EP2304742A1 - Verfahren zur herstellung einer spule aus einem blech und spule - Google Patents
Verfahren zur herstellung einer spule aus einem blech und spuleInfo
- Publication number
- EP2304742A1 EP2304742A1 EP09775891A EP09775891A EP2304742A1 EP 2304742 A1 EP2304742 A1 EP 2304742A1 EP 09775891 A EP09775891 A EP 09775891A EP 09775891 A EP09775891 A EP 09775891A EP 2304742 A1 EP2304742 A1 EP 2304742A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- spacers
- plate
- sheet
- turns
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/041—Printed circuit coils
- H01F41/043—Printed circuit coils by thick film techniques
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
Definitions
- the invention relates to a method for producing a coil and to a coil, as used for example in magnetic resonance imaging (synonym: magnetic resonance tomography, MRI).
- Magnetic resonance imaging has been used as an imaging technique for years in medicine and biophysics.
- the object is exposed to a strong, constant magnetic field.
- the nuclear spins of the atoms which were previously randomly oriented, align themselves in the object.
- High-frequency waves can now stimulate these "ordered" nuclear spins to a specific vibration (resonance frequency).
- this oscillation generates the actual measurement signal (response signal), which is recorded by means of suitable receiver coils.
- Some investigations on the living object require extremely small coils. These are coils with a small distance between the individual turns to each other while having a small material cross-section and thin turns. Thin sheets are used as starting material in the production of the coil. In this initial situation, the above-mentioned production techniques fail. For example, it is not possible to simply mill a flat coil out of a thin sheet or to cut it out with a laser. The sheet would become unstable and the coil would lose their shape. However, in order to generate electromagnetic (radio frequency) fields, coils with tight turns and geometries of thin, metallic materials dictated by calculations are needed. To produce a thin sheet with very low intrinsic stability such that a coil results from this, is not possible with the mentioned techniques.
- the object of the invention is to provide a further method for producing a coil, which does not have the stated disadvantages of the prior art. Another object of the invention is to provide a corresponding coil and to specify its intended use.
- the method for producing a coil from a sheet comprises the steps:
- the process for producing the coil is completed in principle.
- the metal sheet for the coil is stabilized by the spacers, in particular in the area of the turns.
- the coil is released again from the spacers. Only optionally, the prepared coil geometry is fixed in addition to turns before loosening and cleaned after loosening.
- a pad is preferably milled from a metallic block.
- the carrier plate forms in the region of the spacers from the negative bottom surface of the coil and is used during the preparation of the coil on the arranged in the carrier plate spacers as the support surface.
- the support plate has for this purpose on its surface the spacers, preferably in the form of individual possibly narrow ribs, webs or strips for the coil plate. It is conceivable to provide narrow, button-like structures as spacers.
- the spacers can preferably be worked out of the material of the carrier plate, for example by milling. They have to be that kind of that the coil plate remains firmly connected to the spacers during its subsequent machining.
- the spacers are arranged in or on the carrier plate.
- the spacers support the form unstable turns of the coil to be made during their manufacture.
- the spacers are narrow, so that only a comparatively small contact surface bears against the underside of the coil plate in the area of the later turns.
- the spacers have a height so that the coil plate can be placed on the spacers and secured to the upper edge.
- the spacers are adapted to the two- or three-dimensional geometry of the coil plate to be supported in the region of the turns, so that the sheet metal can be fastened to the upper edge of the spacer.
- the height of the spacers and the surface on which they are arranged on or in the carrier plate is adapted to the coil geometry to be made.
- the strength of the spacers is z. B. 0.3 millimeters.
- the height of the spacers amounts to z. B. to about 4 millimeters. It is preferably identical for all spacers, provided that a flat coil plate is attached thereto and then edited. Of course, however, deviating dimensions may also be chosen, depending on the material used and depending on how the coil geometry and the thickness as well as the spacing of the turns are formed.
- the height of the spacers is adapted to this geometry of the sheet, so that they can all be fastened to the sheet and support it during its further processing.
- the sheet metal for the coil is placed on the spacers of the support plate and fastened with these. Since the spacers from their height represent a negative to the coil plate, the sheet nestles for the coil in the area of the later turns to the spacers. Spacers are preferably fastened to the metal sheet in the entire area of the turns, in such a way that they retain their shape during the production of the turns.
- a material with a low heat capacity is preferably selected.
- brass can be chosen as the material.
- Brass advantageously has a low heat capacity, so that for the purpose of maintaining the shape of the spacer, a soldering method for fixing the coil plate on the spacers of the support plate can be selected.
- the coil plate can, for. B. soldered with a silver solder on the spacers.
- a soldering method a soft or brazing method can be used.
- the necessary heat can be generated with the soldering iron, with the soldering flame, a heating plate or in a soldering oven.
- the sheet may be secured to the spacers of the support plate.
- the coil plate can also be glued to the spacers of the support plate. Then, the material of the carrier plate and the spacers made thereof need not necessarily have a low heat capacity.
- the material of the coil plate and the carrier plate and the working method are coordinated to secure the coil and edit.
- the sheet metal for the coil comes as a material in particular copper as a standard material in question.
- another material can be chosen in particular another metal, z. As aluminum.
- the finished coil is referred to with their turns in the coil plate on the support plate.
- the coil geometry includes the number of coil turns, their thickness, thickness and the distances of the turns to each other and in curved three-dimensional coils and the three-dimensional surface.
- the attached coil plate is always so stabilized at least in the field of turns by the spacers of the support plate that z. B. can be processed with a production laser or a milling machine.
- the laser processing with a fineblank laser generates by laser cutting the fine separation paths, which separate the individual coil windings electrically and spatially from each other.
- thickness and laser power in the range of several 1/10 mm to 1/100 mm, the laser enables separation slots.
- the coil plate is cut particularly advantageously with the aid of an ND-YAG laser in the desired shape.
- the coil geometry and turns are generated in the coil plate.
- the narrowest cut is the cutting width of the laser and is about 1/100 millimeter.
- the strength of the individual turns is advantageously in the range of 0.05-1 millimeters.
- the coil geometry is milled.
- the (coil) sheet is held by the soldered or otherwise fixed structure of the support plate with spacers in its form. The spacers of the substructure do not disturb the laser or the milling tool or any other tool for producing the coil geometry.
- the coil geometry is then fixed.
- fixing the turns are permanently spatially and electrically separated from each other. In this way, the coil can be separated after the spacers without loss of form.
- an adhesive for this it is possible to apply only an adhesive to the coil geometry and then let it cure. It can be chosen for this purpose a polymerization adhesive.
- the adhesive can be applied to the coil plate immediately after the production of the turns and this can then be separated from the carrier plate after curing.
- the insulator may be a plastic film or even a pure potting compound of adhesive, provided that care is taken that a sufficiently stabilizing layer is formed on the coil surface.
- a flat coil is preferably a thin plastic film or sheet of z.
- acrylic glass and glued with Acrifix 190 ® on the coil For curved, three-dimensional coils, this fixing negative mold must previously from a thicker plastic plate, for. B. by a milling operation, be worked out. Alternatively, initially the entire coil can be embedded in plastic and then the desired surface shape by z. B. a milling operation will be worked out.
- the plastic carrier is filled with a suitable adhesive, for. B. Acrifix 190 ® connected to the coil on the support plate.
- the adhesive connects the selected plastic with the Coil material sufficiently strong and also penetrates well into the fine separation gaps of the coil in order to permanently isolate these and the windings from each other.
- the carrier plate with the spacers is released from the optionally fixed coil plate.
- the surface of the coil is then preferably freed from the remainder of the spacers by milling.
- the adhesive that has passed through in the direction of the carrier plate during the bonding process is likewise removed.
- the coil geometry can be fixed with any thin plastic plate and a suitable, in particular low-viscosity adhesive.
- the adhesive penetrates as an insulator in the resulting separation slot between the turns of the coil and fixes them permanently electrically and spatially from each other.
- a fixation can be dispensed with, provided that the material and the geometry of the coil sufficiently own stability.
- the method does not necessarily have to include a fixation of the finished coil geometry depending on these parameters.
- the preferably fixed coil geometry is then released by a separation process from the carrier plate and the spacers.
- a mechanical separation method is advantageously used.
- the surface of the exposed and preferably fixed coil is optionally cleaned.
- the support plate in the region of the webs can be sawed off in advance at a sufficient distance from the coil plate coarse.
- the carrier plate may need to be completely chipped.
- the uncovered coil is made of a thin sheet metal with narrow and narrowly separated turns, preferably mounted on a non-conductive plastic carrier material that can be installed in the application system and electrically connected.
- the described method is suitable for plane coils. As shown, without limitation, it can also be used for the production of curved three-dimensional coil geometries.
- the carrier plate has the spacer for the coil plate in order to support the coil plate in the region of the coil to be made and edit.
- the carrier plate itself can also have larger dimensions than the coil plate or the later coil geometry in order, for example, to handle it better.
- a carrier plate with the spacers and the thin sheet attached thereto for a manufacturing method of a coil represents an advance. It is also conceivable to supply the still attached to the spacers coil their application purpose.
- Particularly advantageous coils are provided with turns at a distance of less than 1 millimeter.
- the coils are preferably fixed by an adhesive or are fixed by means of an adhesive on a non-conductive plastic carrier.
- 9 to 10 turns of a coil can be produced in a footprint of less than 5 cm 2 . It is conceivable to produce such coils on surfaces of less than 5 cm 2 by the method.
- whole coil systems comprising a plurality of coils, for. B. two or three individual coils, provided in a sheet in a single operation.
- These multiple coil systems already have the intended spatial arrangement to each other.
- the coils of the invention can, for. B. in a magnetic resonance tomograph in extremely cramped conditions. They regularly withstand very high currents of approx. 20 A in pulses of 1 ms.
- Fig. 1 Top view of a carrier plate with spacers.
- Fig. 2 Top view of assembly 21, comprising a fixed sheet on a support plate.
- Fig. 3 Top view of assembly 31, comprising a fixed sheet on a support plate after making the coil geometry.
- Fig. 4 Top view of an exposed coil, fixed on a plastic carrier.
- an arrangement 1 of support plate 4 and spacers 2, 3 is provided.
- the support plate 4 is made of brass.
- the support plate 4 may be considered as a support plate for the coil plate (not shown).
- the carrier plate 4 represents in the region of the spacers a negative mold for the coil geometry to be produced.
- the support plate has a total thickness of 10 millimeters (including the spacers), a length of 47 millimeters and a width of 32 millimeters.
- the surface of the carrier plate 4 with the spacers is produced by milling a brass block. For this purpose, slots of approximately 3 mm depth are milled into the surface of the material in the brass block in such a way that narrow webs having a wall thickness of approximately 0.3 mm are produced. These remain as spacers 2, 3 after the removal of the material.
- FIG. 1 therefore, 8 longer webs 2, of which only one is designated by reference numeral 2, shown.
- FIG. 1 moreover, 8 short webs 3, of which in turn only one is designated by reference numeral 3, are shown.
- the short and the long webs 3, 2 are arranged alternately to each other and form the spacers of the support plate 4.
- the webs 2, 3 represent in the further course of the process, the spacers to the sheet for the coil.
- a coil carrier Spacers and carrier plate made, which has the same three-dimensional surface structure as the sheet from which the coil is made.
- a sheet of copper in which the coil geometry is made, mounted on the spacers of the support plate, so that an assembly 21 of a support plate 24 with the spacers 22, 23 and a fixed copper sheet 25 is formed.
- the coil plate is placed on the top edge of the spacers and abuts against them.
- the sheet is referred to as coil plate 25. It has a thickness of 0.5 millimeters and a height and width of 32 millimeters each. This area coincides with the area in which the spacers are arranged.
- the coil plate 25 is soldered onto the spacers 22, 23 and held or stabilized in its shape.
- the necessary heat can be generated with a soldering iron, a soldering flame, a heating plate or a soldering oven in which the arrangement of coil plate and carrier plate is placed.
- the coil plate 25 is fastened to the carrier plate 24 via the spacers 22, 23, without the coil plate or the carrier plate having the spacers thereby deforming. It is ensured that the webs 22, 23 remain in shape during the heat development during the soldering process.
- the coil geometry is made in the fixed plate 25 by a laser cutting machine to provide arrangement 31.
- the soldered coil plate 35 is further stabilized by the support plate 34 with the spacers 32, 33 during cutting.
- the coil plate 35 remains in shape during this processing step and does not bend during the heat development, nor the supporting spacers.
- the dark slot separates the brightly illustrated turns 36.1 (lying inside) to 36.9 (lying outside).
- the laser processing generates by laser cutting the fine separation path, which electrically separate the individual brightly represented coil turns.
- a separating slot that is, a cavity present between the turns, of 0.03 mm has been generated.
- the strength of the turns is 0.05-1 millimeters.
- step 3 of the method the coil has been provided.
- the finished coil plate 35 has the required turns. Alone by means of these aforementioned three steps, very thin sheets can be processed and corresponding coils are produced.
- the outer dimensions of the sheet are then finished. After removing the cutting burr, the bobbin plate is cleared of machining residues. Optionally, it is also thoroughly cleaned.
- the coil geometry thus produced can be fixed.
- this step is to continue to stabilize the coil.
- a plastic carrier is glued to the coil plate 35 with the turns 36.1 to 36.9.
- the plastic carrier with a two-component polymerization adhesive (Acrifix 190 ® ) glued.
- a plate made of acrylic glass is used. This plate preferably has a thickness down to a 1/10 millimeter. It is understood that this plastic carrier must again have the same surface geometry as the coil.
- the plastic carrier made of acrylic glass is glued to the coil.
- the slots and turns are permanently spatially and electrically isolated from each other by the low-viscosity adhesive.
- the soldered carrier plate is separated from the fixed coil plate.
- the surface of the coil is freed from the residues of the carrier plate webs by milling.
- the adhesive that has passed through during bonding is also removed by milling.
- the support plate in the region of the webs can be sawed off in advance at a sufficient distance from the coil plate coarse.
- the end product is a coil 45 of copper fixed at least by the adhesive and having very narrow and very narrowly separated turns 46.1 to 46.9, which is arranged on an optionally non-conductive plastic carrier material made of acrylic glass 47.
- the coil is made by the described method from copper sheet of a thickness of 0.5 mm or even less. On an area of less than 9 cm 2 while 9.5 turns are placed with a thickness of 0.05 to 1 mm and separated by a separating slot of 0.03 millimeters.
- the coil plate and optionally its precursors are cleaned in an ultrasonic bath with suitable cleaning solution.
- a carrier plate must be used, which has spacers with a turn complementary surface shape to the plate for the coil.
- the individual processing steps for producing the carrier plate together with spacers are largely identical to the exemplary embodiment 1.
- the sheet metal for the coil is first produced from a block by milling on one side and thus adapted to the height of the spacers exactly. After attaching the sheet to all spacers this is further removed on the free surface to the desired geometry and then processed with a fine cutting laser for producing the coil geometry and turns.
- Such three-dimensional coil structures are fixed with a plastic plate in turn complementary thereto by means of adhesive or only by an adhesive and then released and cleaned, for example by milling from the spacers.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
- Coils Or Transformers For Communication (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008034067A DE102008034067A1 (de) | 2008-07-22 | 2008-07-22 | Verfahren zur Herstellung einer Spule aus einem Blech und Spule |
| PCT/DE2009/000835 WO2010009688A1 (de) | 2008-07-22 | 2009-06-17 | Verfahren zur herstellung einer spule aus einem blech und spule |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2304742A1 true EP2304742A1 (de) | 2011-04-06 |
Family
ID=41210619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09775891A Withdrawn EP2304742A1 (de) | 2008-07-22 | 2009-06-17 | Verfahren zur herstellung einer spule aus einem blech und spule |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20110109414A1 (de) |
| EP (1) | EP2304742A1 (de) |
| JP (1) | JP2011528854A (de) |
| DE (1) | DE102008034067A1 (de) |
| WO (1) | WO2010009688A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019114823A1 (de) * | 2019-06-03 | 2020-10-29 | Miele & Cie. Kg | Induktionsvorrichtung für ein Kochfeld, Verfahren zum Herstellen einer Induktionsvorrichtung und Kochfeld |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR890004585B1 (ko) * | 1980-09-11 | 1989-11-16 | 아사히가세이고교가부시키가이샤 | 마이크로코일(microcoil) |
| US4905358A (en) * | 1989-01-18 | 1990-03-06 | Motorola, Inc. | Thin film active trimmable capacitor/inductor |
| JP2752156B2 (ja) * | 1989-05-30 | 1998-05-18 | 株式会社東芝 | Mri装置用コイル部品の製造方法 |
| US5270656A (en) * | 1992-04-24 | 1993-12-14 | The Trustees Of The University Of Pennsylvania | Biplanar RF coils for magnetic resonance imaging or spectroscopy |
| US5922514A (en) * | 1997-09-17 | 1999-07-13 | Dale Electronics, Inc. | Thick film low value high frequency inductor, and method of making the same |
| US6311389B1 (en) * | 1998-07-01 | 2001-11-06 | Kabushiki Kaisha Toshiba | Gradient magnetic coil apparatus and method of manufacturing the same |
| JP4303837B2 (ja) * | 1998-07-01 | 2009-07-29 | 株式会社東芝 | コイルの製造方法 |
| JP2003347125A (ja) * | 2002-05-27 | 2003-12-05 | Sansha Electric Mfg Co Ltd | コイル |
| DE10307814B4 (de) * | 2003-02-24 | 2006-05-04 | Siemens Ag | Gradientenspulen und Verfahren zur Herstellung von Gradientenspulen für MRT-Systeme |
| WO2006130558A2 (en) * | 2005-06-01 | 2006-12-07 | The Board Of Trustees Of The University Of Illinois | Flexible structures for sensors and electronics |
-
2008
- 2008-07-22 DE DE102008034067A patent/DE102008034067A1/de not_active Withdrawn
-
2009
- 2009-06-17 WO PCT/DE2009/000835 patent/WO2010009688A1/de not_active Ceased
- 2009-06-17 US US12/737,355 patent/US20110109414A1/en not_active Abandoned
- 2009-06-17 JP JP2011519022A patent/JP2011528854A/ja not_active Withdrawn
- 2009-06-17 EP EP09775891A patent/EP2304742A1/de not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010009688A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20110109414A1 (en) | 2011-05-12 |
| JP2011528854A (ja) | 2011-11-24 |
| WO2010009688A1 (de) | 2010-01-28 |
| DE102008034067A1 (de) | 2010-01-28 |
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