US3778897A - Method of producing magnetic core parts - Google Patents

Method of producing magnetic core parts Download PDF

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Publication number
US3778897A
US3778897A US00202881A US3778897DA US3778897A US 3778897 A US3778897 A US 3778897A US 00202881 A US00202881 A US 00202881A US 3778897D A US3778897D A US 3778897DA US 3778897 A US3778897 A US 3778897A
Authority
US
United States
Prior art keywords
sheet
struts
portions
magnetic core
laminations
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
Application number
US00202881A
Other languages
English (en)
Inventor
E Bock
O Theml
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US3778897A publication Critical patent/US3778897A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • Y10T29/49789—Obtaining plural product pieces from unitary workpiece
    • Y10T29/49796—Coacting pieces
    • 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
    • Y10T29/49799—Providing transitory integral holding or handling portion
    • 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
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49936—Surface interlocking

Definitions

  • [5 7 ABSTRACT In a method of producing at least two separate magnetic core parts that are each made up of stacked laminations, the following steps are provided: the step of stamping sections out of an individual metal sheet to form connecting struts located between and extending transversely to lamination sections of the sheet, and the step of displacing the lamination sections toward each other in a longitudinal direction of the lamination sections for shearing the struts so as to separate the lamination sections from one another.
  • a blank for performing steps in a method of producing at least two separate magnetic core parts that are each made up of stacked laminations includes a sheet of metal having a longitudinal axis and having at least one opening having a longitudinal axis, the opening being located in the sheet so that the axes are mutually perpendicular.
  • the sheet also has two notches extending inwardly transverse to the axis of the sheet from respective sides thereof and the opening is adjacent the notches to form struts therebetween.
  • the invention relates to a method of producing divided magnetic core parts of stacked metal sheets or laminations.
  • electro-magnetic switching devices it is necessary, particularly for U-shaped magnets, to assemble the U member from two angles between which a defined air gap must be provided as a remanence air gap. This had been accomplished in a manner such that the L or angularly shaped individual sheets were punched out and thereafter packaged according to the desired number of individual laminations.
  • Two magnetic core portions stacked in this way were then positioned mutually adjacent and separated from each other by an air gap and and were connected with each other by a cover sheet held by rivets.
  • individual sheets each of which corresponds to at least two magnet core parts are punched to have thin joining struts extending essentially transversely to the longitudinal direction of the magnet core parts.
  • the joining struts are sheared off by shifting the individual sections toward each other in the longitudinal direction of the magnetic core parts. In order to make it unnecessary to shear off each sheet individually, it is preferable to effect the shearing after the individual sheets have been packaged.
  • a preferred blank for performing the method of the invention was found to be one which contains at least one trapezoidal opening whose longitudinal axis is essentially transverse to the longitudinal axis of the blank. Also, at least portions of at least one other trapezoidal opening have substantially the same shape as the firstmentioned opening, each of the additional openings having two mutually parallel bases and a non-parallel side.
  • the two additional openings are disposed in the sheet such that their short bases and the short base of the first-mentioned opening lie on mutually adjacent parallel lines, respectively.
  • Struts separating the additional openings from the first-mentioned openings are located substantially in the extension lines of the nonparallel sides of the first-mentioned opening and of the respective non-parallel sides of the additional openings.
  • This embodiment of the blank is especially preferable because it allows main-taining an essentially uniform air gap in a simple manner.
  • the width of the connecting struts corresponds approximately to the sheet thickness.
  • Dimensioning the magnetically effective air gap width is particularly simple when the length of the longitudinal side of an opening amounts to about the entire width of the sheet less twice the sheet thickness, that is, the remaining remnant parts must not bend.
  • the depth and inclination of the non-parallel sides of the trapezoidal opening is selected so that when the individual lamination sections are sheared off, an air gap width can be adjusted which will remain constant over the entire air gap length.
  • FIG. 1 illustrates a blank comprising two mutually connected individual metal sheet sections having connecting struts extending transversely to the direction of separation;
  • FIG. 2 illustrates the individual lamination sections of FIG. 1 after being sheared
  • FIG. 3 shows another embodiment of a blank in the form of a punched sheet having trapezoidal openings
  • FIG. 4 is a punched sheet similar to the blank of FIG. 3 and comprises only one trapezoidal opening which extends almost over its entire width;
  • FIG. 5 shows the punched sheet of FIG. 4 with the connecting struts sheared off.
  • one of the U-shaped metal sheets 1 with which the magnetic core parts are stacked is shown comprising two individual lamination sections 2 and 3 which are substantially L-shaped.
  • the individual sections 2 and 3 are connected via struts 4 and 5 which extend essentially perpendicularly to the longitudinal direction of the sheet l or, more precisely, transversely to the bight portion of the composite U- shapd member.
  • the connecting struts 4 and 5 are formed by providing rectangular openings 6, 7 and 8.
  • the connected individual sections 2 and 3 are punched in the form seen in FIG. 1 to form a blank.
  • the sections are then placed into the position shown in FIG. 2 by applying pressure as indicated by the arrows in FIG. I.
  • An insulating foil 9 corresponding to the air gap width is inserted between the individual sheets 2 and 3 and keeps the sheets 2 and 3 spaced at an appropriate distance.
  • the connecting struts 4 and 5 are severed so that a magnetic shunt is precluded.
  • a punched sheet section shown in FIG. 3, is advantageously used.
  • the connecting struts l2 serve here as connecting members for trapezoidal openings 13, 14, or parts thereof, which are denoted by reference numeral 15.
  • the trapezoidal openings are disposed with their longitudinal axes transversely to the longitudinal axis of the magnetic core, which is indicated in FIG. 3 with a dashed line 16.
  • the short longitudinal sides or bases 17 of the trapezoids face each other.
  • the connecting struts 12 are positioned substantially in the extension lines of two non'parallel sides 18,19 of the trapezoidal openings, so that the aforementioned ends 10,11 are virtually non-existent.
  • FIG. shows how the shearing locations 20 become positioned when the individual lamination sections 2 and 3 are pushed together.
  • the longer longitudinal base 21 of the trapezoidal opening 22 is present in the predominant part of the total width of the individual sections 2 and 3, so that the remaining residual portions 23 have hardly any effect on the determination of the magnetic air gap.
  • the remaining portions 23 may also have a great air gap width relative to the air gap 24 corresponding to the large longitudinal side 21.
  • the width of the air gap 24 is again determined by an inserted foil.
  • the embodiment of FIG. 4 has the advantage that work may be conducted with a relatively large-area punching stamp so that the stamp has a relatively good service life.
  • FIGS. 4 and 5 does not afford an effective air gap length enlarged relative to the perpendicular to both individual sections 2, 3 so that, as mentioned previously, the remnant parts 23 can provide a larger air gap.
  • This affords the advantage of connecting both magnetic core parts which are assembled from the individual sections 2 and 3, by casting the dove tail connections of at least the residual portions 23 of the total air gap.
  • the magnet core parts comprising individual sections 2 and 3 are riveted together through mounted-on cover sheets such that the lamination sections 2, 3 are at a spacing determined by the inserted foil.
  • FIGS. 3 to 5 is preferable to the embodiment of FIGS. 1 and 2.
  • a method of producing magnetic core parts of stacked laminations comprising the steps of stamping sections out of a plurality of metal sheets each having a longitudinal axis to form laminations, each lamination having first and second portions connected to each other by struts extending transversely to the longitudinal axis of the sheets, placing the laminations one upon the other with said first and second portions aligned to form a stack of said laminations, and displacing said first and second portions toward each other in said longitudinal direction to shear the struts and sever said portions from one another.
  • notches define a plunger-like projection in one of the portions and the opening defines a cutout in the other one of the portions, the cutout being opposite the projection in the longitudinal direction, the struts extending laterally of the projection to the longitudinal sides a of the cutout, respectively, and displacing the portions toward each other in the longitudinal direction to shear the struts by inserting the projection into the cutout.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Soft Magnetic Materials (AREA)
  • Magnetic Heads (AREA)
US00202881A 1970-12-01 1971-11-29 Method of producing magnetic core parts Expired - Lifetime US3778897A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2059064A DE2059064C3 (de) 1970-12-01 1970-12-01 Verfahren zum Herstellen von Magnetkernteilen

Publications (1)

Publication Number Publication Date
US3778897A true US3778897A (en) 1973-12-18

Family

ID=5789640

Family Applications (1)

Application Number Title Priority Date Filing Date
US00202881A Expired - Lifetime US3778897A (en) 1970-12-01 1971-11-29 Method of producing magnetic core parts

Country Status (15)

Country Link
US (1) US3778897A (de)
JP (1) JPS5310655B1 (de)
AT (1) AT315320B (de)
BR (1) BR7107992D0 (de)
CA (1) CA972932A (de)
CH (1) CH554062A (de)
DE (1) DE2059064C3 (de)
DK (1) DK135559C (de)
ES (1) ES397527A1 (de)
FR (1) FR2116423B1 (de)
GB (1) GB1336036A (de)
IT (1) IT941785B (de)
SE (1) SE367730B (de)
TR (1) TR17136A (de)
ZA (1) ZA711648B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6069428A (en) * 1998-01-21 2000-05-30 Fasco Industries, Inc. Brushless DC motor assembly
US6982532B2 (en) 2003-12-08 2006-01-03 A. O. Smith Corporation Electric machine
US20070138898A1 (en) * 2005-12-16 2007-06-21 Promovet S.R.L. Synchronous motor with permanent-magnet rotor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2724867A (en) * 1952-02-26 1955-11-29 Int Harvester Co Roller and shaft assembly
US3122880A (en) * 1961-12-19 1964-03-03 Greiner Electronic A G Stud for fastening the outer end of a hair spring for a timepiece
US3453715A (en) * 1966-12-12 1969-07-08 Sheller Globe Corp Method of making a temperature sensing bulb
US3571920A (en) * 1965-12-16 1971-03-23 Berg Electronics Inc Method for transistor manufacture
US3624896A (en) * 1968-06-26 1971-12-07 Dowty Technical Dev Ltd Method of making an electrical moving coil device
US3694903A (en) * 1970-06-03 1972-10-03 Alliance Mfg Co Method of making a stator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2724867A (en) * 1952-02-26 1955-11-29 Int Harvester Co Roller and shaft assembly
US3122880A (en) * 1961-12-19 1964-03-03 Greiner Electronic A G Stud for fastening the outer end of a hair spring for a timepiece
US3571920A (en) * 1965-12-16 1971-03-23 Berg Electronics Inc Method for transistor manufacture
US3453715A (en) * 1966-12-12 1969-07-08 Sheller Globe Corp Method of making a temperature sensing bulb
US3624896A (en) * 1968-06-26 1971-12-07 Dowty Technical Dev Ltd Method of making an electrical moving coil device
US3694903A (en) * 1970-06-03 1972-10-03 Alliance Mfg Co Method of making a stator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6069428A (en) * 1998-01-21 2000-05-30 Fasco Industries, Inc. Brushless DC motor assembly
US6307337B1 (en) 1998-01-21 2001-10-23 Fasco Industries, Inc. Brushless dc motor assembly
US6982532B2 (en) 2003-12-08 2006-01-03 A. O. Smith Corporation Electric machine
US7259487B2 (en) 2003-12-08 2007-08-21 A.O. Smith Corporation Electric machine including circuit board mounting means
US20070138898A1 (en) * 2005-12-16 2007-06-21 Promovet S.R.L. Synchronous motor with permanent-magnet rotor
US7755245B2 (en) * 2005-12-16 2010-07-13 Promovet S.R.L. Synchronous motor with permanent-magnet rotor

Also Published As

Publication number Publication date
DE2059064A1 (de) 1972-06-22
ZA711648B (en) 1972-01-26
DE2059064B2 (de) 1974-03-21
FR2116423B1 (de) 1974-05-10
ES397527A1 (es) 1974-05-16
GB1336036A (en) 1973-11-07
CA972932A (en) 1975-08-19
DE2059064C3 (de) 1974-10-17
DK135559B (da) 1977-05-16
JPS5310655B1 (de) 1978-04-15
AT315320B (de) 1974-05-27
IT941785B (it) 1973-03-10
BR7107992D0 (pt) 1973-04-12
DK135559C (da) 1977-11-07
SE367730B (de) 1974-06-04
CH554062A (de) 1974-09-13
TR17136A (tr) 1974-04-25
FR2116423A1 (de) 1972-07-13

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