US3497949A - Method of making laminated cores - Google Patents
Method of making laminated cores Download PDFInfo
- Publication number
- US3497949A US3497949A US659171A US3497949DA US3497949A US 3497949 A US3497949 A US 3497949A US 659171 A US659171 A US 659171A US 3497949D A US3497949D A US 3497949DA US 3497949 A US3497949 A US 3497949A
- Authority
- US
- United States
- Prior art keywords
- pile
- laminae
- laminated cores
- fit
- making laminated
- 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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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/12—Ignition, e.g. for IC engines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0233—Manufacturing of magnetic circuits made from sheets
- H01F41/024—Manufacturing of magnetic circuits made from deformed sheets
-
- 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
- This invention relates to a method of manufacturing laminated cores particularly but not exclusively intended for use in ignition coils.
- a method according to the invention comprises, stacking a plurality of generally rectangular laminae to form a pile, and subjecting said pile, along at least part of its length to an operation whereby some or all of the laminae are deformed to produce a pile which Will fit into a cylinder of smaller diameter than that into which the original pile will fit.
- the invention further resides in a core formed as specified in the preceding paragraph.
- FIGURE 1 is a side elevational view of a core manufactured in accordance with the invention and intended for use in an ignition coil, and
- FIGURES 2 and 3 are sectional views on the lines 22 and 3-3 respectively in 'FIGURE 1.
- the core 11 is manufactured from a plurality of laminae 12.
- the individual rectangular laminae are stacked to form a pile of rectangular crosssection (FIGURE 3).
- the pile of laminae is then stamped in a coining press to shape at least part of the pile to a circular cross-section (FIGURE 2).
- the pile is then bound with adhesive strip to hold the laminae together.
- the deformation of the pile enables a former of smaller diameter to be used than is at present used with known "United States Patent "ice cores, and the smaller former serves in turn to allow a reduction in the amount of Wire in the coil windings.
- one end of the core is left undeformed as shown so that it can be engaged in a complementarily shaped bore in a known form of base member for an ignition coil.
- cores having cross-sectional shapes other than circular could be produced by this method, provided that the finished pile will fit into a cylinder of smaller diameter than that into which the original pile will fit.
- the pile of laminae is spot welded to secure the laminae together in the pile prior to the stamping operation.
- a method of manufacturing laminated cores comprising, stacking a plurality of elongated, generally rectangular laminae to form a pile in which the laminae are parallel, and deforming the pile along part of its length so that the deformed parts of the laminae on both sides of a median plane of the pile parallel with the laminae, are generally concave with respect to the median plane, so that the deformed portion of the pile is of generally circular cross section and will fit into'a cylinder of smaller diameter than that into which the original pile will fit, the undeformed portion of the pile being at one end of the pile.
- a method as claimed in claim 1 including the subsequent step of binding the pile to hold the laminations together.
- a method as claimed in claim 1 including the step of spot welding the pile of laminae to secure the laminae together in the pile prior to the deforming operation.
Description
METHOD OF. MAKING LAMINATED CORES Filed Aug. 8, 1967 FIGZ F163 3,497,949 METHOD OF MAKING LAMINATED CORES John Salt, Shenstone, Lichfield, England, assignor to Joseph Lucas (Industries) Limited, Birmingham, England, a British company Filed Aug. 8, 1967, Ser. No. 659,171 Claims priority, application Great Britain, Aug. 8, 1966, 35,374/ 66 Int. Cl. H01f 3/ 04 U.S. Cl. 29-609 3 Claims ABSTRACT OF THE DISCLOSURE A method of manufacturing laminated cores comprising, stacking a plurality of generally rectangular laminae to form a pile, and subjecting said pile, along at least part of its length, to an operation whereby some or all of the laminae are deformed to produce a pile which will fit into a cylinder of smaller diameter than that into which the original pile will fit.
This invention relates to a method of manufacturing laminated cores particularly but not exclusively intended for use in ignition coils.
A method according to the invention comprises, stacking a plurality of generally rectangular laminae to form a pile, and subjecting said pile, along at least part of its length to an operation whereby some or all of the laminae are deformed to produce a pile which Will fit into a cylinder of smaller diameter than that into which the original pile will fit.
The invention further resides in a core formed as specified in the preceding paragraph.
One example of the invention is illustrated in the accompanying drawings wherein:
FIGURE 1 is a side elevational view of a core manufactured in accordance with the invention and intended for use in an ignition coil, and
FIGURES 2 and 3 are sectional views on the lines 22 and 3-3 respectively in 'FIGURE 1.
Referring to the drawings, the core 11 is manufactured from a plurality of laminae 12. The individual rectangular laminae are stacked to form a pile of rectangular crosssection (FIGURE 3). The pile of laminae is then stamped in a coining press to shape at least part of the pile to a circular cross-section (FIGURE 2). The pile is then bound with adhesive strip to hold the laminae together. The deformation of the pile enables a former of smaller diameter to be used than is at present used with known "United States Patent "ice cores, and the smaller former serves in turn to allow a reduction in the amount of Wire in the coil windings.
Preferably, one end of the core is left undeformed as shown so that it can be engaged in a complementarily shaped bore in a known form of base member for an ignition coil.
It will be appreciated that cores having cross-sectional shapes other than circular could be produced by this method, provided that the finished pile will fit into a cylinder of smaller diameter than that into which the original pile will fit.
In a modification the pile of laminae is spot welded to secure the laminae together in the pile prior to the stamping operation.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is:
1. A method of manufacturing laminated cores comprising, stacking a plurality of elongated, generally rectangular laminae to form a pile in which the laminae are parallel, and deforming the pile along part of its length so that the deformed parts of the laminae on both sides of a median plane of the pile parallel with the laminae, are generally concave with respect to the median plane, so that the deformed portion of the pile is of generally circular cross section and will fit into'a cylinder of smaller diameter than that into which the original pile will fit, the undeformed portion of the pile being at one end of the pile.
2. A method as claimed in claim 1 including the subsequent step of binding the pile to hold the laminations together.
3. A method as claimed in claim 1 including the step of spot welding the pile of laminae to secure the laminae together in the pile prior to the deforming operation.
References Cited UNITED STATES PATENTS 1,857,215 5/1932 Ruder 29-609 X 2,280,981 4/1942 Schuh 336-234 X 2,523,071 9/1950 Somerville 29-609 X 2,671,951 3/1954 Sliwiak 336234 X 3,303,449 2/1967 Stimler 336234 X 3,307,132 2/1967 Ellis 29-609 X 3,408,734 11/1968 Leahy et a1. 29-609 X JOHN F. CAMPBELL, Primary Examiner C. E. HALL, Assistant Examiner U.S. Cl. X.R.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB35374/66A GB1184557A (en) | 1966-08-08 | 1966-08-08 | Laminated Cores. |
Publications (1)
Publication Number | Publication Date |
---|---|
US3497949A true US3497949A (en) | 1970-03-03 |
Family
ID=10377024
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US659171A Expired - Lifetime US3497949A (en) | 1966-08-08 | 1967-08-08 | Method of making laminated cores |
Country Status (4)
Country | Link |
---|---|
US (1) | US3497949A (en) |
BR (1) | BR6791878D0 (en) |
DE (1) | DE1614077B2 (en) |
GB (1) | GB1184557A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3958325A (en) * | 1973-09-01 | 1976-05-25 | Robert Bosch G.M.B.H. | Method and apparatus for making stators for electrical machines |
US4616204A (en) * | 1982-08-09 | 1986-10-07 | Allied Corporation | Cut magnetic core formed of a glassy metal alloy |
US4833980A (en) * | 1987-08-31 | 1989-05-30 | Mannesmann Tally Corporation | High efficiency coil posts for print hammer actuators |
US4924201A (en) * | 1988-08-29 | 1990-05-08 | General Electric Company | Core and coil assembly for a transformer having an amorphous steel core |
US5331735A (en) * | 1993-04-28 | 1994-07-26 | General Electric Company | Method of forming a flexible connector |
US5703556A (en) * | 1995-12-27 | 1997-12-30 | Aisan Kogyo Kabushiki Kaisha | Ignition coil for an internal combustion engine |
US5986532A (en) * | 1996-05-29 | 1999-11-16 | Aisan Kogyo Kabushiki Kaisha | Ignition coil for an internal combustion engine |
US6163949A (en) * | 1996-06-05 | 2000-12-26 | L.H. Carbide Corporation | Method for manufacturing long, slender lamina stack from nonuniform laminae |
US6195875B1 (en) | 1996-06-05 | 2001-03-06 | L.H. Carbide Corporation | Apparatus for manufacturing long, slender lamina stacks from nonuniform laminae |
US6636137B1 (en) | 1996-06-05 | 2003-10-21 | L.H. Carbide Corporation | Ignition coil assembly |
US6650221B2 (en) * | 1994-12-06 | 2003-11-18 | Nippondenso Co., Ltd | Ignition coil for an internal combustion engine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4504812A (en) * | 1983-06-07 | 1985-03-12 | Moermond Donald I | Spherical transformer apparatus |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1857215A (en) * | 1930-03-05 | 1932-05-10 | Gen Electric | Electrical induction apparatus |
US2280981A (en) * | 1939-10-17 | 1942-04-28 | Bell Telephone Labor Inc | Fabrication of laminated metal objects |
US2523071A (en) * | 1944-06-01 | 1950-09-19 | Gen Electric | Electromagnetic induction apparatus |
US2671951A (en) * | 1949-10-03 | 1954-03-16 | Jefferson Electric Co | Transformer core and method of making same |
US3303449A (en) * | 1962-02-28 | 1967-02-07 | Stimler Morton | Toroidal magnetic cores having varying cross-sectional areas |
US3307132A (en) * | 1966-05-13 | 1967-02-28 | Westinghouse Electric Corp | Magnetic core having discrete bends at each corner |
US3408734A (en) * | 1965-01-21 | 1968-11-05 | Emerson Electric Co | Method of manufacturing a dynamoelectric machine |
-
1966
- 1966-08-08 GB GB35374/66A patent/GB1184557A/en not_active Expired
-
1967
- 1967-08-05 DE DE19671614077 patent/DE1614077B2/en active Pending
- 1967-08-07 BR BR191878/67A patent/BR6791878D0/en unknown
- 1967-08-08 US US659171A patent/US3497949A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1857215A (en) * | 1930-03-05 | 1932-05-10 | Gen Electric | Electrical induction apparatus |
US2280981A (en) * | 1939-10-17 | 1942-04-28 | Bell Telephone Labor Inc | Fabrication of laminated metal objects |
US2523071A (en) * | 1944-06-01 | 1950-09-19 | Gen Electric | Electromagnetic induction apparatus |
US2671951A (en) * | 1949-10-03 | 1954-03-16 | Jefferson Electric Co | Transformer core and method of making same |
US3303449A (en) * | 1962-02-28 | 1967-02-07 | Stimler Morton | Toroidal magnetic cores having varying cross-sectional areas |
US3408734A (en) * | 1965-01-21 | 1968-11-05 | Emerson Electric Co | Method of manufacturing a dynamoelectric machine |
US3307132A (en) * | 1966-05-13 | 1967-02-28 | Westinghouse Electric Corp | Magnetic core having discrete bends at each corner |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3958325A (en) * | 1973-09-01 | 1976-05-25 | Robert Bosch G.M.B.H. | Method and apparatus for making stators for electrical machines |
US4616204A (en) * | 1982-08-09 | 1986-10-07 | Allied Corporation | Cut magnetic core formed of a glassy metal alloy |
US4833980A (en) * | 1987-08-31 | 1989-05-30 | Mannesmann Tally Corporation | High efficiency coil posts for print hammer actuators |
US4924201A (en) * | 1988-08-29 | 1990-05-08 | General Electric Company | Core and coil assembly for a transformer having an amorphous steel core |
US5331735A (en) * | 1993-04-28 | 1994-07-26 | General Electric Company | Method of forming a flexible connector |
US6650221B2 (en) * | 1994-12-06 | 2003-11-18 | Nippondenso Co., Ltd | Ignition coil for an internal combustion engine |
US5703556A (en) * | 1995-12-27 | 1997-12-30 | Aisan Kogyo Kabushiki Kaisha | Ignition coil for an internal combustion engine |
US5986532A (en) * | 1996-05-29 | 1999-11-16 | Aisan Kogyo Kabushiki Kaisha | Ignition coil for an internal combustion engine |
US6163949A (en) * | 1996-06-05 | 2000-12-26 | L.H. Carbide Corporation | Method for manufacturing long, slender lamina stack from nonuniform laminae |
US6195875B1 (en) | 1996-06-05 | 2001-03-06 | L.H. Carbide Corporation | Apparatus for manufacturing long, slender lamina stacks from nonuniform laminae |
US6636137B1 (en) | 1996-06-05 | 2003-10-21 | L.H. Carbide Corporation | Ignition coil assembly |
US6745458B2 (en) | 1996-06-05 | 2004-06-08 | L.H. Carbide Corporation | Laminated magnetic core and method for making |
Also Published As
Publication number | Publication date |
---|---|
BR6791878D0 (en) | 1973-02-20 |
DE1614077A1 (en) | 1971-03-25 |
DE1614077B2 (en) | 1971-07-22 |
GB1184557A (en) | 1970-03-18 |
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