US1871317A - Magnetic core and method of making the same - Google Patents
Magnetic core and method of making the same Download PDFInfo
- Publication number
- US1871317A US1871317A US480880A US48088030A US1871317A US 1871317 A US1871317 A US 1871317A US 480880 A US480880 A US 480880A US 48088030 A US48088030 A US 48088030A US 1871317 A US1871317 A US 1871317A
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- US
- United States
- Prior art keywords
- cores
- making
- magnetic
- pressure
- same
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Links
- 238000004519 manufacturing process Methods 0.000 title description 3
- 239000002245 particle Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910000889 permalloy Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
- H01F1/14708—Fe-Ni based alloys
- H01F1/14733—Fe-Ni based alloys in the form of particles
- H01F1/14741—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together
Definitions
- This .invention relates to'magnetic cores andrmethods of making the same, and more to J. W. Andrews et al., wherein iinely divided particles of a magnetic material such as an alloy of nickeland iron are Coated with au insulating material, and are then compressed into cores ofthe desired shape and size, which are heat treated to impart the desired electrical and magnetic properties thereto.
- a magnetic material such as an alloy of nickeland iron
- Objects of the invention are to provide cores having improved magnetic characteristics and lower hysteresis losses, and to provide an improved method of making such cores.
- a pressure materially higher than those heretofore used is employed in compressing the material into cores, and the cores are then subjected to an annealing treatment tobring 'about the optimum of'mechanical, electrical, and magnetic properties in the tinished cores.
- Fig. 1 is a graphical illustration showing the relation between the forming pressure and the hysteresis loss inmagnetic cores
- lF i 2 is a similar illustration showing the relation between the forming pressure and the permeability in magnetic cores
- Fig. 3 is a perspective view of a section of a. loading coil core made in accordance with the present invention.-
- the magnetic material employed is preferably prepared from a nickel-iron alloy known as permalloy, a ratio of 81 parts'nickel to 19 parts iron being satisfactory for most purposes.
- the alloy is treated in the manner disclosed in Patent 1,669,649, issued May 15, 1928 to C. P. Beath et al. toreduce it to a finely divided form, the particles being preferably of such neness that they will pass a 120-mesh screen or finer.
- the alloy particles are then annealed in the known manner, after which they are coated with an insulating material which insulates the particles from each other .and which may be of the composition described in the J. W. Andrews et al, patents referred to above. pressed into cores or rings under sufficient pressure to create an autogenous bond between the insulated particles of metal which holds them together in rigid relation to each other.
- a m/ethod of forming magnetic cores from particles of a nickel-iron alloy which consists in coating said particles with an insulating composition, compressing the insulated particles into a core under a pressure of y at least 250,000 pounds per square inch, and
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
Description
Aug. 9, 1932.
MAGNETIC CORE ANI'j METHD oF MAKING THE sAME` Filed sept. 1o, 1930 I l I I A l .0,000 /00,000 /54000 200,0@ 250,0W 300,000
fname/mr i yPatented 'Augu 9, 1932 AUNITED STATES PATENT owl-FICE i RANDALL GILLIS, OF LAXGBANGE, ILLINOIS, ASSIGNOR TO WESTERN ELECTRIC COM- YPANY, INCORPORATED,'OF NEW YORK, N. Y., A CORPORATION OF NEW YORK MAGNETIC CORE AND METHOD OF MAKING THE'SAME Application led September 10, 1930. Serial No. 480,880.
This .invention relates to'magnetic cores andrmethods of making the same, and more to J. W. Andrews et al., wherein iinely divided particles of a magnetic material such as an alloy of nickeland iron are Coated with au insulating material, and are then compressed into cores ofthe desired shape and size, which are heat treated to impart the desired electrical and magnetic properties thereto.-
Objects of the invention are to provide cores having improved magnetic characteristics and lower hysteresis losses, and to provide an improved method of making such cores.
In accordance with one embodiment of the invention, a pressure materially higher than those heretofore used is employed in compressing the material into cores, and the cores are then subjected to an annealing treatment tobring 'about the optimum of'mechanical, electrical, and magnetic properties in the tinished cores.
The invention will be'clearly understood from the following detailed desoriptionof one embodiment thereof, taken in connection with the accompanying drawing, in which Fig. 1 is a graphical illustration showing the relation between the forming pressure and the hysteresis loss inmagnetic cores; lF i 2 is a similar illustration showing the relation between the forming pressure and the permeability in magnetic cores, and
Fig. 3 is a perspective view of a section of a. loading coil core made in accordance with the present invention.-
In carrying out the present invention the magnetic material employed is preferably prepared from a nickel-iron alloy known as permalloy, a ratio of 81 parts'nickel to 19 parts iron being satisfactory for most purposes. The alloy is treated in the manner disclosed in Patent 1,669,649, issued May 15, 1928 to C. P. Beath et al. toreduce it to a finely divided form, the particles being preferably of such neness that they will pass a 120-mesh screen or finer. The alloy particles are then annealed in the known manner, after which they are coated with an insulating material which insulates the particles from each other .and which may be of the composition described in the J. W. Andrews et al, patents referred to above. pressed into cores or rings under sufficient pressure to create an autogenous bond between the insulated particles of metal which holds them together in rigid relation to each other. v
`In forming the mass into cores, it has been found that a pressure substantially in excess of 200,000 pounds per squareinch is dcsirable in that the hy'fsteresis loss in cores The mass is then dried and,
formed at such higher pressures is reduced.
This may be seen from an examination of Fig. l1, wherein the abscissze represent forming pressures inpounds per square inch and the ordinates represent hysteresis loss in watts per cycle per cm3 1010. From the values shown iii-Fig. land from further experiments it has been determined that -a forming pressure of about 250,000 pounds per square inch or. higher is'especially suitable. hysteresis loss of permalloy and other magnetic metals was thought to be increased by cold working but as evidenced by the curve in Fig. l a lower hysteresis loss is obtained by using higher forming pressures. It is believed that the decrease in hysteresis loss with increased forming pressure is due to the magnetic flux being more uniformly distributed throughout the cross-section of the core beity of the cores increases with increased form,- 10
The
y absclss represent forming pressure and the' 7cycle per cmsXlOl".
ing pressure, as shown inFig. 2, wherein the ordinates represent permeability in watts per It will e seen from an, examination of Fig. 2 that the permeability increases slowly but yet appreciably as the forming pressure is increased above 200,000 ounds per square inch. In other words, t e roperty of permeability is not adversely a ected by the higher pressures, but
on the contrary tends to slightly higher values.
-After the cores have been compressed as above described, they may be annealed in the,
known manner to impart the desired electrical and mechanical properties thereto, after which they are ready to receive the usual toroidal winding preparatory to being placed in a telephone system.
While the invention has been described in connection with a composition having certain specified ingredients, it is applicable tog differently constituted compositions, and the details hereinabove set forth may be considerably varied without departing from the scope of the invention.
What is claimed is:
' 1. A mafrnetic core composed of insulated articles o? a nickel-iron alloy held together y anautogenous bond formed under a pressure of about 250,000 pounds per square inch.
2. A. method of forming magnetic cores from insulated particles of a nickel-iron alloy, which consists in compressing the particles into the desired form under a pressure of about 250,000 pounds per square inch.
3. A m/ethod of forming magnetic cores from particles of a nickel-iron alloy, which consists in coating said particles with an insulating composition, compressing the insulated particles into a core under a pressure of y at least 250,000 pounds per square inch, and
annealing the formed cores. In witness whereof, I hereunto subscribe my name this 29th day of August A. D.,
RANDALL GILLIS.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US480880A US1871317A (en) | 1930-09-10 | 1930-09-10 | Magnetic core and method of making the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US480880A US1871317A (en) | 1930-09-10 | 1930-09-10 | Magnetic core and method of making the same |
Publications (1)
Publication Number | Publication Date |
---|---|
US1871317A true US1871317A (en) | 1932-08-09 |
Family
ID=23909723
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US480880A Expired - Lifetime US1871317A (en) | 1930-09-10 | 1930-09-10 | Magnetic core and method of making the same |
Country Status (1)
Country | Link |
---|---|
US (1) | US1871317A (en) |
-
1930
- 1930-09-10 US US480880A patent/US1871317A/en not_active Expired - Lifetime
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