CN101483399A - Ultra-magnetic telescopic driver special for oil membrane bearing - Google Patents
Ultra-magnetic telescopic driver special for oil membrane bearing Download PDFInfo
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- CN101483399A CN101483399A CNA200910046497XA CN200910046497A CN101483399A CN 101483399 A CN101483399 A CN 101483399A CN A200910046497X A CNA200910046497X A CN A200910046497XA CN 200910046497 A CN200910046497 A CN 200910046497A CN 101483399 A CN101483399 A CN 101483399A
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- loam cake
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Abstract
The present invention relates to a film bearing exclusive use giant magnetostrictive driver which comprises a magnetic base plate, a magnetic outer housing, a giant magnetostrictive rod, a coil framework, a exciter coil, a bias coil, a magnetic cover gasket, a upper cover, fastening screws and supporting block. The invention comprises the following steps: measure bearing film gapping place by using current vortex displacement sensor, adjust driver output displacement by adjusting power supply current of driver to realize static state and dynamic adjustment of film gapping place and reach target of enhancing rotate precision and stability of film bearing.
Description
Technical field
The present invention relates to a kind of ultra-magnetic telescopic driver special for oil membrane bearing (Giant Magnetostrictive Actuators, GMA).
Background technology
Traditional oils film bearing bearing capacity is good, the life-span is long, be widely used in industries such as metallurgy, electric power, mine, chemical industry and machinery, but its running accuracy is low, stability is not high, and its Application for Field in some high-precision requirement is restricted.At this problem that the traditional oils film bearing exists, document [1-2] has proposed controlled squeeze film bearing, as Fig. 1.Its operation principle is mobile vertically by the pressure differential promotion oil film outer shroud of high-low pressure oil pocket generation, changes the dynamic characteristic that bearing film gap and effective loaded length are improved bearing.Although controlled squeeze film bearing has tangible effectiveness in vibration suppression, its degree of regulation is not high, and response speed is subjected to also that regulation of hydraulic system is slow-footed to be influenced, and response speed is slow.
(Giant Magnetostrictive Material GMM), is a class binary rare-earth alloy material to giant magnetostrictive material, and very big magnetostriction coefficient is arranged under room temperature and downfield.Find that through our Primary Study GMM has advantages such as fast, the flexible dependent variable of response speed is big, dynamic response is wide, the driver of application GMM exploitation can be realized the displacement output with the same order of magnitude of oil film thickness, is fit to very much the clearance control of filmatic bearing.
Summary of the invention
The objective of the invention is to use the GMM exploitation provides a kind of ultra-magnetic telescopic driver special for oil membrane bearing, is used for transforming the traditional oils film bearing, realizes that oil clearance is adjustable, thereby improves the running accuracy and the stability of filmatic bearing.
For achieving the above object, design of the present invention is: because under magnetic field environment, the stroke of super-magnetostrictive drive (GMA) is monotonic relationshi with the intensity in magnetic field, and magnetic field intensity coil geometry, the number of turn, the line footpath, by the factors such as size of current of coil relevant outer with being wrapped in GMM.Record oil clearance by eddy current displacement sensor, regulate the stroke of GMA by changing input current then, thereby regulate oil clearance.
According to above-mentioned design, the present invention adopts following technical proposals:
A kind of ultra-magnetic telescopic driver special for oil membrane bearing comprises base, shell and loam cake.It is characterized in that described base is the magnetic conduction base, described shell is a magnetic conductive shell, and described loam cake is magnetic conduction loam cake not; A giant magnetostrictive rod is settled in described shell inner cavity center, and its lower end is supported on the base, and the upper end closely contacts a magnetic conduction seal cover; Settle a non-magnetic bobbin in the annular chamber that forms between described shell, base, giant magnetostrictive rod and the magnetic conduction seal cover, on described bobbin, twining coil; Tighten to connect airtight at described magnetic conduction seal cover and touch a rest pad, the centre bore allotment of described rest pad and described loam cake is also stretched out from centre bore; Described loam cake by stud nut make itself and shell and and base be tightened to one; The gap of remaining valid between described magnetic conduction seal cover end face and the loam cake inner bottom surface.
Above-mentioned coil is made up of inside and outside two coils, and its interior loop is an excitation coil, realizes the dynamic adjustments of super-magnetostrictive drive, and exterior loop is a bias coil, realizes that the static state of super-magnetostrictive drive is regulated.
The number of turn of above-mentioned bias coil is greater than the number of turn of described excitation coil; The bias coil number of turn the more, static adjustable range is bigger; The excitation coil number of turn is fewer, and the dynamic response of super-magnetostrictive drive better.
Above-mentioned giant magnetostrictive rod is the rod that giant magnetostrictive material is made, and described giant magnetostrictive material is a kind ofly to be Terfenol-D rare-earth alloy material.
The present invention has following conspicuous substantive distinguishing features and advantage compared with prior art:
(1), coil design is reasonable, can make the static adjustable range broad and easy to adjust of GMA, dynamic response is good.In order to regulate the equipoise at filmatic bearing center, the static output of GMA displacement must be adjustable.The design bias coil, regulate magnetic field just by regulating the bias coil electric current, thereby regulated the static state output displacement of GMA easily, so just realized the adjustable purpose in equipoise, filmatic bearing center, and under the condition that the GMA structure allows, the bias coil number of turn is many more, helps increasing the static adjustable range of GMA more.When dynamic adjustments, produce bias magnetic field behind the bias coil input current, help eliminating the frequency multiplication phenomenon of GMM.
The GMA of special use in the filmatic bearing needs the vibration of Synchronization Control rotor, also must have the good dynamic response characteristic, promptly requires response time weak point, inductance and impedance little.Inductance and impedance all with square be directly proportional [3] of solenoidal dynamic adjustments (excitation) coil turn.Reduce the number of turn of dynamic adjustments coil so, just can significantly reduce the inductance and the impedance of coil.Like this, the static adjusting and the just impossible shared one group of coil of dynamic adjustments designed the dynamic exciting coil in addition.
Therefore, the GMA of special use in the filmatic bearing, its magnetic field should be provided by two coils, and bias coil provides biasing magnetic field just, and the number of turn is many, and static adjustable range is big, and the number of turn of dynamic adjustments coil is few as far as possible, and the dynamic response of GMA is good.
(2), GMA does not need special cooling system.Generally speaking, during GMA solenoid (comprising drive coil and bias coil) energising work the heating phenomenon is arranged, the influence of GMM significantly be can not ignore.But the GMA that uses on the ACTIVE CONTROL filmatic bearing, when static state was regulated, because temperature rise has caused the increase of GMA output displacement, this had widened the static carry-out bit transposition adjusting range of GMA on the contrary.When dynamic adjustments, take place for avoiding the frequency multiplication phenomenon, need to apply bias current to GMA in advance.The dynamic adjustments electric current is compared less with bias current, very little to the influence of GMM thermal deformation for reaching the influence of thermally equilibrated temperature field not quite, can ignore; Simultaneously, GMA is immersed in the lubricating oil, along with circulating of lubricating oil, the part heat that GMA produces is taken away.Therefore, be applied in the GMA on the ACTIVE CONTROL filmatic bearing, do not need special cooling system.
(3), do not need special prestressing force charger, compact conformation, simple.When being applied in the filmatic bearing, can apply prestressing force in conjunction with the back-up block among the GMA to GMM, not need special prestressing force charger with the original structure of filmatic bearing.
Description of drawings
Fig. 1 is the controlled squeeze film bearing structural representation of prior art.
Fig. 2 is the structural representation of one embodiment of the invention.
Fig. 3 is a solenoid geometrical form among Fig. 2.
Fig. 4 is the special-purpose GMA static properties of a filmatic bearing test curve
Fig. 5 is the special-purpose GMA dynamic performance testing of a filmatic bearing curve
Embodiment
Details are as follows in conjunction with the accompanying drawings for a preferred embodiment of the present invention:
Referring to Fig. 2, this ultra-magnetic telescopic driver special for oil membrane bearing comprises base 10, shell 2 and loam cake 6.It is characterized in that described base 10 is the magnetic conduction base, described shell 2 is a magnetic conductive shell, and described loam cake 6 is magnetic conduction loam cake not; Described shell 2 lumen centers places settle a giant magnetostrictive rod 9, and its lower end is supported on the base 10, and the upper end closely contacts a magnetic conduction seal cover 4; Settle a non-magnetic bobbin 7 in the annular chamber that forms between described shell 2, base 10, giant magnetostrictive rod 9 and the magnetic conduction seal cover 4, on described bobbin 7, twining coil; Tighten to connect airtight at described magnetic conduction seal cover 4 and touch a rest pad 5, described rest pad 5 stretches out with the centre bore allotment of described loam cake 6 and from centre bore; Described loam cake 6 by stud nut 1 make itself and shell 2 and and base 10 be tightened to one; The gap of remaining valid between described magnetic conduction seal cover 4 end faces and loam cake 6 inner bottom surfaces.
Above-mentioned coil is made up of inside and outside two coils, and its interior loop is an excitation coil 8, realizes the dynamic adjustments of super-magnetostrictive drive, and exterior loop is a bias coil 3, realizes that the static state of super-magnetostrictive drive is regulated.
The number of turn of above-mentioned bias coil is greater than the number of turn of described excitation coil 8; Bias coil 3 numbers of turn the more, static adjustable range is bigger; Excitation coil 8 numbers of turn are fewer, and the dynamic response of super-magnetostrictive drive better.
Above-mentioned giant magnetostrictive rod is the rod that giant magnetostrictive material is made, and described giant magnetostrictive material is a kind ofly to be Terfenol-D rare-earth alloy material.
Further specify below:
Because the specification limits of existing GMM rod, we have implemented solenoid (loop geometries) design around the GMM rod, and the winding wire footpath is preferred, calculating such as whole magnetic circuit optimization.A preferred embodiment of the present invention is: referring to Fig. 3.The GMM rod is of a size of: l
m=30mm, r
m=5mm; Coil is of a size of: r
1=7mm, r
2=20mm, l
c=40mm; The number of turn N of bias coil
2=1300, resistance is 11 Ω, the number of turn N of excitation coil
1=300, resistance is that the inductance of 1.8 Ω, excitation coil is 5.7mH.
Fig. 4 is illustrated under the different prestressing force, the electric current and the GMA stroke relation curve of different sizes, the i.e. special-purpose GMA static properties of filmatic bearing test curve.
Fig. 5 is illustrated under the different prestressing force, the electric current of different frequency and GMA stroke relation curve (with the power output curve representation), the i.e. special-purpose GMA dynamic performance testing of filmatic bearing curve.
The static properties test curve of GMA has verified that the GMA that is developed is under the effect in normality magnetic field, can produce with the oil clearance of filmatic bearing and export in the displacement of the same order of magnitude, from figure, it can also be seen that, if prestressing force is selected reasonably words, input current and GMA output displacement are almost linear.The dynamic performance testing curve of GMA shows that again GMA has good dynamic response under the alternating current effect of multiple frequency, and this can satisfy the required driving frequency of filmatic bearing vibration damping.In sum, the special-purpose GMA of filmatic bearing can be used for controlling the gap of filmatic bearing as driver, suppresses the vibration of filmatic bearing rotor, thereby improves filmatic bearing running accuracy and stability.
Claims (4)
1. a ultra-magnetic telescopic driver special for oil membrane bearing comprises base (10), shell (2) and loam cake (6).It is characterized in that described base (10) is the magnetic conduction base, described shell (2) is a magnetic conductive shell, and described loam cake (6) is magnetic conduction loam cake not; Described shell (2) lumen centers place settles a giant magnetostrictive rod (9), and its lower end is supported on the base (10), and the upper end closely contacts a magnetic conduction seal cover (4); Settle a non-magnetic bobbin (7) in the annular chamber that forms between described shell (2), base (10), giant magnetostrictive rod (9) and the magnetic conduction seal cover (4), on described bobbin (7), twining coil; Tighten to connect airtight at described magnetic conduction seal cover (4) and touch a rest pad (5), described rest pad (5) stretches out with the centre bore allotment of described loam cake (6) and from centre bore; Described loam cake (6) by stud nut (1) make itself and shell (2) and and base (10) be tightened to one; The gap of remaining valid between described magnetic conduction seal cover (4) end face and loam cake (6) inner bottom surface.
2. ultra-magnetic telescopic driver special for oil membrane bearing according to claim 1, it is characterized in that described coil is made up of inside and outside two coils, its interior loop is excitation coil (8), realize the dynamic adjustments of super-magnetostrictive drive, exterior loop is bias coil (3), realizes that the static state of super-magnetostrictive drive is regulated.
3. ultra-magnetic telescopic driver special for oil membrane bearing according to claim 2 is characterized in that the number of turn of the number of turn of described bias coil (3) greater than described excitation coil (8); Bias coil (3) number of turn the more, static adjustable range is bigger; Excitation coil (8) number of turn is fewer, and the dynamic response of super-magnetostrictive drive better.
4. ultra-magnetic telescopic driver special for oil membrane bearing according to claim 1 is characterized in that the rod that described giant magnetostrictive rod (9) is made for giant magnetostrictive material, and described giant magnetostrictive material is a kind ofly to be Terfenol-D rare-earth alloy material.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200910046497XA CN101483399A (en) | 2009-02-24 | 2009-02-24 | Ultra-magnetic telescopic driver special for oil membrane bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200910046497XA CN101483399A (en) | 2009-02-24 | 2009-02-24 | Ultra-magnetic telescopic driver special for oil membrane bearing |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797667A (en) * | 2012-09-01 | 2012-11-28 | 安徽理工大学 | Micro-pump based on super-magnetostrictive film driver |
| CN102969934A (en) * | 2012-11-07 | 2013-03-13 | 上海交通大学 | Micro thread linear motor based on magnetostrictive effect |
| CN103207311A (en) * | 2013-03-21 | 2013-07-17 | 哈尔滨工业大学 | Magnetostriction current sensor for power system |
| CN106248182A (en) * | 2016-09-18 | 2016-12-21 | 南京航空航天大学 | A kind of weighing device based on giant magnetostrictive material and method |
| CN111431435A (en) * | 2020-05-24 | 2020-07-17 | 吉林大学 | Double-excitation three-output magnetic drive precise rotating device and driving method thereof |
| CN113417939A (en) * | 2021-05-14 | 2021-09-21 | 重庆科技学院 | Water-lubricated rubber alloy bearing of shaftless rim propeller and optimal lubrication gap adjusting method |
-
2009
- 2009-02-24 CN CNA200910046497XA patent/CN101483399A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797667A (en) * | 2012-09-01 | 2012-11-28 | 安徽理工大学 | Micro-pump based on super-magnetostrictive film driver |
| CN102969934A (en) * | 2012-11-07 | 2013-03-13 | 上海交通大学 | Micro thread linear motor based on magnetostrictive effect |
| CN102969934B (en) * | 2012-11-07 | 2015-05-20 | 上海交通大学 | Micro thread linear motor based on magnetostrictive effect |
| CN103207311A (en) * | 2013-03-21 | 2013-07-17 | 哈尔滨工业大学 | Magnetostriction current sensor for power system |
| CN106248182A (en) * | 2016-09-18 | 2016-12-21 | 南京航空航天大学 | A kind of weighing device based on giant magnetostrictive material and method |
| CN111431435A (en) * | 2020-05-24 | 2020-07-17 | 吉林大学 | Double-excitation three-output magnetic drive precise rotating device and driving method thereof |
| CN111431435B (en) * | 2020-05-24 | 2024-04-09 | 吉林大学 | Dual-excitation three-output magnetically-driven precise rotating device and driving method thereof |
| CN113417939A (en) * | 2021-05-14 | 2021-09-21 | 重庆科技学院 | Water-lubricated rubber alloy bearing of shaftless rim propeller and optimal lubrication gap adjusting method |
| CN113417939B (en) * | 2021-05-14 | 2022-03-22 | 重庆科技学院 | Water-lubricated rubber alloy bearing of shaftless rim propeller and optimal lubrication gap adjusting method |
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Open date: 20090715 |