CA1239960A - Magnetic suspension for a vehicle - Google Patents

Abstract

MAGNETIC SUSPENSION FOR A VEHICLE
Abstract of the Disclosure A magnetic suspension for a vehicles comprising a guide rail vertically mounted on a track and an un-derframe having a magnetic system surrounding lateral sides of the guide rail on which are mounted strips of permanent magnets. The magnetic system of the under-frame also comprises strips of permanent magnets in-stalled on the lateral sides of the underframe facing toward the guide rail, the strips of permanent magnets being installed with a spacing equal to the spacing of the strips of the guide rail, the polarities of pole facets of the strips facing toward one another being different.

Description

~ield of the Art he invention relate3 to the tran~portQtion en-gineerinO, and in particular, it d~al~ with a magnetic ~u~pen~ion for a vehicl0 de~igncd ~or pa~enger and frelght transportation~
Known in the ~rt are magnetic su~pen~ion~ wherein an under~rame of a ~ehicle nove~ alon~ a guide rail hori~ontally extending on a trackg arld an air gap i~
provided between cooperatin~ members of -khe magnetic ~uspensionl e.g. between magnetic poles of the under-frame and ~,uide rail~ owing to the mutual repul~ion o~
magnet~ of the under~rame and guid~ rail; rs~pectively~
However, during the movemerlt, the air gap chan~s during vertical o~cillations of the v~hicle under~ram~
under th~ action o~ variolls perturbance~ thu~ endanger-ing the movement. ~or this reason~ the air gap betwe~n the oooperatln~ ~ember~ o~ the magnetic su~pen~ion ~hould be i~cre~ed which re~ults in an increa~ed ener-gy consumption ~nd magnet~ weight. In additiong the sur.Lace3 of magn~tic 3trip~ oi the ~u~pe~sion which are installed on th~ tracX ar~ prone tc fouling with fo-reign object~ and atmo~pher~c precipit~te~ 90 that there i~ an addad C09t of ~rack cleaning and in~peotion~
The~e are mainly the factor~ whlch ~re no~ h~p2rin~
~ide applicatio~ of mag~etic ~u~pen~ion~ for vehicles ~ 2 ~
Ya~7 with horizontally extendi~g guide rail~0 ~ agnetic su~qpensions with ver~ically extending cooperating mem~ers appear to be more promisin~ ~Siith such a~ arrangement, all vertical oscillation~ o~ the under~ra~e with respect to the track would not result in a change in the gap between the cooperati~g members of the magnetic suspsn_ion9 the gaP remaining substan-tially constant. Such magnetic su_pension~ are not pro~e to fouling ~ith :~oreign object~ and atmospheric preci-10 pitates as they cannot hold on the guide rail~
The air gap that does not depend on oscillationso~ the underframe and the immunity o~ such magnetic sus-pensions to ~ouling make it possible to reduce the gaP
b0tweeR the surraces o~ -the cooperating me~bers as com 15 pared to the above structure~ so that the load carrying capacity o~ a vehicle can be increasad, Among such magnetic suspensions i~ a mag~etic sus-pa~sio~ disclosed in US patent No. 3828686, Int.Cl. B
61 B. ~he magnetic suspension comprises guide rails 20 made o~ a ferrom~gnetic material and i~stalled on the track and an electrical winding mounted on the under frame o~ a vehicle and on a core vertically extending between guide rails.
This ~agnetic quspen3io~ does ~o t 9 however, have 25 reliability whicA would be adequate ~or the tran~por-tation purposes since an interruptio~ o~ power suppl~
o~ the elec-trical windingr results in the lo~s o~ t-~3~

ing ~orce o~ the suspe~sio~ and in accidents. In addi-tion, the magnetic suspension of tnis type require~
a nign accuracy o~ ~t~e relative po~ition o~ the guide rail~ and core since a ~u~icien~ stabi~i ~ (gradient) 5 o~ ting ~orce cannot be achieved within the actually occurring range o~ vertical displacements ol the ve-hicle under~rame~
Background o~ the Invention The closest prior art o~ the inve~tion is a magne-10 tic suspension OI a vehicle (c~. IJSSP~ Inve~tor~s Cer-tificat3 No.. 464469, Cl. B21B~ 1982) ~ comprising a guide rail vertically i.n~talled on the track and havi~g la-teral sides o~ a magnetically conducti~ mat~rial aud an under~rame surrounding the lateral ~ide~ o~ the 15 guide rail and having a magne tic system in the ~orm of horizontally extending s~rips of magnets, the polarity o~ -the pole facets o~ the mag~et~ facing tow~rd the la-teral sides o~ the guide rail alternating in tha ver~
tieal direction. ~he maglletic 9y~tem also comprises a 20 mea~ ~or lateral ~tabilization O:e the under~xame pre-ven-ting it ~rom as~mmetrically displaci~g with respect to the ~uide rail. The magnets o~ the uader~rame create magnetic :~luxe9 that close at teeth provided on the la teral sids o~ the guide rails, During a vertical di~
25 placeulenk o:~ -the vehicle under:~rame, th~ Ztirlg force o:~ the su~pension passing through its ma}~imum will drop and decrea3e -to zero when the teeth o:e the guide rail will be disposed s~mmetrically with respect to two ad-jace~t pole ~ts of the electromagnet9 iOe, the zone of admis~ible vertical di~placements of the vehicle underframe should be smaller than one half the distance between adjacent pole facets of the ~agnets o~ the ve-hicle under~rame so that the amount o~ admissible ver-tical displacements of the underframe is limited and high accuracy is re~uired in the manu~acture of the guide rail ~o as to ensure the desirad ~tabilit~ of a vehicleO In addition, i~ the magnetic suspen~ion of this t~pe, it i9 necassary to e~s~r0 a high ~agnitude o~
~agnetiæing ~orce of the magnets since magnetic flux created b~ the magne~s of the under~rame is closed thro-u~ two air gaps. ~hese circumstances discourage the use of per~anent magnets in the ~agnetic suspensio~ as sources of magnetic field since magnetizing force o~
permanent magnets in such a suspension remai~s i~adequ~
ate for building-up necessary li~ting ~orce. Such magn~-tic su~pension can o~ly be built with electromagnets that ~eature high ener~ consumption and require much non-ferrous metala for their manu~acture while 9 a~ the same time, laking reliabilit~ because an in~erruption o~ power supply re~ults in disappearance o~ lifting ~orce and in emergency situations~
Summar.~ of the I~ve~tio~
It is an obaect of the inventio~ to i.~crease ~oad car~ying capacit~ o~ the magnetic su~pension, improve ~3~

it3 stability and reliabiLity i~ operation ~ith a con-current reduction o~ metal weight and energy con~ump-tion, The above problem is solved by that in a magnetic suspension for a vehicle~ comprising at least one guide rail installed vertically on the track and having later-al sides of a ma~netically conduc-ting mater.ial and an underframe having a means ~or stabilizing i-ts lateral position and surroundi~g the lateral sides o~ the guide rail and a magnetic system having horizontally e~tend~
ing pole ~ac~s, the polarities of the pole facets fac-ing toward the lateral sides o~ the guide rail alternat-ing in -the vertical direction~ according to tho i~ven-tion, the magnetic system o~ the under~rame is made o~
5trip9 0~ permanent magnetal strips of perma~ent mag-nets are installed to e~tend horizontall~ on the later al sides o~ the guide rail, the spacin~ of the strips being identical tv the spacing o~ the strips o~ perma-nent magnets o~ the unde~frame~ the polariti0s o~ the pole ~acets o~ -the latter strips and the polarities of the pole :~acet~ of the strips o~ the guide rail ~acing toward them bein~ di~erent, In a magnetic suspension ~or a vehicle according to the inven-tion, the strips of permanent magnets of 25 the under~rame are pre~erabl~ installed on substrates o~ a magnetically conducting material and the under~
frame pre~erably comprisea at least o~e rigid bracket.

~ 6 -23~

'~he mag~etic suspension according to t~a i~ven~
tion may haYe at least one au~iliary guide rail having strip~ o~ perma~e~t magnets~ the underrrame having sub s-trates o~ a magnetically conducting material o~ which are mounted strips o~ permanent mag~ets 3 the subs-trates disposed on the out~r sides o~ the guide rails being rigidly con~ected to the vertical ribs o~ the rigid bracket o~ the underPrame7 the substrates o~ the strips o~ magnets disposed between the guide rails being se-cured to the base of the rigld bracket.
According to the invention, the magnetic suspensi-on may be made in such a manner that o~e guid~ rail is rigidly mounted on the track and the other ~uide rail~ are ins~alled on tha track for lateral di~place;-mentsO
The magnetic suspension according to t~e inven-~ion may also comprise plates of a non mag~etic electri-cally conducti~g material installed on the guide rail on the pole ~acets o~ the strips of permanent ma~nets facing toward the vehicle underframe~
Iu the magnetic suspension according to the in vention7 the permanent magnets forming the strips o~
the guide rail and under~rame are prefexabl~ made in the ~orm o~ bar~ o~ a magnetically hard material.
The magnetically hara ~a~erial used iu the mag~
netlc ~uspension according to the iQVentiOn i9 prefer-ably a ~errite.

~ ~3~

The abovedescribed features of the mag~etic sus-pension for a vehicle make it possible to increase the amplitude o~ its admissible ~ertical oscillations there-by improving stability o~ -the su~pension.
~t the same time, the magnetic suspension accord-ing to the inve~tion o~ers tke possibility of the prac-tical application of permane~t magnets which do not re-quire electrical power supply ~0 that reliabilit~ of the magne-tic suspension in operation is improved and 10 safety of its operatio~ en9uredO
~ he inve~tion is also advantageous i~ a lower me-tal weight of the su9pensio~ since non-~errous metals are not used for making electrical wi~dings, and co~
sumption of mag~e-tically conducting materials for the lS manufacture o~ the guide rail ia also reduced.
Brief Descriptio~ of t~e Drawin~s Figure 1 shows a magnetic suspension for a vehicle according to the invention ~in a cross-sectiunal view)~
Figure 2 is a diagrammatic view illustratin~ the 20 position of horizo~tally extendin~ strips of permanent magnets on the guida rail and on one side of the ve-hicle underframe according to the invention~
Figure 3 show~ another embodiment o~ the magne~
tic suspension hav~g two guide rails aocordi~g to the 25 i ~vention 3 ~ igure 4 is a general view 4f the underframe adja-cent to a portion of the guide rail covered with non-- 8 _ . ~ . . ;

~3~Q

ma~netic el~c-trically conducting plates according to the invention J
Figure 5 is a ~ide elevation view o~ the under-frame and guide rail according to the invention;
Figure 6 is a sectio~al view taken along line VI--VI in Figure 5.
Detailed Description o~ the Inve~tion From a track 1 (Figure 1~, b~ means of clamp~ 2 10 is suspended a steel guide rail 3. Hoxizontally e~tend ing parall01 strips 4 o~ permanent magne.~s are secured to the later~l sides of the guide rail 3. Non-magnatic spacers 5 are provided betwee~ the ~trips 4 to ~acili-tate asse3lbl~ o~ the guide rail 3. An under~rama 6 of 15 the magnetic suspensio~ comprises a rigid bracket 7 sux-rounding the lateral sides of the guide rail 3. Subst-rate~ 8 of a magnetically conducting material are se-cured to the rigid bracket 7, and horizontally exte~d~
ing parallel strips 9 o~ permanent magnets alternating 20with non-magnetic inserts 10 are installed on the sub-stratesO A mea~s for lateral stabilization of the under-~rame 6 is also mounted o~ the rig.id cracket 7 and com~
prise9 moun^ting arms 11 in which are mounted rollers 12 running along the lateral sides of the guide rail ~.
25a pullrod 13 is used ~or suspending a load container 14 ~rom th~ rigid bracket 7 of the underframa 6. ~he strips 4 of permane~t magnets o~ the guide rail 3 and the strips 9 o~ permanent magnets of the under~rame 6 are - 9 _ ~.

:~3~

ide~tically vertically spaced and dispo~ed opposite bO one another~ Polarities of ~he pole facets 15 o~
t~e strip3 4 aQd 9 of permanent magnets alter~ate in the vertical direction, the polaritie~ o~ the pole ~a-5 cets 15 (Figure 2) of op~osite strip~ 4 a~d 9 of per~manent magnets being di~Yere~t.
In the magnetic suspension according to the in-vention, the strips 4 and 9 are formed by permanent magnets in the ~orm of bars of a magneticall~ hard ma-10 terial such as ~errite so as to dispe~se with power sup-ply. ~his ~acilit~ makes it possL~le to avoid emer~ency si-tuations otherwise u~aVoidable upon i~terrup-tions of power ~upply.
I~ addition9 the consumption of me~al ~or the ma-15 nu~acture of the guide rail and magnets is reduced asthey do not require an electrical winding made o~ non-ferrou~ me-tals, and the guide rail ~ does not have me-tal teethO
Figura 3 show~ another embodiment o~ the magnetic 20 suspe~sio~ having ~wo guide rails 3 a~d 16 installed on the track 1 b~ means o~ mou~tin~ arm~ 17. '~he guide rail 3 is rigidly mounted on the arms 17 and the auxi-liary rail 16 i~ installed on the track for lateral displacements which .i9 achieved b~ a mounting struc~
25 ture o.~ the arms 17 having pi~ 18 received in holes 1~ o~ the guide rail 16.
~he u~der~rame 6 of a vehicle compri~e~ a ri~id bracket 7. The strips 9 of perma~ent ma~n~ts are mo-un~ed on the substrate3 8 rigidly ~ec~red to the ver- -tical walls of the rigid bracket 7 ~aci~g toward the outer sides o~ the guide rails 3 a~d 16. ~nother sub-strate 2a disposed between the æuida rails ~ and 16has its end race portion secured to the ba~e o~ the ri-gid bracks~ 7. ~he strips 4 a~d 9 o~ permanent ~agnets, are secured1~vith the intexposition o~ ths non-magnetic s~acers 5 and 10, to the lateral sides o~ the guide rails 3 and 16 and also to the ~ubstrates 8 and 20 of the underframe 6. The arranKement and polarities of the strips 4 and 9 o~ the guide rails 3 and 16 and under-frame 6 are similar to those ol' the embodiment ~hown in ~igure 1~
A means for s~abilizi~g this magnetic suspenslon .(Fi~ure ~) compri~es arm~ 11 havin~ rollers 12 which are installed on the rigid bracket 7 and run along the outer lataral sides o~ the guide rails 3 and 16, and arm~ 21 mou~ted on the ~ubstrate 20 and having rollers 22 runni~g along the inner lateral sides of the guide rail9 3 and 160 This embodiment of the magnetic suspension make3 it possible to increase its load carr~in~ capacity where-as the weight o~ the u~der~rame 6 i9 only slightly in-crea~ed becausa the ~ubstrate 20 is thi~ a~d the require-ment~ imposed upon its rigidi-t7 are mucn lower than .
tnose imposed upon rigidit~ of the bracket 7.

11~

'rne pro~i3ion OL~ the laterall, ~isplaceaele ~uide rail 16 ~acilitates i~stallatio~ o~ -the magnetic sus~
pension as a wmole, and the desired distance b_t.~Jeen the guide ralls 3 and 16 is self-adjusted d~ring nove-5 ment oi the underframe 6.
~ igures ~,5,6 sho~iv still ailother e~bodiment ofthe ma~netic suspension. ~era the strips 4 of permanent ~agnets mounted on the guide rail 3 are covered with ~lates 23 of a no~-mag~etic electricall~ co~ducting lO m~terial ~,~hich ensure an improved stabilit~ o~ the mag-netic su~pension at high speeds. In other respec-ts the construction o~ the maOnetic sur~pension is similar to that shown in Fi~ure l.
Figure 5 3ho~/s a side elevation vie~ o~ the under-frame 6 consis-ting o~ two rigid brackets 7 to which i5 rigid~Ly secured the substrate 8 and the guide rail having plates ~3 of a non-magnetic electrically con ducti~g ~aterial i~stalled -thereon.
Figure 6 is a sectional view taken along line VI--VI in Figure 5. It is clearly seen in this Figure that the ~trips 4 and 9 of permanent magnets are made in the form of bars mounted on the ~uide rail ~ a~d under-Lra~e ~. 'rhe ~trip~ ~ aI~e covered ,uith the plate~ 23 o~ a non-magne~ic electricall~ conductin~ material~
The magnetlc suspension according -to the inven~
tion functions in t~e ~ollowing manner.
~urin~J :LoadingJ of the container L~ r~-e l) the under~rame 6 move9 ~own under Oravity. During the vertical displaceme~t o~ the u~derframe 6 o~ the vehicle the strips 9 of perma~ent magnets of -the under~rame 6 will move down relative to the opposi-te strips 4 of per-manent magnets disposed on the guide rail ~.
The i~teractiou o~ the opposite strips 9 and 4movi~g vertically relati~e to o~e another will create a lifting ~orce caused by their a~traction owing to the unlike polarities o~ their pole ~acets 15~
~ach ~trip 9 of the underframe 6, ~a~e the bot-tom o~e~, will also interact with the underlyi~g strip 4 o~ the guide rail 3 havinO the like polarity o~ the pole ~acet 15 which i-t will approach as the under~rame 6 moves downa This interaction o~ the strips 9 and 4 will also create a liftlng force caused by their repul~
sion. ~he total li~ting ~orce will make up for the ver~
tical load ap~lied to the under~rame 6 under gravit~ o~
the vehicle. Forces o~ la-teral attrac-tion of the strip4 4 and 9 acting on elther side o~ the guide rail 3 are taken up b~ the rigid bracket 7 so that a load equal to the di~erence between ~orces o~ attraction o~ the strips 9 to~vard the ~trips 4 on either lateral side of the g.uide rail will act upo~ the rollers 12 o~ the sta-bilizing mea~s.
The rollers 12 o~ the stabilizi~g mean~ will pro~
vide ~or the equality of clearances betwee~ the strips 9 and 4 on either side o~ the O~uide rail 3~ The closer the amoun-ts o~ clearances to each other1 t~e lower .is the load on the rollers 12 and the re~is~ance to move-ment o~ tha under~rame 6. As the vertical displacement o~
the under~rame 6 downward increases, the liting ~orce o~ the magnetic SU~peGSiOn becomes greater and achieves its maximum when the displacement o~ the u~der~rame 6 is equal to one hal~ ~he spacing o~ the strips 4 and 9~
I~ cas3 there are perturbing ~orces causing pi-tch-ing (galloping) o~ the u~der~rame 6, the strips 4 and 9 get out o~ parallelism w~th one another (se~ Figur0

2) o As certain magnetic strips 4 and 9 facing -50ward ~ach other ~ith unlike pole ~ace-ts 15 will tend to take a position w~en ~tney would run in parallel witn each other and other stxips 4 and 9 ~acing toward each oth er with their like pole ~acets will move apaxt, a mo-ment i3 buil-t~up which opposes tha pitching ~galloping) o~ the under~ra~e 6 which, alon~ with an increase in the admi~sible vertical displacement of -the u~de.r~ra~e 6, prevents it .t'rom losing stability, The magnetic suspension shown in Figure 3 ~unc-tions in just the same manner as described above . The par-ticulax ~ea-ture o~ this ~mbodiment resides in an increased number o~ cooperating strips 9 and 4 to in-crease the load carryin~ capacity o~ the mag~etic sus~
pa~sio~ which i.s achieved by the provisio~ o~ ano-ther.
guida rail 16 rather than by increasin~f3~ the number o~
s-trips 4 o~ the ~uide rail 3 becau~e such an increase ~ould have resulted ln a larger vertical dimension o~
tne ~ui~e rail ~ a~d under~rame 6~ ~hi ~,lray of irlcreas-in~ the loacl carrying capacity ~,Yould have required an improved accuracy in makin~ the rail ~ and resulted in 5 an increased wei~ht o~ the u~der~rame 60 Con-trary to this, in this embodiment o~ the magne-tic suspe~lsio~ the substrate 20, which is a load bearing member o~ the un~
derframe 6, does not take~up bendi~g ~orce~ as the strips 9 are installed on either side thereo~ and ~orc-10 es o~ lateral attractio~ o~ the s-trips 9 acting on ai-ther side o~ the substrate 20 compe~sa-te ~or each other~
There~ore, the substrates 20 may have minimum possible rigidity in the horiæontal direc-tion unlike the rigid bracket 7~
Ano-ther ~eature of the magnetic suspe~sion res-ides in that the guide rail 16 is mounted ~or lateral displacements~ This facility makes it possible to en-sure selL-adjustment of the rail 16 with respect to the rail 3 durin~, movement o~ the urlder~rame 6 when the 20 suspension is installed so that requiremen-ts imposed upon accuracy o~ assembly can be lower.
The magnetic suspe~sion shown in Figures 4,5 and 6 functions in the same manner as described above~
'~ha dis-tinction in this case resicles in that ~on-mag-25 netic electrically conducting plates.23 are providedon the stripa 4 to ensure lateral stabili-ty o~ the ùn-derframe 6 a-t hig~l speeds without the rollers 12 en-gagin~; ~he guide rail 3. ,~en the u~ldarlDrame 6 (Figu~
re 6~ ~oves at a high speed (the direction o~ movement i9 shown by arrol~ ?4) mag~etic ~ields alternat-ing in magnitude (see arrows 25) are induced in the front and rear e~d faces of -the under~rame 6 to penetrate the non-ma~netic electrically conducting plate~ 2~ and i~-duce eddy currents therein which7 in cooperation with -the strips 9, Inill cause electrody~arLlic repulsion of the end races o~ -the underframe 6 from the lateral sides olD the guide rail 3 under the action-ol ~orces ~1,F2, F3, F4 ~o as to stabilize the lateral posi-tio~ o~ the under~rame 6, During vertical oscilla-tions of the underframe 6, magnetic ~lux created by the strips 9 and 4 and peue-tratin~ the plates 2~ ~/ill changa i~ magnitude. Eddycurre~ts are thus induced in the plates 23 to i~teract .~ith the strips 9 of the underframe 6 so as to build up a ~orce ~5 (Fio~ure 4~ wLlich is directed oppo~ite to the vector V OL velocity o.~ vertical oscillations o~ the underframe 6.
Therefore, the ~orce F5 will ~uppress vertical oscillations of the underframe 6 thus enhancing its sta bilityO
'~he invention makes it possible to improve re-liabilit~ of the rnagnetic suspension o~ a vshicle in ope-ration and to i~crease its stability and load carrying capacity while reduc.ing metaL weight and facilita-ting - 16 ~

assembly~
This construction of the magne~ic suspension makes it possible -to use perma~ent mar,net~ which do not re-quire power supply thus bringing down operation cost and improvin~ safet~ whereby the field of application o~ the magnetic su~pension is substantially enlarged.

Claims (16)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:-

1. A magnetic suspension for a vehicle for passeng-er and freight transportation along a track, comprising:
- at least one guide rail vertically installed on the track and having lateral sides of a magnetically conducting material;
- an underframe surrounding said lateral sides of said guide rail and having a magnetic system;
- a means for laterally stabilizing the position of said underframe;
- strips of permanent magnets installed on said la-teral sides of said guide rail in horizontally super-posed relationship with one another, said strips having pole facets of alternating polarity;
- said magnetic system of said underframe compris-ing other strips of permanent magnets installed in hori-zontally superposed relationship with one another and having pole facets of alternating polarity, said pole facets facing towards said pole facets of said strips of permanent magnets of the guide rail;
- said strips of permanent magnets being installed on the underframe with a spacing identical to the spac-ing of the strips of permanent magnets of said guide rail;
- said polarities of said pole facets of said strips of permanent magnets of the underframe and guide rail facing toward one another and disposed opposite to each other being different.

2. A magnetic suspension according to claim 1, com-prising :
- said underframe comprising at least one rigid bra-cket having substrates of a magnetically conducting material;
- said strips of permanent magnets being mounted on said substrates.

3. A magnetic suspension according to claim 2, com-prising two guide rails having strips of permanent mag-nets which are installed in horizontally superposed re-lationship with one another;
- another substrate of a magnetically conducting material installed on said underframe between said guide rails;
- strips of permanent magnets installed in, horizon-tally superposed relationship with one another on the lateral sides of said substrate with a spacing identic-al to the spacing of said strips of permanent magnets of said guide rails;
- said strips of permanent magnets which are mounted on said substrate having pole facets with polarities thereof alternating in the vertical direction, said polarities of said pole facets of the strips of perma-nent magnets of the substrate and of the guide rails fa-cing toward one another and disposed opposite to each other being different.

4. A magnetic suspension according to claim 3, com-prising said guide rails, one of said rails being rigid-ly mounted of the track and the other guide rail being laterally displaceable.

5. A magnetic suspension according to claim 19 com-prising plates of a non-magnetic electrically conduct-ing material;
- said plates being installed on said pole facets of said strips of permanent magnets of the guide rail facing toward said underframe.

6. A magnetic suspension according to claim 2, com-prising plates of a non-magnetic electrically conduct-ing material;
- said plates being installed on said pole facets of the strips of permanent magnets of the guide rail facing toward said bracket of the underframe.

7. A magnetic suspension according to claim 4, com-prising plates of a non-magnetic electrically conduct-ing material;
- said plates being installed on said pole facets of said strips of permanent magnets of the guide rails facing toward said substrate and said bracket of the underframe.

8. A magnetic suspension according to claim 4, com-prising plates of a non-magnetic electrically conduct-ing material;
- said plates being installed on said pole facets of said strips of permanent magnets of the guide rails facing toward said underframe.

9. A magnetic suspension according to claim 1, com-prising said strips of permanent magnets made in the form of bars of a magnetically hard material.

10. A magnetic suspension according to claim 2, com-prising said strips of permanent magnets made in the form of bars of a magnetically hard material.

11. A magnetic suspension according to claim 4, comprising said strips of permanent magnets made in the form of bars of a magnetically hard material.

12. Magnetic suspension according to claim 6, com-prising said strips of permanent magnets made in the form of bars of a magnetically hard material.

13. A magnetic suspension according to claim 9, wherein said magnetically hard material is a ferrite.

14. A magnetic suspension according to claim 10, wherein said magnetically hard material is a ferrite.

15. A magnetic suspension according to claim 11, wherein said magnetically hard material is a ferrite.

16. A magnetic suspension according to claim 12, wherein said magnetically hard material is a ferrite.