US3828426A - Method of fabricating magnetomotive devices - Google Patents

Method of fabricating magnetomotive devices Download PDF

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Publication number
US3828426A
US3828426A US00318521A US31852172A US3828426A US 3828426 A US3828426 A US 3828426A US 00318521 A US00318521 A US 00318521A US 31852172 A US31852172 A US 31852172A US 3828426 A US3828426 A US 3828426A
Authority
US
United States
Prior art keywords
pole
shoe
fabricating
magnetomotive
casting
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
US00318521A
Other languages
English (en)
Inventor
R Phelon
Amsterdam J Van
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.)
PHELON CO Inc
PHELON R CO INC US
Original Assignee
PHELON CO Inc
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 PHELON CO Inc filed Critical PHELON CO Inc
Priority to US00318521A priority Critical patent/US3828426A/en
Priority to CA169,900A priority patent/CA980408A/en
Priority to GB1877673A priority patent/GB1377910A/en
Priority to AU54748/73A priority patent/AU474049B2/en
Priority to ES414869A priority patent/ES414869A1/es
Priority to FR7320037A priority patent/FR2211732B1/fr
Priority to JP48069128A priority patent/JPS52521B2/ja
Priority to DE2331951A priority patent/DE2331951A1/de
Priority to IT51009/73A priority patent/IT985774B/it
Priority to SE7308889A priority patent/SE393494B/xx
Priority to ES1974199479U priority patent/ES199479Y/es
Priority to US477335A priority patent/US3885177A/en
Application granted granted Critical
Publication of US3828426A publication Critical patent/US3828426A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • 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
    • Y10T29/49012—Rotor
    • 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
    • Y10T29/49799—Providing transitory integral holding or handling portion

Definitions

  • ABSTRACT Method of fabricating magnetomotive devices by encapsulating a unitary pole-shoe magnet group into a casting of nonmagnetic material.
  • the pole-shoe portion of the group is formed of a plurality of integral, stacked ferromagnetic laminations, each having between the shoe portions an interconnecting web disposed radially inward of the outer surface of the poleshoes.
  • the magnetomotive device is cast so that the outer surfaces of the pole-shoe laminations are generally flush with the outer diameter of the casting.
  • the disclosure is concerned with a pole-shoe magnet group for a flywheel magneto which is composed of a plurality of stacked ferromagnetic laminations embracing a permanent magnet.
  • Each of the laminations has at least two pole-shoe portions interconnected by a web disposed radially inward of the outer surface of the pole-shoes whereby the web may be removed by a single drilling operation.
  • Magnetomotive devices such as a flywheel magneto, serve the dual function of a spark ignition generator and the engine flywheel.
  • magnetos are usually aluminum or zinc castings having a pole-shoe magnet group encapsulated in the rim of the rotor.
  • the poleshoe group generally consists of a plurality of stacked ferromagnetic laminations riveted together in clamping relation about a permanent bar magnet.
  • Each of the laminations includes two pole-shoe portions interconnected by a web so that each lamination is integral as is also the assembly of the laminations and permanent magnet.
  • This arrangement facilitates the handling of the poleshoe component, including its placement into the mold cavity used in casting the nonmagnetic flywheel body.
  • the web interconnecting the two pole-shoe portions has heretofore been disposed radially outward of the outer surface of the pole-shoes.
  • Another object of this invention is to provide a method of fabricating a die cast magnetomotive component of the above type wherein the laminated poleshoe group is constructed so that its interconnecting web portion may be removed in an economical and relatively fast drilling or broaching operation.
  • a further object of this invention is to provide a poleshoe magnet group for use in fabricating cast magnetomotive components of the above type in which each of the stacked laminations of the magnet group has an interconnecting web bridging the space between the pole-shoe portions thereof with the web disposed radially inward of the outer diameter of the pole-shoe portions of the group.
  • FIG. 1 is a plan view of a pole-shoe magnet group of the type which may be used in carrying out this invention
  • FIG. 2 is an end elevational view of the group
  • FIG. 3 is a section taken along line 3-3 of FIG. 1;
  • FIG. 4 is a plan view of one type of flywheel magneto fabricated in accordance with this invention and containing the magnet group of FIG. 1;
  • FIG. 5 is a section taken along line 55 of FIG. 4.
  • FIG. 6 is a partial plan view of the flywheel of FIG. 4, partly in section, showing the pole-shoe group in its final form.
  • FIG. 1 a pole-shoe magnet group 8 of the type embodying this invention and which may be used in carrying out the method of the invention.
  • the group is composed of an assembly of a plurality of stacked ferromagnetic laminations l0 fastened together by rivets 11 in superposed relationship.
  • Each lamination 10, of which twelve are shown in the drawings, consists of a pair of pole-shoe portions 12 having a pole-shoe radius of curvature r corresponding to the final diameter of a flywheel into which the magnet group is to be die cast as will be hereinafter more fully described.
  • Each lamination includes a pair of circumferentially spaced leg portions 13 extending radially of the pole-shoe surfaces 12 and which define therebetween a cavity for receiving a permanent magnet 14 clamped in chord-like orientation between the opposed inner wall portions of the legs 13.
  • each leg includes a small finger-like extension or tongue 15 which is struck over the outer ends of the magnet 14 to assist in holding the magnet in place between the legs.
  • the outer ends of the magnet 14 may be formed to extend slightly over the outer surface of the leg portions 13 so that the magnet is securely retained in position, forming together with the stacked pole-shoe laminations 10, a unitary assembly.
  • Each lamination 10 is provided with a hole 16 through each of its leg portions 13 and these holes are aligned in registered relation providing, in effect, a bore which extends entirely through each leg portion of the lamination stack. These bores provide means by which the magnet group will be held in place in the die cavity for the casting operation.
  • Eachlamination 10 also includes an interconnecting web 18 which bridges or spans the circumferential distance between opposed inner end surfaces 20 of the pole-shoes 12.
  • the webs 18 extend from the lower end portions of the end walls 20 and join in a cylindrical hub 22.
  • Each lamination 10 is provided with a hole 24 concentric with the cylindrical hub portion 22 of the web whereby a third bore is provided through the stacked laminations which serves as a drill pilot for the subsequent removal of the webs 18 in the completed flywheel.
  • the web 18 is preferably located entirely inwardly of the periphery defined by the outer radius of curvature of the pole-shoes 12.
  • This unitary poleshoe assembly or component which is to serve as the magnet group for a flywheel magneto or other magnetomotive device is placed in the cavity of a casting die by setting the holes 16 on appropriately sized pins.
  • a counterweight 28, FIG. 4 is also provided and includes a pair of circumferentially spaced holes whereby the counterweight may be placed diametrically opposite the magnet group on a second pair of pins. With the magnetic group and the counterweight in place, the mold is closed and charged with a suitable molten material, such as aluminum or zinc and a flywheel of any desired configuration is cast.
  • the mold size is designed so that the final diameter of the flywheel will be flush with the radius of curvature of the pole-shoe group.
  • One such flywheel is shown generally at 32 in FIGS. 4 and 5.
  • a flywheel having an inwardly facing, concave pole-shoe magnet group may also be employed for installations having a stator within the flywheel rim.
  • the flywheel 32 is cast with a bore 34 and keyway 36 adapted to fit a particular engine drive shaft. Radially extending cooling fins 38 are formed on the outerside of the flywheel. A beveled recess or hole 40 is formed in the casting in alignment with the bore 24 of the pole-shoegroup and is formed by a correspondingly shaped projection in the die cavity. This provides a pilot hole in'the aluminum or zinc casting for a drill bit.
  • the flywheel After the flywheel is cast, it may be necessary to trim off any flashing. This is preferably done by means of a simple trimming or stamping operation which will simultaneously shave away any residual casting material coating the outer surface of the pole-shoes 12. When this trimming operation is completed, the outer surfaces of the pole-shoes 12 will be fully exposed and exactly flush with the outer surfaces 29 of the casting.
  • the web 18 is then-removed or severed by broaching, or preferably drilling out the cylindrical hub portion 22 of the web 18, leaving a bore 44, as shown in FIG. 6. If necessary or desirable this bore may be filled with a lightweight nonmagnetic material. Drilling to remove the web is readily accomplished since the steel web is cylindrical in cross section and dimensioned for clean and uniform removal in a single pass of a standard size drill bit. The drill size selected will be just slightly larger than the diameter'of the hub 22 so that a thin section, about the steel hub, of the softer nonmagnetic casting material will be reamed away, thus insuring a complete severance of the web 18.
  • pilot recess 40 and the bore 24 insure simple and rapid drill location and accurate drill alignment throughout the drilling operation.
  • the hub would have the same cross section from pole-topole, thus obviating the hub portion 22.
  • the two poleshoes 12 are then magnetically separated and the curved surfaces thereof lying about the pole-shoe radius serve as surfaces of flux emanation" whereby the magnetic lines of flux generated by the permanent magnet 14 arch from pole-to-pole outwardly of the poleshoe radius of the flywheel magneto for magnetic linkage with the coil-core group of a stator component (not shown) situated closely adjacent the rim of the flywheel rotor.
  • a stator component not shown
  • the concave inner surfaces of the pole-shoes would constitute the surfaces of flux emanation from which the lines of flux would arch inwardly for linkage with the stator core.
  • this invention contemplates pole-shoe magnet groups having interconnecting web portions disposed inwardly of the surfaces of flux emanation of the pole-shoes.
  • pole-shoe groups of the type shown and described herein could be manufactured at one facility and shipped and/or sold to other plant facilities for encapsulation in flywheel magnetos in accordance with the method herein disclosed.
  • Method of fabricating magnetomotive devices comprising the steps of encapsulating in a nonmagnetic body having an axis of rotation, at pole-shoe magnet group including a magnet and a plurality of integral, stacked ferromagnetic laminations, each having poleshoe portions, said portions having respective surfaces defining in part a cylindrical surface about a given radius of curvature from said axis of rotation and serving as surfaces of flux emanation, and a web interconnecting said pole-shoe portions and being disposed within said nonmagnetic body so as not to extend radially outward of said cylindrical surface defined in part by said pole-shoe surfaces, forming said magnetomotive device such that said surfaces of flux emanation are generally flush with a final diameter of the nonmagnetic body and thereafter removing the webs of said stacked laminations such that said pole-shoes are magnetically separated whereby the magnetic lines of flux generated by said magnet extend from pole-to-pole outwardly of said surfaces of

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
US00318521A 1972-12-26 1972-12-26 Method of fabricating magnetomotive devices Expired - Lifetime US3828426A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US00318521A US3828426A (en) 1972-12-26 1972-12-26 Method of fabricating magnetomotive devices
CA169,900A CA980408A (en) 1972-12-26 1973-04-17 Method of fabricating magnetomotive devices
GB1877673A GB1377910A (en) 1972-12-26 1973-04-18 Method of fabricating magnetmotive devices
AU54748/73A AU474049B2 (en) 1972-12-26 1973-04-19 Method of fabricating and a pole-shoe magnet group for a magnetomotive device
ES414869A ES414869A1 (es) 1972-12-26 1973-05-18 Un metodo para fabricar dispositivos magnetomotores.
FR7320037A FR2211732B1 (it) 1972-12-26 1973-06-01
JP48069128A JPS52521B2 (it) 1972-12-26 1973-06-19
DE2331951A DE2331951A1 (de) 1972-12-26 1973-06-22 Verfahren zum herstellen magnetomotorischer vorrichtungen und dabei zu verwendende polschuh- und magnetbaugruppe
IT51009/73A IT985774B (it) 1972-12-26 1973-06-25 Gruppo magnetico per magneti e meto do per fabbricarlo
SE7308889A SE393494B (sv) 1972-12-26 1973-06-25 Sett att tillverka en svenghjulsmagnet
ES1974199479U ES199479Y (es) 1972-12-26 1974-01-14 Un conjunto de imanes de zapatas polares.
US477335A US3885177A (en) 1972-12-26 1974-06-07 Pole-shoe magnet group for a magnetomotive device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00318521A US3828426A (en) 1972-12-26 1972-12-26 Method of fabricating magnetomotive devices

Publications (1)

Publication Number Publication Date
US3828426A true US3828426A (en) 1974-08-13

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ID=23238526

Family Applications (1)

Application Number Title Priority Date Filing Date
US00318521A Expired - Lifetime US3828426A (en) 1972-12-26 1972-12-26 Method of fabricating magnetomotive devices

Country Status (10)

Country Link
US (1) US3828426A (it)
JP (1) JPS52521B2 (it)
AU (1) AU474049B2 (it)
CA (1) CA980408A (it)
DE (1) DE2331951A1 (it)
ES (2) ES414869A1 (it)
FR (1) FR2211732B1 (it)
GB (1) GB1377910A (it)
IT (1) IT985774B (it)
SE (1) SE393494B (it)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899827A (en) * 1973-05-11 1975-08-19 Hitachi Ltd Method of manufacturing pole piece assembly for electromagnetic type pickup
US4482831A (en) * 1982-04-05 1984-11-13 Notaras John Arthur Magneto arrangement
US4792713A (en) * 1987-10-16 1988-12-20 Onan Corporation Lamination to rotor shaft retention method utilizing spring pins
US4934042A (en) * 1987-10-16 1990-06-19 Bush Timothy J Lamination to rotor shaft retention method utilizing spring pins
US20030011263A1 (en) * 2001-07-16 2003-01-16 Masao Iwata Magneto rotor
US20040194286A1 (en) * 2001-08-06 2004-10-07 Mitchell Rose Method of making a ring-magnet assembly
US7936102B2 (en) * 2005-11-29 2011-05-03 Wilic S.Ar.L Magnet holder for permanent magnet rotors of rotating machines

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI122121B (fi) * 2009-05-07 2011-08-31 Abb Oy Järjestely magneetin kiinnittämiseksi roottoriin ja roottori

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2696567A (en) * 1951-06-07 1954-12-07 Briggs & Stratton Corp Rotor for magnetos and method of making the same
US2756356A (en) * 1953-09-16 1956-07-24 Globe Union Inc Field magnet unit for flywheel magnetos
US3132270A (en) * 1959-09-29 1964-05-05 Phelon Co Inc Rotor annulus for electric generator
US3581394A (en) * 1969-05-13 1971-06-01 Russell E Phelon Rotor annulus for electric generator
US3624896A (en) * 1968-06-26 1971-12-07 Dowty Technical Dev Ltd Method of making an electrical moving coil device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1150327A (fr) * 1955-06-03 1958-01-10 Wipac Dev Ltd Perfectionnements apportés aux machines dynamo-électriques

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2696567A (en) * 1951-06-07 1954-12-07 Briggs & Stratton Corp Rotor for magnetos and method of making the same
US2756356A (en) * 1953-09-16 1956-07-24 Globe Union Inc Field magnet unit for flywheel magnetos
US3132270A (en) * 1959-09-29 1964-05-05 Phelon Co Inc Rotor annulus for electric generator
US3624896A (en) * 1968-06-26 1971-12-07 Dowty Technical Dev Ltd Method of making an electrical moving coil device
US3581394A (en) * 1969-05-13 1971-06-01 Russell E Phelon Rotor annulus for electric generator

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899827A (en) * 1973-05-11 1975-08-19 Hitachi Ltd Method of manufacturing pole piece assembly for electromagnetic type pickup
US4482831A (en) * 1982-04-05 1984-11-13 Notaras John Arthur Magneto arrangement
US4792713A (en) * 1987-10-16 1988-12-20 Onan Corporation Lamination to rotor shaft retention method utilizing spring pins
US4934042A (en) * 1987-10-16 1990-06-19 Bush Timothy J Lamination to rotor shaft retention method utilizing spring pins
US20030011263A1 (en) * 2001-07-16 2003-01-16 Masao Iwata Magneto rotor
US6873073B2 (en) * 2001-07-16 2005-03-29 Oppama Industry Co., Ltd. Magneto rotor
US20040194286A1 (en) * 2001-08-06 2004-10-07 Mitchell Rose Method of making a ring-magnet assembly
US7936102B2 (en) * 2005-11-29 2011-05-03 Wilic S.Ar.L Magnet holder for permanent magnet rotors of rotating machines

Also Published As

Publication number Publication date
SE393494B (sv) 1977-05-09
GB1377910A (en) 1974-12-18
AU474049B2 (en) 1976-07-15
ES199479Y (es) 1975-12-16
JPS52521B2 (it) 1977-01-08
FR2211732B1 (it) 1979-05-11
FR2211732A1 (it) 1974-07-19
CA980408A (en) 1975-12-23
AU5474873A (en) 1974-10-24
ES199479U (es) 1975-07-16
IT985774B (it) 1974-12-20
DE2331951A1 (de) 1974-06-27
ES414869A1 (es) 1976-02-01
JPS4996216A (it) 1974-09-12

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