US3848331A - Method of producing molded stators from steel particles - Google Patents
Method of producing molded stators from steel particles Download PDFInfo
- Publication number
- US3848331A US3848331A US00396256A US39625673A US3848331A US 3848331 A US3848331 A US 3848331A US 00396256 A US00396256 A US 00396256A US 39625673 A US39625673 A US 39625673A US 3848331 A US3848331 A US 3848331A
- Authority
- US
- United States
- Prior art keywords
- microlaminations
- container
- coil
- core
- conductor
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
-
- 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
- Y10T29/49009—Dynamoelectric machine
-
- 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
- Y10T29/49073—Electromagnet, transformer or inductor by assembling coil and core
-
- 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
- Y10T29/49076—From comminuted material
Definitions
- the core comprises a preformed coil about which a plurality of substantially rectangular microlaminations of a ferromagnetic material are disposed and the components are compressed into a unitary structure.
- the method includes the steps of preforming a coil assembling the coil in fluid-tight container together with a core bar positioned centrally of the coil. Microlaminations are added to the container which is thereafter pressurized to compress the microlaminations about the coil to form a unitary structure.
- the present invention relates to unitary structure which comprises a magnetic core having conductors embedded therein.
- the core is formed by performing a coil and disposing the same within a fluid tight container. Thereafter a core bar is positioned centrally of the coil and a quantity of microlaminations is added to the container to fill the space between the core bar, the coil and the container.
- the container is sealed and subjected to pressure so as to mold the entire unit into a unitary structure which may be thereafter readily removed from the fluid tight container.
- Cores and particularly motor stator cores are generally made from laminations.
- these laminations are punched from electrical steel sheet which are thereafter annealed, insulated and stacked one upon the other in order to form the core.
- Conductors usually in the form of coils are then wound into the slots which have been machined within the core structure or which are formed when the laminations are punched.
- the material which is removed to produce this slot may comprise 2540% of the total area of each lamination and this material is lost as scrap.
- the stacked core produces a slot geometry which is limited because of the die cost. Consequently the slot fill of the conductors is restricted since the conventional method of winding or inserting the conductors into the slot does not permit them to be compressed.
- the present invention teaches that small, substantially rectangular ferromagnetic particles in the form of microlaminations which may be formed for example from plain carbon steel sheet and processed to yield the required magnetic properties, can be molded around a preformed coil assembly.
- the resulting core formed from the microlaminations is scrapless.
- has a high precision bore due to the molding technique utilizes more active magnetic materials since precut slots are eliminated and in addition the molding technique compacts the coil conductors during the molding pres surization and thereby eliminates the need for thick slot liners.
- both better space factors and higher densities of both magnetic material and conductor can be obtained with the result that such molded cores exhibit outstanding magnetic characteristics.
- FIG. 1 is a view of a preformed coil employed in making a molded motor stator with part of the insulation removed;
- FIG. 2 is a view in vertical cross section of a loaded container which is utilized in practicing the method of the present invention
- FIG. 3 is a sectional view of the loaded container taken along the lines 111-111 of FIG 2;
- FIG. 4 is a plot of the applied voltage versus the no load ampers
- FIG. 5 is a plot of the applied voltage versus the no load watts.
- FIG. 6 is a macrograph of a cross-section of the conductors after pressurization and molding of the core into unitary structure.
- One of the basic materials which is employed in the method of the present invention includes small substantially rectangular parallelopipeds of magnetic material, each of which has been termed a microlamination' Essentially this material preferably comprises a low carbon steel and that steel which is normally used for tin cans is an ideal source since it. is abundantly available and is quite low in cost. Of course any other ferromagnetic material which can be obtained in essentially this shaped particle may function just as well. This material is preferably purchased in the so-called black plate condition; that is the condition prior to the application of the metal coating thereto for the tin can stock.
- this material is available in a wide range of thicknesses usually within the range between about 0.005 inch to about 0.014 inch. While a relatively wide range of steel particle sizes and thicknesses appears to be satisfactory it is preferred to have the microlamination formed with the length ranging between about 0.05 inch and about 0.06 inch, a width of between 0.01 inch and 0.02 inch and a thickness of between 0.005 and about 0.008 inch.
- the laminations are usually formed from the tin can stock to the above dimensions by cutting with a high speed rotary die cutter in free space or the material maybe slit to the width desired and then cut with a rotary cutter against a stationary knife edge. In the latter case, the cutter and slitter are in line.
- an atmosphere of wet hydrogen having a dew point in excess of about +60F is utilized.
- the wet hydrogen atmosphere is effective for removing the carbon content to a value of less than about 0.01%
- this coating provides sufficient interlaminar resistance that after the core is molded it will exhibit the required core loss as well as other magnetic characteristics.
- the method of the present invention is applicable to produce any molded core having at least one conductor contained wherein and the method is amenable to other techniques such as the so-called free mold or the fixed mold techniques.
- specific reference will be placed in the following description to a method of molding stators having embedded conductors therein and is applicable to the production of a stator core for a motor it being understood that the method is applicable to both static and dynamic electrical apparatus where conductors areto be molded in a magnetic core.
- FIG. 1 there is shown a stator coil preform 10 which comprises a plurality of vertically extending slot conductors 12 which according to the prior art methods of manufacturing motors would be disposed within the slots of the stator lamination.
- the coil perform 10 having its slot conductors 12 disposed as shown in FIG. 1 is formed on a mandrel or form with the requisite number of end turns 14.
- the coil preform 10 is usually formed of a electrical conductor wire such as magnet wire to which an electrically insulative coating 16 has been applied.
- the coil perform 10 may be wound on a mandrel (not shown) and can be thereafter coated with any suitable resinous or other insulating coating 16 of a thickness not exceeding about 3 mils which will maintain the dimensional integrity of the coil preform 10 after it has been removed from the forming mandrel.
- FIG. 2 there is illustrated a container shown generally at 20 which comprises a unitary structure with a base 22 and upwardly extending sidewalls 24.
- a container 20 may be formed of elastic or flexible polyurethane resin which is cast into the desired shape. Natural rubber, silicone rubbers and synthetic elastomers can be also employed.
- a cast resin base 26 Situated on the base 22 of the container 20 and within the sidewalls 24 is a cast resin base 26 having a centrally disposed opening therein 28 for accommodating a core bar 30 which is centrally disposed within the container 20 and functions to accurately position the bore of the formed molded stator so as to accommodate the rotor of a motor.
- the base 26 is also provided with an annular opening or slot 32 which is disposed for accommodating the end turns 14 of the coil preform 10.
- FIG. 3 will show in cross-section the assembled relationship of the sidewalls 24, lot conductors l2 and core bar 30.
- a selected quantity of the annealed and insulated microlaminations 35 is deposited and positioned in the space 34 between the outer container sidewalls 24 the core bar 30 and the slot windings 12.
- the entire container and its contents are subjeted to vibratory energy so that the green" pack ing factor will be maximized in order to obtain the highest possible packing factor in the completely molded stator after the same has been pressurized.
- the pre formed coil may be energized with a suitable source of electrical current in order to align the microlaminations along the magnetic flux lines to form poles to provide maximum magnetic cooperation with the shape and pattern in which the coil is wound.
- a matching top filler and seal 36 which is essentially a mirror image of the cast base 26 is disposed in a seating arrangement on top of the microlamination 35, the coil end turns 14 and core bar 30. As thus assembled the loaded container is ready for pressurization to effect consolidation.
- isostatic pressure In order to compact the microlaminations 35 uniformly around the preformed coil 14 it is preferred to apply isostatic pressure to the assembly. Such isostatic pressurization will be effective for densifying both. the conductors t2 and the microlaminations and since the container 20 which is preferably formed out of polyurethane is flexible it will permit dimensional changes to occur during the pressurization thereby enabling the attainment of a packing factor in excess of 80%.
- the loaded container is placed within a suitable isostatic pressurization chamber which is thereafter filled with a fluid and pressur ized sufficiently to cause densification of the microlaminations and coils to occur such that the packing factor or density thereof will be in excess of 80% of the volume occupied by the microlaminations and the embedded conductors. While the degree of pressurization above a certain limit is not too cricital, it has been found that with the application of about 50,000 psi a molded stator is produced exhibiting a density or pack ing factor in excess of 80% of theoretical.
- the coil was treated in a fluidized bed of dry powder of an epoxy resin of the polyglycidyl ester of a dihydric phenol type.
- This fluidized bed treatment with the epoxy resin was effective for providing a very hard out flexible electrical insulation coating to the slot conductors as well as the end turns.
- a cast flexible polyurethane container 20 with a cast base 26 for accurately positioning the preformed stator coil was thereafter employed in which the preformed stator coil 10 was positioned within the cast base and a steel core bar 30 was thereafter inserted within the interior of the coil to accurately dimension the bore thereof.
- the container with the cast base 26, preformed coil 10 and core bar were thereafter placed on a virbator and previously prepared microlaminations were poured into the space 34 between the core bar and the preformed coil 110, as well -the pressure was released and the molded stator was then removed from the polyurethane container after removing top filler 36.
- This molded stator was assembled into a'three-quarter horsepower two pole induction motor and tested with the results as graphically illustrated in FIGS. 4 and 5.
- FIG. 41- which is a plot of the applied voltage versus the noload amperes for both a conventionally wound motor a core made of punched laminations as well as the motor of the present invention, shows the improvement effected by the use of the microlaminations in conjunction with the preformed stator coil which are molded into a unitary stator core.
- the no-load amperes are lower for the molded stator motor of this invention.
- FIG. 6 is a photomacrograph of the cross section of the slot conductors after hydrostatic pressing. It will be noted that by the mere application of a hydrostatic pressure of about 50,000 psi the slot conductors have been compressed so as to form substantially regular hexagons throughout the cross section. By the compression of the slot conductors, compression of the microlaminations and the elimination of the usual slot liners, more effective amounts of metal can be put to work in the same spare considerations. It is noted that while the space factor of the conductor approaches no damage was found to the wires or to the insulation. The wire to wire insulation withstood 800 volts and the wire microlamination insulation withstood 2600 volts. Thus there is complete integrity to each of the individual slot conductors which is not disturbed through the subjection of said conductors to the hydrostatic pressing.
- Another advantage of the consolidation of the microlamination magnetic core and conductors into a solid unitary stator is that destructive vibration which takes place between insulated windings and liminations is greatly reduced because of the solid compaction of the windings and the core. Thus failure ofthe electrical insulator by abrasion or cut-through of the enamel on the conductors is avoided.
- a ring core was molded about a wire bundle under the same conditions and thereafter the conductors were machined out and the core alone was evaluated for magnetic performance. Density measurements indicate that the microlaminates had been compressed to a packing factor of about 89%
- the core has a magnetic induction of 12.5 kilogausses where binder may applied field was 50 oersteds. and 14.2 kilogauss when the applied field was I00 oersteds. Moreover. the core exhibited a 15 kilogauss watt loss of 5.9 watts per pound. These are properties superior to laminated cores.
- the method of producing a molded core having at least one conductor embedded therein employing microlaminations in which the microlaminations are formed from a ferromagnetic material, are substantially of'an elongated rectangular cross-section, have been annealed to decarburize, deoxidize and improve the magnetic characteristics thereof, and in which each of the microlaminations is provided with an electrically insulative coating on the surface thereof, the steps comprising, preforming a conductor into a desired configuration, assembling the preformed conductor in a flexible container of predetermined configuration, add- .ing microlaminations about the conductor within the container, sealing the container, compressing the mic rolaminates about the conductor to attain a packing 1 factor in excess of 80%, removing the pressure and thereafter removing the molded core from the container.
- microlaminates are coated with a binder prior to pressurization.
- the method of producing a molded core having at least one conductor embedded therein employing microlaminations in which the microlaminations are formed from a ferromagnetic material, are substantially of an elongated rectangle cross section, have been annealed to decarbonize, deoxidize and improve the mag netic characteristics thereof, and in which each of the microlaminations is provided with an electrically insulative coating on the surface thereof, the steps comprising, preforming the conductor into a coil configuration, assembling the preformed coilcentrally within a flexible container of predetermined configuration, positioning a core bar inpredetermined spaced relation within the coil, adding a predetermined amount of microlaminations to the space between the core bar and container walls and about the coil, sealing the container, pressurizing the microlaminations and coil to attain a packing factor in excess of 80% to form a unitary structure, removing the pressure and thereafter removing the molded core from the container.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00396256A US3848331A (en) | 1973-09-11 | 1973-09-11 | Method of producing molded stators from steel particles |
CA207,483A CA988694A (en) | 1973-09-11 | 1974-08-21 | Method of producing molded stators from steel particles |
GB3822474A GB1477510A (en) | 1973-09-11 | 1974-09-02 | Method of producing moulded cores employing microlaminations |
GB29231/75A GB1482378A (en) | 1973-09-11 | 1974-09-02 | Stators for dynamoelectric machines |
AU73070/74A AU496361B2 (en) | 1973-09-11 | 1974-09-06 | Improvements in or relating to molded stators produced from steel particles (microlaminations) |
FR7430616A FR2243508A1 (fr) | 1973-09-11 | 1974-09-10 | |
DE2443281A DE2443281A1 (de) | 1973-09-11 | 1974-09-10 | Lamellierter magnetkern |
JP49103966A JPS5054805A (fr) | 1973-09-11 | 1974-09-11 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00396256A US3848331A (en) | 1973-09-11 | 1973-09-11 | Method of producing molded stators from steel particles |
Publications (1)
Publication Number | Publication Date |
---|---|
US3848331A true US3848331A (en) | 1974-11-19 |
Family
ID=23566501
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00396256A Expired - Lifetime US3848331A (en) | 1973-09-11 | 1973-09-11 | Method of producing molded stators from steel particles |
Country Status (6)
Country | Link |
---|---|
US (1) | US3848331A (fr) |
JP (1) | JPS5054805A (fr) |
CA (1) | CA988694A (fr) |
DE (1) | DE2443281A1 (fr) |
FR (1) | FR2243508A1 (fr) |
GB (2) | GB1482378A (fr) |
Cited By (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3948690A (en) * | 1973-09-11 | 1976-04-06 | Westinghouse Electric Corporation | Molded magnetic cores utilizing cut steel particles |
FR2391587A1 (fr) * | 1977-05-18 | 1978-12-15 | Matsushita Electric Works Ltd | Procede pour fabriquer des bobines pour rotors de moteurs sans noyau |
US4158582A (en) * | 1978-04-14 | 1979-06-19 | Westinghouse Electric Corp. | Method of making pressed magnetic core components |
US4158561A (en) * | 1978-04-14 | 1979-06-19 | Westinghouse Electric Corp. | Method for preparing oxide coated microlamination particles |
US4158580A (en) * | 1978-04-14 | 1979-06-19 | Westinghouse Electric Corp. | Method of making pressed magnetic core components |
US4158581A (en) * | 1978-04-14 | 1979-06-19 | Westinghouse Electric Corp. | Method of making magnetic component for direct current apparatus |
US4265681A (en) * | 1978-04-14 | 1981-05-05 | Westinghouse Electric Corp. | Method of producing low loss pressed magnetic cores from microlaminations |
US4400675A (en) * | 1981-11-05 | 1983-08-23 | Westinghouse Electric Corp. | Transformer with impedance matching means |
US4486641A (en) | 1981-12-21 | 1984-12-04 | Ruffini Robert S | Inductor, coating and method |
US4776980A (en) * | 1987-03-20 | 1988-10-11 | Ruffini Robert S | Inductor insert compositions and methods |
EP0313514A1 (fr) * | 1987-10-21 | 1989-04-26 | Mavilor Systèmes S.A. | Procédé de fabrication d'un stator sans rainures pour moteur électrique et moteur électrique comprenant un stator fabriqué selon le procédé |
EP0495582A2 (fr) * | 1991-01-14 | 1992-07-22 | Westinghouse Electric Corporation | Machine en forme de disque, à haut rendement et faible réactance comprenant un stator et un rotor |
US5138292A (en) * | 1990-03-21 | 1992-08-11 | Herion Werke Kg | Encapsulated apparatus |
US5403540A (en) * | 1990-10-29 | 1995-04-04 | Corning Incorporated | Heating of formed metal structure by induction |
US5418811A (en) * | 1992-04-08 | 1995-05-23 | Fluxtrol Manufacturing, Inc. | High performance induction melting coil |
US5625243A (en) * | 1993-06-15 | 1997-04-29 | High Speed Tech Oy Ltd. | Rotor construction in an asynchronous electric machine |
US5680692A (en) * | 1994-10-03 | 1997-10-28 | General Electric Company | Fabrication of induction motors |
US5682129A (en) * | 1988-11-07 | 1997-10-28 | N.V. Airpax S.A. | Electrical actuator |
US5990588A (en) * | 1996-12-13 | 1999-11-23 | General Electric Company | Induction motor driven seal-less pump |
US6232681B1 (en) * | 2000-03-23 | 2001-05-15 | Delco Remy International, Inc. | Electromagnetic device with embedded windings and method for its manufacture |
US20020175588A1 (en) * | 2001-05-24 | 2002-11-28 | Rajasingham Arjuna Indraes Waran | Axial gap electrical machine |
US6524380B1 (en) | 2000-03-06 | 2003-02-25 | Hamilton Sundstrand Corporation | Magnesium methylate coatings for electromechanical hardware |
US7078843B2 (en) | 2003-09-05 | 2006-07-18 | Black & Decker Inc. | Field assemblies and methods of making same |
US7146706B2 (en) | 2003-09-05 | 2006-12-12 | Black & Decker Inc. | Method of making an electric motor |
US7205696B2 (en) | 2003-09-05 | 2007-04-17 | Black & Decker Inc. | Field assemblies having pole pieces with ends that decrease in width, and methods of making same |
US7211920B2 (en) | 2003-09-05 | 2007-05-01 | Black & Decker Inc. | Field assemblies having pole pieces with axial lengths less than an axial length of a back iron portion and methods of making same |
US7510766B2 (en) | 2003-02-05 | 2009-03-31 | Corporation Imfine Inc. | High performance magnetic composite for AC applications and a process for manufacturing the same |
US20090134719A1 (en) * | 2006-04-14 | 2009-05-28 | Ciiis, Llc | Electric motor containing ferromagnetic particles |
US20090240096A1 (en) * | 2005-07-27 | 2009-09-24 | Neuronetics, Inc. | Magnetic core for medical procedures |
US20090315427A1 (en) * | 2008-06-23 | 2009-12-24 | Jung Moo Seo | Slotless motor |
US20100040488A1 (en) * | 2007-02-23 | 2010-02-18 | Yasuhiro Yukitake | Motor and electric pump |
FR2946811A1 (fr) * | 2009-06-11 | 2010-12-17 | Patrick Chevallier | Stator pour generatrice electrique |
WO2012080586A1 (fr) * | 2010-12-17 | 2012-06-21 | Verteole | Stator pour génératrice électrique |
US8207647B2 (en) | 2003-09-05 | 2012-06-26 | Black & Decker Inc. | Power tools with motor having a multi-piece stator |
US20140252912A1 (en) * | 2011-11-03 | 2014-09-11 | Moteurs Leroy-Somer | Rotor of an electric machine |
CN104347260A (zh) * | 2013-07-26 | 2015-02-11 | 郑佐 | 一种一体成型牵引电磁铁的制作工艺 |
US20200227955A1 (en) * | 2019-01-14 | 2020-07-16 | GM Global Technology Operations LLC | Molded core assemblies |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012202019A1 (de) * | 2012-02-10 | 2013-08-14 | Ksb Aktiengesellschaft | Herstellungsverfahren für einen Rotor sowie Rotor |
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US1982689A (en) * | 1931-03-16 | 1934-12-04 | Johnson Lab Inc | Magnetic core material |
US2048222A (en) * | 1931-10-08 | 1936-07-21 | Deutsche Edelstahlwerke Ag | Improvements, in or relating to magnets |
US2064773A (en) * | 1933-06-01 | 1936-12-15 | Ferrocart Corp Of America | Method for making magnetic cores |
US2241441A (en) * | 1938-07-15 | 1941-05-13 | Western Electric Co | Manufacture of magnetic bodies |
US2419847A (en) * | 1944-06-02 | 1947-04-29 | Gen Electric | Powdered iron magnetic core |
US2966704A (en) * | 1957-01-22 | 1961-01-03 | Edward D O'brian | Process of making a ferrite magnetic device |
US3255052A (en) * | 1963-12-09 | 1966-06-07 | Magnetics Inc | Flake magnetic core and method of making same |
-
1973
- 1973-09-11 US US00396256A patent/US3848331A/en not_active Expired - Lifetime
-
1974
- 1974-08-21 CA CA207,483A patent/CA988694A/en not_active Expired
- 1974-09-02 GB GB29231/75A patent/GB1482378A/en not_active Expired
- 1974-09-02 GB GB3822474A patent/GB1477510A/en not_active Expired
- 1974-09-10 DE DE2443281A patent/DE2443281A1/de active Pending
- 1974-09-10 FR FR7430616A patent/FR2243508A1/fr not_active Withdrawn
- 1974-09-11 JP JP49103966A patent/JPS5054805A/ja active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US1982689A (en) * | 1931-03-16 | 1934-12-04 | Johnson Lab Inc | Magnetic core material |
US2048222A (en) * | 1931-10-08 | 1936-07-21 | Deutsche Edelstahlwerke Ag | Improvements, in or relating to magnets |
US2064773A (en) * | 1933-06-01 | 1936-12-15 | Ferrocart Corp Of America | Method for making magnetic cores |
US2241441A (en) * | 1938-07-15 | 1941-05-13 | Western Electric Co | Manufacture of magnetic bodies |
US2419847A (en) * | 1944-06-02 | 1947-04-29 | Gen Electric | Powdered iron magnetic core |
US2966704A (en) * | 1957-01-22 | 1961-01-03 | Edward D O'brian | Process of making a ferrite magnetic device |
US3255052A (en) * | 1963-12-09 | 1966-06-07 | Magnetics Inc | Flake magnetic core and method of making same |
Cited By (63)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3948690A (en) * | 1973-09-11 | 1976-04-06 | Westinghouse Electric Corporation | Molded magnetic cores utilizing cut steel particles |
FR2391587A1 (fr) * | 1977-05-18 | 1978-12-15 | Matsushita Electric Works Ltd | Procede pour fabriquer des bobines pour rotors de moteurs sans noyau |
US4158582A (en) * | 1978-04-14 | 1979-06-19 | Westinghouse Electric Corp. | Method of making pressed magnetic core components |
US4158561A (en) * | 1978-04-14 | 1979-06-19 | Westinghouse Electric Corp. | Method for preparing oxide coated microlamination particles |
US4158580A (en) * | 1978-04-14 | 1979-06-19 | Westinghouse Electric Corp. | Method of making pressed magnetic core components |
US4158581A (en) * | 1978-04-14 | 1979-06-19 | Westinghouse Electric Corp. | Method of making magnetic component for direct current apparatus |
US4265681A (en) * | 1978-04-14 | 1981-05-05 | Westinghouse Electric Corp. | Method of producing low loss pressed magnetic cores from microlaminations |
US4400675A (en) * | 1981-11-05 | 1983-08-23 | Westinghouse Electric Corp. | Transformer with impedance matching means |
US4486641A (en) | 1981-12-21 | 1984-12-04 | Ruffini Robert S | Inductor, coating and method |
US4776980A (en) * | 1987-03-20 | 1988-10-11 | Ruffini Robert S | Inductor insert compositions and methods |
US4837921A (en) * | 1987-10-21 | 1989-06-13 | Mavilor Systemes S. A. | Process for manufacturing a grooveless stator for electric motor |
EP0313514A1 (fr) * | 1987-10-21 | 1989-04-26 | Mavilor Systèmes S.A. | Procédé de fabrication d'un stator sans rainures pour moteur électrique et moteur électrique comprenant un stator fabriqué selon le procédé |
WO1989004540A1 (fr) * | 1987-10-30 | 1989-05-18 | R.S. Ruffini & Associates | Compositions et procedes de production de pieces rapportees d'inducteurs |
US5682129A (en) * | 1988-11-07 | 1997-10-28 | N.V. Airpax S.A. | Electrical actuator |
US5138292A (en) * | 1990-03-21 | 1992-08-11 | Herion Werke Kg | Encapsulated apparatus |
US5403540A (en) * | 1990-10-29 | 1995-04-04 | Corning Incorporated | Heating of formed metal structure by induction |
EP0495582A2 (fr) * | 1991-01-14 | 1992-07-22 | Westinghouse Electric Corporation | Machine en forme de disque, à haut rendement et faible réactance comprenant un stator et un rotor |
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Also Published As
Publication number | Publication date |
---|---|
JPS5054805A (fr) | 1975-05-14 |
CA988694A (en) | 1976-05-11 |
GB1482378A (en) | 1977-08-10 |
FR2243508A1 (fr) | 1975-04-04 |
AU7307074A (en) | 1976-03-11 |
DE2443281A1 (de) | 1975-03-20 |
GB1477510A (en) | 1977-06-22 |
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Owner name: A. O. SMITH CORPORATION Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO LICENSE RECITED.;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION;REEL/FRAME:004583/0789 Effective date: 19860516 |