CN1095591C - Method for winding non-inductive winding and superconductor switch wound by it - Google Patents
Method for winding non-inductive winding and superconductor switch wound by it Download PDFInfo
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- CN1095591C CN1095591C CN98117777A CN98117777A CN1095591C CN 1095591 C CN1095591 C CN 1095591C CN 98117777 A CN98117777 A CN 98117777A CN 98117777 A CN98117777 A CN 98117777A CN 1095591 C CN1095591 C CN 1095591C
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Abstract
The present invention provides a new method for winding non-inductive coils, and also provides a superconducting switch manufactured by the method. The interlayer steering reverse rotation single winding method of the present invention uses a single wire to wind a non-inductive coil, when the winding of a key layer is finished, the step of steering reverse rotation is carried out for winding continuously. The operation of steering reverse rotation is carried out at least once, and the non-inductive coil is designed with even layers in general. A plurality of steering columns are arranged on an end plate of a coil main skeleton to realize the operation of steering reverse rotation, and a front side groove and a back side groove are arranged on both sides of each steering column. The superconducting switch manufactured by the method of the present invention has the advantages of uniform internal stress and reliable and stable quality. The method and the technology of the present invention is simple and practical, and is especially suitable for winding non-inductive coils by hard and thick conductive wires.
Description
Technical field
The invention belongs to essential electronic element, specifically, relate to the winding method of noninductive coil, and the noninductive coil that uses this method coiling, comprise superconducting switch, electric elements such as resistive superconducting flow restricter.
Background technology
In electrical engineering, common coil all is to have certain induction coefficient.And to need a kind of induction coefficient sometimes be zero or approach zero coil, and purpose is only to utilize its impedance effect, eliminates its induction reactance influence to circuit and environment, and this coil is referred to as noninductive coil.
The winding method of coil commonly used is single winding.Single winding normally is fixed on the coil rack through pulley through clamping device by coil holder by the end around lead again, and coil winding machine drives the skeleton rotation makes lead around thereon, when coiling finishes, draws the other end, promptly finishes coiling.Existing noninductive coil winding method is a double wound, it be will be used for coiling length of wire by mid point and together, earlier this mid point is fixed on certain position of skeleton, two strands coiling simultaneously then, when coiling finished, the input and the output of coil were drawn simultaneously, are noninductive coil.The disclosed technology of Chinese patent application CN1160275A promptly is that double wound is manufactured the concrete application of noninductive coil in the telecommunication field.This patent proposes will guarantee the length of the internal diameter of coil greater than coil in coiling.
The double wound technology is when coiling, the tension force of two strands is difficult for being adjusted into identical value, even be adjusted into for the moment identical value, because two strands exist fine difference by coil holder to the delivered length of skeleton, cause the tension force of two strands can not remain identical value, therefore reduced the stability of manufactured goods.When using heavy wire or cable coiling noninductive coil, this contradiction is just more outstanding.
Noninductive coil is important and typical application is a superconducting switch.Superconducting switch is to use and prerequisitely in the circuit of superconducting magnet makes the electric equipment that circuit is closed and cut-off.The main body of superconducting switch is the noninductive coil that forms with the superconducting wire coiling.During work, superconducting switch can carry out the conversion between superconducting state and the normal state under low temperature environment.At superconducting state, the resistance of coil is zero, and circuit is considered as closure; In normal state, the resistance of coil is a certain value, and circuit is considered as cut-offfing.This conversion of superconducting switch need be controlled, and the mode of control has multiple, and wherein the most frequently used is thermally controlled.The conversion and control of thermally controlled superconducting switch is to utilize the heater strip that contacts with superconducting wire in the coil to realize.
The key technology of superconducting switch is the structural design and the technique for coiling of the noninductive coil (comprising skeleton) of function admirable, and the winding method of noninductive coil greatly influences and determined the structure of superconducting switch.Existing superconducting switch owing to the difference of two strand tension force and length, has reduced the stability of superconducting switch with aforesaid double wound coiling.When using heavy wire or cable coiling superconducting switch, this defective is just even more serious.
Summary of the invention
The objective of the invention is to propose a kind of winding method of new noninductive coil, specifically a kind of based on the single line coiling and be equipped with at the reverse winding method of switch operation of key position, abbreviate the single winding of interlayer commutation counter-rotating as, and propose the design of related with it face of cylinder skeleton.Another object of the present invention is the structure that proposes the superconduct thermally controlled superconducting switch of employing the inventive method manufacturing.It is the most typical application example of using the inventive method coiling noninductive coil.
The winding method of noninductive coil of the present invention is called the single winding of interlayer commutation counter-rotating, its essence is adopt the single line coiling and in winding process will by around lead commutation counter-rotating continuous around, we are the commutation inversion layer at claim the to commutate position at reverse turn operation place.This commutation reverse turn operation at least once carries out when the coiling of commutation inversion layer finishes.The definite of commutation inversion layer should make the forward coiling of whole winding partly equal with the volume of reverse coiling part or equal substantially.The noninductive coil of institute's coiling is an even level, be at least two-layer, when total number of plies can be eliminated by 4, forward coiling part and oppositely the coiling part can arrange in pairs or groups fully, promptly its forward coiling part and oppositely the volume of coiling part equate; When other situation can not be arranged in pairs or groups fully, should reduce the number of turn at outermost layer, the volume of forward coiling part and reverse coiling part is equated substantially.
In order to realize the reverse turn operation that commutates, on the end plate of coil main framing, be provided with several commutation posts, go into wire casing and go out wire casing, there are front groove and back groove in commutation post both sides.
The single winding of interlayer commutation counter-rotating of the present invention is closely-related with the structural design of the noninductive coil that adopts this method coiling, and the key technology of the technique for coiling of coil and the structural design of coil rack has:
(1) determining of determining of the coil number of plies, and commutation inversion layer.Commutation position is relevant with the number of plies of coil, and is relevant with the about layer collocation of forward coiling part and reverse coiling part;
(2) the commutation post is set on the coil rack end plate, the number of commutation post is relevant with the position of commutation number of times and commutation inversion layer with the position, and there are front groove and back groove in commutation post both sides;
(3) on end plate, have into wire casing and go out wire casing, go into wire casing and go out the position and the incline direction of wire casing, relevant with the coil number of plies and commutation number of times.
Noninductive coil with the single winding coiling of interlayer commutation counter-rotating of the present invention is designed to even level, and is at least two layers, and the design of commutation inversion layer is most important.Its design principle is: (1) makes the forward coiling part of whole winding and oppositely the coiling partial volume is equal as far as possible, and about layer cooperates wants suitable; When (2) having only the total number of plies of coil to be eliminated by 4, forward coiling part and reverse coiling part could be arranged in pairs or groups fully.What is called is arranged in pairs or groups fully, when being meant coil with complete number of plies coiling, can make its forward coiling part and oppositely the coiling partial volume is equal fully by the outer field suitable cooperation in lining.Other situation when forward coiling part can not be arranged in pairs or groups fully with reverse coiling part, should reduce the number of turn at outermost layer, so that two-part volume equates substantially; (3) reduce the number of commutation post as far as possible.
The position of commutation post is determined according to the following rules: if finish the back commutation at the even numbers layer, the commutation post is located on the end plate (for example bottom plate) at wire casing place; If finish the back commutation at the odd number layer, the post that then commutates is located on another end plate (for example upper head plate).
Going into wire casing on the end plate and going out wire casing is design like this: because interlayer counter-rotating noninductive coil is designed to even level, all be located on the same end plate so go into wire casing and go out wire casing, when commutation number of times when being odd number, the incline direction that goes out wire casing is with to go into wire casing consistent, and go out wire casing and go into wire casing can be shared.When commutation number of times when being even numbers, the incline direction that then goes out wire casing is with to go into wire casing opposite.Sometimes, go into wire casing and go out wire casing and can replace with inclined hole.
Adopt the noninductive coil of the inventive method coiling to be designed to even level.Specifically, commutation position and forward, the reverse two parts winding to two, four, six, eight layers of noninductive coil disposes with following rule:
(1) to two layer winding, commutation when ground floor finishes, the second layer subtracts circle.
(2) to four layers of winding, twice commutation when ground floor and three-layered node bundle.
(3), two kinds of commutations and allocation plan are arranged to six layers of winding:
First kind, twice commutation when ground floor and the 4th layer of coiling end, layer 6 subtracts circle.
Second kind, three commutations when ground floor, the 3rd layer and layer 5 coiling finish, layer 6 subtracts circle.
(4) to eight layers of winding coil, twice commutation when the second layer and layer 6 coiling end.
The design example of above commutation position and the configuration of positive and negative two parts winding has been considered above-mentioned every basic principle.If the noninductive coil winding only is one deck, when adopting winding method of the present invention, the commutation post can only be set, in the middle of coil so that the distance of forward and reverse two parts winding widens, cause the inductance of whole winding relatively large, therefore generally do not use the inventive method to make one deck noninductive coil winding.
Use the superconducting switch of the inventive method coiling, we are referred to as interlayer counter-rotating superconducting switch, and it is two-layer that its design feature is that coil windings has at least, adopts the even level structure; Whole winding is divided into forward coiling part and oppositely coiling partly and this two-part volume is equal or equate that substantially this commutation counter-rotating is carried out once at least during coil winding; Be provided with some commutation posts on the end plate of coil main framing, go into wire casing and go out wire casing, there are front groove and back groove in commutation post both sides.
The number and the position of commutation post are determined as required, if the structure of coil finishes the back commutation at the even numbers layer, the commutation post is located on the end plate at wire casing place, if finish the back commutation at the odd number layer, the post that then commutates is located on another end plate.
If set out wire casing on the bottom plate of main framing, generally be like this design: if coil interlayer commutation number of times is an odd number, the incline direction that then goes out wire casing is with to go into wire casing consistent, and go out wire casing and go into wire casing can be shared; If interlayer commutation number of times is even numbers, the incline direction that then goes out wire casing is with to go into wire casing opposite.Go into wire casing and go out wire casing and also can be designed to inclined hole.
The design of superconducting switch main framing also will be considered with the fixing of whole magnet system and install, and this point is different different because of the structure of system and device.
The noninductive coil that the single winding of interlayer of the present invention commutation counter-rotating is made, can whole winding regard as by forward winding part and oppositely winding part two parts form.These two parts are radially divided and mutually nested, and two parts have identical coefficient of self-inductance.By electromagnetic induction principle as can be known, if positive and negative two-part self-induction value equates that and the mutual inductance value between two parts also equates that with separately self-induction value then the induction coefficient of whole winding is zero.The coil of a reality can reduce the difference of above-mentioned each amount so that whole winding only has atomic little self-induction as far as possible.To the coil of collocation fully, can accomplish that the mutual inductance between positive and negative two parts only has fine difference with separately self-induction, make total induction coefficient of coil be approximately zero.To the coil that can not arrange in pairs or groups fully, also can make the difference of mutual inductance and separately self-induction between positive and negative two parts reduce to minimum, so the induction coefficient of coil reduce to minimum by volume compensation and the collocation of suitable position.Adopt the noninductive coil of the single winding coiling of interlayer commutation counter-rotating of the present invention to compare with the noninductive coil that double wound is made, the two small coefficient of self-inductance is at the same order of magnitude, but the uniformity of internal stress and whole stability all surpass the noninductive coil that double wound is made.The single winding of interlayer commutation counter-rotating has overcome the drawback of double wound, for adopting hard heavy gauge wire to make big capacity superconducting switch and other noninductive coil provides feasible effective method, has improved the quality and the operational reliability of product.
Description of drawings
Fig. 1 is the single winding coiling noninductive coil schematic diagram of interlayer commutation counter-rotating of the present invention;
Fig. 2 is the structure chart of thermally controlled interlayer counter-rotating superconducting switch;
Fig. 3 is the connection layout of secondary skeleton and main framing in the coiling of interlayer counter-rotating superconducting switch;
Fig. 4 is the configuration design of the positive and negative two parts winding of noninductive coil of employing coiling of the present invention.
Wherein Fig. 4-A is the double-layer winding noninductive coil,
Fig. 4-B is four layers of winding noninductive coil,
Fig. 4-C is six layers of winding noninductive coil (ground floors and the 4th layer for key stratum),
Fig. 4-D is eight layers of winding noninductive coil.
Embodiment
Below in conjunction with the accompanying drawing illustrated embodiment, further specify the inventive method and typical products and its.
The single winding explanation of embodiment 1. interlayers commutation counter-rotating
An embodiment as shown in Figure 1, the skeleton of interlayer counter-rotating noninductive coil has upper head plate 14, bottom plate 17, the centre links to each other with cylindrical tube 18 and is integrated.Commutation post 12 is arranged on the upper head plate 14, and there are front groove 11 and back groove 13 in commutation post both sides, have into wire casing 19 on the bottom plate 17.The lead of desiring coiling imports skeleton by the wire casing 19 of going on the bottom plate 17, coil winding machine drives skeleton (overlooking) rotation clockwise, it is preceding around layer 16 (supposing that it is the commutation inversion layer) to lay out commutation, after this layer coiling finishes, lead is drawn by the back groove 13 of commutation post 12 1 sides, change coil winding machine rotation direction (promptly becoming counter-clockwise direction) then, lead is walked around commutation post 12, front groove 11 by commutation post opposite side draws back skeleton, after finishing switch operation, start the coil winding machine coiling and go out the commutation back around layer 15.To note keeping the tension force of lead during change coil winding machine rotation direction.
Embodiment 2. thermally controlled interlayers counter-rotating superconducting switch
Fig. 2 is an example of thermally controlled superconducting switch.Upper head plate 31, cylindrical tube 33, bottom plate 37 is formed main framing.Commutation post 32 is arranged on upper head plate, and there are front groove 321 and back groove 322 in commutation post both sides.Have into wire casing 36 on the bottom plate 37.The main framing center is a mesopore 38.Superconducting line winding 34 and heater strip winding 35 are arranged on the main framing.Superconducting line winding 34 separated into two parts, promptly interior winding 341 and outer winding 342.Heater strip winding 35 is clipped between inside and outside superconducting line winding 341 and 342.Because technique for coiling needs, be used for fixing the blind screwhole 39 of secondary skeleton on the upper head plate in addition.
For making heater strip winding 35 at when energising noninductive up-flow and reduce its influence to external world, heater strip winding 35 also is noninductive coiling.Its commutation post can shared superconducting switch the commutation post, but to note insulation with superconducting line,
Need use secondary skeleton during coiling heater strip winding 35.Its effect is to be used for temporarily depositing as yet not around intact superconducting line, so that at the mid portion coiling heater strip of coil, and treating on the secondary skeleton is rotated together around lead.Fig. 3 has shown the type of attachment of secondary skeleton 20 and main framing 10.Secondary skeleton 20 is made up of upper/lower terminal plate and cylindrical tube, wherein a side end panel to consider with main framing fix and have that cross-line uses go into wire casing 201.This is gone into, and wire casing 201 should communicate with the front groove 321 on the main framing 10 and outlet direction is consistent, and its degree of depth should reach and the face of cylinder, goes into wire casing corner and seamlessly transits.After completing, generally secondary skeleton to be removed superconducting switch.In the present embodiment, heater strip is positioned at superconducting switch coil windings middle part, need dispose secondary skeleton during coiling.If the Position Design of heater strip at superconducting switch coil innermost layer or outermost layer, then need not secondary skeleton during coiling.The cylindrical tube of main framing lengthening also can be deposited treat, generally elongated portion will be removed after finishing but manufacture at switch around lead.Can reuse when using the benefit of secondary skeleton to be batch making.
Embodiment 3. double-deck noninductive coil windings
Shown in Fig. 4-A, adopt the double-deck noninductive coil winding of the inventive method coiling, commutation when the ground floor coiling finishes, the second layer subtracts circle.Ground floor is a forward coiling part, and the second layer is reverse coiling part.Being divided into forward coiling part than highlights among the figure, is reverse coiling part than dark-part.
4. 4 layers of noninductive coil winding of embodiment
Shown in Fig. 4-B, adopt four layers of noninductive coil winding of the inventive method coiling, the commutation inversion layer is ground floor and the 3rd layer.Ground floor and the 4th layer are forward coiling part, and the second layer and the 3rd layer are reverse coiling part.Being divided into forward coiling part than highlights among the figure, is reverse coiling part than dark-part.
5. 6 layers of noninductive coil winding of embodiment (ground floor and the 4th layer are the commutation inversion layers)
Shown in Fig. 4-C, adopt six layers of noninductive coil winding of the inventive method coiling, the commutation inversion layer is ground floor and the 4th layer.Ground floor, layer 5 and layer 6 are forward coiling part, and the second layer, the 3rd layer and the 4th layer are reverse coiling part.Because the volume of forward coiling part is greater than the volume of reverse coiling part, so layer 6 should suitably reduce the number of turn.Being divided into forward coiling part than highlights among the figure, is reverse coiling part than dark-part.
6. 6 layers of noninductive coil winding of embodiment (first and third, five layer is the commutation inversion layer)
Adopt six layers of noninductive coil winding of the inventive method coiling, the commutation inversion layer is ground floor, the 3rd layer and layer 5.Ground floor, the 4th layer and layer 5 are forward coiling part, and the second layer, the 3rd layer and layer 6 are reverse coiling part.Because the volume of reverse coiling part is greater than the volume of forward coiling part, so layer 6 should suitably reduce the number of turn.
7. 8 layers of noninductive coil winding of embodiment
Shown in Fig. 4-D, adopt eight layers of noninductive coil winding of the inventive method coiling, the commutation inversion layer is the second layer and layer 6.Ground floor, the second layer, layer 7 and the 8th layer are forward coiling part, and the 3rd layer, the 4th layer, layer 5 and layer 6 are reverse coiling part.Being divided into forward coiling part than highlights among the figure, is reverse coiling part than dark-part.
The interlayer commutation counter-rotating superconducting switch that adopts patent of the present invention to manufacture and design successfully has been applied on the kilo-ampere level superconducting magnet system.Campaign shows, its stable performance, and operation is normal, and technical indicator all reaches designing requirement.
Claims (9)
1. the winding method of a noninductive coil-single winding of interlayer commutation counter-rotating is characterized in that adopting the single line coiling and the counter-rotating coiling that commutates in winding process, and this commutation reverse turn operation at least once carries out when the coiling of commutation inversion layer finishes; The definite of commutation inversion layer should make the forward coiling of whole winding partly equal with the volume of reverse coiling part or equal substantially; The noninductive coil of institute's coiling is designed to even level, is at least two-layer; When total number of plies can be eliminated by 4, forward coiling part can be arranged in pairs or groups fully with reverse coiling part, and promptly its forward coiling part and reverse coiling volume partly equate; When other situation can not be arranged in pairs or groups fully, should reduce the number of turn at outermost layer, the volume of forward coiling part and reverse coiling part is equated substantially.
2. the winding method of noninductive coil as claimed in claim 1 is characterized in that, to the two layer winding coil, and commutation when the ground floor coiling finishes, the second layer subtracts circle; To four layers of winding coil, commutation when ground floor and the 3rd layer of coiling end; To eight layers of winding coil, commutation when the second layer and layer 6 coiling end.
3. the winding method of noninductive coil as claimed in claim 1 is characterized in that, to six layers of winding coil, and commutation when ground floor and the 4th layer of coiling end, layer 6 subtracts circle; Or commutation when ground floor, the 3rd layer and layer 5 coiling finish, layer 6 subtracts circle.
4. the winding method of noninductive coil as claimed in claim 1 is characterized in that, in order to realize switch operation, is provided with some commutation posts on the end plate of coil main framing, goes into wire casing and goes out wire casing, and there are front groove and back groove in commutation post both sides.
5. with the superconducting switch of the single winding coiling of interlayer commutation counter-rotating, it is characterized in that whole superconducting coil winding is an even level, has at least two-layer; Whole winding is divided into forward coiling part and reverse coiling part, and forward coiling part and oppositely the volume of coiling part equate or equate substantially; Be provided with the commutation post on the end plate of coil main framing, go into wire casing and go out wire casing, there are front groove and back groove in commutation post both sides.
6. superconducting switch as claimed in claim 5 is characterized in that, the position of commutation post is to determine like this: if finish the back commutation in the coiling of even numbers layer, the commutation post is on the end plate at wire casing place; If finish the back commutation in the coiling of odd number layer, the post that then commutates is on another end plate.
7. superconducting switch as claimed in claim 5 is characterized in that, goes into wire casing and goes out wire casing all on same end plate; When commutation number of times when being odd number, the incline direction that goes out wire casing is with to go into wire casing consistent, and go out wire casing and go into wire casing can be shared; When the commutation number of times was even numbers, the incline direction that then goes out wire casing was opposite with the incline direction of going into wire casing.
8. superconducting switch as claimed in claim 5 is characterized in that, when superconducting coil was double-layer winding, the coiling direction of the ground floor and the second layer was opposite; When being four layers of winding, ground floor is identical with the 4th layer coiling direction, is forward, and the second layer is identical with the 3rd layer coiling direction, for oppositely; When being eight layers of winding, ground floor, the second layer, layer 7 are identical with the 8th layer coiling direction, are forward, and the coiling direction of the 3rd layer, the 4th layer, layer 5 and layer 6 is identical, for oppositely.
9. superconducting switch as claimed in claim 5 is characterized in that, when superconducting coil was six layers of winding, the coiling direction of ground floor, layer 5 and layer 6 was identical, is forward, and the second layer, the 3rd layer of coiling direction with the 4th layer are identical, for oppositely; Also can be that ground floor, the 4th layer of coiling direction with layer 5 are identical, be forward, the second layer, the 3rd layer of coiling direction with layer 6 be identical, for oppositely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98117777A CN1095591C (en) | 1998-09-10 | 1998-09-10 | Method for winding non-inductive winding and superconductor switch wound by it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98117777A CN1095591C (en) | 1998-09-10 | 1998-09-10 | Method for winding non-inductive winding and superconductor switch wound by it |
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| CN1247369A CN1247369A (en) | 2000-03-15 |
| CN1095591C true CN1095591C (en) | 2002-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN98117777A Expired - Fee Related CN1095591C (en) | 1998-09-10 | 1998-09-10 | Method for winding non-inductive winding and superconductor switch wound by it |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895284A (en) * | 2010-07-13 | 2010-11-24 | 西南交通大学 | Electromagnetic control type superconducting switch with quick connection and disconnection |
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| CN102054623B (en) * | 2010-11-03 | 2013-04-03 | 中国科学院电工研究所 | Thermally-controlled superconducting switch |
| CN102610352B (en) * | 2012-03-06 | 2013-09-18 | 中国科学院电工研究所 | Non-inductive coil for high-temperature superconducting resistance-type current restrictor |
| CN104078220B (en) * | 2014-07-29 | 2016-06-08 | 电子科技大学 | Inductance and the compound super conducting electric reactor of resistance |
| CN104579280A (en) * | 2014-11-18 | 2015-04-29 | 中国科学院电工研究所 | Superconductive switch for conducting cooling superconductive magnet |
| CN106298153B (en) * | 2016-08-22 | 2018-07-17 | 中国科学院电工研究所 | A kind of cake-shaped high-temperature superconductive noninductive coil |
| CN109360706A (en) * | 2018-11-05 | 2019-02-19 | 杭州佩伟拓超导磁体技术有限公司 | A kind of noninductive coil and its winding method |
| CN111404132A (en) * | 2020-03-23 | 2020-07-10 | 北京交通大学 | Adjustable inductance solenoid type superconducting current limiter |
| CN112164542A (en) * | 2020-08-26 | 2021-01-01 | 北京交通大学 | CORC cable with transposition of adjacent layers |
| CN113363046B (en) * | 2021-05-26 | 2023-01-17 | 中国科学院高能物理研究所 | Superconducting undulator and wire changing method thereof |
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| US4355459A (en) * | 1979-03-10 | 1982-10-26 | Teruo Takahashi | Method of coiling a wire in a tube |
| CN85109027A (en) * | 1984-11-09 | 1986-05-10 | 株式会社北斗制作所 | The apparatus and method for of multi-layered hollow coil and manufacturing thereof |
| US4904970A (en) * | 1988-02-17 | 1990-02-27 | General Electric Company | Superconductive switch |
| CN1160275A (en) * | 1996-03-18 | 1997-09-24 | 陈坚胜 | Non-inductive coil |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4355459A (en) * | 1979-03-10 | 1982-10-26 | Teruo Takahashi | Method of coiling a wire in a tube |
| CN85109027A (en) * | 1984-11-09 | 1986-05-10 | 株式会社北斗制作所 | The apparatus and method for of multi-layered hollow coil and manufacturing thereof |
| US4904970A (en) * | 1988-02-17 | 1990-02-27 | General Electric Company | Superconductive switch |
| CN1160275A (en) * | 1996-03-18 | 1997-09-24 | 陈坚胜 | Non-inductive coil |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895284A (en) * | 2010-07-13 | 2010-11-24 | 西南交通大学 | Electromagnetic control type superconducting switch with quick connection and disconnection |
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| CN1247369A (en) | 2000-03-15 |
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