203521772U patent/CN201589599U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105333810A (en) * | 2015-11-03 | 2016-02-17 | 西南交通大学 | Low-speed magnetic suspension train gap sensor in three-probe time sharing detection |
| CN105333810B (en) * | 2015-11-03 | 2018-01-05 | 西南交通大学 | The probe timesharing detection medium-and low-speed maglev train gap sensor of one kind three |
| CN110458785A (en) * | 2019-08-16 | 2019-11-15 | 西南交通大学 | A kind of magnetic levitation ball levitation gap detection method based on image sensing |
| CN110458785B (en) * | 2019-08-16 | 2020-04-28 | 西南交通大学 | Magnetic levitation ball levitation gap detection method based on image sensing |
| 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 |
| CN110525229B (en) * | 2019-10-10 | 2020-11-27 | 中车株洲电力机车有限公司 | Compensation method and compensation system for suspension clearance of medium-low speed maglev train |
| CN110954005A (en) * | 2020-02-21 | 2020-04-03 | 西南交通大学 | Medium-low speed maglev train gap detection method based on image processing |
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Granted publication date: 20100922 Termination date: 20121231 |