US1857215A - Electrical induction apparatus - Google Patents
Electrical induction apparatus Download PDFInfo
- Publication number
- US1857215A US1857215A US433484A US43348430A US1857215A US 1857215 A US1857215 A US 1857215A US 433484 A US433484 A US 433484A US 43348430 A US43348430 A US 43348430A US 1857215 A US1857215 A US 1857215A
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- US
- United States
- Prior art keywords
- core
- layers
- magnetic
- assembled
- annealed
- 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 - Lifetime
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- 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
- H01F1/16—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 in the form of sheets
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- 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
- Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling
-
- 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
- Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
- Y10T29/49078—Laminated
Definitions
- My invention relates to electrical induction apparatus and more particularly to an improved method for producing magnetic cores for such apparatus.
- a magnetic core must be properly annealed to reduce hysteresis losses and a core is generally formed of thin magnetic sheets to facilitate a uniform heating and cooling of the material during the anm nealing process and thus the production of a uniformly annealed product in the finished core.
- the sheets or layers of magnetic material are generally insulated from each other to reduce eddy current losses.
- the magnetic core sheets After the magnetic core sheets ire annealed, they are very sensitive to stresses, vibration and shock to which they are very apt to be subjected while being assembled and tightened together in forming the core,
- the general object of the g invention is to provide an. improved process for producing an annealed magnetic core whereby the magnetic material of the core is subjected toa minimum of stress, vibration, shock, bending or the like after the annealing 3 process has been completed.
- Fig. 1 shows one form of magnetic core which is partly assembled in accordance with the invention
- Fig. 2 shows the complete core in the condition in which it is annealed
- Fig. 3 shows the core after it has been annealed and completely assembled
- Fig. 4 shows the completed core ona somewhat reduced scale with its windings as used in a transformer.
- strip 10 is wound loosely as indicated in Figs.
- This loosely wound or assembled strip preferably has an inner diameter somewhat greater than that desired in the completed core which is shown in Figs. 3 and 4.
- the core is annealed, the particular annealing process depending upon the particular magnetic alloy used in the core.
- the core may be annealed by heating it to from 800 to 900 degrees centigrade and subsequently cooling it slowly. During this annealing process, the heated gases will penetratereadilybetweentheloosely assembledlayers of the core and produce a scale or coating on the surfaces of the layers, this scale servers were assembled tightly together as in the finished core.
- a somewhat different annealing process is necessary in the case of some of the nickel iron alloys which are sometimes used.
- One of these alloys includes about 80% of nickel and 20% of iron and it'has been found that the best results are secured by a double anneal.
- the loosely assembled core may be heated in a hydrogen atmosphere to about 900 centigrade, then cooled slowly, then reheated to about 600 centigrade and then cooled very quickly as by an air blast.
- the layers of the core are tightened together into the completely assembled condition.
- this may be done by holding the inner end of the strip 10 and pulling the outer end around until the layers forming the core are held tightly together as shown in Figs. 3and 4.
- the outer annealing process may be done by holding the inner end of the strip 10 and pulling the outer end around until the layers forming the core are held tightly together as shown in Figs. 3and 4. The outer annealing process.
- Fig. 3 shows the completed core
- Fig. 4 shows the same core on a reduced scale, as it may be used in a transformer, the core being provided with a primary winding 14 and a secondary winding 15.
- the annealing process does not form v a satisfactory insulating scale or coating on the nickel iron alloy as it does on the silicon steel but this sometimes is not necessary if the core is to operate at a very low flux density.
- the layers of the nickel iron alloy core may be insulated before assembly by coating their surfaces with an inorganic insulation, such as a suitable insulating material containing mica, which will not be de stroyed by the high temperature during the If this is done, the nickel iron core may be given the second anneal at layers tightly together, and finally annealing said tightened layers at a temperature lower than that of said first anneal.
- the lower or 600 centigrade temperature after the layersoi the core have been tightened together may also be found desirable in some cases to give the silicon steel core a second anneal at 600 or 650 centigrade afterv the layers have been tightened together.
- the rocess which has been described avoids ta necessity for subjecting a magnetic core to excessive bending and other stresses due to assembly after the core has been properly annealed and thus permits substantially the full benefits of the annealing process to be retained in the finally completed core.
Description
' May 10, 1932. w. E. RUDER ELECTRICAL INDUCTION APPARATUS Filed March 5, 1930 Irfiventor: William E.F?uder; y. W ZZM H i s Attorney.
Patented May 10, 1932 UNITED STATES PATENT OFFICE WILLIAM E. RUDEB, or scnmmcmmr, new YORK, Assian'oa '10 GENERAL unc'rmc company, a ooarolwrronor NEW 'sronx ELECTRICAL INDUCTION APPARATUS Application filed March 15, 1930. Serial No. 488,484.
My invention relates to electrical induction apparatus and more particularly to an improved method for producing magnetic cores for such apparatus. Where good magnetic efiiciency is desired, a magnetic core must be properly annealed to reduce hysteresis losses and a core is generally formed of thin magnetic sheets to facilitate a uniform heating and cooling of the material during the anm nealing process and thus the production of a uniformly annealed product in the finished core. Unless the core is to operate at a very low magnetic density,' the sheets or layers of magnetic material are generally insulated from each other to reduce eddy current losses.
After the magnetic core sheets ire annealed, they are very sensitive to stresses, vibration and shock to which they are very apt to be subjected while being assembled and tightened together in forming the core,
' the result bein an impairment of the magnetic characteristics of the material and a loss of at least part of the advantage of the annealin process. The general object of the g invention is to provide an. improved process for producing an annealed magnetic core whereby the magnetic material of the core is subjected toa minimum of stress, vibration, shock, bending or the like after the annealing 3 process has been completed.
The invention will be better understood from the following description taken in connection with the accompanying drawings in which Fig. 1 shows one form of magnetic core which is partly assembled in accordance with the invention; Fig. 2 shows the complete core in the condition in which it is annealed; Fig. 3 shows the core after it has been annealed and completely assembled, and Fig. 4 shows the completed core ona somewhat reduced scale with its windings as used in a transformer.
Like reference characters indicate similar parts in the different figures of the drawings.
1 and 2 and after the desired length has been wound, it may be secured temporarily and prevented from unwinding by a wrappmg of wire 12. This loosely wound or assembled strip preferably has an inner diameter somewhat greater than that desired in the completed core which is shown in Figs. 3 and 4.
After the la ers forming the core have been loosely assembled as shown in Fig. 2, the core is annealed, the particular annealing process depending upon the particular magnetic alloy used in the core. In the case of the silicon steel whichis now most extensively used, the core may be annealed by heating it to from 800 to 900 degrees centigrade and subsequently cooling it slowly. During this annealing process, the heated gases will penetratereadilybetweentheloosely assembledlayers of the core and produce a scale or coating on the surfaces of the layers, this scale servers were assembled tightly together as in the finished core. A somewhat different annealing process is necessary in the case of some of the nickel iron alloys which are sometimes used. One of these alloys, for example, includes about 80% of nickel and 20% of iron and it'has been found that the best results are secured by a double anneal. With this alloy, the loosely assembled core may be heated in a hydrogen atmosphere to about 900 centigrade, then cooled slowly, then reheated to about 600 centigrade and then cooled very quickly as by an air blast.
After the loosely or partially assembled core has been properly annealed, the layers of the core are tightened together into the completely assembled condition. In the form of core which has been described, this may be done by holding the inner end of the strip 10 and pulling the outer end around until the layers forming the core are held tightly together as shown in Figs. 3and 4. The outer annealing process.
end of the strip 10 may be held in place in the completed core by the welds 13, Fig. 3 shows the completed core and Fig. 4 shows the same core on a reduced scale, as it may be used in a transformer, the core being provided with a primary winding 14 and a secondary winding 15.
The annealing process does not form v a satisfactory insulating scale or coating on the nickel iron alloy as it does on the silicon steel but this sometimes is not necessary if the core is to operate at a very low flux density. If desired, however, the layers of the nickel iron alloy core may be insulated before assembly by coating their surfaces with an inorganic insulation, such as a suitable insulating material containing mica, which will not be de stroyed by the high temperature during the If this is done, the nickel iron core may be given the second anneal at layers tightly together, and finally annealing said tightened layers at a temperature lower than that of said first anneal.
In witness whereof I have hereunto set my hand this 4th day of March, 1930. WILLIAM E. RUDER.
the lower or 600 centigrade temperature after the layersoi the core have been tightened together. It may also be found desirable in some cases to give the silicon steel core a second anneal at 600 or 650 centigrade afterv the layers have been tightened together.
The rocess which has been described avoids ta necessity for subjecting a magnetic core to excessive bending and other stresses due to assembly after the core has been properly annealed and thus permits substantially the full benefits of the annealing process to be retained in the finally completed core.
. The invention has been explained in connection with a particular form of laminated magnetic core but it will be apparent that its application is not so limited and that various changes may be made without departing from the spirit of the invention or the scope of the appended claims. 7
What I laim as new and desire to secure by Letters Patent of the United States, is: 1. The process of producing a laminated magnetic core, said process including the steps of loosely assembling the magnetic layers of said core into approximately final core form, annealing said layers while thus loose- 1y assembled, and subsequently tightening said layers together into a final core form.
2. The process of producing a laminated magnetic core, said process including the steps of loosely assembling the magnetic layers of said core, annealing said layers while loosely assembled, subsequently tightening said layers together, and finally annealing 4 said tightened layers at a temperature lower than that of said first anneal;
3. The process of producing a laminated magnetic core, said process including the steps of rolling strip magnetic sheet material 'intoa loose roll, annealing the layers of said roll-while loosely-assembled, and subsequent-
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US433484A US1857215A (en) | 1930-03-05 | 1930-03-05 | Electrical induction apparatus |
Applications Claiming Priority (1)
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US433484A US1857215A (en) | 1930-03-05 | 1930-03-05 | Electrical induction apparatus |
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US1857215A true US1857215A (en) | 1932-05-10 |
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US433484A Expired - Lifetime US1857215A (en) | 1930-03-05 | 1930-03-05 | Electrical induction apparatus |
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Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2519277A (en) * | 1947-01-15 | 1950-08-15 | Bell Telephone Labor Inc | Magnetostrictive device and alloy and method of producing them |
US2602034A (en) * | 1950-01-18 | 1952-07-01 | United States Steel Corp | Method of making enameling sheets |
DE755102C (en) * | 1936-05-20 | 1954-02-01 | Bosch Gmbh Robert | High-frequency core, which is made up of an insulating carrier material on which the ferromagnetic material is located in strips running in the direction of the magnetic lines of force |
US2671845A (en) * | 1950-04-18 | 1954-03-09 | Benjamin J Chromy | Rapidly heating electric soldering tool |
US2677624A (en) * | 1950-12-06 | 1954-05-04 | United States Steel Corp | Method of enameling sheets |
US2769630A (en) * | 1954-03-19 | 1956-11-06 | John D Keller | Method for annealing tightly wound flat rolled metal stock |
US2920296A (en) * | 1955-01-07 | 1960-01-05 | Gen Electric | Reduction of transformer noise due to magnetostrictive effects |
US3032863A (en) * | 1955-07-22 | 1962-05-08 | Mc Graw Edison Co | Method of constructing stationary induction apparatus |
US3058201A (en) * | 1958-09-08 | 1962-10-16 | Porter Co Inc H K | Method of manufacture of transformer cores |
US3081074A (en) * | 1957-12-19 | 1963-03-12 | Lee Wilson | Apparatus for annealing coils of strip metal |
US3109877A (en) * | 1960-07-01 | 1963-11-05 | Wilson Lee | Apparatus for modifying the composition of strip metal |
US3163553A (en) * | 1958-10-27 | 1964-12-29 | Chromizing Corp | Process of diffusing metal into the surface of sheet metal |
US3259526A (en) * | 1962-04-24 | 1966-07-05 | Honeywell Inc | Method of heat treatment |
US3454728A (en) * | 1965-02-03 | 1969-07-08 | Dual Gebrueder Steidinger | Magnetic head having point-welded laminations and method of producing the same |
US3497949A (en) * | 1966-08-08 | 1970-03-03 | Lucas Industries Ltd | Method of making laminated cores |
US3525964A (en) * | 1968-08-15 | 1970-08-25 | Federal Pacific Electric Co | Zero-phase-sequence transformer |
US4012239A (en) * | 1972-11-21 | 1977-03-15 | Union Siserurgique du Nord et de l'Est de la France, par abreviation "USINOR" | Process for treating steel sheets for the purpose of enamelling the sheets |
US4381600A (en) * | 1978-12-04 | 1983-05-03 | Allied Corporation | Magnetic core winding apparatus |
DE3904313A1 (en) * | 1989-02-14 | 1990-08-16 | Vacuumschmelze Gmbh | METHOD FOR WINDING A SOFT MAGNETIC TAPE TO A CONCLUDED MAGNETIC CORE |
US5521810A (en) * | 1990-11-29 | 1996-05-28 | Mitsubishi Denki Kabushiki Kaisha | Rectifying saturable reactor |
US5815060A (en) * | 1993-11-25 | 1998-09-29 | Mitsui Petrochemical Industries, Ltd. | Inductance element |
US5935433A (en) * | 1990-07-11 | 1999-08-10 | Stefanini; Daniel | Arrangement for and method of treating fluid |
-
1930
- 1930-03-05 US US433484A patent/US1857215A/en not_active Expired - Lifetime
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE755102C (en) * | 1936-05-20 | 1954-02-01 | Bosch Gmbh Robert | High-frequency core, which is made up of an insulating carrier material on which the ferromagnetic material is located in strips running in the direction of the magnetic lines of force |
US2519277A (en) * | 1947-01-15 | 1950-08-15 | Bell Telephone Labor Inc | Magnetostrictive device and alloy and method of producing them |
US2602034A (en) * | 1950-01-18 | 1952-07-01 | United States Steel Corp | Method of making enameling sheets |
US2671845A (en) * | 1950-04-18 | 1954-03-09 | Benjamin J Chromy | Rapidly heating electric soldering tool |
US2677624A (en) * | 1950-12-06 | 1954-05-04 | United States Steel Corp | Method of enameling sheets |
US2769630A (en) * | 1954-03-19 | 1956-11-06 | John D Keller | Method for annealing tightly wound flat rolled metal stock |
US2920296A (en) * | 1955-01-07 | 1960-01-05 | Gen Electric | Reduction of transformer noise due to magnetostrictive effects |
US3032863A (en) * | 1955-07-22 | 1962-05-08 | Mc Graw Edison Co | Method of constructing stationary induction apparatus |
US3081074A (en) * | 1957-12-19 | 1963-03-12 | Lee Wilson | Apparatus for annealing coils of strip metal |
US3058201A (en) * | 1958-09-08 | 1962-10-16 | Porter Co Inc H K | Method of manufacture of transformer cores |
US3163553A (en) * | 1958-10-27 | 1964-12-29 | Chromizing Corp | Process of diffusing metal into the surface of sheet metal |
US3109877A (en) * | 1960-07-01 | 1963-11-05 | Wilson Lee | Apparatus for modifying the composition of strip metal |
US3259526A (en) * | 1962-04-24 | 1966-07-05 | Honeywell Inc | Method of heat treatment |
US3454728A (en) * | 1965-02-03 | 1969-07-08 | Dual Gebrueder Steidinger | Magnetic head having point-welded laminations and method of producing the same |
US3497949A (en) * | 1966-08-08 | 1970-03-03 | Lucas Industries Ltd | Method of making laminated cores |
US3525964A (en) * | 1968-08-15 | 1970-08-25 | Federal Pacific Electric Co | Zero-phase-sequence transformer |
US4012239A (en) * | 1972-11-21 | 1977-03-15 | Union Siserurgique du Nord et de l'Est de la France, par abreviation "USINOR" | Process for treating steel sheets for the purpose of enamelling the sheets |
US4381600A (en) * | 1978-12-04 | 1983-05-03 | Allied Corporation | Magnetic core winding apparatus |
DE3904313A1 (en) * | 1989-02-14 | 1990-08-16 | Vacuumschmelze Gmbh | METHOD FOR WINDING A SOFT MAGNETIC TAPE TO A CONCLUDED MAGNETIC CORE |
US5935433A (en) * | 1990-07-11 | 1999-08-10 | Stefanini; Daniel | Arrangement for and method of treating fluid |
US5521810A (en) * | 1990-11-29 | 1996-05-28 | Mitsubishi Denki Kabushiki Kaisha | Rectifying saturable reactor |
US5815060A (en) * | 1993-11-25 | 1998-09-29 | Mitsui Petrochemical Industries, Ltd. | Inductance element |
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