CA1148229A - Inductive component and method for its production - Google Patents
Inductive component and method for its productionInfo
- Publication number
- CA1148229A CA1148229A CA000329091A CA329091A CA1148229A CA 1148229 A CA1148229 A CA 1148229A CA 000329091 A CA000329091 A CA 000329091A CA 329091 A CA329091 A CA 329091A CA 1148229 A CA1148229 A CA 1148229A
- Authority
- CA
- Canada
- Prior art keywords
- winding
- electrically conductive
- inductive component
- tape
- conductive winding
- 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.)
- Expired
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/04—Amorphous alloys with nickel or cobalt as the major constituent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
-
- 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
- H01F27/24—Magnetic cores
- H01F27/25—Magnetic cores made from strips or ribbons
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Materials Engineering (AREA)
- Electromagnetism (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Soft Magnetic Materials (AREA)
- Coils Or Transformers For Communication (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An inductive component, such as a transformer or a transducer, consisting of a high permeability magnetic material overlaying the electrical-ly conductive winding is provided. This soft magnetic material consists of an amorphous alloy and is composed of one or more of the following: iron, nickel, phosphorus, boron, silicon, carbon, aluminum, cobalt, chromium, molybdenum, titanium, vandium, and copper; which is formed into a thin tape for use in creating the soft magnetic windings. By creating these amorphous, highly permeable windings over the electrically conductive windings, a com-ponent is created which permits the utilization of greater amounts of the electrically conductive material in place of the more expensive magnetic material, relative to the output obtained.
An inductive component, such as a transformer or a transducer, consisting of a high permeability magnetic material overlaying the electrical-ly conductive winding is provided. This soft magnetic material consists of an amorphous alloy and is composed of one or more of the following: iron, nickel, phosphorus, boron, silicon, carbon, aluminum, cobalt, chromium, molybdenum, titanium, vandium, and copper; which is formed into a thin tape for use in creating the soft magnetic windings. By creating these amorphous, highly permeable windings over the electrically conductive windings, a com-ponent is created which permits the utilization of greater amounts of the electrically conductive material in place of the more expensive magnetic material, relative to the output obtained.
Description
; :
` BACKGR011ND OF T~IE INV~NTION
Field of the Invention The present invention relates to an inductive component, upon whose electrically conductive windings a tape consisting of high permeability magnetic material is wound.
Description of the Prior Art Conventional inductive components have a core of high magnetic permeability, which may be tape wound or which can consist of layers of plates, and which has electrical windings mounted upon said core. For ring-shaped cores, the windings are typically wound over the core in the form of toroid. Split tape-wound cores or cores of layers and perhaps glued plate packets can be inserted into the finished windings.
Inductive components such as transformers, chokes, and transducers are already known, in which the band-shaped core material consisting of high permeability material is wound onto the prefabricated electrical windings.
Prior to the mounting upon the windings, the tape-shaped core material is normally prewound to a similar diameter as it will later have on the winding.
It is subsequently heat-treated in order to remove mechanical stresses and finally, perhaps after additional rewinding, wound upon the winding. The completed wound core, which has the form of a ring-shaped core, encloses the portion of the electric winding corresponding with the width of its tape wind-ings, (see German Letters Patent 711,770; 722,211; 727,073; 729,918; 737,787;
and 915,588).
Although the degree of tape curvature must be kept to a minimum dur-ing the winding, a decrease in the magnetic properties as had existed after the heat-treatment cannot be avoided during the winding. In silicon-iron alloys, the decrease can be held within tolerable limits, however, a consider-able quality decrease must be acknowledged when utilizing the magnetically -1- ~F
.
8~
high duty nickel-iron alloys, (R. Bauer, "Transducer", Berlin/Gottingen/
Heidelberg, (Springer-Publishing House), 1953, Page 55, Paragraph 3).
SUM~RY OF THE INVENTION
It is an object of this lnvention to further improve an inductive component onto whose electrically conductive winding, tape consisting of high permeability material is wound. This is inventively obtained where the tape of high permeability material consists of an amorphous a]loy.
As is known, amorphous metal alloys can be produced by having the `~ molten alloy cooled so rapidly that solidification without crystallization occurs. These amorphous alloys can be immediately obtained in the form of thin tapes, whose thickness, for example, can be a few one-hundreths of a ; millimeter and whose width can be several millimeters. These amorphous alloys can be distinguished from the crystalline alloys by utilizing x-ray defraction analysis. In contrast to the crystalline materials which exhibit character-istic sharp defraction lines, the amorphous metal alloys demonstrate an intensity in the x-ray defraction picture which alters only slowly with the defraction angle, which result is similar to that of liquids or common glass.
Depending upon the production requirements, the amorphous alloys can be com-pletely amorphous or can comprise a two-phase mixture of the amorphous and the crystalline state. The term "amorphous metal alloy", is to be generally understood as an alloy which is at least 50%, or advantageously at least 80%, amorphous.
Each amorphous metal alloy has a characteristic temperature, the so-called crystallization temperature. If the amorphous alloy is heated to or above said temperature~ it changes into the crystalline state. With heat-~ treatments below the crystallization temperature, however, the amorphous - state is retained.
The high permeability amorphous metal alloys presently known have ':
` BACKGR011ND OF T~IE INV~NTION
Field of the Invention The present invention relates to an inductive component, upon whose electrically conductive windings a tape consisting of high permeability magnetic material is wound.
Description of the Prior Art Conventional inductive components have a core of high magnetic permeability, which may be tape wound or which can consist of layers of plates, and which has electrical windings mounted upon said core. For ring-shaped cores, the windings are typically wound over the core in the form of toroid. Split tape-wound cores or cores of layers and perhaps glued plate packets can be inserted into the finished windings.
Inductive components such as transformers, chokes, and transducers are already known, in which the band-shaped core material consisting of high permeability material is wound onto the prefabricated electrical windings.
Prior to the mounting upon the windings, the tape-shaped core material is normally prewound to a similar diameter as it will later have on the winding.
It is subsequently heat-treated in order to remove mechanical stresses and finally, perhaps after additional rewinding, wound upon the winding. The completed wound core, which has the form of a ring-shaped core, encloses the portion of the electric winding corresponding with the width of its tape wind-ings, (see German Letters Patent 711,770; 722,211; 727,073; 729,918; 737,787;
and 915,588).
Although the degree of tape curvature must be kept to a minimum dur-ing the winding, a decrease in the magnetic properties as had existed after the heat-treatment cannot be avoided during the winding. In silicon-iron alloys, the decrease can be held within tolerable limits, however, a consider-able quality decrease must be acknowledged when utilizing the magnetically -1- ~F
.
8~
high duty nickel-iron alloys, (R. Bauer, "Transducer", Berlin/Gottingen/
Heidelberg, (Springer-Publishing House), 1953, Page 55, Paragraph 3).
SUM~RY OF THE INVENTION
It is an object of this lnvention to further improve an inductive component onto whose electrically conductive winding, tape consisting of high permeability material is wound. This is inventively obtained where the tape of high permeability material consists of an amorphous a]loy.
As is known, amorphous metal alloys can be produced by having the `~ molten alloy cooled so rapidly that solidification without crystallization occurs. These amorphous alloys can be immediately obtained in the form of thin tapes, whose thickness, for example, can be a few one-hundreths of a ; millimeter and whose width can be several millimeters. These amorphous alloys can be distinguished from the crystalline alloys by utilizing x-ray defraction analysis. In contrast to the crystalline materials which exhibit character-istic sharp defraction lines, the amorphous metal alloys demonstrate an intensity in the x-ray defraction picture which alters only slowly with the defraction angle, which result is similar to that of liquids or common glass.
Depending upon the production requirements, the amorphous alloys can be com-pletely amorphous or can comprise a two-phase mixture of the amorphous and the crystalline state. The term "amorphous metal alloy", is to be generally understood as an alloy which is at least 50%, or advantageously at least 80%, amorphous.
Each amorphous metal alloy has a characteristic temperature, the so-called crystallization temperature. If the amorphous alloy is heated to or above said temperature~ it changes into the crystalline state. With heat-~ treatments below the crystallization temperature, however, the amorphous - state is retained.
The high permeability amorphous metal alloys presently known have ':
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the composition M Xl , wherein: M represents at least one of the metals iron, cobalt, and nic~el; X represents at least one of the so-called glass-forming elements boron, carbon, silicon, and phosphorous; and y lies between approximately 0.60 and 0.95. In addition to the above-mentioned metals M, the amorphous alloys can also contain additional metals, in particular titanium, zircon, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, palladium, platinum, copper, silver, or gold. In addi-tion to the glass-forming elements X or, if necessary, even in place of them, the elements aluminum, gallium, indium, germanium, tin, arsenic, antimony, bismuth or beryllium can be present, (compare, for example, German OS
2,546,676; 2,553,003; 2,605,615; 2,628,362; and 2,708,151).
For high permeability amorphous alloys, it generally holds true that with regard to their magnetic properties they are less sensitive to deformations for example, those occurring upon the winding of the tape onto an electrically conductive winding, than those tapes consisting of crystalline high permeability alloys, with regard to their magnetic properties.
A number of cobalt-containing, amorphous alloys, specifically, as they are disclosed in German OS 2,546,676 and 2,708,151, have a magneto-striction which is close to zero. These alloys can advantageously have the composition of CoaFebNicSidBePfCgAlh~ wherein 0.3 ~- a ~ 0.8, 0 ~ b C 0.1, o C c ~ 0.4, 0 ~ d ~ 0.3, 0 ~ e C 0.3, 0 ~ f ~ 0.25, 0 C g C 0.15, 0 C h ~ 0.1, and in addition, a + b + c + d + e + f + g + h = 1, 0.6 ' a + b + c, and ; 0.1 ~ d + e + f -~ g + h.
The magnetic properties of these alloys are very insensitive to deformations.
':
Tapes of such alloys can therefore be wound onto electrically conductive wind-ings after a preceeding heat-treatment or, if necessary, completely without such heat-treatment. Other high permeability, amorphous alloys, in particular such of the composition Fe ~ibMe PdB sifc Alh, wherein Me represents one or more of the metals cobalt, chromium, molybdenum, titanium, vanadium, copper, and ; 0.1 ' a C 0.9, ~ O ~ b ~ 0.6, - O ~ c ~ 0.4, O C d ~ 0.25, O C e C 0.3, O ~ f C 0.3, O c g ~ 0.15, and O ~ h ~ 0.1;
and also a + b + c + d + e + f + g + h = 1, 0.6 C a + b + c, and 0.1 ~ d + e + f + g + h, have a perceptible magneto-striction. However, they respond to a relaxation - annealing process at the relatively low temperatures of approximately 150 through 400C. The magnetic hysteresis losses for high frequencies, (for example 20 kHz), are relatively low in these alloys after the heat-treatment.
Thus, when using such alloys, the component can be subjected to a heat-treat-ment of between 150 and 400 C after the winding of the amorphous high permeability tape onto the prefabricated, electrically conductive winding, which has been provided with an insulation. Of course thi.s is true only as long as the remaining materials used for the component are stable at these temperatures.
It is particularly advantageous to design the electrically conductive winding in a ring-shape and to wind the tape of the amorphous alloy in such a toroidal shape that it largely surrounds or encases the electrically conductive winding, preferably as much as possible. Particularly suited therefor are amorphous tapes of not too wide a width, for example, of a width of 2 mm through to 5 mm as they are readily produced directly from the melt. These tapes can then be mounted onto the prefabricated, electrically conductive wind-ing in one or several layers in a similar fashion to the one used in con-ventional inductive components wound onto a prefabricated ring-shaped tape core. Additionally, the structure has the advantage that the high permeability, amorphous tape wound in toro-dal shape has a simultaneous magnetic screening effect as a shell core.
The electrically conductive winding can advantageously be produced of aluminum, whereby, in relation to copper, a considerable saving in weight results. Moreover, the individual windings can readily be insulated from one another in a manner unaffected by temperature changes, by means of an anodiz-ing layer at their surface. For larger components, foils or films of a synthetic material with the required temperature stability can also be utilized for insulation.
If the weight savings is not a decisive factor, copper can naturally be used for the electrically conductive winding. Insulation may then be accomplished by the use of a lacquer or a glass fiber casing, which is unaffected by temperature changes.
B~
The electrically conductive wlnding can be advantageously produced out of a tape material, preferably an aluminum tape, which can be wound similarly to the ring-shaped tape cores in a conventional component. With such tape winding a particularly high space Eactor, and thus a particularly compact design, can be obtained. The winding can also comprise several partial windings electrically separated from one another, for example, the primary and secondary winding of a transformer or transmittrr.
In order to obtain a high output with the smallest possible material use, it is particularly advantageous to select an approximately square cross section for the electrically conductive, ring-shaped winding which is to be provided with a toroidal-shaped winding of high permeability tape. An approximately rectangular cross section with a ratio of the side parallel to the winding axis relative to the side at right angle to the winding axis of approximately 2.5:1 through 1:1 is appropriate. It is also expedient to make the winding packet of high permeability tape so thick that half the diameter of the winding hole of the electrically conductive winding is filled by high permeability material. Additionally, the space factors of the two windings should be selected as great as possible if the smallest possible design volume is to be obtained with a prescribed maximum output of the component. Indeed, the maximum Otltput relative to volume unit increases with an increasing space factor. For a winding consisting of aluminum tape, space factors through to 0.9 can be obtained, and in the high permeability toroidal-shaped winding, space factors through 0.3 can be obtained. In order to simultaneously obtain the highest possible maximum output relative to weight it is also advantageous to select the ratio of exterior diameter relative to interior diameter of the electrically conductive winding of approximately between 1.3 and 3.5, most advantageously between 1.5 and 2.5.
In comparison to conventional components, more expensive high permeability material can therby ke saved in place of less expensive conductor material. Indeed, under the previously stated criteria for the geometric design of the component, the amount of high permeability material necessary for output unit decreases with an increasing ratio between the exterior and the interior diameter of the electrically conductive winding in the components, as the amount of conductor material increases. In conventional camponents, e.g. in a ring-shaped tape core provided with a toroidal-shaped electrically conductive winding, this relationship is reversed.
In accordance with this invention, there is provided an inductive com-ponent having an electrically conductive winding with a tape of high perme-ability magnetic ma~erial wound on said electrically conductive winding, charac-terized in that (a) the tape of high magnetic permeability consists of an amor-phous alloy, and (b) the electrically conductive winding is a ring-shaped elec-trically conductive winding having an appro~imately rectangular cross-section with a ratio of the side parallel to the winding axis relative to the side at a right angle to the winding axis, in the range of approximately 2.5:1 through l:l.
In accordance with another aspect of this invention, there is provided a method for producing an inductive component ~hich comprises: forming a winding of an electrically conductive material; insulating said electrically conductive winding; forming a winding of high magnetically permeable material about the electrically conductive winding; and heating the component thus formed to a te~,perature of between 150 and 400 & in order to mechanically relax the magnet-ically permeable material.
The invention is to be more precisely explained with the aid of several Figures and examples. Various other objects, advantages, and features of the present invention will became 2~
readily apparent from the ensuing detailed description and the novel features will be particularly pointed out in the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
_ _ _ . _ Figure 1 is a perspective view of a preferred embodiment.
Figure 2 is a schematic sectional view taken along line II-II in Figure 1.
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Figure 3 which is located on the second page of drawings is a graph showing the relationship between the ratio of mass relative to output and the ratio of the exterior diameter relative to the interior diameter, for a com-ponent according to Figures 1 and 2, with comparison curves for a conventional component addecl.
Figure 4 is a graph similar to Figure 3 but showing in addition the relationship between the ratio of volume to output and the ratio of exterior diameter relative to the interior diameter, for a component according to Figures 1 and 2, with comparison curves for a conventional component added.
Figure 5 is a view similar to Figure 2 showing an alternate embodi-ment of this invention.
DESCRIPTIO~ OF THE PREFERRED EMBODIMENTS
. .
A transformer according to this invention is more precisely explain-ed with the aid of Figures 1 and 2 in the following sample embodiment. The ring-shaped electrically conductive winding of this transformer is subdivided into two partial windings, a primary and a secondary winding and has a square cross section and is toroidally surrounded by a winding of high permeability, amorphous tape.
The transformer is designed for a primary voltage of 300 V, a secondary voltage of 48 V and a transmittable output of 670 W at a frequency of 20 kH~. The ambient tempPrature is to be 60C, the permissible overtemper-ature is 60 K The magnetic losses of the high permeability winding amount to 28 W/kg.
Proceeding Lrom the operating conditions, the following geometric data were determined for the transformer: , Interior diameter of the transformer d = 1.4 cm Exterior diameter of the transformer d = 7.9 cm Height of the transformer h = 3.4 cm ~ --~8'~:~9 Interior diameter of the electricallydl= 2.8 cm conductive winding Exterior diameter of the electricallyd2= 6.8 cm conductive winding Height of the electrically conductive winding h2= 2.0 cm Magnetic iron cross section 0.9 cm2 Effective conductor cross section 3.4 cm Average iron path length 15.1 cm Average electric winding length 9.8 cm.
The transformer was constrùcted with a primary winding 1 having 122 windings of 0.08 mm thick and 18 mm wide aluminum tape and a secondary winding 2 with 20 windings of 0.45 mm thick and 18 mm wide aluminum tape. A
` 19 mm wide and 0.2 mm thick polyimide film was placed between the windings as insulation which, for the sake of clarity, was not separately illustrated in Figure 2. The space factor of the winding consisting of the two partial windings 1 and 2 and having a square cross section is approximately 0.85. The ratio of exterior diameter d2 relative to interior diameter dl of the winding is 2.4.
A polyimide film 3 is again used as cover insulation of the electrically conductive windings 1, 2 said film may be applied on the winding by the use of heat shrinkable plastic.
Around the winding 1, 2 thus insulated, 900 windings 4 consisting of 2 mm wide and 0.05 mm thick tape of high permeability, amorphous alloy FeO 40Nio 40P0 14Bo 06 were then wound around in such a manner that they surrounded the electrically conductive winding 1, 2 in a toroidal shape.
Only the point at which the electric connections 5 are guided out of primary winding 1 and secondary winding 2, is not covered by the high permeability winding. The free end of the amorphous tape can simply be pushed underneath an adjacent winding in order to maintain the high permeability winding in _9_ - - . . ~ . .,: . ~
2~
place. The high permeability winding, whose space factor i9 approximately O.Z, fills approximately one-half of the diameter dl, (which is the winding hole of the electrically conductive winding).
To achieve mechanical relaxation and to improve the dynamic proper-ties, particularly to decrease the magnetic losses of the high permeability winding, the completely wound transformer was annealed in air at a temperature of between approximately 300 and 350C for one hour. It was subsequently cooled, in a controlled fashion, with a cooling speed of approximately 100 through 250C per hour, and was then allowed to cool further below 200C in an uncontrolled manner. A thin oxide layer sufficient for the insulation of the individual windings relative to one another is also formed during this annealing process on the tape consisting of the amorphous alloy, which reduces the eddy current probl~m. Additionally, a synthetic material film can be applied onto the high permeability winding after the annealing process as an additional protection.
For the transformer described, the aluminum has a weight of 138 g and the tape of the amorphous alloy has a weight of 69 g, Accordingly, the weight of the magnetic material is much lower than that of the conductor material~
From Figure 3 it is apparent that with an increasing ratio of the exterior relative to the interior diameter of the electrically conductive winding in the components, according to the invention, the more expensive high permeability material can be reduced because of the increased amount of cheaper conductor material.
The ratio of mass or weight m to output P in g/W are plotted in Figure 3 on the ordinate and the ratio of exterior diameter d2 to interior diameter dl is plotted on the abscissa. The plotted curves 11, 12, 13 are valid for the inventive components. For this graph, the electrically conduc-.
, tive winding consists of aluminum and has a square cross section and a space factor of 0.85 and the high permeability winding of amorphous material is designed in a toroid-shaped, has a space factor of 0.2, and fills one-half of the diameter dl of the winding hole of the electrically conductive winding.
For the magnetic material iron losses of 28 W/kg are assumed, at an induction of 0.2 T and a frequency of 20 kH~. The operating temperature is 60C with an overtemperature of 60 K .
Curve 11 illustrates the mass of the high permeability material, curve 12 illustrates the mass of the electrically conductive material and curve 13 illustrates the total mass in reference to the output respectively.
As can be readily seen in a comparison of curves 11 and 12, the mass of the -~ necessary magnetic material is smaller with diameter ratios d2/dl above approximately 1.9 than the mass of the required conductor material relative to the output obtained.
Curves 14, 15 and 16 are comparison curves, shown in broken line, relating to conventional components. It is thereby assumed, that the high permeability winding is a ring-shaped tape core corresponding to the electric-ally conductive winding of the inventive components with regard to the geo-metric shape and the space factor. Additionally, the electrically conductive winding consists of copper wire and corresponds in geometric shape and space factor to the high permeability winding of the inventive component. Curve 14 illustrates the mass of the high permeability material, curve 15 shows the mass of the conductor material, and curve 16 shows the total mass relative to the cutput respectively in dependency upon the ratio of the exterior diameter d2 relative to the interior dl of the ring-shaped tape core. A'comparison of curves 14 and 15 shows that in conventional components the mass of the magnetic material relative to the output increases while the mass of the con-ductor material relative to the output decreases. Moreover, a comparison .
.
of curves 13 and 16 shows that with a given diameter ratio, the mass per out-put is considerably greater in conventional components than in the inventive components.
Curves 13 and 16 are once more shown in Figure 4. ~dditionally, Figure 4 contains two other curves oE which curve 17 represents the volume V
of the inventive component and curve 18 represents the volume V oE the con-ventional component relative to output P respectively versus the diameter ratio d2/dl. The assumed properties of the components are the same as in Figure 3. Curve 17 and 18 show that with a given diameter ratio the volume per output is somewhat larger in the inventive components than in conventional components. However, in relationship to the considerable saving possibilities of high permeability material, as is apparent from Figure 3 because of greater use of the cheaper conductor material in the inventive components, this is not of great importance~ From Figure 4 it is also obvious that with diameter ratios between approximately 1.4 and above 3 through approximately 3.5, the mass as well as the volume relative to the output are particularly low in the inventive components. Particularly advantageous diameter ratios exist between approximately 1.5 and 2.5, and in addition, with an increasing diameter ratio, the previously mentioned advantage of saving high permeability material also exists.
Thus far, only components have been described in the sample embodi-ments wherein the electrically conductive windings exhibit the particularly advantageous square cross section. However, the invent;on is not limited thereto, the electrically conductive windings can also have other cross sectional forms. For example, the cross section can also be rectangular.
However, as has been previously mentioned, the ratio between the side parallel to the winding axis and the side at right angle relative to the winding axis should lie between 2.5:1 and 1:1.
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Furthermore, particularly with components having several electric-ally conductive windings, the electrically conductive winding can consist of parts of different heights. One sample embodiment therefore is schematically illustrated in Figure 5. The electrically winding consists of a primary wind-ing 21 and two secondary windings 22 and 23 which, for example, consist of an aluminum tape whose height decreases from the exterior towards the interior.
Due to decreasing the height of the individual partial windings towards the interior, more room is left for the winding 24 consisting of a tape of a high permeability, amorphous alloy in the winding hole so that the outlines of the cross section of the high permeability winding 24 more closely approximate a rounded-off rectangle than in the component according to Figure 3.
While we have disclosed an exemplary structure to illustrate the : principles of the invention, it should be understood that we wish to embody , within the scope of the patent warranted hereon all such modifications as reason~bly ~nd properly come withln the scope oi o~r contri~utlon to the ~rt.
`~' :~:
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the composition M Xl , wherein: M represents at least one of the metals iron, cobalt, and nic~el; X represents at least one of the so-called glass-forming elements boron, carbon, silicon, and phosphorous; and y lies between approximately 0.60 and 0.95. In addition to the above-mentioned metals M, the amorphous alloys can also contain additional metals, in particular titanium, zircon, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, palladium, platinum, copper, silver, or gold. In addi-tion to the glass-forming elements X or, if necessary, even in place of them, the elements aluminum, gallium, indium, germanium, tin, arsenic, antimony, bismuth or beryllium can be present, (compare, for example, German OS
2,546,676; 2,553,003; 2,605,615; 2,628,362; and 2,708,151).
For high permeability amorphous alloys, it generally holds true that with regard to their magnetic properties they are less sensitive to deformations for example, those occurring upon the winding of the tape onto an electrically conductive winding, than those tapes consisting of crystalline high permeability alloys, with regard to their magnetic properties.
A number of cobalt-containing, amorphous alloys, specifically, as they are disclosed in German OS 2,546,676 and 2,708,151, have a magneto-striction which is close to zero. These alloys can advantageously have the composition of CoaFebNicSidBePfCgAlh~ wherein 0.3 ~- a ~ 0.8, 0 ~ b C 0.1, o C c ~ 0.4, 0 ~ d ~ 0.3, 0 ~ e C 0.3, 0 ~ f ~ 0.25, 0 C g C 0.15, 0 C h ~ 0.1, and in addition, a + b + c + d + e + f + g + h = 1, 0.6 ' a + b + c, and ; 0.1 ~ d + e + f -~ g + h.
The magnetic properties of these alloys are very insensitive to deformations.
':
Tapes of such alloys can therefore be wound onto electrically conductive wind-ings after a preceeding heat-treatment or, if necessary, completely without such heat-treatment. Other high permeability, amorphous alloys, in particular such of the composition Fe ~ibMe PdB sifc Alh, wherein Me represents one or more of the metals cobalt, chromium, molybdenum, titanium, vanadium, copper, and ; 0.1 ' a C 0.9, ~ O ~ b ~ 0.6, - O ~ c ~ 0.4, O C d ~ 0.25, O C e C 0.3, O ~ f C 0.3, O c g ~ 0.15, and O ~ h ~ 0.1;
and also a + b + c + d + e + f + g + h = 1, 0.6 C a + b + c, and 0.1 ~ d + e + f + g + h, have a perceptible magneto-striction. However, they respond to a relaxation - annealing process at the relatively low temperatures of approximately 150 through 400C. The magnetic hysteresis losses for high frequencies, (for example 20 kHz), are relatively low in these alloys after the heat-treatment.
Thus, when using such alloys, the component can be subjected to a heat-treat-ment of between 150 and 400 C after the winding of the amorphous high permeability tape onto the prefabricated, electrically conductive winding, which has been provided with an insulation. Of course thi.s is true only as long as the remaining materials used for the component are stable at these temperatures.
It is particularly advantageous to design the electrically conductive winding in a ring-shape and to wind the tape of the amorphous alloy in such a toroidal shape that it largely surrounds or encases the electrically conductive winding, preferably as much as possible. Particularly suited therefor are amorphous tapes of not too wide a width, for example, of a width of 2 mm through to 5 mm as they are readily produced directly from the melt. These tapes can then be mounted onto the prefabricated, electrically conductive wind-ing in one or several layers in a similar fashion to the one used in con-ventional inductive components wound onto a prefabricated ring-shaped tape core. Additionally, the structure has the advantage that the high permeability, amorphous tape wound in toro-dal shape has a simultaneous magnetic screening effect as a shell core.
The electrically conductive winding can advantageously be produced of aluminum, whereby, in relation to copper, a considerable saving in weight results. Moreover, the individual windings can readily be insulated from one another in a manner unaffected by temperature changes, by means of an anodiz-ing layer at their surface. For larger components, foils or films of a synthetic material with the required temperature stability can also be utilized for insulation.
If the weight savings is not a decisive factor, copper can naturally be used for the electrically conductive winding. Insulation may then be accomplished by the use of a lacquer or a glass fiber casing, which is unaffected by temperature changes.
B~
The electrically conductive wlnding can be advantageously produced out of a tape material, preferably an aluminum tape, which can be wound similarly to the ring-shaped tape cores in a conventional component. With such tape winding a particularly high space Eactor, and thus a particularly compact design, can be obtained. The winding can also comprise several partial windings electrically separated from one another, for example, the primary and secondary winding of a transformer or transmittrr.
In order to obtain a high output with the smallest possible material use, it is particularly advantageous to select an approximately square cross section for the electrically conductive, ring-shaped winding which is to be provided with a toroidal-shaped winding of high permeability tape. An approximately rectangular cross section with a ratio of the side parallel to the winding axis relative to the side at right angle to the winding axis of approximately 2.5:1 through 1:1 is appropriate. It is also expedient to make the winding packet of high permeability tape so thick that half the diameter of the winding hole of the electrically conductive winding is filled by high permeability material. Additionally, the space factors of the two windings should be selected as great as possible if the smallest possible design volume is to be obtained with a prescribed maximum output of the component. Indeed, the maximum Otltput relative to volume unit increases with an increasing space factor. For a winding consisting of aluminum tape, space factors through to 0.9 can be obtained, and in the high permeability toroidal-shaped winding, space factors through 0.3 can be obtained. In order to simultaneously obtain the highest possible maximum output relative to weight it is also advantageous to select the ratio of exterior diameter relative to interior diameter of the electrically conductive winding of approximately between 1.3 and 3.5, most advantageously between 1.5 and 2.5.
In comparison to conventional components, more expensive high permeability material can therby ke saved in place of less expensive conductor material. Indeed, under the previously stated criteria for the geometric design of the component, the amount of high permeability material necessary for output unit decreases with an increasing ratio between the exterior and the interior diameter of the electrically conductive winding in the components, as the amount of conductor material increases. In conventional camponents, e.g. in a ring-shaped tape core provided with a toroidal-shaped electrically conductive winding, this relationship is reversed.
In accordance with this invention, there is provided an inductive com-ponent having an electrically conductive winding with a tape of high perme-ability magnetic ma~erial wound on said electrically conductive winding, charac-terized in that (a) the tape of high magnetic permeability consists of an amor-phous alloy, and (b) the electrically conductive winding is a ring-shaped elec-trically conductive winding having an appro~imately rectangular cross-section with a ratio of the side parallel to the winding axis relative to the side at a right angle to the winding axis, in the range of approximately 2.5:1 through l:l.
In accordance with another aspect of this invention, there is provided a method for producing an inductive component ~hich comprises: forming a winding of an electrically conductive material; insulating said electrically conductive winding; forming a winding of high magnetically permeable material about the electrically conductive winding; and heating the component thus formed to a te~,perature of between 150 and 400 & in order to mechanically relax the magnet-ically permeable material.
The invention is to be more precisely explained with the aid of several Figures and examples. Various other objects, advantages, and features of the present invention will became 2~
readily apparent from the ensuing detailed description and the novel features will be particularly pointed out in the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
_ _ _ . _ Figure 1 is a perspective view of a preferred embodiment.
Figure 2 is a schematic sectional view taken along line II-II in Figure 1.
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~`' - 7a -33-~
~ ~8~Z~
Figure 3 which is located on the second page of drawings is a graph showing the relationship between the ratio of mass relative to output and the ratio of the exterior diameter relative to the interior diameter, for a com-ponent according to Figures 1 and 2, with comparison curves for a conventional component addecl.
Figure 4 is a graph similar to Figure 3 but showing in addition the relationship between the ratio of volume to output and the ratio of exterior diameter relative to the interior diameter, for a component according to Figures 1 and 2, with comparison curves for a conventional component added.
Figure 5 is a view similar to Figure 2 showing an alternate embodi-ment of this invention.
DESCRIPTIO~ OF THE PREFERRED EMBODIMENTS
. .
A transformer according to this invention is more precisely explain-ed with the aid of Figures 1 and 2 in the following sample embodiment. The ring-shaped electrically conductive winding of this transformer is subdivided into two partial windings, a primary and a secondary winding and has a square cross section and is toroidally surrounded by a winding of high permeability, amorphous tape.
The transformer is designed for a primary voltage of 300 V, a secondary voltage of 48 V and a transmittable output of 670 W at a frequency of 20 kH~. The ambient tempPrature is to be 60C, the permissible overtemper-ature is 60 K The magnetic losses of the high permeability winding amount to 28 W/kg.
Proceeding Lrom the operating conditions, the following geometric data were determined for the transformer: , Interior diameter of the transformer d = 1.4 cm Exterior diameter of the transformer d = 7.9 cm Height of the transformer h = 3.4 cm ~ --~8'~:~9 Interior diameter of the electricallydl= 2.8 cm conductive winding Exterior diameter of the electricallyd2= 6.8 cm conductive winding Height of the electrically conductive winding h2= 2.0 cm Magnetic iron cross section 0.9 cm2 Effective conductor cross section 3.4 cm Average iron path length 15.1 cm Average electric winding length 9.8 cm.
The transformer was constrùcted with a primary winding 1 having 122 windings of 0.08 mm thick and 18 mm wide aluminum tape and a secondary winding 2 with 20 windings of 0.45 mm thick and 18 mm wide aluminum tape. A
` 19 mm wide and 0.2 mm thick polyimide film was placed between the windings as insulation which, for the sake of clarity, was not separately illustrated in Figure 2. The space factor of the winding consisting of the two partial windings 1 and 2 and having a square cross section is approximately 0.85. The ratio of exterior diameter d2 relative to interior diameter dl of the winding is 2.4.
A polyimide film 3 is again used as cover insulation of the electrically conductive windings 1, 2 said film may be applied on the winding by the use of heat shrinkable plastic.
Around the winding 1, 2 thus insulated, 900 windings 4 consisting of 2 mm wide and 0.05 mm thick tape of high permeability, amorphous alloy FeO 40Nio 40P0 14Bo 06 were then wound around in such a manner that they surrounded the electrically conductive winding 1, 2 in a toroidal shape.
Only the point at which the electric connections 5 are guided out of primary winding 1 and secondary winding 2, is not covered by the high permeability winding. The free end of the amorphous tape can simply be pushed underneath an adjacent winding in order to maintain the high permeability winding in _9_ - - . . ~ . .,: . ~
2~
place. The high permeability winding, whose space factor i9 approximately O.Z, fills approximately one-half of the diameter dl, (which is the winding hole of the electrically conductive winding).
To achieve mechanical relaxation and to improve the dynamic proper-ties, particularly to decrease the magnetic losses of the high permeability winding, the completely wound transformer was annealed in air at a temperature of between approximately 300 and 350C for one hour. It was subsequently cooled, in a controlled fashion, with a cooling speed of approximately 100 through 250C per hour, and was then allowed to cool further below 200C in an uncontrolled manner. A thin oxide layer sufficient for the insulation of the individual windings relative to one another is also formed during this annealing process on the tape consisting of the amorphous alloy, which reduces the eddy current probl~m. Additionally, a synthetic material film can be applied onto the high permeability winding after the annealing process as an additional protection.
For the transformer described, the aluminum has a weight of 138 g and the tape of the amorphous alloy has a weight of 69 g, Accordingly, the weight of the magnetic material is much lower than that of the conductor material~
From Figure 3 it is apparent that with an increasing ratio of the exterior relative to the interior diameter of the electrically conductive winding in the components, according to the invention, the more expensive high permeability material can be reduced because of the increased amount of cheaper conductor material.
The ratio of mass or weight m to output P in g/W are plotted in Figure 3 on the ordinate and the ratio of exterior diameter d2 to interior diameter dl is plotted on the abscissa. The plotted curves 11, 12, 13 are valid for the inventive components. For this graph, the electrically conduc-.
, tive winding consists of aluminum and has a square cross section and a space factor of 0.85 and the high permeability winding of amorphous material is designed in a toroid-shaped, has a space factor of 0.2, and fills one-half of the diameter dl of the winding hole of the electrically conductive winding.
For the magnetic material iron losses of 28 W/kg are assumed, at an induction of 0.2 T and a frequency of 20 kH~. The operating temperature is 60C with an overtemperature of 60 K .
Curve 11 illustrates the mass of the high permeability material, curve 12 illustrates the mass of the electrically conductive material and curve 13 illustrates the total mass in reference to the output respectively.
As can be readily seen in a comparison of curves 11 and 12, the mass of the -~ necessary magnetic material is smaller with diameter ratios d2/dl above approximately 1.9 than the mass of the required conductor material relative to the output obtained.
Curves 14, 15 and 16 are comparison curves, shown in broken line, relating to conventional components. It is thereby assumed, that the high permeability winding is a ring-shaped tape core corresponding to the electric-ally conductive winding of the inventive components with regard to the geo-metric shape and the space factor. Additionally, the electrically conductive winding consists of copper wire and corresponds in geometric shape and space factor to the high permeability winding of the inventive component. Curve 14 illustrates the mass of the high permeability material, curve 15 shows the mass of the conductor material, and curve 16 shows the total mass relative to the cutput respectively in dependency upon the ratio of the exterior diameter d2 relative to the interior dl of the ring-shaped tape core. A'comparison of curves 14 and 15 shows that in conventional components the mass of the magnetic material relative to the output increases while the mass of the con-ductor material relative to the output decreases. Moreover, a comparison .
.
of curves 13 and 16 shows that with a given diameter ratio, the mass per out-put is considerably greater in conventional components than in the inventive components.
Curves 13 and 16 are once more shown in Figure 4. ~dditionally, Figure 4 contains two other curves oE which curve 17 represents the volume V
of the inventive component and curve 18 represents the volume V oE the con-ventional component relative to output P respectively versus the diameter ratio d2/dl. The assumed properties of the components are the same as in Figure 3. Curve 17 and 18 show that with a given diameter ratio the volume per output is somewhat larger in the inventive components than in conventional components. However, in relationship to the considerable saving possibilities of high permeability material, as is apparent from Figure 3 because of greater use of the cheaper conductor material in the inventive components, this is not of great importance~ From Figure 4 it is also obvious that with diameter ratios between approximately 1.4 and above 3 through approximately 3.5, the mass as well as the volume relative to the output are particularly low in the inventive components. Particularly advantageous diameter ratios exist between approximately 1.5 and 2.5, and in addition, with an increasing diameter ratio, the previously mentioned advantage of saving high permeability material also exists.
Thus far, only components have been described in the sample embodi-ments wherein the electrically conductive windings exhibit the particularly advantageous square cross section. However, the invent;on is not limited thereto, the electrically conductive windings can also have other cross sectional forms. For example, the cross section can also be rectangular.
However, as has been previously mentioned, the ratio between the side parallel to the winding axis and the side at right angle relative to the winding axis should lie between 2.5:1 and 1:1.
' ' '' ' ~
Furthermore, particularly with components having several electric-ally conductive windings, the electrically conductive winding can consist of parts of different heights. One sample embodiment therefore is schematically illustrated in Figure 5. The electrically winding consists of a primary wind-ing 21 and two secondary windings 22 and 23 which, for example, consist of an aluminum tape whose height decreases from the exterior towards the interior.
Due to decreasing the height of the individual partial windings towards the interior, more room is left for the winding 24 consisting of a tape of a high permeability, amorphous alloy in the winding hole so that the outlines of the cross section of the high permeability winding 24 more closely approximate a rounded-off rectangle than in the component according to Figure 3.
While we have disclosed an exemplary structure to illustrate the : principles of the invention, it should be understood that we wish to embody , within the scope of the patent warranted hereon all such modifications as reason~bly ~nd properly come withln the scope oi o~r contri~utlon to the ~rt.
`~' :~:
Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An inductive component having an electrically conductive winding with a tape of high permeability magnetic material wound on said electrically conduc-tive winding, characterized in that (a) the tape of high magnetic permeability consists of an amorphous alloy, and (b) the electrically conductive winding is a ring-shaped electrically conductive winding having an approximately rectangular cross-section with a ratio of the side parallel to the winding axis relative to the side at a right angle to the winding axis, in the range of approximately 2.5:1 through 1:1.
2. In an inductive component as described in claim 1 wherein said amor-phous alloy has the composition of CoaFebNicSidBePfCgAlh, wherein:
0.3 ? a ? 0.8, 0 ? b ? 0.1, 0 ? c ? 0.4, 0 ? d ? 0.3, 0 ? e ? 0.3, 0 ? f ? 0.25, 0 ? g ? 0.15, 0 ? h ? 0.1, and also a + b + c + d + e + f + g + h = 1, 0.6 ? a + b + c, and 0.1 ? d + e + f + g + h.
0.3 ? a ? 0.8, 0 ? b ? 0.1, 0 ? c ? 0.4, 0 ? d ? 0.3, 0 ? e ? 0.3, 0 ? f ? 0.25, 0 ? g ? 0.15, 0 ? h ? 0.1, and also a + b + c + d + e + f + g + h = 1, 0.6 ? a + b + c, and 0.1 ? d + e + f + g + h.
3. In an inductive component as described in claim 1 wherein said amorphous alloy has the composition of FeaNibNecPdBeSifCgAlh, wherein Me represents one or more of the following metals: cobalt, chromium, molybdenum, titanium, vanadium, copper, and 0.1 ? a ? 0.9, 0 ? b ? 0.6, 0 ? c ? 0.4, 0 ? d ? 0.25, 0 ? 3 ? 0.3, 0 ? f ? 0.3, 0 ? g ? 0.15, 0 ? h ? 0.1, and also a + b + c + d + e + f + g + h = 1, 0.6 ? a + b + c, and 0.1 ? d + e + f + g + h.
4. In an inductive component as described in claim 1 wherein:
all parts and materials used in the manufacture of said inductive component are stable at temperatures of between 150 and 400°C.
all parts and materials used in the manufacture of said inductive component are stable at temperatures of between 150 and 400°C.
5. In an inductive component as described in claim 1 wherein said electrically conductive winding consists of aluminum.
6. In an inductive component as described in claim 1 wherein said electrically conductive winding is wound of tape-form material.
7. In an inductive component as described in claim 1 wherein said electrically conductive ring-shaped winding has an approximately square cross section.
8. In an inductive component as described in claim 1 wherein said high magnetically permeable tape occupies about one-half of the diameter of said winding hole.
9. In an inductive component as described in claim 7 wherein the exterior diameter relative to the interior diameter of the electrically conductive winding establishes a ratio of between 1.3 and 3.5, inclusive.
10. In an inductive component as described in claim 9 wherein said exterior to interior diameter ratio is between 1.5 and 2.5, inclusive.
11. A method for producing an inductive component which comprises:
forming a winding of an electrically conductive material; insulating said electrically conductive winding; forming a winding of high magnetically permeable material about the electrically conductive winding; and heating the component thus formed to a temperature of between 150 and 400°C in order to mechanically relax the magnetically permeable material.
forming a winding of an electrically conductive material; insulating said electrically conductive winding; forming a winding of high magnetically permeable material about the electrically conductive winding; and heating the component thus formed to a temperature of between 150 and 400°C in order to mechanically relax the magnetically permeable material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782824749 DE2824749A1 (en) | 1978-06-06 | 1978-06-06 | INDUCTIVE COMPONENT AND PROCESS FOR ITS MANUFACTURING |
| DEP2824749.6 | 1978-06-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1148229A true CA1148229A (en) | 1983-06-14 |
Family
ID=6041152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000329091A Expired CA1148229A (en) | 1978-06-06 | 1979-06-05 | Inductive component and method for its production |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0005836B1 (en) |
| JP (1) | JPS553695A (en) |
| CA (1) | CA1148229A (en) |
| DE (2) | DE2824749A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10283265B2 (en) * | 2014-09-26 | 2019-05-07 | Hitachi Metals, Ltd. | Method of manufacturing amorphous alloy magnetic core |
| US11244782B2 (en) | 2014-09-26 | 2022-02-08 | Hitachi Metals, Ltd. | Amorphous alloy magnetic core |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55161057A (en) * | 1979-06-04 | 1980-12-15 | Sony Corp | Manufacture of high permeability amorphous alloy |
| JPS5841649B2 (en) * | 1980-04-30 | 1983-09-13 | 株式会社東芝 | wound iron core |
| JPS5831053A (en) * | 1981-08-18 | 1983-02-23 | Toshiba Corp | Amorphous alloy |
| EP0160166A1 (en) * | 1981-11-26 | 1985-11-06 | Allied Corporation | Low magnetostriction amorphous metal alloys |
| EP0080521B1 (en) * | 1981-11-26 | 1986-10-15 | Allied Corporation | Low magnetostriction amorphous metal alloys |
| JPS58139408A (en) * | 1982-02-15 | 1983-08-18 | Hitachi Metals Ltd | Wound iron core |
| JPH0611007B2 (en) * | 1982-10-05 | 1994-02-09 | ティーディーケイ株式会社 | Magnetic core for magnetic switch |
| JPS59150414A (en) * | 1982-12-23 | 1984-08-28 | Toshiba Corp | Reactor for semiconductor circuit |
| DE3424958A1 (en) * | 1983-07-06 | 1985-01-17 | Mitsubishi Denki K.K., Tokio/Tokyo | WIRE ELECTRODE FOR ELECTRICAL DISCHARGE PROCESSING BY MEANS OF CUTTING WIRE |
| JPS6029234A (en) * | 1983-07-11 | 1985-02-14 | Mitsubishi Electric Corp | Wire electrode for wire cut electrical discharge machining |
| JPS61288048A (en) * | 1985-06-13 | 1986-12-18 | Hitachi Metals Ltd | Fe-base amorphous alloy with low core loss |
| JPH07117511B2 (en) * | 1987-02-04 | 1995-12-18 | 株式会社神戸製鋼所 | Method of measuring bacterial cell amount |
| US4958134A (en) * | 1987-09-04 | 1990-09-18 | Kabushiki Kaisha Toshiba | Noise suppression device comprising a toroid winding |
| DE3733376A1 (en) * | 1987-10-02 | 1989-04-13 | Vacuumschmelze Gmbh | Method for producing a coaxially field-coupled transformer |
| JPH061733B2 (en) * | 1989-06-15 | 1994-01-05 | 株式会社東芝 | Reactor for switching circuit |
| EP0720277B1 (en) * | 1992-09-24 | 2000-03-15 | Kabushiki Kaisha Toshiba | Snubber circuit, switching power-supply, and saturable inductor used for them |
| WO1998029882A1 (en) * | 1996-12-30 | 1998-07-09 | Wilhelm Seibel | Focusing of the fields of lines of magnetic force of permanent magnets and alignment of the magnetic flow |
| DE59907740D1 (en) | 1998-09-17 | 2003-12-18 | Vacuumschmelze Gmbh | CURRENT TRANSFORMER WITH DC CURRENT TOLERANCE |
| JP2002530853A (en) | 1998-11-13 | 2002-09-17 | バクームシユメルツエ、ゲゼルシヤフト、ミツト、ベシユレンクテル、ハフツング | Magnetic core suitable for use in current transformer, method of manufacturing the same, and current transformer |
| DE10062091C1 (en) * | 2000-12-13 | 2002-07-11 | Urs Graubner | Inductive component for power or communications applications has 2 complementary shell cores with ferromagnetic wire sections in ring around core axis |
| CN101509106B (en) * | 2008-02-20 | 2010-06-30 | 吴更生 | Fe-based amorphous alloy material and method of producing the same |
| DE102009043539A1 (en) * | 2009-09-30 | 2011-04-21 | Vacuumschmelze Gmbh & Co. Kg | Magnetic strip, sensor comprising a magnetic strip and method of making a magnetic strip |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE915588C (en) * | 1940-02-20 | 1954-07-26 | Aeg | Process for the production of winding cores for transformers, converters or the like. |
| US4053331A (en) * | 1974-09-20 | 1977-10-11 | University Of Pennsylvania | Method of making amorphous metallic alloys having enhanced magnetic properties by using tensile stress |
| SE7511398L (en) * | 1974-10-21 | 1976-04-22 | Western Electric Co | MAGNETIC DEVICE |
| NL182182C (en) * | 1974-11-29 | 1988-01-18 | Allied Chem | DEVICE WITH AMORPHIC METAL ALLOY. |
| US4056411A (en) * | 1976-05-14 | 1977-11-01 | Ho Sou Chen | Method of making magnetic devices including amorphous alloys |
| US4038073A (en) * | 1976-03-01 | 1977-07-26 | Allied Chemical Corporation | Near-zero magnetostrictive glassy metal alloys with high saturation induction |
| NL176090C (en) * | 1977-02-26 | 1985-02-18 | Vacuumschmelze Gmbh | METHOD FOR REDUCING THE MAGNETICIZATION LOSSES IN THIN-WEEK-MAGNETIC AMORPHIC METAL ALLOYS. |
| JPS5434051A (en) * | 1977-08-19 | 1979-03-13 | Matsushita Electric Ind Co Ltd | Method of making magnetic circuit |
-
1978
- 1978-06-06 DE DE19782824749 patent/DE2824749A1/en not_active Withdrawn
-
1979
- 1979-05-31 DE DE7979101673T patent/DE2962787D1/en not_active Expired
- 1979-05-31 EP EP79101673A patent/EP0005836B1/en not_active Expired
- 1979-06-05 CA CA000329091A patent/CA1148229A/en not_active Expired
- 1979-06-06 JP JP7108479A patent/JPS553695A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10283265B2 (en) * | 2014-09-26 | 2019-05-07 | Hitachi Metals, Ltd. | Method of manufacturing amorphous alloy magnetic core |
| US11244782B2 (en) | 2014-09-26 | 2022-02-08 | Hitachi Metals, Ltd. | Amorphous alloy magnetic core |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2962787D1 (en) | 1982-07-01 |
| DE2824749A1 (en) | 1979-12-13 |
| EP0005836A2 (en) | 1979-12-12 |
| EP0005836B1 (en) | 1982-05-12 |
| JPS553695A (en) | 1980-01-11 |
| EP0005836A3 (en) | 1980-01-09 |
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