FR2586462A1 - Device for magnetically supporting a load - Google Patents
Device for magnetically supporting a load Download PDFInfo
- Publication number
- FR2586462A1 FR2586462A1 FR8512586A FR8512586A FR2586462A1 FR 2586462 A1 FR2586462 A1 FR 2586462A1 FR 8512586 A FR8512586 A FR 8512586A FR 8512586 A FR8512586 A FR 8512586A FR 2586462 A1 FR2586462 A1 FR 2586462A1
- Authority
- FR
- France
- Prior art keywords
- producing
- load
- force
- crown
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F6/00—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2402/00—Constructional details of the handling apparatus
- B65H2402/50—Machine elements
- B65H2402/52—Bearings, e.g. magnetic or hydrostatic bearings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
Description
Dispositif de sustentation magnétique d'une charge
La présente invention concerne un dispositif de sustentation magnétique.Magnetic lift device for a load
The present invention relates to a magnetic lift device.
On connait de nombreux organes de sustentation mécanique, hydraulique ou magnétique permettant de supporter des charges d'une manière élastique, cependant dans tous les dispositifs connus, l'effort de sustentation varie en fonction du déplacement vertical de la charge. Many mechanical, hydraulic or magnetic lift members are known which allow loads to be supported in an elastic manner, however in all known devices, the lift force varies as a function of the vertical displacement of the load.
Cela veut dire que si la charge subit des mouvements vibratoires verticaux, la structure support de l'organe de sustentation subit des efforts alternatifs de réaction. Ces efforts alternatifs, subis par cette structure, peuvent être à l'origine de vibrations de la structure support.This means that if the load undergoes vertical vibratory movements, the support structure of the lifting member undergoes alternative reaction forces. These alternating forces, undergone by this structure, can be the source of vibrations of the support structure.
La présente invention a pour but de réaliser un dispositif de sustentation magnétique d'une charge produisant une force de sustentation réglable mais indépendante des déplacements alternatifs de faible amplitude et de fréquence supérieure à une valeur F choisie par avance, subis par la charge. The object of the present invention is to produce a device for magnetic lifting of a load producing an adjustable lifting force but independent of alternating movements of small amplitude and frequency greater than a value F chosen in advance, undergone by the load.
La présente invention a donc pour objet un dispositif de sustentation magnétique d'une charge comprenant un organe fixe et un organe mobile, coaxiaux d'axe G et en matériau magnétique, caractérisé en ce que l'un desdits organes est muni d'un bobinage électrique produisant un flux magnétique axial dévié radialement à chaque extrémité du bobinage par un épanouissement polaire radial laissant un entrefer entre l'épanouissement et l'autre organe; en ce que l'autre organe comporte, en face de chaque épanouissement polaire, des moyens magnéto-moteurs liés audit organe et produisant un flux magnétique ayant des lignes de forces contenues dans des plans passant par l'axe d et produisant, en coopération avec le flux radial sortant desdits épanouissements polaires, une force de sustentaiton axiale, et en ce que ledit bobinage comporte des moyens d'alimentation électrique ajustables en fonction de l'effort de ladite charge, lesdits moyens d'alimentation comportant un asservissement de la position moyenne de l'organe mobile par rapport à l'organe fixe, ledit asservissement n'étant sensible que dans une bande de fréquence inférieure à une valeur F prédéterminée. The present invention therefore relates to a device for magnetic levitation of a load comprising a fixed member and a movable member, coaxial with axis G and made of magnetic material, characterized in that one of said members is provided with a coil. electric producing an axial magnetic flux deflected radially at each end of the winding by a radial polar expansion leaving an air gap between the expansion and the other member; in that the other member comprises, opposite each polar expansion, magneto-motor means linked to said member and producing a magnetic flux having lines of force contained in planes passing through the axis d and producing, in cooperation with the radial flow leaving said polar expansions, an axial support force, and in that said winding comprises electrical supply means adjustable as a function of the force of said load, said supply means comprising a control of the mean position of the movable member relative to the fixed member, said control being sensitive only in a frequency band lower than a predetermined value F.
Selon une première réalisation de l'invention, lesdits moyens magnéto-moteurs comportent, en face de chaque épanouissement -polaire, une bobine électrique d'axe
Selon une seconde réalisation préférée de l'invention, lesdits moyens magnéto-moteurs comportent une couronne d'aimants permanents d'axe t , ladite couronne étant constituée de deux couches superposées et accolées d'aimants permanents, l'une des couches ayant une première polarité sur la face externe de la couronne et une seconde polarité inversée sur la face interne de la couronne et l'autre couche ayant des polarités inversées par rapport à celles de l'autre couche.According to a first embodiment of the invention, said magneto-motor means comprise, opposite each pole expansion, an electric coil with an axis
According to a second preferred embodiment of the invention, said magneto-motor means comprise a crown of permanent magnets of axis t, said crown being made up of two superposed and contiguous layers of permanent magnets, one of the layers having a first polarity on the external face of the crown and a second reverse polarity on the internal face of the crown and the other layer having reverse polarities with respect to those of the other layer.
On va maintenant décrire un exemple de réalisation de l'invention en se référant au dessin ci-joint dans lequel
La figure 1 représente un dispositif de sustentation selon l'invention.We will now describe an embodiment of the invention with reference to the attached drawing in which
FIG. 1 represents a lifting device according to the invention.
La figure 2 représente un autre dispositif de sustentation selon l'invention dans une réalisation préférée de l'invention. FIG. 2 represents another lifting device according to the invention in a preferred embodiment of the invention.
La figure 3 montre, en vue agrandie, un détail de la figure 2. FIG. 3 shows, in an enlarged view, a detail of FIG. 2.
La figure 4 est un schéma montrant l'alimentation électrique -du bobinage inducteur et son asservissement. Figure 4 is a diagram showing the power supply -inductor winding and its control.
Les figures 5 à 8 sont des schémas montrant les diverses possibilités de la disposition relative des éléments. Figures 5 to 8 are diagrams showing the various possibilities of the relative arrangement of the elements.
En se reportant à la figure 1, on voit un dispositif de sustentation comprenant un noyau magnétique 1 d'axe 8 constituant dans cette figure un organe fixe. Referring to Figure 1, there is shown a lifting device comprising a magnetic core 1 of axis 8 constituting in this figure a fixed member.
Sur ce noyau est monté un bobinage électrique 2 alimenté électriquement conformément à la figure 4 décrite ultérieurement. On this core is mounted an electric coil 2 electrically powered in accordance with Figure 4 described later.
Aux extrémités haute et basse du bobinage 2, le noyau 1 comporte des épanouissements polaires radiaux 3 et 4. Autour du noyau et coaxialement est disposé une culasse magnétique 5 qui constitue, dans cette figure 1, un organe mobile "flottant" destiné à supporter une charge non représentée. En face de chaque épanouissement polaire 3 et 4, la culasse 5 est munie d'une bobine électrique, respectivement 6 et 7, parcourue par un courant I et produisant un flux magnétique dont les lignes de forces sont contenues dans des plans passant par l'axe ss
En fonctionnement, le bobinage 2 produit dans le noyau 1 un flux d'induction axial dévié radialement par les épanouissements polaires 3 et 4. Ce flux traverse les entrefers e entre chaque épanouissement et la culasse 5 et- il se referme par la culasse 5.Les bobines 6 et 7, parcourues par un courant I et soumises à une induction 3 régnant dans l'entrefer, sont soumises à un effort axial, de même sens Si les bobines sont parcourues par des courants de sens contraire et ascendant si l'on a pris soin d'alimenter dans le bon sens le bobinage 2. Si la hauteur des épanouissements polaires 3 et 4 est choisie suffisamment grande par rms- port à celle des bobines 6 et 7, l1induction dans laquelle baigne ces bobines est constante même si elles se déplacent légèrement par rapport au noyau.Il en résulte, dans de telles conditions, que l'effort de sustention est indépendant des petits déplacements de la culasse 5 earme par exemple des vibrations. il en est de marne dans ne cas inverse, c'est-à-dire si la hauteur des épanouissements polaires 3 et 9 est suffisamment faible vis-à-vis de la hauteur des bobines 6 et 7.At the upper and lower ends of the winding 2, the core 1 has radial polar expansions 3 and 4. Around the core and coaxially is arranged a magnetic yoke 5 which constitutes, in this figure 1, a movable "floating" member intended to support a charge not shown. Opposite each polar expansion 3 and 4, the yoke 5 is provided with an electric coil, respectively 6 and 7, traversed by a current I and producing a magnetic flux whose lines of force are contained in planes passing through the ss axis
In operation, the winding 2 produces in the core 1 an axial induction flow deflected radially by the pole shoes 3 and 4. This flow passes through the air gaps e between each bloom and the cylinder head 5 and it closes by the cylinder head 5. The coils 6 and 7, traversed by a current I and subjected to an induction 3 prevailing in the air gap, are subjected to an axial force, in the same direction If the coils are traversed by currents of opposite and ascending direction if one took care to feed the winding 2 in the right direction. If the height of the pole shoes 3 and 4 is chosen to be large enough by comparison with that of the coils 6 and 7, the induction in which these coils are constant is constant even if they move slightly relative to the core. As a result, under such conditions, the support force is independent of small movements of the 5 earme cylinder head, for example vibrations. the same is true in the opposite case, that is to say if the height of the pole shoes 3 and 9 is sufficiently low with respect to the height of the coils 6 and 7.
Ceci permet de ne pas transmettre à la structure, liée au noyau 1, les vibrations éventuelles d'une charge reposant sur la culasse 5. This makes it possible not to transmit to the structure, linked to the core 1, the possible vibrations of a load resting on the cylinder head 5.
La figure 4 est un schéma montrant l'alimentation électrique du bobinage 2. FIG. 4 is a diagram showing the electrical supply of the winding 2.
Il est alimenté par la sortie 8 d'un amplificateur opérationnel 9 recevant sur son entrée 10, d'une part et à travers une impédance d'entrée 11, une tension de consigne X, en fonction de la position moyenne recherchée, prise sur une résistance potentiométrique entre O et V volts' et d'autre part à travers une impédance d'entrée 14, une tension représentative de la position de la culasse 5 par rapport à la bobine 2, fournie par un capteur de position 15. L'ensemble comprend une boucle de contre réaction composée d'une résistance 16 et d'un condensateur 17. La bande passante de l'appareil est choisie basse, inférieure à une valeur F de l'ordre de quelques Hertz, par exemple deux ou trois
Herts.It is supplied by the output 8 of an operational amplifier 9 receiving on its input 10, on the one hand and through an input impedance 11, a reference voltage X, as a function of the desired average position, taken from a potentiometric resistance between O and V volts' and on the other hand through an input impedance 14, a voltage representative of the position of the yoke 5 relative to the coil 2, supplied by a position sensor 15. The assembly includes a feedback loop composed of a resistor 16 and a capacitor 17. The bandwidth of the device is chosen to be low, less than a value F of the order of a few Hertz, for example two or three
Herts.
Ainsi, par cet asservissement, la culasse 5 est libre d'osciller à des fréquences supérieures à F mais par contre, on empeehe tout mouvement à une fréquence inférieure à F. Ceci permet d'éviter de transmettre au noyau 1 et par lui à la structure support du dispositif les vibrations de la charge à supporter. Thus, by this enslavement, the yoke 5 is free to oscillate at frequencies higher than F but on the other hand, any movement is prevented at a frequency lower than F. This makes it possible to avoid transmitting to the core 1 and by it to the support structure of the device vibrations of the load to be supported.
La culasse 5 est guidée à son extrémité supérieure par un palier coulissant haut i8 et à son extrémité inférieure par un palier coulissant bas 19. En période de non fonctionnement du dispositif, la culasse 5 repose sur une butée 20. The cylinder head 5 is guided at its upper end by a high sliding bearing i8 and at its lower end by a low sliding bearing 19. When the device is not operating, the cylinder head 5 rests on a stop 20.
La figure 2 montre une variante préférée de linvention. En effet, un appareil tel que celui représenté figure 1 ne peut pas produire une force de sustentation très élevée à cause des ampères-tours nécessairement réduits des bobines 6 et 7. Figure 2 shows a preferred variant of the invention. Indeed, an apparatus such as that shown in FIG. 1 cannot produce a very high lift force because of the necessarily reduced ampere-turns of the coils 6 and 7.
Dans le cas de la figure 2, où les même organes sont repérés par les mêmes références, les bobines 6 et 7 sont remplacées par des couronnes d'aimants permanents. In the case of FIG. 2, where the same members are identified by the same references, the coils 6 and 7 are replaced by crowns of permanent magnets.
Chaque couronne est constituée de deux couches d'aimants. Si, comme on lta représenté sur la figure 2, le bobinage 2 est tel que l'épanouissement polaire supérieur 3 constitue un pole Sud, la couronne supérieure d'aimants permanents comprend une couche supérieure 21 d'aimants dont la polarité est Nord sur la face externe et Sud sur la face interne, et une couche inférieure 22 de polarité inversée. Une telle couronne est représentée à échelle agrandie figure 3. Les couches 21 et 22 sont accolées et fixés à la culasse 5. Each crown consists of two layers of magnets. If, as shown in FIG. 2, the winding 2 is such that the upper pole position 3 constitutes a South pole, the upper ring of permanent magnets comprises an upper layer 21 of magnets whose polarity is North on the external face and South on the internal face, and a lower layer 22 of reverse polarity. Such a crown is shown on an enlarged scale in FIG. 3. The layers 21 and 22 are placed side by side and fixed to the cylinder head 5.
la couronne inférieure se compose également de deux couches 21 et 22 mais inversées de façon à ce que les efforts produits aient le meme sens. the lower crown also consists of two layers 21 and 22 but inverted so that the forces produced have the same direction.
Les hauteurs relatives des épanouissement polaires 3 et 4 et des couronnes d'aimants fixent l'indépendance de la force de sustentation et du déplacement de la charge reposant sur la culasse 5. Les dimensions des épanouissements polaires fixent l'amplitude des variations. The relative heights of the pole shoes 3 and 4 and of the magnet rings fix the independence of the lifting force and of the displacement of the load resting on the cylinder head 5. The dimensions of the pole shoes determine the amplitude of the variations.
La culasse peut avantageusement être feuilletée au droit des épanouissements polaires de façon à ce que des vibrations de fréquences élevées ne soient pas amorties par des courants de Foucault dans la culasse. The cylinder head can advantageously be laminated in line with the pole shoes so that vibrations of high frequencies are not damped by eddy currents in the cylinder head.
Les figures 5 à 8 sont des schémas montrant les quatre dispositions relatives possibles : culasse 5 mobile et noyau central 1 fixe ou vice-versa et d'autre part, bobinage inducteur 2 disposé sur le noyau central 1 et couronnes d'aimants liées à la culasses 5 ou vice-versa. FIGS. 5 to 8 are diagrams showing the four possible relative arrangements: movable cylinder head 5 and central core 1 fixed or vice-versa and on the other hand, field winding 2 arranged on the central core 1 and crowns of magnets linked to the 5 cylinder heads or vice versa.
Par sustentation il faut entendre par convention tout effort s'opposant à une force subie par la charge sans que cet effort soit nécessairement vertical et bien que l'application décrite considère un effort de support vertical de charge. By lift is understood by convention any effort opposing a force undergone by the load without this effort being necessarily vertical and although the application described considers a vertical load support effort.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8512586A FR2586462B1 (en) | 1985-08-21 | 1985-08-21 | DEVICE FOR MAGNETICALLY SUPPORTING A LOAD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8512586A FR2586462B1 (en) | 1985-08-21 | 1985-08-21 | DEVICE FOR MAGNETICALLY SUPPORTING A LOAD |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2586462A1 true FR2586462A1 (en) | 1987-02-27 |
| FR2586462B1 FR2586462B1 (en) | 1987-10-30 |
Family
ID=9322323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8512586A Expired FR2586462B1 (en) | 1985-08-21 | 1985-08-21 | DEVICE FOR MAGNETICALLY SUPPORTING A LOAD |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2586462B1 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0361670A2 (en) * | 1988-08-31 | 1990-04-04 | Aura Systems, Inc. | Electromagnetic actuator |
| WO1990013895A1 (en) * | 1989-04-29 | 1990-11-15 | Deutsche Thomson-Brandt Gmbh | Device with vibration-sensitive parts |
| EP0514877A2 (en) * | 1991-05-20 | 1992-11-25 | Ebara Corporation | Vibration eliminating apparatus for eliminating vibration of installation floor |
| WO1997009540A1 (en) * | 1995-09-02 | 1997-03-13 | Magnetic Suspensions (Ireland) Ltd. | Magnetic suspension system |
| EP0767321A2 (en) * | 1995-10-02 | 1997-04-09 | Kabushiki Kaisha Toshiba | Dynamic vibration absorber |
| GB2317717A (en) * | 1995-09-02 | 1998-04-01 | Magnetic Patent Holdings Ltd | Magnetic suspension system |
| WO2008004854A1 (en) * | 2006-07-05 | 2008-01-10 | Ab Skf | Spring, assembly of spring and a damper, as well as a vehicle |
| EP1947366A1 (en) * | 2007-01-22 | 2008-07-23 | Commissariat A L'energie Atomique | System limiting the transmission of mechanical vibrations by frequential filtering |
| CN102537167A (en) * | 2011-12-31 | 2012-07-04 | 北京交通大学 | Magnetic liquid vibration-reduction device |
| CN104948656A (en) * | 2015-05-05 | 2015-09-30 | 常州大学 | Three-direction equal-stiffness vibration isolator on basis of magnetic suspension damping decoupling |
| CN114321246A (en) * | 2022-01-04 | 2022-04-12 | 中国船舶重工集团公司第七0四研究所 | Small-size electromagnetic actuator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748419A (en) * | 2011-04-22 | 2012-10-24 | 赖向阳 | Magnetic suspension damping method |
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|---|---|---|---|---|
| DE330994C (en) * | 1919-04-26 | 1920-12-28 | Franz Van Treeck | Elastic bearing |
| FR1214953A (en) * | 1958-10-14 | 1960-04-13 | Advanced magnetic damper | |
| GB974578A (en) * | 1963-02-28 | 1964-11-04 | Ceskoslovenske Zd Y Naftovych | Improvements in or relating to damping devices |
| DE6606380U (en) * | 1965-03-24 | 1970-09-17 | List Dipl Ing Heinrich | MAGNETIC SPRING. |
| FR2379732A1 (en) * | 1977-02-04 | 1978-09-01 | Europ Propulsion | HORIZONTAL STABILIZATION DEVICE FOR A MASS WITH VERTICAL INERTIAL SUPPORT |
| US4370004A (en) * | 1979-04-28 | 1983-01-25 | Mitsubishi Precision Co., Ltd. | Magnetically suspended type momentum ring assembly |
| EP0098002A2 (en) * | 1982-06-30 | 1984-01-11 | Koninklijke Philips Electronics N.V. | Magnetically suspended linear motor |
-
1985
- 1985-08-21 FR FR8512586A patent/FR2586462B1/en not_active Expired
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE330994C (en) * | 1919-04-26 | 1920-12-28 | Franz Van Treeck | Elastic bearing |
| FR1214953A (en) * | 1958-10-14 | 1960-04-13 | Advanced magnetic damper | |
| GB974578A (en) * | 1963-02-28 | 1964-11-04 | Ceskoslovenske Zd Y Naftovych | Improvements in or relating to damping devices |
| DE6606380U (en) * | 1965-03-24 | 1970-09-17 | List Dipl Ing Heinrich | MAGNETIC SPRING. |
| FR2379732A1 (en) * | 1977-02-04 | 1978-09-01 | Europ Propulsion | HORIZONTAL STABILIZATION DEVICE FOR A MASS WITH VERTICAL INERTIAL SUPPORT |
| US4370004A (en) * | 1979-04-28 | 1983-01-25 | Mitsubishi Precision Co., Ltd. | Magnetically suspended type momentum ring assembly |
| EP0098002A2 (en) * | 1982-06-30 | 1984-01-11 | Koninklijke Philips Electronics N.V. | Magnetically suspended linear motor |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0361670A2 (en) * | 1988-08-31 | 1990-04-04 | Aura Systems, Inc. | Electromagnetic actuator |
| EP0361670A3 (en) * | 1988-08-31 | 1990-07-11 | Aura Systems, Inc. | Electromagnetic actuator |
| WO1990013895A1 (en) * | 1989-04-29 | 1990-11-15 | Deutsche Thomson-Brandt Gmbh | Device with vibration-sensitive parts |
| EP0514877A2 (en) * | 1991-05-20 | 1992-11-25 | Ebara Corporation | Vibration eliminating apparatus for eliminating vibration of installation floor |
| EP0514877A3 (en) * | 1991-05-20 | 1993-01-20 | Ebara Corporation | Vibration eliminating apparatus for eliminating vibration of installation floor |
| US5385217A (en) * | 1991-05-20 | 1995-01-31 | Ebara Corporation | Vibration eliminating apparatus for elminating vibration of an installation floor |
| WO1997009540A1 (en) * | 1995-09-02 | 1997-03-13 | Magnetic Suspensions (Ireland) Ltd. | Magnetic suspension system |
| US6154353A (en) * | 1995-09-02 | 2000-11-28 | Magnetic Patent Holdings Limited | Magnetic suspension system |
| GB2317717A (en) * | 1995-09-02 | 1998-04-01 | Magnetic Patent Holdings Ltd | Magnetic suspension system |
| GB2317717B (en) * | 1995-09-02 | 1998-05-27 | Magnetic Patent Holdings Ltd | Magnetic suspension system |
| EP0767321A3 (en) * | 1995-10-02 | 1998-06-10 | Kabushiki Kaisha Toshiba | Dynamic vibration absorber |
| EP0767321A2 (en) * | 1995-10-02 | 1997-04-09 | Kabushiki Kaisha Toshiba | Dynamic vibration absorber |
| WO2008004854A1 (en) * | 2006-07-05 | 2008-01-10 | Ab Skf | Spring, assembly of spring and a damper, as well as a vehicle |
| WO2008004871A1 (en) * | 2006-07-05 | 2008-01-10 | Ab Skf | Spring, assembly of springs, assembly of a spring and a damper, as well as a vehicle comprising a spring |
| CN101506539B (en) * | 2006-07-05 | 2011-04-13 | Skf公司 | Spring, assembly of spring and a damper, as well as a vehicle |
| CN101563551B (en) * | 2006-07-05 | 2013-04-24 | Skf公司 | Spring, assembly of springs, assembly of a spring and a damper, as well as a vehicle comprising a spring |
| US8550221B2 (en) | 2006-07-05 | 2013-10-08 | Aktiebolaget Skf | Magnetic spring, a spring and damper assembly, and a vehicle including the spring |
| EP1947366A1 (en) * | 2007-01-22 | 2008-07-23 | Commissariat A L'energie Atomique | System limiting the transmission of mechanical vibrations by frequential filtering |
| FR2911651A1 (en) * | 2007-01-22 | 2008-07-25 | Commissariat Energie Atomique | SYSTEM FOR LIMITING TRANSMISSION OF MECHANICAL VIBRATIONS BY FREQUENCY FILTRATION. |
| US7942251B2 (en) | 2007-01-22 | 2011-05-17 | Commissariat A L'energie Atomique | System limiting the transmission of mechanical vibrations by frequency filtering |
| CN102537167A (en) * | 2011-12-31 | 2012-07-04 | 北京交通大学 | Magnetic liquid vibration-reduction device |
| CN104948656A (en) * | 2015-05-05 | 2015-09-30 | 常州大学 | Three-direction equal-stiffness vibration isolator on basis of magnetic suspension damping decoupling |
| CN114321246A (en) * | 2022-01-04 | 2022-04-12 | 中国船舶重工集团公司第七0四研究所 | Small-size electromagnetic actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2586462B1 (en) | 1987-10-30 |
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