CN202229773U - Device for detecting suspended matter position in magnetic suspension device - Google Patents
Device for detecting suspended matter position in magnetic suspension device Download PDFInfo
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- CN202229773U CN202229773U CN2011203679016U CN201120367901U CN202229773U CN 202229773 U CN202229773 U CN 202229773U CN 2011203679016 U CN2011203679016 U CN 2011203679016U CN 201120367901 U CN201120367901 U CN 201120367901U CN 202229773 U CN202229773 U CN 202229773U
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Abstract
A device for detecting suspended matter position in a magnetic suspension device is provided. The device comprises senor groups, the number of which is corresponding with controllable horizontal directions of suspended matters in the suspension device; and a processing unit. Each sensor group comprises two sensors which are arranged along the same horizontal direction and are symmetrical about a center of the suspension device, each sensor is correspondingly used for detecting intensity of a magnetic field generated by an electromagnet which is used for controlling the horizontal mobile directions of the suspension matters, and intensity of a magnetic field generated by the suspended matters. The processing unit is used for judging positions of the suspended matters according to an offset difference which is obtained by subtracting detection values of the two sensors of the same group. The device is simple and compact in structure, low in costs, and stable and reliable in work, the influence of external superposed magnetic fields can be eliminated, and detection precision and control precision can be increased.
Description
Technical field
The utility model is mainly concerned with the magnetic levitation system field, refers in particular to a kind of being applicable in the magnetic levitation system pick-up unit is carried out in the suspension position.
Background technology
Magnetic levitation system can be divided into electromagnetic attraction type levitation device and permanent magnet expulsive force type levitation device on suspension theory.Electromagnetic attraction type levitation device attracts the ferromagnetism suspension through controlled electromagnet, makes it contactlessly to be suspended in aerial.Permanent magnet expulsive force type levitation device is equipped with the opposite permanent magnet of magnetic respectively on base and suspension, utilize the principle of permanent magnet " same sex is repelled each other " to realize suspending.In above-mentioned two types magnetic levitation system, all need accurately know the position of suspension.For this reason, adopt position transducer to measure usually, like current vortex sensor, photoelectric sensor, Hall element etc.
In permanent magnet expulsive force type levitation device, because suspension contains permanent magnet, therefore use Hall element to judge its position through the changes of magnetic field of measuring the suspension magnet generation, be the simplest directly method, it is by extensively employing.But, owing to be used to realize that the electromagnet of Suspension Control can produce variable electromagnetic field in this device, this magnetic field can with the magnetic field superposition of suspending permanent magnet, and then interference position measures, and makes the accuracy and the consistance decline of measuring, and badly influences the stability of suspension.
In order to address the above problem, the normal method for processing signals that adopts promptly through detecting the exciting current of electromagnet, draws the estimated value that it excites the intensity in magnetic field in the prior art; In the detected value of sensor, deduct above-mentioned estimated value then, obtain true value.This method has obtained widespread use in large scale system, and respond well.But the accuracy of this method depends critically upon algorithm for estimating, and therefore the modeling accuracy to system requires very high; In addition, owing to will detect electric current, needing increases extra sensor, so system complex, is difficult to use in the occasion to space and cost sensitivity.
The utility model content
The technical matters that the utility model will solve just is: to the technical matters that prior art exists, the utility model provide a kind of simple and compact for structure, with low cost, working stability reliable, can eliminate outside stack magnetic field influence, improve suspension position Detection device in the magnetic levitation system of accuracy of detection and control accuracy.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
Suspension position Detection device in a kind of magnetic levitation system; Comprise with levitation device in the controlled horizontal direction quantity of suspension corresponding sensor group and processing unit; Said each sensor groups comprises along same horizontal direction arranges and with two sensors of the center symmetric arrangement of levitation device; Said each sensor is corresponding to be detected one and is used for controlling the intensity in the magnetic field that electromagnet that suspension moves horizontally direction produces and the intensity in the magnetic field that suspension produces, and said processing unit is judged the position that obtains suspension according to the difference that the detected value of two sensors on the same group subtracts each other after obtaining offseting.
Further improvement as the utility model pick-up unit:
Said processing unit is one to offset treatment circuit.
The said treatment circuit that offsets comprises difference arithmetic unit that links to each other with two sensors and the proportional amplifier that links to each other with the difference arithmetic unit output terminal.
Said sensor groups is that two and orthogonal thereto mode are arranged.
Compared with prior art, the advantage of the utility model is: the utility model is simple in structure, with low cost, be easy to realize, reliability is high; Through symmetric arrangement sensor spatially; Just can eliminate the field strong component (interference components) in electromagnet magnetic field, and keep the field strong component (active constituent) of permanent magnet field, thereby eliminate the influence in outside stack magnetic field; Solved the problem that external magnetic field is disturbed; The robustness of measuring is good, position detection accuracy is high, and then has improved the control accuracy of magnetic levitation system, and whole device more stable work is reliable.
Description of drawings
Fig. 1 is the structural representation of magnetic levitation system in the concrete application example.
Fig. 2 is the structural representation of the utility model in concrete application example.
Fig. 3 is the layout synoptic diagram of electromagnet.
Fig. 4 is the layout synoptic diagram of sensor.
Fig. 5 is the synoptic diagram of sensor and electromagnet positioned opposite position.
Fig. 6 is the analysis synoptic diagram that detects principle in the utility model instantiation.
Fig. 7 is the circuit diagram of processing unit in the utility model instantiation.
Marginal data:
1, suspension; 2, suspension base; 301, annular permanent magnet; 311, first electromagnet; 312, second electromagnet; 313, the 3rd electromagnet; 314, the 4th electromagnet; 401, first sensor; 402, second sensor; 403, the 3rd sensor; 404, four-sensor.
Embodiment
Below will combine Figure of description and specific embodiment that the utility model is explained further details.
The utility model is mainly used in the magnetic levitation system as shown in Figure 1; Wherein magnetic levitation system generally is made up of suspension 1 and suspension base 2 two parts; The shell that suspension 1 comprises permanent magnet and is wrapped in the permanent magnet outside, 2 of suspension bases comprise cartridge assemblies, circuit board and shell.
In the present embodiment; As shown in Figures 2 and 3; Cartridge assemblies comprises the pick-up unit of annular permanent magnet 301, first electromagnet 311, second electromagnet 312, the 3rd electromagnet 313, the 4th electromagnet 314 and the utility model; Four electromagnet are positioned at the ring of annular permanent magnet 301, and are distributed on the identical circumference.First electromagnet 311 and the 3rd electromagnet 313 are one group, and second electromagnet 312 and the 4th electromagnet 314 are one group, and every group of electromagnet is used for controlling suspension 1 moving a horizontal direction.The line of centres of two groups of electromagnet is 90 degree, promptly orthogonal thereto layout.
Suspension position Detection method in the utility model magnetic levitation system; Each controlled moving horizontally of suspension a sensor groups is set on the direction exactly; Sensor groups comprises that the center with levitation device is two sensors of symmetric arrangement, and one of the corresponding detection of each sensor is used for controlling electromagnet field intensity and the suspension field intensity that suspension moves horizontally direction; The detected value of two sensors in is on the same group subtracted each other the difference after obtaining offseting, judge the position that obtains suspension according to said difference.
Like Fig. 2, Fig. 4 and shown in Figure 5; Suspension position Detection device in the utility model magnetic levitation system; It comprises with levitation device in the controlled horizontal direction quantity of suspension corresponding sensor group and processing unit; Each sensor groups comprises along same horizontal direction arranges and with two sensors of the center symmetric arrangement of levitation device; Each sensor is corresponding to be detected one and is used for controlling the intensity in the magnetic field that electromagnet that suspension moves horizontally direction produces and the intensity in the magnetic field that suspension produces, and the field strong component (interference components) in the electromagnet magnetic field that comprises in two of every group of sensor measurement results like this equates, the field strong component (active constituent) of permanent magnet field is equivalent reverse.Processing unit is judged the position that obtains suspension according to the difference that the detected value of two sensors on the same group subtracts each other after obtaining offseting.The method that the utility model adopts dual sensor to offset realizes; Be that every pair of signal is handled with circuit kit; Through two signals are done subtraction, just can eliminate the field strong component (interference components) in electromagnet magnetic field, and keep the field strong component (active constituent) of permanent magnet field; Thereby eliminate the influence in outside stack magnetic field, solved the problem that external magnetic field is disturbed dexterously.
As shown in Figure 4; Comprise the two sensors group in the present embodiment; Be first sensor 401 and the 3rd sensor 403, second sensor 402 and the four-sensor 404, sensor all can adopt Hall element, and it is responsible for converting field strength values to be measured into current signal.The orthogonal thereto mode of sensor groups is arranged.Promptly; First sensor 401 and the 3rd sensor 403 are arranged on the horizontal direction of first electromagnet 311 and the 3rd electromagnet 313 line BB ', and second sensor 402 and four-sensor 404 are arranged on the horizontal direction of second electromagnet 312 and the 4th electromagnet 314 line AA '.First sensor 401 and the 3rd sensor 403 are used for detecting suspension moving horizontally on AA ' direction, and second sensor 402 and four-sensor 404 are used for detecting suspension moving horizontally on BB ' direction.The measuring principle of this both direction is identical, is example with AA ' direction below, describes the detection method of the utility model in detail.
Referring to Fig. 6, suppose that the electric current that passes through on first electromagnet 311 and the 3rd electromagnet 313 windings is I when suspension 1 during in position as shown in the figure.The magnetic direction that then permanent magnet excites in the suspension 1 is P, and the magnetic direction that electromagnet excites is Q.First sensor 401, the 3rd sensor 403 are with the field intensity of measuring these two magnetic fields simultaneously, that is:
The 3rd sensor 403 is output as: U403=Up2+Uq2 (2)
Wherein: the distance of the size of Up1 and Up2 and suspension 1 misalignment center sensor is proportional.Therefore:
Up1?=?k1?*?x1 (3)
Up2?=?k2?*?x2 (4)
Because two sensor characteristic are identical, therefore can remember:
k1?=?k2?=?k (5)
Wherein k is a constant coefficient, and its position with transducer arrangements is relevant.
According to the symmetry of position, the distance that suspension 1 leaves the center (sensor module center) of levitation device in the horizontal direction is x, and x is the utility model detection method unknown quantity to be determined, the just position of suspension.First electromagnet 311 and the 3rd electromagnet 313 centre distances are D, then have:
x1?=?(D/2)?+?x (6)
x2?=?(D/2)?-?x (7)
(5)～(7) substitutions (3)～(4) can be got:
Up1?=?k?*?(D/2)?+?k?*?x (8)
Up2?=?k?*?(D/2)?-?k?*?x (9)
Consider Uq1 and Uq2 again.Because electromagnet excites magnetic field on the direction perpendicular to sensor surface, to be approximately uniform magnetic field, therefore can be designated as:
Uq1?=?Uq2?=?Uq (10)
(8)～(10) substitutions (1)～(2) can be got:
U401?=?k?*?(D/2)?+?k?*?x?+?Uq (11)
U403?=?k?*?(D/2)?-?k?*?x?+?Uq (12)
Deducting formula (12) with formula (11) can get:
U401-U403?=?2?*?k?*?x (*)
In other words, only need the output valve of first sensor 401 and the 3rd sensor 403 is subtracted each other, can obtain a signal that is directly proportional with suspension 1 position x.Can detect the position of suspension 1 in view of the above.
Referring to Fig. 7, in the present embodiment, processing unit is one to offset treatment circuit.Offset treatment circuit and comprise difference arithmetic unit (amplifier U1) that links to each other with two sensors and the proportional amplifier (amplifier U2) that links to each other with the difference arithmetic unit output terminal; Difference arithmetic unit can be realized the subtraction process to the two-way input signal, and proportional amplifier can amplify input signal.After the U1 processing, can obtain (*) formula desired position detection signal, but this signal is very faint.Therefore utilize U2 that it is amplified, so that subsequent conditioning circuit is handled.
Below only be the preferred implementation of the utility model, the protection domain of the utility model also not only is confined to the foregoing description, and all technical schemes that belongs under the utility model thinking all belong to the protection domain of the utility model.Should be pointed out that for those skilled in the art,, should be regarded as the protection domain of the utility model in the some improvement and the retouching that do not break away under the utility model principle prerequisite.
Claims (4)
1. suspension position Detection device in the magnetic levitation system; It is characterized in that: comprise with levitation device in the controlled horizontal direction quantity of suspension corresponding sensor group and processing unit; Said each sensor groups comprises along same horizontal direction arranges and with two sensors of the center symmetric arrangement of levitation device; Said each sensor is corresponding to be detected one and is used for controlling the intensity in the magnetic field that electromagnet that suspension moves horizontally direction produces and the intensity in the magnetic field that suspension produces, and said processing unit is judged the position that obtains suspension according to the difference that the detected value of two sensors on the same group subtracts each other after obtaining offseting.
2. suspension position Detection device in the magnetic levitation system according to claim 1 is characterized in that: said processing unit is one to offset treatment circuit.
3. suspension position Detection device in the magnetic levitation system according to claim 2 is characterized in that: the said treatment circuit that offsets comprises difference arithmetic unit that links to each other with two sensors and the proportional amplifier that links to each other with the difference arithmetic unit output terminal.
4. according to suspension position Detection device in claim 1 or the 2 or 3 described magnetic levitation systems, it is characterized in that: said sensor groups is that two and orthogonal thereto mode are arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203679016U CN202229773U (en) | 2011-09-29 | 2011-09-29 | Device for detecting suspended matter position in magnetic suspension device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203679016U CN202229773U (en) | 2011-09-29 | 2011-09-29 | Device for detecting suspended matter position in magnetic suspension device |
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| CN202229773U true CN202229773U (en) | 2012-05-23 |
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| CN2011203679016U Expired - Fee Related CN202229773U (en) | 2011-09-29 | 2011-09-29 | Device for detecting suspended matter position in magnetic suspension device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445220A (en) * | 2011-09-29 | 2012-05-09 | 中磁力（深圳）科技有限公司 | Method and device for detecting position of suspended substance in magnetic suspension device |
| CN105187774A (en) * | 2015-07-31 | 2015-12-23 | 广州杰赛科技股份有限公司 | Environment detection device and detection system |
| CN108195276A (en) * | 2018-03-13 | 2018-06-22 | 吉林大学 | The check device and method of air spring wire loop position |
-
2011
- 2011-09-29 CN CN2011203679016U patent/CN202229773U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445220A (en) * | 2011-09-29 | 2012-05-09 | 中磁力（深圳）科技有限公司 | Method and device for detecting position of suspended substance in magnetic suspension device |
| CN105187774A (en) * | 2015-07-31 | 2015-12-23 | 广州杰赛科技股份有限公司 | Environment detection device and detection system |
| CN105187774B (en) * | 2015-07-31 | 2019-04-30 | 广州杰赛科技股份有限公司 | A kind of environment arrangement for detecting and detecting system |
| CN108195276A (en) * | 2018-03-13 | 2018-06-22 | 吉林大学 | The check device and method of air spring wire loop position |
| CN108195276B (en) * | 2018-03-13 | 2023-04-07 | 吉林大学 | Device and method for checking position of air spring steel wire ring |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20170929 |