CN101061559A - Switching equipment comprising an electromagnetic trip device - Google Patents
Switching equipment comprising an electromagnetic trip device Download PDFInfo
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- CN101061559A CN101061559A CNA2005800399010A CN200580039901A CN101061559A CN 101061559 A CN101061559 A CN 101061559A CN A2005800399010 A CNA2005800399010 A CN A2005800399010A CN 200580039901 A CN200580039901 A CN 200580039901A CN 101061559 A CN101061559 A CN 101061559A
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- release
- armature
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- switching device
- shape memory
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
- H01H71/145—Electrothermal mechanisms using shape memory materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
- H01H33/56—Gas reservoirs
- H01H33/563—Gas reservoirs comprising means for monitoring the density of the insulating gas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/547—Combinations of mechanical switches and static switches, the latter being controlled by the former
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/12—Shape memory
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
- H01H2071/407—Combined electrothermal and electromagnetic mechanisms the thermal element being heated by the coil of the electromagnetic mechanism
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
- H01H2300/034—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H using magnetic shape memory [MSM] also an austenite-martensite transformation, but then magnetically controlled
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/2454—Electromagnetic mechanisms characterised by the magnetic circuit or active magnetic elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/2463—Electromagnetic mechanisms with plunger type armatures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
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Abstract
Feedback bandwidth may be reduced in a closed loop MIMO system by factoring non essential information out of a beamforming matrix.
Description
Technical field
The present invention relates to a kind ofly by claim 1 switching device as described in the preamble, this switching device has shell and at least one and comprises the contact site of fixed contact therefor and movable contact and have release coil and discharge the electromagnetism release of armature.In addition, the invention still further relates to by claim 18,20 and 22 described uses with material of magnetic shape memory effect, this material is used in the electromagnetism release that is used for switching device, and wherein this release has release coil and discharges armature.
Background technology
The switching device of described type such as line protection switch or motor protecting switch on, described electromagnetism release is used at the current path that is occurring interrupting under the situation of short circuit current between input and output.At the disclosed electromagnetism release of prior art today, as such as illustrated in DE 10,126 852 C1 or DE 100 10 093 A1, all carry out work in this case according to such principle, promptly discharge armature occur short circuit current the time be placed among the motion of magnetic core direction, and the moving contacting piece on the described contact site is pushed open from fixed contact therefor by the push rod among being in effective the connection with it at the armature of release described in the process of this motion, thereby disconnected described contact site thus.Disclosed electromagnetism release comprises usually by thread coil of the metal of spiral wound and magnetic core for this reason, this magnetic core with outside the yoke of this coil encirclement is fixedlyed connected and is engaged on this coil inside.Described release armature is configured to pivoted armature or is configured to plug-in type armature, and wherein plug-in type armature is in the inside of described coil equally.Described armature keeps spacing by means of compression spring and magnetic core in inactive state.If short circuit current flows through described release coil, the reset force that the magnetic field that produces in this case of so described release coil will make described release armature overcome described compression spring moves towards described magnetic core.After cutting-off of short-circuit electric current, described armature is got back to again in its home position by the reset force of compression spring.
In today, the structure of the electromagnetism release expense that expense is very big and generation is very high in this case is because must make and assemble many parts with very narrow tolerance.
Disclosed in the prior art hot release is used the releasing member work of being made by thermo bimetal or hot shape memory metal usually, and described releasing member is such as realizing as crooked crossbeam or lock collar.The hot release of a kind of thermo bimetal of having-crooked crossbeam is disclosed in DE 43 00 909 A1.
So realize hot and magnetic release in today, thereby be every kind of element that discharges principle manufacturing oneself.At this, second minute-release of first minute hot-release and magnetic is assembled, wherein said first minute hot-release has the heat release armature of being made by thermo bimetal or hot shape memory metal as top mentioning, and second minute-release of described magnetic has the release armature of release coil and magnetic.In DE 42 42 516 A1, disclose a kind of hot-the composite type release of magnetic, branch-release that wherein said hot branch-release is configured to lock collar and described electromagnetism then constitutes by impacting armature-release.But also can make two releases that separate here, they are combined into complicated assemblies according to mode spatially close to each other.
Therefore described hot and being configured in of release electromagnetism still will be spent a lot of expenses today and be produced very high cost, because must make two kinds of complete releases and must combination with one another together, wherein to make and manyly have the part of very narrow tolerance and fit together.
Nowadays the failure current protection switch of version has the electromagnetism release, and this release majority is the permanent magnetism release and has the U-shaped yoke, pivoted armature and this U-shaped yoke acting in conjunction at this.Described pivoted armature is connected rotationally with one of them yoke support arm in the zone of one end thereof, and in contrast, another end of described pivoted armature is covered with the end face of another root yoke support arm.By means of spring, on the disconnection direction, load for described pivoted armature enduringly; For described yoke has set in described yoke the permanent magnet that produces magnetic flux, described yoke remains on described armature in the certain location, armature described in this position in other words pivoted armature be covered with two end faces of described yoke support arm.In addition; on yoke, arranged a coil; this coil produces magnetic flux in described yoke inside when breaking down electric current; this magnetic flux is offset magnetic force basically; make the elastic force of spring that described pivoted armature is placed open position; activate a latching device thus, utilize this latching device that described failure current protection switch is placed open position.For fear of between the end face of described pivoted armature and described yoke support arm, the bonding process occurring; described release is packed in the shell of a sealing; wherein push rod is stretched from this shell, and this push rod cuts off and close thus the described failure current protection switch of cut-out with the latching device of described failure current protection switch.
Summary of the invention
Therefore, task of the present invention is to install and to make with cheaper cost thus the switching device of described type more simply.
This task for pure electromagnetism short circuit-release by a kind of switching device with the described characteristic features of claim 1, by the use of the material with magnetic shape memory effect in switching device by the described characteristic features of claim 18, and by being resolved in the use of switching device by having of the described characteristic features of claim 20 material magnetic shape memory effect, that be used for short circuit current release.
Therefore, by the present invention, described release armature is made of the material with magnetic shape memory effect, wherein under short-circuit conditions under the influence in the magnetic field of described release coil described release armature deform and described contact site disconnected.Especially described release armature can be made of a kind of ferromagnetic shape memory alloy of being made by nickel, manganese and gallium.
When using magnetic shape memory alloy, can in martensitic phase, cause change of shape by the transition between two crystal structure schemes of twin crystal structure, wherein said transition between crystal structure is controlled by the magnetic field of outside.Therefore these materials are called magnetic shape memory alloy or " Magnetic Shape Memory Alloys (magnetic shape memory alloy) " (MSM).
The ferromagnetic shape memory alloy of magnetic shape memory alloy preferable configuration for making by nickel, manganese and gallium.More accurate about based on the structure of the ferromagnetic shape memory alloys of nickel, manganese and gallium and the explanation of action principle, such as can from WO 98/08261 and WO 99/45631, obtaining.
Can determine by corresponding alloying component, reach maximum expansion during magnetic field externally how directed; Can be vertically or such as described magnetic field transverse to the MSM-material, be used to the expansion that reaches maximum.
With the MSM-material externally the change of shape that realizes down of the action of a magnetic field can be linear expansion, bending or reverse (distortion).
The invention has the advantages that, greatly simplifying by the structure of the above magnetic release of switching device of the present invention.Described by magnetic release of the present invention with compare by the magnetic release of prior art can be more compact and save ground, space and realize.Also can make the switching device that has by magnetic release of the present invention by of the present invention more simple and more compactly thus.
Another advantage by switching device of the present invention is exactly the quick characteristic that magnetic discharges.Needn't quicken inertia mass at this, not carry out because the change of shape that magnetic shape memory effect causes almost has tardily.
When bigger length variations occurring, because ferromagnetic shape memory alloy has high magnetic-mechanical energy conversion coefficient, so can reach very high adjusting power, this point is also very favourable.
On the described switching device bright by this, the described magnetic field that is used for electromagnetism release is produced by the coil that flows through through electric current.
Describedly can be configured to elongated parts by the metal release armature of ferromagnetic shape memory, the direction at its longitudinal axis of the influence of magnetic field lower edge of described release coil expands these parts under the situation of short circuit current occurring.
Described release armature also can be configured to the crossbeam shape, and bend under the influence that occurs under the situation of short circuit current in the magnetic field of described release coil, perhaps this release armature can be configured to helical form and the direction at the influence of magnetic field lower edge of described release coil spiral longitudinal axis expands under the situation of short circuit current occurring.In described martensitic phase, the change of shape that magnetic causes is directly proportional with coil current.
Big advantage by switching device of the present invention is that under the situation of using the metal release armature by ferromagnetic shape memory, the structure of described electromagnetism release is very simple.This release only comprises coil and described release armature basically.Described release armature this can on its second end with among push rod is in effective the connection.But compare with release, saved described magnetic core and compression spring by prior art.And it is described simpler than the supporting structure that is used in the release armature on traditional release by the supporting structure by the metal release armature of ferromagnetic shape memory of the present invention.Because on traditional release, discharging armature must support easily movably, discharge armature in contrast on by release of the present invention and no longer comprise the part of any activity and be bearing in regularly on the first end in preferred embodiment that wherein it is expanding under the effect in magnetic field on the second end of own activity a kind of.Very favourable at this especially a kind of execution mode, in the bearing that described in this embodiment release armature is fixed on fixing first end with shell is connected.
Big advantage by switching device of the present invention is, described release coil and describedly set relation by the space between the metal release armature of ferromagnetic shape memory and can require to be complementary with various how much of switchgear housing inside.For example, a kind of preferred embodiment in, described release armature can be released coil and surround.According to another preferred embodiment, described release armature can be installed in the place of the outside of coil near coil.
The space utilization that can realize ideal in the inside of described switchgear housing thus, this just makes the structure of switching device littler and make its cost more cheap thus.
Described electromagnetism release needs the less lower part of requirement to self dimensional accuracy, and therefore has by the installation of the electromagnetism release of the metal release armature of ferromagnetic shape memory also more simply and more cheap.
A kind of and the structure that is used for the release that short circuit discharges very similar design scheme also can be used in failure current protection switch.At this, the described element of being made by the material with magnetic shape memory effect directly acts on latching device, the contact lever of described failure current protection switch and the coupling of this latching device.Be used for described basic design on the release of short circuit also is applicable to failure current protection switch on this meaning release, energy is smaller as secondary voltage in other words wherein only to should be noted that the voltage that exists on described coil.
In addition, this task is by a kind of switching device with claim 1 and 2 described characteristic features, by the use of material in switching device by the knockdown hot and magnetic shape memory effect of having of the described characteristic features of claim 12, and by by the described characteristic features of claim 14 have composite type hot and magnetic shape memory effect, be used for the material that short circuit current discharges and overcurrent discharges and solve in the use of switching device.
Therefore, have composite type material hot and magnetic shape memory effect and make by a kind of by release armature of the present invention, wherein not only deform, and the contact site is disconnected at described release armature under the influence that occurs under the situation of short circuit current in the magnetic field of described release coil but also under the influence that raises of the temperature that is causing because of overcurrent.Especially described release armature can be made by a kind of ferromagnetic shape memory alloy of being made by nickel, manganese and gallium.
When using magnetic shape memory alloy, in martensitic phase, can cause change of shape because of the transition between two kinds of crystal structure schemes of twin crystal structure, wherein the transition between described crystal structure scheme is controlled by the magnetic field of outside.Therefore these materials are called magnetic shape memory alloy or " Magnetic Shape Memory Alloys (magnetic shape memory alloy) " (MSM).
The ferromagnetic shape memory alloy of magnetic shape memory alloy preferable configuration for making by nickel, manganese and gallium.More accurate about based on the structure of the ferromagnetic shape memory alloys of nickel, manganese and gallium and the explanation of action principle, such as can from WO 98/08261 and WO 99/45631, obtaining.
Other preferred design of the present invention and improvement project and other advantage can obtain from other dependent claims.
Description of drawings
Five kinds of embodiment of the present invention shown in the drawings, and followingly by means of accompanying drawing the present invention and other preferred design of the present invention are explained in detail and illustrate.Wherein:
Fig. 1 is the schematic diagram during first execution mode by switching device of the present invention remains static, this switching device have clavate, by the metal release armature of ferromagnetic shape memory, this release armature is arranged in the inner room of release coil,
Fig. 2 is that first execution mode by Fig. 1 is in the schematic diagram in the release condition,
Fig. 3 is the schematic diagram during second execution mode by switching device of the present invention remains static, this switching device have clavate, by the metal release armature of ferromagnetic shape memory, this release armature is arranged in the next door of release coil,
Fig. 4 is that second execution mode by Fig. 3 is in the schematic diagram in the release condition,
Fig. 5 is the schematic diagram during the 3rd execution mode by switching device of the present invention remains static, this switching device have be configured to crooked crossbeam that a side clamps, by the metal release armature of ferromagnetic shape memory, this release armature is arranged in the inside of release coil
Fig. 6 is that the 3rd execution mode by Fig. 5 is in the schematic diagram in the release condition,
Fig. 7 is the schematic diagram during the 4th execution mode by switching device of the present invention remains static, and this switching device has by the metal helical form of ferromagnetic shape memory and discharges armature, and this release armature is arranged in the inside of release coil,
Fig. 8 is that the 4th execution mode by Fig. 7 is in the schematic diagram in the release condition,
Fig. 9 is the schematic diagram during the 5th execution mode by switching device of the present invention remains static, this switching device have clavate, by metal release armature of ferromagnetic shape memory and the thermal release made by the thermo bimetal, wherein said release armature is arranged in the inside of release coil
Figure 10 is that the 5th execution mode by Fig. 9 is in the schematic diagram in the release condition,
Figure 11 and 12 is respectively that the 6th execution mode is in the schematic diagram in the not release condition and release condition,
Figure 13 is the schematic diagram of fault current protection switch.
Embodiment
Fig. 1 has schematically illustrated the not release condition of a switching device 1, and this switching device 1 has shell 2, electromagnetism release 20 and switching mechanism 36.Figure 2 illustrates the release condition by the switching device of Fig. 1, assembly wherein identical or similar effect or part are represented with identical Reference numeral.
Between input 14 and output 16, current path extends through movable twisted wire 18, be bearing in contact lever 10 in the contact lever bearing 12, comprise the movable contact 6 that is positioned on the described contact lever 10 and the contact site 4 and the release coil 22 of fixed contact therefor 8.In the position of the switch shown in Figure 1, described contact site 4 closures.Here also have a yoke 40 to be connected with fixed contact therefor 8 with described release coil 22 by the middleware 42 of ear shape.
Be not illustrated in the hot release that also additionally comprises in some switching device at this, this hot release acts on described switching mechanism when overcurrent occurring, makes this switching mechanism then continue to disconnect described contact site.
Described electromagnetism release 20 comprises described release coil 22 and discharges armature 24 that this release armature 24 is configured to crossbeam shape here, and is arranged in the inside of described release coil 22, overlaps thereby make described coil longitudinal axis and discharge armature-longitudinal axis.
On fixing first end 24 ', described release armature 24 is fixed in the release armature-bearing 28 that is connected with described shell 2.At its second end 24 freely " on, described release armature 24 is with among push rod 26 is in effective the connection.This effective connection is shown form fit here and connects, but scheme as an alternative can realize that also power transmission connection or material connect.
Described release armature 24 is at its free end 24 " on have notch 25, be bearing in release lever-bearing 32 release lever 30 such as be in its freely the Y-piece on the first end 30 ' be engaged in this notch 25.The second end freely 30 of described release lever 30 " then be engaged in the space 35 in the slide bar 34, this slide bar 34 by position 38 with among described switching mechanism 36 is in effective the connection.
Described release armature 24 is made by a kind of ferromagnetic shape memory alloy based on nickel, manganese and gallium.Such ferromagnetic shape memory alloy is open on principle, and can buy and obtain, and they are such as by the AdaptaMat Ltd. of Finland company produce and market.The typical composition that is used in the ferromagnetic shape memory alloy in the switching device by the present invention is by structural formula Ni
65-x-yMn
20+xGa
15+yDetermine that wherein x is between 3 atomic percentages and 15 atomic percentages, and y is between 3 atomic percentages and 12 atomic percentages.Here employed ferromagnetic shape memory alloy has such characteristic, promptly its martensitic phase just make described material be under the thermal transition temperature mutually in, carry out transition under the externally small the action of a magnetic field between two kinds of crystal structure schemes of twin crystal structure, this transition is relevant with change of shape on macroscopic view.In the embodiment of selected here release armature, described change of shape is along the linear extension of the direction of crossbeam longitudinal axis.
Thermal transition temperature in the employed here ferromagnetic shape memory alloy is in the room temperature range, and can the variation in bandwidth range regulate by described atomic percentage share x and y.Described operating temperature range can be regulated by being chosen in the bandwidth range of material composition thus, and wherein said electromagnetism release is just worked in this operating temperature range.
If the very high short circuit current described switching device 2 of flowing through under short-circuit conditions, so described release armature 24 is owing to above-mentioned effect expands, therefore and described push rod 26 is pushed movable contact 6 open from fixed contact therefor 8, thereby as in the described contact site 4 of the disconnection shown in Fig. 2 and cut off this switching device.In this process, described ferromagnetic shape memory material very rapidly expands and does not almost delay.Delay time typically was in the order of magnitude of a millisecond as the time difference that occurs at short circuit current and discharge between the armature 24 maximum longitudinal dilatations.
Dispose procedure obtains the support of described release lever 30 here, contour described release lever-bearing 32 and is clockwise rotated when this release lever 30 expanded at described release armature 24, and along its longitudinal extension direction-represented-is passed by direction arrow S, make this slide bar 34 by the described switching mechanism 36 of described position 38 actuatings here described slide bar 34 this moment.
After discharging described switching device, described current path interrupts and the magnetic field of described release coil 22 also disappears.Therefore described release armature 24 is retracted to its original size again, and described thus release lever 30 is got back to again and resembled in the home position shown in Fig. 1.Described contact site 4 continues to remain in the open position by described switching mechanism 36 by unshowned position here now.
Figure 3 illustrates the state that does not discharge by the another kind of execution mode of switching device 1a of the present invention, and the release condition of this switching device 1a shown in Figure 4.Assembly or part usefulness identical or a same function are represented with Reference numeral identical in Fig. 1 and 2, but have been increased alphabetical a.Being, described in the former, be arranged in the outside of described release coil 22a by the release armature 24a that makes based on the ferromagnetic shape memory alloy of NiMnGa by the switching device 1a of Fig. 3 and 4 with by the main distinction between the switching device 1 of Fig. 1 and 2.In addition, for simplicity's sake, described release lever 30a, slide bar 34a and switching mechanism 36a are not shown in Fig. 3 and 4.The change of shape of described release armature 24a is caused by the magnetic field in the perimeter that is in release coil 22a in the execution mode shown in Fig. 3 and 4 under short-circuit conditions.The respective design of described release coil 22a and magnetic circuit can be by those of ordinary skill by means of its common professional knowledge and carry out under the support that obtains system test.
Figure 5 illustrates not release condition by the another kind of execution mode of switching device 1b of the present invention, and the release condition of this switching device 1b shown in Figure 6.Assembly or part usefulness identical or a same function are represented with Reference numeral identical on switching device shown in Fig. 1 and 21, but have been increased alphabetical b.Be by the switching device 1b of Fig. 5 and 6 with by the main distinction between the switching device 1 of Fig. 1 and 2, discharge armature 24b and be configured to crooked crossbeam described in the former, this bending crossbeam is clamped on described release armature-supporting point 28b in a side securely with fixing first end 24b '.This release armature 24b is arranged in the inner room of described release coil 22b.The change of shape of being brought out by the magnetic field of described release coil 22b under short-circuit conditions is embodied in described release armature 24b here at its second end 24b freely " on bending, referring to Fig. 6.The 24b of the second end freely of described release armature 24b " be engaged among the space 35b among the first support arm 33b of described L shaped slide bar 34b, thus this slide bar 35b when described release armature 24b is crooked along the longitudinal extension direction of the described first support arm 33b-here by direction arrow S represent-direction move.Described slide bar 34b goes up with among push rod 26b is in effective the connection at its second support arm 33b ', and this push rod 26b pushes movable contact 6b open when described slide bar 34b moves from fixed contact therefor 8b, and disconnects described contact site 4b thus.For simplicity's sake, described switching mechanism 36 is not shown in Fig. 5 and 6 illustrated embodiment.
Figure 7 illustrates not release condition by the another kind of execution mode of switching device 1c of the present invention, and the release condition of this switching device 1c shown in Figure 8.Assembly or part usefulness identical or a same function are represented with Reference numeral identical on switching device shown in Fig. 1 and 21, but have been increased alphabetical c.Be that by the switching device 1c of Fig. 7 and 8 with by the main distinction between the switching device 1 of Fig. 1 and 2 the former described release armature 24c is configured to helical form, and be parallel in the inside of described release coil 24c among the guide pin bushing 23c of coil axis orientation and guide.Magnetic field by described release coil 22c induces the change of shape that described helical form discharges armature 24c under short-circuit conditions, this change of shape is embodied in the elongation of spiral 24c on the direction of spiral longitudinal axis that described formation discharges armature here, expresses this direction by direction arrow L here.Discharge the 24c of end freely of armature 24c in described helical form " on, this release armature 24c is with among described push rod 26c is in effective the connection, and this push rod 26c disconnects described contact site 4c under release conditions, referring to Fig. 8.
Figure 9 illustrates not release condition by the another kind of execution mode of switching device 1d of the present invention, and the release condition of this switching device 1d shown in Figure 10.Assembly or part usefulness identical or a same function are represented with Reference numeral identical on switching device shown in Fig. 1 and 21, but have been increased alphabetical d.
The structure of electromagnetism release 20d in Fig. 9 and 10 illustrated embodiment is identical with the structure of the electromagnetism release 20 in Fig. 1 and 2 illustrated embodiment.In the execution mode of pressing Fig. 9 and 10, described input and output and described switching mechanism are not shown for simplicity's sake.Also comprising hot type overcurrent release by the switching device 1d in Fig. 9 and 10 illustrated embodiment except described electromagnetism release 20d.This overcurrent release mainly is made of thermo bimetal's bar 44d, this thermo bimetal's bar 44d is with its fixing first end 44d " be fixed on bimetallic-support 48d, and its movable the second end 44d ' is engaged among another space 35d ' of described slide bar 34d.Described current path extends to (unshowned) output from (unshowned) input through the first twisted wire 18d, the contact lever 18d of activity, contact 6d, contact site 4d, release coil 22d, bi-metal stent 48d, thermo bimetal's bar 44d, the second movable twisted wire 18d ' that 8d constitutes that is fixed by reaching of activity here always.
Occurring under the situation of overcurrent, described thermo bimetal's bar 44d is along by the represented direction bending of direction arrow B, make described slide bar 34d along its longitudinal axis-by direction arrow S represented-direction move, and by (unshowned here) position and (unshowned equally here) switching mechanism acting in conjunction, this switching mechanism then continues to disconnect described contact site 4d.Occurring under the situation of short circuit current, as discharging of below Fig. 1 and 2, describing already by means of described electromagnetism release 20d.
After disappearing owing to the contact under release conditions disconnects, the reverse distortion of described release armature 24d is supported, in execution mode, be provided with back-moving spring 46d by Fig. 9 and 10 in the magnetic field of described release coil 22s.This back-moving spring 46d here is a helical spring, and comprises described push rod 26d.But it also can be leaf spring or construct with other suitable manner method.Described back-moving spring in release condition not (Fig. 9) is in relaxed state.It with an end portion supports on the spring base 50d that is connected with shell, and with the movable end 24d of its another end portion supports at described release armature 24d " on.Under release conditions (Figure 10), this back-moving spring compresses because of the release armature 24d that expands.
At shown in Fig. 1 to 10 and illustrated embodiment is the schematic diagram that is using possible exemplary non-termination by switching device of the present invention under the situation of electromagnetism release, and described electromagnetism release has the release armature of being made by ferromagnetic shape memory alloy.Also can be from all other is disclosed in the prior art, the switching device scheme with electromagnetism release, make by switching device of the present invention by this mode of ferromagnetic shape memory alloy that is used to form described release armature by the present invention.
Be mainly some specific materials at this execution mode by Fig. 1 to 10 is explained, wherein only relate to described magnetic shape memory effect.If use those not only to have magnetic but also material that have hot shape memory effect, that also can use identical with consistent design.Discharge but also be used for hot release owing to can fully phase out described thermo bimetal 44d and only described release armature 24d not only is used for electromagnetism, therefore especially produce a kind of particularly preferred execution mode, as Fig. 9 and 10 related.
Be at execution mode shown in Fig. 9 and the difference between the execution mode shown in Fig. 1, in execution mode shown in Fig. 9, directly described release armature 24d is heated by electric current, and be not as the back a kind of execution mode in indirectly by heating from the thermal radiation of release coil 22d.At this to being described below by the current path in the execution mode of Fig. 9: electric current from input 14d through twisted wire 18d, the contact lever 10d of activity, contact site 4d by described release coil 22d, and further according to the mode of this release coil 22d series connection through another activity this end of described release coil 22d and the previous section of described release armature 24d are conducted electricity the twisted wire 18d ' that is connected, further flow to described output 16d by described release armature 24d and from the end 24d ' that fixes of this release armature 24d.Occurring under the situation of overcurrent, therefore described release armature 24d is directly heated by electric heating.Can aspect hot, design more accurately thus hot and magnetic release 20d.
Because the contact disconnects the situation that can occur short circuit current after the magnetic field of described release coil 22d disappears, because the contact disconnects after described release armature 24d is cooled to be lower than the temperature of described thermal transition temperature overcurrent situations appears perhaps, for after discharging in both cases the reverse distortion of described release armature 24d is supported, in execution mode, be provided with back-moving spring 46d by Fig. 9 and 10.This back-moving spring 46d here is a helical spring, and comprises described push rod 26d.But it also can be leaf spring or construct with other suitable manner method.Described back-moving spring in release condition not (Fig. 9) is in relaxed state.It with an end portion supports on the spring base 50d that is connected with shell, and with the end 24d of its another end portion supports in the activity of described release armature 24d " on.Under release conditions (Figure 10), this back-moving spring compresses because of the release armature 24d that expands.
At shown in Fig. 1 to 10 and illustrated embodiment is the schematic diagram that is using possible exemplary non-termination by switching device of the present invention under the situation of hot and release electromagnetism, and described hotly have the release armature of being made by ferromagnetic shape memory alloy with release electromagnetism.Also can be from all other is disclosed in the prior art, the switching device scheme of release with hot and electromagnetism, make by switching device of the present invention by the ferromagnetic shape memory alloy that is used to form described release armature by the present invention.
Be at execution mode shown in Figure 11 and the difference between the execution mode shown in Fig. 1, in execution mode shown in Figure 11, directly described release armature 24d is heated, and be not as in a kind of execution mode in back, heating by the thermal radiation of release coil 22d indirectly by electric current.At this to being described below by the current path in the execution mode of Fig. 9: electric current from input 14d through twisted wire 18d, the contact lever 10d of activity, contact site 4d by described release coil 22d, and further according to the mode of this release coil 22d series connection through another activity this end of described release coil 22d and the previous section of described release armature 24d are conducted electricity the twisted wire 18d ' that is connected, further flow to described output 16d by described release armature 24d and from the end 24d ' that fixes of this release armature 24d.Occurring under the situation of overcurrent, therefore described release armature 24d is directly heated by electric heating.Can aspect hot, design more accurately thus hot and magnetic release 20d.
Because the contact disconnects the situation that can occur short circuit current after the magnetic field of described release coil 22d disappears, because the contact disconnects after described release armature 24d is cooled to be lower than the temperature of described thermal transition temperature overcurrent situations appears perhaps, for after discharging in both cases the reverse distortion of described release armature 24d is supported, in execution mode, be provided with back-moving spring 46d by Fig. 9 and 10.This back-moving spring 46d here is a helical spring, and comprises described push rod 26d.But it also can be leaf spring or construct with other suitable manner method.Described back-moving spring in release condition not (Fig. 9) is in relaxed state.It with an end portion supports on the spring base 50d that is connected with shell, and with the end 24d of its another end portion supports in the activity of described release armature 24d " on.Under release conditions (Figure 12), this back-moving spring compresses because of the release armature 24d that expands.
At shown in Fig. 1 to 12 and illustrated embodiment is the schematic diagram that is using possible exemplary non-termination by switching device of the present invention under the situation of hot and release electromagnetism, and described hotly have the release armature of being made by ferromagnetic shape memory alloy with release electromagnetism.Also can be from all other is disclosed in the prior art, the switching device scheme of release with hot and electromagnetism, make by switching device of the present invention by the ferromagnetic shape memory alloy that is used to form described release armature by the present invention.
Also will be at this tout court with reference to Fig. 1 and 2.A kind of switching device is shown there, and this switching device is that short circuit current designs.As in this case as can be seen, the described motion that also can be called the armature 24 of push rod is delivered to contact lever 10.In addition, the motion of push rod 24 also passes to described latching device 36 by leverage 30 and slide bar 34.Iff will the switch by Fig. 1 being changed for open circuit when breaking down electric current, so described coil 22 is connected with so-called primary coil in the failure current protection switch and saves described push rod 26, from rather than source current but secondary current is flowed through described coil 22; The motion of then described push rod 24 is such as the described latching device that leads by parts 30 and 34.Certainly also there is this possibility, promptly arranges described push rod 24, make it directly act on described latching device 36.
The schematic diagram of this arrangement can obtain from Figure 13. Primary wires 61 and 62 is passed from instrument transformer iron core 60, and described primary wires 61 and 62 has contact site 63 and 64.Arranged the secondary coil 65 that is connected with coil 66 round described instrument transformer iron core 60, push rod 67 passes this coil 66, and this push rod 67 also can be made by the material with magnetic and hot shape memory effect by the material of the shape memory effect with magnetic but in case of necessity.This push rod 67 acts on latching device 68 according to direction of arrow P1, and described latching device acts on described contact site 63,64 according to direction of arrow P2 after opening circuit.Compare with the arrangement by Fig. 1, described push rod 67 has Reference numeral 24 in Fig. 1; Described latching device 68 has Reference numeral 36 in Fig. 1; described coil 66 has Reference numeral 22 in the arrangement by Fig. 1; and as can be seen; lack push rod 26, because it is not general to directly act on described contact site 63,64 this situations on such failure current protection switch.
Reference numerals list:
| 1、1a、1b、1c、1d | Switching device |
| 2、2a、2b、2c、2d | Shell |
| 4、4a、4b、4c、4d | The contact site |
| 6、6a、6b、6c、6d | Movable contact |
| 8、8a、8b、8c、8d | Fixing contact |
| 10、10a、10b、10c、10d | Contact lever |
| 12、12a、12b、12c、12d | Contact-bearing |
| 14、14a、14b、14c | Input |
| 16、16a、16b、16c | Output |
| 18、18a、18b、18c、18d、18d’ | Movable twisted wire |
| 20、20a、20b、20c、20d | Electromagnetic releaser |
| 22、22a、22b、22c、22d | Release coil |
| 23c | Guide pin bushing |
| 24、24a、24b、24c、24d | Discharge armature |
| 24’、24b’ | Discharge the anchor portion of armature |
| 24”、24b”、24c”、24d” | Discharge the movable end of armature |
| 25 | Notch |
| 26、26a、26b、26c、26d | Push rod |
| 28、28a、28b、28c、28d | Discharge armature-bearing |
| 30 | Release lever |
| 30’ | The freely first end of release lever |
| 30” | The freely the second end of release lever |
| 32、32d | Release lever-bearing |
| 33b | First support arm of slide bar 34b |
| 33b’ | Second support arm of slide bar 34b |
| 34、34b、34d | Slide bar |
| 35、35b、35d、35d’ | Space in the slide bar |
| 36 | Switching mechanism |
| 38 | Position |
| 40、40a、40b、40c、40d | Yoke |
| 42、42a、42b、42c、42d | Middleware |
| 44d | Thermo bimetal's bar |
| 44d’ | The end of the activity of thermo bimetal's bar |
| 44d” | The fixing end of thermo bimetal's bar |
| 46d | Back-moving spring |
| 48d | Bi-metal stent |
| 50d | Spring base |
| S、L、B | Direction arrow |
Claims (25)
1. switching device (1,1a, 1b, 1c, 1d), have shell (2,2a, 2b, 2c, 2d) and at least one comprise fixed and movable contact (8,8a, 8b, 8c, 8d; 6,6a, 6b, 6c, contact site (4 6d), 4a, 4b, 4c, 4d)) and have a release coil (22,22a, 22b, 22c, 22d) with release armature (24,24a, 24b, 24c, electromagnetism release (20 24d), 20a, 20b, 20c, 20d), it is characterized in that, described release armature (24,24a, 24b, 24c, 24d) make by the material that has magnetic shape memory effect at least, wherein occur under the situation of short circuit current and/or the current conditions that breaking down under at described release coil (22,22a, 22b, 22c, under the influence in magnetic field 22d), described release armature (24,24a, 24b, 24c, 24d) deform, and make described contact site (4 thus, 4a, 4b, 4c, 4d) disconnect.
2. by the described switching device of claim 1, it is characterized in that, described material also has hot shape memory effect except magnetic shape memory effect, thereby described release armature is not only deforming under the influence in magnetic field but also under the Temperature Influence that is raising.
3. by claim 1 or 2 described switching devices, it is characterized in that described release armature (24,24a, 24b, 24c, 24d) is made by a kind of ferromagnetic shape memory alloy of being made by nickel, manganese and gallium.
4. by each described switching device in the claim 1 to 3, it is characterized in that, described release armature (24,24a, 24d) is elongate members, and occur under the situation of short circuit current and/or under the situation of the electric current that breaks down in the direction elongation that influences its longitudinal axis of lower edge in the magnetic field of described release coil (22,22a, 22d).
5. by each described switching device in the claim 1 to 3, it is characterized in that, described release armature (24b) is configured to the crossbeam shape, and is occurring under the situation of short circuit current and/or bending under the influence in the magnetic field of described release coil (22b) under the situation of the electric current that breaks down.
6. by each described switching device in the claim 1 to 3, it is characterized in that, described release armature (24c) is configured to helical form, and occur under the situation of short circuit current and/or under the situation of the electric current that breaks down in the direction elongation that influences lower edge spiral longitudinal axis in the magnetic field of described release coil (22c).
7. by each described switching device in the claim 1 to 6, it is characterized in that described release armature (24,40b, 24c, 24d) is surrounded by described release coil (22,22b, 22c, 22d).
8. by each described switching device in the claim 1 to 6, it is characterized in that described release armature (24a) is placed in the place of the outside of described release coil (22a) near this release coil.
9. by each described switching device in the claim 1 to 3, it is characterized in that described release armature (24,24a, 24d) is elongated parts and the direction elongation that influences its longitudinal axis of lower edge that not only raises under the influence that occurs under the situation of short circuit current in the magnetic field of described release coil (22,22a, 22d) but also in the temperature that causes because of overcurrent.
10. by each described switching device in the claim 1 to 9, it is characterized in that, described release armature (24b) is configured to the crossbeam shape, and is not only bending under the influence that occurs under the situation of short circuit current in the magnetic field of described release coil (22b) but also under the influence that raises of the temperature that is causing because of overcurrent.
11. by each described switching device in the aforementioned claim, it is characterized in that, described release armature (24c) is configured to helical form, and not only under the influence that occurs under the situation of short circuit current in the magnetic field of described release coil (22c) but also under the influence that raises of the temperature that is causing because of overcurrent along the direction elongation of spiral longitudinal axis.
12., it is characterized in that described release armature (24,24b, 24c, 24d) is surrounded by described release coil (22,22b, 22c, 22d) by each described switching device in the aforementioned claim.
13., it is characterized in that described release armature (24a) is placed in the outside place near this release coil of described release coil (22a) by each described switching device in the aforementioned claim.
14. by each described switching device in the aforementioned claim, it is characterized in that, occurring under the situation of overcurrent, causing that by means of the indirect of being undertaken the temperature of described release armature (24,24a, 24b, 24c) raises by the release coil of described guiding overcurrent (22,22a, 22b, 22c).
15. by each described switching device in the aforementioned claim, it is characterized in that, cause in the direct heating of the temperature rising that described release armature (24d) under the situation of overcurrent occurs by the overcurrent of the described release armature (24d) of flowing through.
16. by each described switching device in the claim 1 to 9, it is characterized in that described release armature (24,24a, 24b, 24d) is fixed in the bearing that is connected with described shell (2,2a, 2b, 2d) (28,28a, 28b, 28d) on first end.
17. by each described switching device in the claim 1 to 9, it is characterized in that, described release armature (24,24a, 24b, 24c, 24d) on its second end with among push rod (26,26a, 26b, 26c, 26d) is in effective the connection.
Be used for switching device (1 18. have the material of magnetic shape memory effect, 1a, 1b, 1c, electromagnetism release (20 1d), 20a, 20b, 20c, application 20d), described release has release coil (22,22a, 22b, 22c, 22d) with release armature (24,24a, 24b, 24c, 24d), it is characterized in that, described release (20,20a, 20b, 20c, release armature (24 20d), 24a, 24b, 24c, 24d) make by described material with magnetic shape memory effect, wherein under the situation that short circuit current and/or fault current occur, described release armature (22,22a, 22b, 22c, 22d) at described release coil (22,22a, 22b, 22c, deform under the influence in magnetic field 22d), and make the contact site thus (4,4a, 4b, 4c, 4d) disconnect.
19. by the described application of claim 10, it is characterized in that, use the ferromagnetic shape memory alloy of making by nickel, manganese and gallium with material of magnetic shape memory effect.
20. the material with magnetic shape memory effect is at switching device (1,1a, 1b, 1c, be used for the application that short circuit current discharges 1d), this switching device comprises contact site (4,4a, 4b, 4c, 4d) with electromagnetism release (20,20a, 20b, 20c, 20d), it is characterized in that, described electromagnetism release (20,20a, 20b, 20c, release armature (24 20d), 24a, 24b, 24c, 24d) make by described material with magnetic shape memory effect, described electromagnetism release has release coil (22,22a, 22b, 22c, 22d) with release armature (24,24a, 24b, 24c, 24d), wherein under the situation that short circuit current and/or fault current occur, described release armature (24,24a, 24b, 24c, 24d) at described release coil (22,22a, 22b, 22c, deform under the influence in magnetic field 22d), and make the contact site thus (4,4a, 4b, 4c, 4d) disconnect.
21. be used for the application that short circuit current discharges by the described material with magnetic shape memory effect of claim 20, this material is made by a kind of ferromagnetic shape memory alloy of being made by nickel, manganese and gallium.
Be used for switching device (1 22. have composite type material hot and magnetic shape memory effect, 1a, 1b, 1c, hot and magnetic release (20 1d), 20a, 20b, 20c, application 20d), this hot and magnetic release comprises release coil (22,22a, 22b, 22c, 22d) with release armature (24,24a, 24b, 24c, 24d), it is characterized in that, described release (20,20a, 20b, 20c, release armature (24 20d), 24a, 24b, 24c, 24d) have composite type material hot and magnetic shape memory effect and make by described, wherein not only occurring under the short circuit current situation at described release coil (22,22a, 22b, 22c, under the influence in magnetic field 22d), and under the influence that the temperature that is caused by overcurrent raises, described release armature (24,24a, 24b, 24c, 24d) deform, and make described contact site (4 thus, 4a, 4b, 4c, 4d) disconnect.
23. by the described application with material of the hot and magnetic shape memory effect of composite type of claim 22, this material is made by a kind of ferromagnetic shape memory alloy of being made by nickel, manganese and gallium.
24. the material with the hot and magnetic shape memory effect of composite type is at switching device (1,1a, 1b, 1c, be used for the application that short circuit current discharges and overcurrent discharges 1d), this switching device comprises contact site (4,4a, 4b, 4c, 4d) with hot and magnetic release (20,20a, 20b, 20c, 20d), it is characterized in that, described release (20,20a, 20b, 20c, release armature (24 20d), 24a, 24b, 24c, 24d) have composite type material hot and magnetic shape memory effect and make by described, described release has release coil (22,22a, 22b, 22c, 22d) with release armature (24,24a, 24b, 24c, 24d), wherein not only occurring under the situation of short circuit current at described release coil (22,22a, 22b, 22c, under the influence in magnetic field 22d), and under the influence that the temperature that caused by overcurrent raises described release armature (24,24a, 24b, 24c, 24d) deform, and make described contact site (4 thus, 4a, 4b, 4c, 4d) disconnect.
25. have composite type material hot and magnetic shape memory effect and be used for the application that short circuit current discharges and overcurrent discharges by claim 14 is described, this material is made by a kind of ferromagnetic shape memory alloy of being made by nickel, manganese and gallium.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004056279.2 | 2004-11-22 | ||
| DE102004056280A DE102004056280A1 (en) | 2004-11-22 | 2004-11-22 | Protective switch with magnetic release for e.g. motor or circuit protection, is made from alloy with magnetic shape memory |
| DE102004056280.6 | 2004-11-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101061559A true CN101061559A (en) | 2007-10-24 |
Family
ID=36313819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800399010A Pending CN101061559A (en) | 2004-11-22 | 2005-11-15 | Switching equipment comprising an electromagnetic trip device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101061559A (en) |
| DE (1) | DE102004056280A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102903579A (en) * | 2011-07-28 | 2013-01-30 | 桂林机床电器有限公司 | Circuit breaker or switch |
| CN106030752A (en) * | 2013-12-20 | 2016-10-12 | 伊顿工业（奥地利）有限公司 | Switching device |
| CN107808804A (en) * | 2017-12-05 | 2018-03-16 | 中国石油大学(华东) | magnetic shape memory alloy breaker |
| CN109920665A (en) * | 2019-04-17 | 2019-06-21 | 曹宁 | A kind of electromagnetism axle-centre lock electric power switch unit |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010014280B4 (en) | 2010-04-08 | 2021-11-25 | Eto Magnetic Gmbh | Overcurrent switching device |
| DE102017106084A1 (en) * | 2017-03-21 | 2018-09-27 | Eto Magnetic Gmbh | Overcurrent protection device |
| CN112706270A (en) * | 2020-12-31 | 2021-04-27 | 贵州中航聚电科技有限公司 | Demoulding machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT31590B (en) | 1907-03-19 | 1908-01-25 | Arthur Adam | Scissors. |
| FR2431761A1 (en) * | 1978-07-21 | 1980-02-15 | Delta Materials Research Ltd | IMPROVED ELECTRIC CIRCUIT BREAKER |
| DE3013016A1 (en) * | 1980-04-03 | 1981-10-08 | Brown, Boveri & Cie Ag, 6800 Mannheim | RELEASE SYSTEM OF A SELF-SWITCH TO INTERRUPT A CIRCUIT |
| FR2557353B1 (en) * | 1983-12-26 | 1986-04-11 | Merlin Gerin | MAGNETOTHERMAL TRIGGER IN SHAPE MEMORY MATERIAL, ASSOCIATED WITH A CIRCUIT BREAKER MECHANISM |
| DE69729219T2 (en) * | 1996-08-19 | 2005-05-25 | Massachusetts Institute Of Technology, Cambridge | HIGH MECHANICAL VOLTAGE MATERIALS FOR MAGNETIC FIELD-CONTROLLED ACTUATOR |
| FI982407A0 (en) * | 1998-03-03 | 1998-11-06 | Adaptamat Tech Oy | Controls and devices |
| WO2000052723A1 (en) * | 1999-03-03 | 2000-09-08 | Abb Patent Gmbh | Magnetic trigger, especially for a circuit breaker, and circuit breaker having such a magnetic trigger |
| DE10126852B4 (en) * | 2001-06-01 | 2005-02-03 | Siemens Ag | Switching device with an electromagnetic tripping device |
-
2004
- 2004-11-22 DE DE102004056280A patent/DE102004056280A1/en not_active Withdrawn
-
2005
- 2005-11-15 CN CNA2005800399010A patent/CN101061559A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102903579A (en) * | 2011-07-28 | 2013-01-30 | 桂林机床电器有限公司 | Circuit breaker or switch |
| CN106030752A (en) * | 2013-12-20 | 2016-10-12 | 伊顿工业（奥地利）有限公司 | Switching device |
| US9748061B2 (en) | 2013-12-20 | 2017-08-29 | Eaton Industries (Austria) Gmbh | Switching device |
| CN107808804A (en) * | 2017-12-05 | 2018-03-16 | 中国石油大学(华东) | magnetic shape memory alloy breaker |
| CN109920665A (en) * | 2019-04-17 | 2019-06-21 | 曹宁 | A kind of electromagnetism axle-centre lock electric power switch unit |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102004056280A1 (en) | 2006-05-24 |
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