CN1210507C - Method for measuring axial displacement of electromagnet bearing rotor - Google Patents
Method for measuring axial displacement of electromagnet bearing rotor Download PDFInfo
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- CN1210507C CN1210507C CN 200310103860 CN200310103860A CN1210507C CN 1210507 C CN1210507 C CN 1210507C CN 200310103860 CN200310103860 CN 200310103860 CN 200310103860 A CN200310103860 A CN 200310103860A CN 1210507 C CN1210507 C CN 1210507C
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- axial displacement
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- electromagnetic bearing
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 18
- 230000011218 segmentation Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000005291 magnetic effect Effects 0.000 description 13
- 238000005259 measurement Methods 0.000 description 5
- 230000005284 excitation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000002001 electrolyte material Substances 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The present invention relates to a method for measuring the axial displacement of an electromagnetic bearing rotor. The present invention is characterized in that a lantern ring is fixed outside a rotor; the lantern ring is composed of at least two kinds of materials which are arranged in a segmenting mode; an axial displacement sensor is arranged in the radial direction of the rotor, the sensing element of the axial displacement sensor is aligned with the juncture of the two materials, and the juncture is used as a measuring basis to measure the axial displacement of the interface following the rotor. In the present invention, the axial displacement sensor which is axially arranged is arranged in the radial direction of the rotor, and realizes the method for measuring the axial displacement of an electromagnetic bearing rotor by using the axial displacement sensor which is axially arranged through the displacement amount of the materials at the juncture of the different materials. The present invention not only can simplify the system structure, but also can simplify system analysis, and brings much convenience to the detection and the control of the electromagnetic bearing rotor. The present invention is particularly suitable for the industrial fields which need to use the electromagnetic bearing to carry out high-speed rotation, no-contact, unlubricated and frictionless support, such as the technical fields of high-speed mechanical processing, turbo machinery and centrifugal machines, aerospace, vacuum and super-clean rooms.
Description
Technical field
The present invention relates to a kind of method of measurement, particularly about a kind of method of measuring electromagnetic bearing rotor axial displacement.
Background technique
Electromagnetic bearing claims magnetic suspension bearing again, its principle is to utilize the effect of magnetic force, make between rotor and the stator and keep certain clearance, rotor suspended make high speed rotating, it is a kind of contactless, unlubricated, frictionless novel bearing, be particularly suitable for high speed rotating and the working environment that can not use lubricant grease, have broad application prospects in various fields such as high speed machine processing, turbomachinery, Aero-Space, vacuum techniques.
Because the general passive passive magnetic bearing of permanent magnet that adopts can't keep the stable of levitated object position on all degrees of freedom, and damping is relatively low; Adopt the passive magnetic bearing of superconduction at present also at the experimental stage, implement the comparison difficulty, and cost is very high.Therefore, active Active Magnetic Bearing (AMB) is most widely used in current industrial.Active Active Magnetic Bearing be utilize the suction between electromagnet and the ferromagnetic material rotor and realize suspending the supporting.
Because active Active Magnetic Bearing is under the constant excitation megnet function of current, when being subjected to certain external disturbance, rotor center can depart from former balance position, rotor with dwindled by amesiality electromagnet gap, and strengthen with the gap of being departed from a side, under the magnetic force of this negative stiffness, will aggravate further departing from of rotor.This is a kind of unstable force structure of similar reversely standing pendulum, can not stable suspersion under the constant excitation megnet function of current, therefore electromagnetic bearing must be under the effect of controller, the positional offset amount signal that records by rotor-position sensor is in time regulated the electric current on the respective electrical magnet, rotor is controlled the position of getting back to geometrical center again, could proper functioning.Thereby, the detection of rotor axial displacement and radial displacement is just become the basis of controlling whole active magnetic bearing system.
Traditional electromagnetic bearing (as shown in Figure 1) often adopts eddy current displacement sensor 11,12 that its radial displacement and axial displacement are measured.And in general, shaft position sensor 11 adopts and axially places, and radial displacement transducer 12 adopts radially to be placed.So will cause a comparatively complicated structure, the detection and the control of rotor 1 are made troubles.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide a kind of method of measuring electromagnetic bearing rotor axial displacement.
For achieving the above object, the present invention takes following technological scheme: a kind of method of measuring electromagnetic bearing rotor axial displacement, it is characterized in that: at rotor fixed outside one collar, the described collar is made up of two kinds of materials that segmentation is provided with at least, shaft position sensor is placed on described rotor radially, and the sensing element of described shaft position sensor aimed at the intersection of described two kinds of materials, and with this interface as measuring basis, measure of the axial displacement of this interface with rotor.
Described shaft position sensor is two groups that axially are provided with, and every group of two radial symmetric settings by the processing to described four sensor output signals, finally obtain and the linear signal of described rotor axial displacement.
The present invention is owing to take above method, it has the following advantages: 1, the present invention is because the shaft position sensor that will axially place usually is placed on rotor radially, displacement amount by different materials intersection material, realized method with the sensor measurement electromagnetic bearing rotor axial displacement of radially placing, it not only can simplied system structure, and can simplify analysis to system, bring suitable facility for the detection and the control of electromagnetic bearing rotor.2, the present invention is owing to take two pairs of four shaft position sensors, and with the output of these four sensors through certain processing, therefore not only can eliminate the influence of radial displacement to measurement result, can also increase the slope of output signal, improve sensitivity.The inventive method implementation step is simple, test result is accurate, be particularly suitable for need using electromagnetic bearing and carry out high speed rotating, contactless, unlubricated, the industrial field that do not have the friction supporting, for example high speed machine processing, turbomachinery and centrifuge, Aero-Space, vacuum and clean room technical field.
Description of drawings
Sensor was provided with schematic representation when Fig. 1 was traditional electrical magnetic bearing rotor measurement
Axial sensor was provided with schematic representation when Fig. 2 was an electromagnetic bearing measurement device of the present invention
Embodiment
As shown in Figure 2, the inventive method is fixed outside one collar 2 at rotor 1, the collar 2 is based on a kind of material 21, be arranged at intervals with two sections another kind of materials 22 thereon, four shaft position sensors 31,32,33,34 are placed on rotor 1 radially, and the sensing element of four shaft position sensors 31,32,33,34 are aimed at the intersection of two kinds of materials 21,22 respectively.So, the magnetic circuit of shaft position sensor 3 mainly is made up of sensor sensing element magnetic circuit, the rotor collar 2 and air gap.The output of sensor 3 is subjected to the factor affecting such as distance between the collar 2 material electric conductivity permeabilities, sensor excitation frequency, sensor and the collar 2, under energizing frequency and the constant condition of distance, rotor 1 axial displacement influences the magnetic circuit distribution of material, be equivalent to change the conductivity of electrolyte materials permeability, thereby influence the output of shaft position sensor 3.
In the foregoing description, the composition of two kinds of materials of the collar 2 can be taked various forms, and such as welding, inlay etc., compound material also can be more than three kinds or three kinds, but general two kinds of materials just can be realized goal of the invention.
In the foregoing description, because in four shaft position sensors 31,32,33,34 that are oppositely arranged, sensor 31,32 is positioned at same vertical plane, sensor 33,34 is positioned at same vertical plane; Sensor 31,33 is positioned at same horizontal plane, and sensor 32,34 is positioned at same horizontal plane.When rotor departed from the equilibrium position, each sensor 31,32,33,34 output voltage was: (the axial and radial displacement of supposing sensor is respectively z and x)
U
31＝U
0+DU(z，x)
U
32＝U
0+DU(z，-x)
U
33＝U
0+DU(-z，x)
U
34＝U
0+DU(-z，-x)
U wherein
0Output voltage when being positioned at the equilibrium position for rotor, (z x) departs from the variable quantity (being the function of axial displacement z and radial displacement x) of equilibrium position output voltage to DU for rotor
In the working sensor scope, DU (z, x) linear with z and x, be in the same place so adopt two adders respectively the output signal of sensor 31,32 and sensor 33,34 to be added, again these two are added and signal input subtractor, can obtain final being output as:
U＝(U
1+U
2)-(U
3+U
4)
＝(2U
0+K(z))-(2U
0+K(-z))
＝2K(z)＝nz
So just obtained the output signal that is directly proportional with rotor axial displacement z, n is a characteristic slope.That is to say that the present invention passes through the respective handling to sensor 31,32,33,34 output signals, obtained and the linear signal of rotor 1 axial displacement, as for how rotor to be controlled the problem of getting back to geometrical center according to this signal, belong to prior art, do not repeat them here.
Claims (2)
1, a kind of method of measuring electromagnetic bearing rotor axial displacement, it is characterized in that: at rotor fixed outside one collar, the described collar is made up of two kinds of materials that segmentation is provided with at least, shaft position sensor is placed on described rotor radially, and the sensing element of described shaft position sensor is aimed at the intersection of described two kinds of materials, and as measuring basis, measure of the axial displacement of this interface with rotor with this interface.
2, a kind of method of measuring electromagnetic bearing rotor axial displacement as claimed in claim 1, it is characterized in that: described shaft position sensor is axial two groups of being provided with, every group of two radial symmetric settings, by processing, finally obtain and the linear signal of described rotor axial displacement described four sensor output signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310103860 CN1210507C (en) | 2003-11-14 | 2003-11-14 | Method for measuring axial displacement of electromagnet bearing rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310103860 CN1210507C (en) | 2003-11-14 | 2003-11-14 | Method for measuring axial displacement of electromagnet bearing rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1544878A CN1544878A (en) | 2004-11-10 |
| CN1210507C true CN1210507C (en) | 2005-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310103860 Expired - Fee Related CN1210507C (en) | 2003-11-14 | 2003-11-14 | Method for measuring axial displacement of electromagnet bearing rotor |
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| Country | Link |
|---|---|
| CN (1) | CN1210507C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101326378B (en) * | 2005-12-09 | 2011-01-19 | Ntn株式会社 | Motor integrated magnetic bearing device |
| CN101765719B (en) * | 2007-08-16 | 2012-11-14 | 江森自控科技公司 | Method of positioning seals in turbomachinery utilizing electromagnetic bearings |
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| FR2935478B1 (en) * | 2008-08-28 | 2010-09-10 | Roulements Soc Nouvelle | SYSTEM AND METHOD FOR MEASURING THE AXIAL MOTION OF A ROTATING MOBILE WORKPIECE |
| FR2935485B1 (en) * | 2008-08-28 | 2010-09-10 | Roulements Soc Nouvelle | SYSTEM AND METHOD FOR MEASURING THE AXIAL MOTION OF A ROTATING MOBILE WORKPIECE |
| KR101158812B1 (en) * | 2010-03-02 | 2012-06-26 | 주식회사 디엔엠 테크놀로지 | Displacement sensor and magnetic bearing system using the same |
| DE102011051885A1 (en) * | 2011-07-15 | 2013-01-17 | Atlas Copco Energas Gmbh | turbomachinery |
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| CN109470192A (en) * | 2018-12-18 | 2019-03-15 | 南京磁谷科技有限公司 | A kind of mounting structure of electromagnetic bearing axial sensor |
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-
2003
- 2003-11-14 CN CN 200310103860 patent/CN1210507C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101326378B (en) * | 2005-12-09 | 2011-01-19 | Ntn株式会社 | Motor integrated magnetic bearing device |
| CN101765719B (en) * | 2007-08-16 | 2012-11-14 | 江森自控科技公司 | Method of positioning seals in turbomachinery utilizing electromagnetic bearings |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1544878A (en) | 2004-11-10 |
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