SE128309C1

SE128309C1 -

Info

Publication number: SE128309C1
Authority: SE
Publication date: 1950-01-01

Description

KLASS 21 g:41,01 BEVIDAT DEN 22 MARS 19 PATENTTID FRAN DEN 26 JUNI 19 PUBLICERAT DEN 30 MA] 19 Hartill en ritning. CLASS 21 g: 41.01 PROVIDED ON 22 MARCH 19 PATENT PERIOD FROM 26 JUNE 19 PUBLISHED ON 30 MAY] 19 A drawing.

GENERAL RAILWAY SIGNAL COMPANY, ROCHESTER, N. Y., AMERIKAS FORENTA STATER. GENERAL RAILWAY SIGNAL COMPANY, ROCHESTER, N. Y., UNITED STATES OF AMERICA.

Elektromagnetiskt polariserat rel.& Uppfinuare: G. E. Duffy Sr. Electromagnetically Polarized Rel. & Inventor: G. E. Duffy Sr.

Prioritel begard frill:, den 6 ittni 1944 (Amerikas forenta stater). Priority requested frill :, 6 ittni 1944 (United States of America).

Uppfinningen avser ett elektromagnetiskt polariserat rela, yars magnetiska krets formagnetiseras medelst en permanentrnagnet och vars ankare vid stromlost rela icke befinner sig i tillslaget tillstand. The invention relates to an electromagnetically polarized relay, whose magnetic circuit is pre-magnetized by means of a permanent magnet and whose armature in the event of a powerless relay is not in the on-state.

Vid namnda formagnetiserade rela ingar permanentmagneten i magnetkretsen pa sa.- dant satt, att det magnetflode, som den alstrar, och det flode, som alstras av strommen i magnetiseringsspolen, gemensamt genomstromma den delen ay den magnetiska kretsen, som bestar av polskorna, luftgapet och ankaret. Beroende pa stromriktningen i magnetiseringsspolen aro dessa falt antingen riklode i samma eller i motsatt riktning mot varandra. I det form fallet är en svag magnetiseringsstrom tillracklig for att attrahera ankaret, medan i det andra fallet mycket kraftiga strOmmar erfordras fOr att payerka ankaret, emedan i detta fall det fait, som attraherar ankaret, har motsatt riktning som det av permanentmagneten alstrade faltet. In the case of said pre-magnetized relations, the permanent magnet in the magnetic circuit in such a way that the magnetic flux which it generates and the flux generated by the current in the excitation coil jointly flow through the part of the magnetic circuit which consists of the pole shoes, the air gap and the anchor. Depending on the current direction in the excitation coil, these fields are either rich in the same or in the opposite direction to each other. In that case a weak excitation current is sufficient to attract the armature, while in the other case very strong currents are required to charge the armature, since in this case the fact which attracts the armature has the opposite direction as the field generated by the permanent magnet.

Det ãr Onskvart, att fOrhallandet mellan den stromstyrka i normal riktning, som erfordras for att attrahera ankaret, och stromstyrkan i motsatt riktning mot den som beho-vs for att attrahera ankaret, är sa stort som mOjligt, emedan harigenom basta skydd erhalles mot relatillslag genom strommar i mot-salt riktning, vilLa strommar kunna uppsta genom tillfalligheter, sisoni askyader, kortslutningar eller montagefel. Speciellt yid jarnyagsd.riti, dar funktionsf el av relder icke en-dust kunna astadkomma materiella skador utan ayen olycksha.ndelser, Oro dessa forhallanden av sarskilt stor betydelse. It is desirable that the ratio between the current in the normal direction required to attract the armature and the current in the opposite direction to that required to attract the armature is as large as possible, since the best protection is obtained against relative beats by currents in the opposite-salt direction, currents can arise due to coincidences, sisoni ashyades, short circuits or assembly errors. Especially yid jarnyagsd.riti, where the malfunction of the rails can not only cause material damage without ayen accidents, These conditions are of particular importance.

Vid ett dylikt relä maste permanentmagnetmaterial med stor koercitiykraft anyandas, emedan det ay den normala magnetiseringsstrommen alstrade faltet verkar demagnetiserande pa permanentmagneten. Ett dylikt: materials remanens Or i allmanhet ganska liten, sh att det Or nOdvandigt att anvanda permanentmagneter med tamligen stor tvarsektionsarea. In such a relay, permanent magnet material with high coercive force must be used elsewhere, since the field generated by the normal excitation current has a demagnetizing effect on the permanent magnet. Such a: material remanens Or in general quite small, sh that it Or necessary to use permanent magnets with rather large cross-sectional area.

Uppfinningen gör det mojligt att reducera den mojliga aymagnetiserande effektens storlek i det stromforande relaet, -vilken effekt Or ganska stor t. o. m. om ingen magnetiserande strom fdrekommer, och att erhalla maximiforhallandet mellan den magnetiserande stromstyrkan i den normala riktningen fOr att attrahera ankaret och stromstyrkan i motsatt riktning, sO att funktion under en felsignals inverkan unchikes. The invention makes it possible to reduce the magnitude of the possible magnetizing power in the current-carrying relay, which power is quite large even if no magnetizing current occurs, and to obtain the maximum ratio between the magnetizing current in the normal direction to attract the armature and the current in the opposite direction. , so that function under the influence of an error signal unchikes.

Enligt uppfinningen innehaller ett elektromagnetiskt polariserat rad, som är formagnetiserat medelst en perrnanentmagnet och vars ankare vid stromlost reld icke dr tillslaget, en ma.gnetisk shunt parallellt med per- manentmagneten, vilken shunt tillsammans med magnetiseringsspolens karna bildar en sluten magnetisk krets, som i sin helhet magnetiseras av permanentmagneten, sa att det magnetiska tillstandet ligger i narheten av magnetiseringskurvans krok. According to the invention, an electromagnetically polarized row, which is pre-magnetized by means of a permanent magnet and whose armature in the event of a power failure does not turn on, contains a magnetic shunt parallel to the permanent magnet, which shunt together with the cores whole is magnetized by the permanent magnet, so that the magnetic state lies near the hook of the magnetization curve.

Anvandningen av en parallellt med permanentmagneten anordnad magnetisk shunt medf Or, att den avmagnetiserande effekten Or mycket mindre On ifall endast magnetiseringsspolens karna befinner sig mellan permanentrnagnetens poter, emedan med hansyn till spolen denna karna alltid initste vara mycket langre an den kortaste magnetshunten, och eftersom permanentmagneten bestar av en stang, ligger den med hela sin langd mot magnetshunten. Tack vare den svaga avinagnetiseringseffekten kan man i stor utstrackning valja bland kanda magnetiska material. &Isom redan namnts, formagnetiseras bade magnetshunten och magnetiseringsspolens karna av permanentmagneten intill narheten av magnetiseringskurvans krok.. Della fakturns betydelse for reldets funktion ()eh de fordelar, som harigenom fas jamfort med kanda konstruktioner, framga ay foljande. The use of a magnetic shunt arranged in parallel with the permanent magnet means that the demagnetizing effect Or is much smaller if only the cores of the excitation coil are between the legs of the permanent magnet, since with respect to the coil this cores always tend to be much longer than the shortest magnetic shunt. consists of a rod, it lies with its entire length against the magnetic shunt. Thanks to the weak de-magnetization effect, one can to a large extent choose among known magnetic materials. & As already mentioned, both the magnetic shunt and the magnetizing coil cores are pre-magnetized by the permanent magnet next to the hook of the magnetizing curve. The significance of the invoice for the function of the fire () eh the advantages, which are thus compared with known constructions, are as follows.

Sasom hos alla med en permanentmagnet formagnetiserade relder Or den normala magnetiseringsstrommens riktning sadan, att det av denna strOni i spolkarnan alstrade faltet 2— — fir motsatt det av permanentrnagneten alstrade faltet. Det av den stromfarande spolen alstrade magnetflodet fordelar sig pa de med ankaret och luftgapet i serie anordnade polskorna och permanentmagneten. Men speciellt material med stor permanentmagnetisk koercitivkraft har mycket liten permeabilitet (pa grund av de tvá magnetiseringsriktningarna och dven emedan materialet icke är magnetiserat), sit att innan det hela av magnetiseringsstrommen alstrade magnetfladet genomstrommar luftgapet, oberoende av magnetiseringsstrommens riktning. Harm' framgar, att forhallandet mellan den normala magnetiseringsstromstyrkan och den motsatt riktade stromstyrkan, medelst vilken ankaret attraheras, helt och hallet bestammes av luftgapets formagnetisering. I korthet, eftersom luftgapet är formagnetiserat medelst permanentmagneten, är den strom, som passerar i motsatt riktning som den, vid vilken ankaret attraheras, icke mera an tre ganger storre an den normala stroll/men. I korthet, eftersom luftgapet ar formagnetiserat inedelst perma- nentmagneten upp till av det for attra- heringens astadkommande nodvandiga magnetflodet, fir den strain, som passerar i mot-salt riktning som den, yid vilken ankaret attraheras, icke mera an tre ganger storre an den normala strommen; ifall magnetisering- en utgar 7är den sju ganger storre. Des- sa siffror anges endast for att visa forhallandena och aro icke pa nagot satt bestammande. Emedan man yid formagnetiseringen ãr bun-den vid vissa granser for att undvika, att ankaret forblir tillslaget efter den magnetiserande striimmens brytning, kan della forhallande dock aldrig bli mycket stort. As in the case of all the pre-magnetized relays, the direction of the normal excitation current is such that the field generated by this current in the coil core is 2 - - opposite the field generated by the permanent magnet. The magnetic flux generated by the current coil is distributed among the pole shoes and the permanent magnet arranged in series with the armature and the air gap. But especially materials with a large permanent magnetic coercive force have very little permeability (due to the two magnetization directions and also because the material is not magnetized), that before the entire magnetic surface generated by the magnetizing current flows through the air gap, regardless of the direction of the magnetizing current. Harm 'shows that the ratio between the normal excitation current and the opposite current, by means of which the armature is attracted, is entirely determined by the pre-magnetization of the air gap. In short, since the air gap is pre-magnetized by the permanent magnet, the current passing in the opposite direction to that at which the armature is attracted is no more than three times larger than the normal beam / s. In short, since the air gap is pre-magnetized at the bottom of the permanent magnet up to the required magnetic flux produced by the attraction, the strain passing in the opposite salt direction as the one to which the anchor is attracted is not more than three times larger than that of the anchor. normal currents; if the excitation emits 7, it is seven times larger. These figures are given only to show the circumstances and are not in any way decisive. However, since the magnetization is bound at certain boundaries to avoid the armature remaining turned on after the break of the magnetizing strip, the delay can never be very large.

I ett relit enligt uppfinningan astadkommer samma stromstyrka hos de magnetiserande motsatt riktade strommarna icke samma and-ring av magnetflodet i magnetiseringsspolens karna, och, beroende pa strommens riktning, passeras luftgapet av en olika stor del av delta flOde. Delta beror darpa, att bade magnetiseringsspolens karna och magnetshunten formagnetiseras intill magnetiseringskurvans lira. Den normala magnetiserande strommen, som motverkar det i spolkarnan redan befintliga magnetfladet, astadkommer dar en storre andring i magnetflodet an samma strom i motsatt riktning, emedan permeabiliteten icke ar lika stor far de hada stromriktningarna. Vid vanliga magnetiska amnen Or denna differens storst i narheten av magnetiseringskurvans krok. For det av den normala magnetiseringsstrommen alstrade magnetflodet Or magnetshuntens reluktans tillrOckligt stor, enar I derma riktning shunten magnetiseras intill narhetert av mattningsgransen, sa att endast en liten del av det flode, som alstras av magnetiseringsstrommen, passerar denna shunt, medan resten, med undantag av den del, som gar igenom permanentmagneten, pas serar luftgapet. Den normalt riktade magnetiseringsstrommen, som Or nodvandig for att attrahera ankaret, blir saledes endast nagot stone an i fall magnetshunten icke finnes. Eftersom strommen i magnetiseringsspolen gar i motsatt riktning, Or reluktansen i derma spoles karna daremot tamligen stor, emedan man da. nar en punkt, som kan befinna sig tillrackligt langt borta fran magnetiseringskurvans mattade del. Far det alstrade flodet är reluktansen i den parallellt med permanentmagneten anordnade shunten tillrackligt liten, eftersom detta node motverkar det redan befintliga floclet. En ganska stor del av det av magnetiseringsspolen dO alstrade flatlet passerar alltsa magnetshunten. Av dessa Overlaggningar framgar, att forhallandet mellan stramstyrkan i den riktning, sorn erfordras f Or att attrahera ankaret, och stromstyrkan i den andra riktningen blir storre On am magnetshunten icke skulle finnas. In a relit according to the invention, the same current strength of the magnetizing oppositely directed currents does not cause the same change of the magnetic flux in the cores of the excitation coil, and, depending on the direction of the current, the air gap is passed by a different portion of delta flux. Delta is due to the fact that both the cores of the excitation coil and the magnetic shunt are pre-magnetized next to the lira of the excitation curve. The normal magnetizing current, which counteracts the magnetic surface already present in the coil core, causes a greater change in the magnetic flux than the same current in the opposite direction, because the permeability is not as great for the two current directions. In the case of ordinary magnetic subjects, this difference is greatest in the vicinity of the hook of the excitation curve. For the magnetic flux generated by the normal excitation current Or the reluctance of the magnetic shunt is sufficiently large, in this direction the shunt is magnetized adjacent to near the mating boundary, so that only a small part of the flux generated by the excitation current passes this shunt, while the rest, with the exception of the part which passes through the permanent magnet fits the air gap. The normally directed excitation current, which is necessary to attract the armature, thus becomes only a stone in case the magnetic shunt does not exist. Since the current in the excitation coil goes in the opposite direction, the reluctance in these coils, on the other hand, is quite large, since one then. reaches a point which may be far enough away from the matte portion of the excitation curve. For the generated current, the reluctance of the shunt arranged parallel to the permanent magnet is sufficiently small, since this node counteracts the already existing floc. A fairly large part of the flat generated by the excitation coil dO thus passes the magnetic shunt. From these Overlocations it appears that the ratio between the current in the direction required to attract the armature and the current in the other direction becomes greater On the magnetic shunt would not exist.

Relaets verkningssatt har enligt ovanstaende forklarats med hjalp av formagnetiseringen till en punkt i narheten av magnetiseringskurvans krOk och beror darpa, att permeabiliteten Or olika stor i de hada riktningarna. Eftersom magnetiseringskurvan icke bestar av tva raka linjer, som skara varandra, utan av tva raka linjer, som f8rena sig i en stor bage, galler det att formagnetiseringen kan forskjutas till en punkt ovanfar eller nedanfar magnetiseringskurvan for den handelse att permeabiliteten skulle vara densamma i hada riktningar. Om saledes t. ex. stramstyrkan i den normala riktningen Or tillrackligt stor, kan magnetshunten formagnetiseras t. ex. till en punkt langt under magnetiseringskurvan. According to the above, the effect of the rela has been explained with the aid of the pre-magnetization to a point near the bend of the magnetization curve and is due to the fact that the permeability is different in the had directions. Since the magnetization curve does not consist of two straight lines separating each other, but of two straight lines merging into a large bag, it is important that the magnetization can be shifted to a point above or below the magnetization curve in order for the permeability to be the same in directions. If thus e.g. the tensile strength in the normal direction Or sufficiently large, the magnetic shunt can be pre-magnetized e.g. to a point far below the excitation curve.

Jamfort med formagnetiserade relb.er utan magnetisk shunt ager react enligt uppfinningen dessutom en annan fordel. Ifall permanentmagneten av n4ot skaI skulle Tar avmagnetiserad, verkar reldet som neutralt reld, vars magnetiseringsstromstyrka Or densamma i hada riktningar, varvid denna strainstyrka bestammes av ovannamnda forhallande. Enar detta forhallande Or mycket storre for ett rela med magnetisk shunt enligt uppfinningen, Or det praktiskt taget uteslutet, att ett avmagnetiserat rela, som utforts enligt uppfinningen, slar till under inverkan av strommen, vilken riktning denna On ma ha. Compared with pre-magnetized relb.s without magnetic shunt ager react according to the invention also has another advantage. If the permanent magnet of n4ot were to become demagnetized, the fire acts as a neutral fire, the excitation current of which is the same in different directions, this strain strength being determined by the above-mentioned relation. If this ratio is much larger for a relay with a magnetic shunt according to the invention, it is practically impossible for a demagnetized relay, which is made according to the invention, to strike under the influence of the current, which direction this On ma ha.

Den magnetiska shuntens tvarsektionsarea valjes foretradesvis ungefar lika stor som den hos magnetiseringsspolens karna. Vid anvandning av gott permanentmagnetiskt material dimensioneras permanentmagnetens tvarsektionsarea sa, att den Or ungefar fern ganger sa. stor som tvarsektionsarean for magnetiseringsspolens karna. The cross-sectional area of the magnetic shunt is preferably selected to be approximately equal to that of the cores of the excitation coil. When using good permanent magnetic material, the cross-sectional area of the permanent magnet is dimensioned so that it Or approximately four times said. as large as the cross-sectional area of the excitation coil tubes.

Den magnetiska shuntens avlagsnande skulle kunna medfora, att den svaga normalt riktade str8mmen i magnetiseringsspolen kan vara tiliracklig for att attrahera ankaret eller — —3 for att kvarhalla detta oxen efter stromavbrott. For att undvika ett sadant icke onskvart verkningssatt hos ett rela enligt uppfinningen ar den magnetiska shunten anordnad pa sadant satt, att den endast kan borttagas fran den magnetiska kretsen tillsammans med eller efter permanentmagneterna. The removal of the magnetic shunt could mean that the weak normally directed current in the excitation coil may be insufficient to attract the armature or - —3 to retain this ox after a power failure. In order to avoid such an undesirable mode of action of a relay according to the invention, the magnetic shunt is arranged in such a way that it can only be removed from the magnetic circuit together with or after the permanent magnets.

Nedanstdende beskrivning i samband med bifogade ritning begransas icke till det angivna exemplet och visar, hue uppfinningen kan utfOras, varvid de detaljer, som framga ur beskrivningen och ritningen, utgora en del av denna uppfinning. The following description in connection with the accompanying drawing is not limited to the example given and shows how the invention can be carried out, the details appearing from the description and the drawing forming part of this invention.

I fig. 1 visas ett rela enligt uppfinningen i perspektiv, medan fig. 2 ar en tvarsektion genom fastanordningen for en av polskorna vid spolkarnan och genom permanentmagnetens utstaende del. Fig. 1 shows a relay according to the invention in perspective, while Fig. 2 is a cross section through the fastening device for one of the pole shoes at the spool core and through the protruding part of the permanent magnet.

I fig. 1 visas karnan till relaets magnetiseringsspole, vilken karna 1 fir U-formad och vars skanklar aro forbundna med avlanga polskor 2 och 3. Dessa polskors plana sidoytor aro forbundna med ett ankare 4. Ankaret 4 ar forsett med tvd korta axlar 5, som aro vridbart lagrade i passande lager 6. Ankaret 4 uppbar dessutom tva kontaktarmar 7, som aro forsedda med arbetskontakter och vilokontakter 8 resp. 8'. Pd. karnans 1 hada sidor aro klamstycken 9 och 9' fasta pa det i fig. 2 visade sattet; de are tillsammans med polskorna 1 och 2 fasta pa karnan 1. Sasom av ritningen framgar, dr for detta dndamal klamstycket 9' anordnat vid en plan del pa karnan 1 och aro bada genomborrade, sa att en skruv 15' kan inforas i borrhalet till det gangade halet i polskon 3. Karnan 1 och polskon 3 aro f8rsedda mad delar, som ligga an mot varandra. Del racker med att draga fast skruven 15' fOr att skruva ihop 9', 1 och 3. Fig. 1 shows the core of the magnetizing coil of the relay, which core 1 is U-shaped and whose shanks are connected to elongated pole shoes 2 and 3. The flat side surfaces of these pole shoes are connected to an anchor 4. The anchor 4 is provided with two short shafts 5, which are rotatably mounted in suitable bearings 6. The armature 4 also carried two contact arms 7, which are provided with working contacts and rest contacts 8 and 8, respectively. 8 '. Pd. the sides of the core 1 are clamped pieces 9 and 9 'fixed in the manner shown in Fig. 2; they are together with the pole shoes 1 and 2 fixed to the core 1. As can be seen from the drawing, for this purpose the clamping piece 9 'is arranged at a flat part of the core 1 and is both pierced, so that a screw 15' can be inserted into the drill tail to the walked the tail in the pole shoe 3. Karnan 1 and pole shoe 3 are f8s provided with parts, which lie against each other. Divide racks by tightening the screw 15 'to screw together 9', 1 and 3.

Mellan klamstyckena 9 och 9' befinna sig framtill en permanentmagnet 16 och baktill en permanentmagnet 17, vilka upphara var sin magnetiska shunt 18 resp. 19. Permanentmagneterna och de magnetiska shunterna are exakt inpassade mellan klamstyckena 9 och 0' och Ore deras andytor plana och glattade for att nedbringa reluktansen till ett Permanentmagneterna och deras shunter kvarhallas vertikalt medelst vinklarna 10 och 11 resp. 12 och 13. Dessa vinklar aro fasta vid klamstyckena med sma skruvar. Between the clamping pieces 9 and 9 'there are at the front a permanent magnet 16 and at the rear a permanent magnet 17, which each terminate its magnetic shunt 18 and 18, respectively. 19. The permanent magnets and the magnetic shunts are precisely fitted between the clamp pieces 9 and 0 'and Ore their face surfaces are flat and smoothed to reduce the reluctance to a The permanent magnets and their shunts are retained vertically by the angles 10 and 11 respectively. 12 and 13. These angles are fixed to the clamp pieces with small screws.

Karnans 1 magnetiseringsspole bestar av tva halfter 20 och 21. Ett holje 14, som omger permanentmagneterna och magnetiseringsspolarna, har till storre delen utelamnats ritningen for all tydligare visa anordningen. The excitation coil of the core 1 consists of two halves 20 and 21. A housing 14, which surrounds the permanent magnets and the excitation coils, has for the most part been omitted from the drawing for a clearer display of the device.

Bokstaverna N och S pa permanentmagneterna ange nordpolen och sydpolen. Ankaret har sa instants, att det far normal magnetiseringsstrom erforderliga luftgapet erhalles, varvid ankaret 4 dessutom Or forsett med icke magnetiska avstandsbrickor eller dylikt for att forhindra, att relaet »klibbar», d. v. s. att ankaret icke slappes vid stromavbrott; eftersom en sadan anordning är mycket van-hg, visas den icke a ritningen. The letters N and S on the permanent magnets indicate the North Pole and the South Pole. The armature has such an instant that the air gap required for normal excitation current is obtained, the armature 4 also being provided with non-magnetic spacers or the like to prevent the relay from "sticking", i.e. that the armature is not released in the event of a power failure; since such a device is very common, it is not shown in the drawing.

Karnan 1, polskorna 2 och 3, ankaret 4 samt klamstyckena 9 och 9' besta av nagot lampligt ferromagnetiskt material med hog parmeabilitet, t. ex. siliciumjarn. De magnetiska shunterna 18 och 19 besta likaledes av ferromagnetiskt material, vars permeabilitet emellertid icke behover vara lika stor som ovannamnda organs material. Permanentmagneterna 16 och 17 kunna utforas av material med stor permanentmagnetisk koercitivkraft, t. ex. av ett material, som i handeln Or kant under namnet: »Black Streak Alnico». The core 1, the pole shoes 2 and 3, the anchor 4 and the clamp pieces 9 and 9 'consist of some suitable ferromagnetic material with high parmeability, e.g. silicon iron. The magnetic shunts 18 and 19 likewise consist of ferromagnetic material, the permeability of which, however, need not be as great as the material of the above-mentioned members. The permanent magnets 16 and 17 can be made of materials with a large permanent magnetic coercive force, e.g. of a material, as in the trade Or kant under the name: «Black Streak Alnico».

Sasom redan omnamnts, aro permanentmagneterna 16 och 17 magnetiserade i samma riktning, sa att nordpolerna befinna sig intill klamstycket 9'. Permanentmagneternas totala tvarsektionsarea Or omkring den femdubbla av spolkarnans 1 tvarsektionsarea. De magnetiska shunternas 18 och 19 totala tvarsektionsarea Or ungefar densamma som karnornas. Shunterna 18 och 19 liksom magnetiseringsspolens karna 1 magnetiseras av permanentmagneten till narheten av magnetiseringskurvans kr81(ning. As already mentioned, the permanent magnets 16 and 17 are magnetized in the same direction, so that the north poles are located next to the clamp piece 9 '. The total cross-sectional area of the permanent magnets Or is about five times the cross-sectional area of the coil core 1. The total cross-sectional area Or 18 of the magnetic shunters Or is approximately the same as that of the cores. The shunts 18 and 19 as well as the cores 1 of the excitation coil are magnetized by the permanent magnet to the vicinity of the excitation curve kr81 (ning).

Claims

Patent claim:

1. An electromagnetically polarized relay which is pre-magnetized by means of a permanent magnet and whose armature is not attracted in the current state, characterized in that the permanent magnet is parallel to a magnetic shunt which together with the cores of the magnetizing coil forms a closed magnetic circuit magnetized to the vicinity of the hook in the magnetization curve of the material used.

Polarized steering wheel according to claim 1, characterized in that the permanent magnet is located outside the magnetic circuit, which consists of the magnetic shunt and the cores of the magnetizing coil.

3. A polarized relay according to claim 1 or 2, characterized in that the cross-sectional area of the permanent magnet is approximately equal to four times the cross-sectional area of the magnetizing coil cores.

4. A polarized relay according to claim 1, 2 or 3, characterized in that the cross-sectional area of the cores of the magnetizing coil is approximately equal to the cross-sectional area of the magnetic shunt.

5. Polarized relay according to any one of the foregoing patent claims, characterized in that the permanent magnet is arranged as a fixed device for the magnetic shunt on such a salt that the shunt can only be removed if the permanent magnet is removed or removed. Stockholm 1950. Rena Poker. P. A. Norstedt aSmner 500089