US3861028A - Method of producing a magneto rotor - Google Patents

Method of producing a magneto rotor Download PDF

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Publication number
US3861028A
US3861028A US407970A US40797073A US3861028A US 3861028 A US3861028 A US 3861028A US 407970 A US407970 A US 407970A US 40797073 A US40797073 A US 40797073A US 3861028 A US3861028 A US 3861028A
Authority
US
United States
Prior art keywords
pole
pole ring
ring
pole pieces
adhesive
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
US407970A
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English (en)
Inventor
Hermann Mittag
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3861028A publication Critical patent/US3861028A/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
    • 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
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • 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
    • H02K1/2786—Outer rotors
    • H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/279—Magnets embedded in the magnetic 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1089—Methods of surface bonding and/or assembly therefor of discrete laminae to single face of additional lamina
    • 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
    • Y10T29/49076—From comminuted material

Definitions

  • This invention relates to a pole wheel for a magneto generator, particularly for a flywheel-mounted ignition system magneto of an internal combustion engine.
  • a pole wheel herein referred to as a magneto rotor, serves to rotate an array of permanent magnets around the outside of a fixed armature structure.
  • pole ring has magnetized zones which form pole faces at the inner surface of the pole ring, a pole piece of soft magnetic material commonly being applied on the inner surface of the pole ring to form the pole face surface.
  • This type of pole ring is commonly referred to as a plastoferrite magnet or magnet structure.
  • an adhesive is applied to the outer circumferential surface of the pole ring and/or to the inner circumferential surface of the pot-shaped casing bell, the pole ring is placed in position in the casing bell, at this time having an inner diameter somewhat less than the finally desired dimension, and then a pressure plug is introduced inside the pole ring while the assembly is warmed to apply radial outward pressure against the inner surface of the pole faces, pressing the pole ring outwardly against the inner surface of the casing bell and producing a permanent deformation of the pole ring and pole surfaces to their desired final inner dimensions, after which the pressure plug is withdrawn.
  • the manufacturing process of the present invention has the further feature that an adhesive is applied to the inner circumferential surface of the strip-like pole ring and/or the outer or the seating surface of the pole pieces and that the pole pieces are pressed by the pressure plug against the inner circumferential surfaces of the magnetized zones of the pole ring.
  • projections are provided on the inner surface of the casing hell that stick into the pole ring and the pole pieces have hook elements, such as bent edges that extend radially into the pole ring material for a short distance, so that all components of the structure are secured against circumferential relative displacement.
  • FIG. 1 is a cross-section of a magneto rotor of the present invention with the pressure plug used in its manufacture inserted therein, and
  • FIG. 2 is a front view of the same rotor with the pressure plug inserted.
  • FIGS. 1 and 2 show the pole wheel rotor 10 of a flywheel-driven ignition magneto generator.
  • This rotor comprises a pot-shaped casing bell 11 made from a disc of sheet steel by a deep drawing process.
  • a pole ring 12 on the inner circumferential surface of this casing bell 11 is a pole ring 12 in the form of a strip of rectangular crosssection, made of a synthetic material containing embedded magnetizable particles, a so-called plastoferrite material.
  • the north and south poles of the pole ring are formed by magnetized zones 12a, the boundaries of which are shown by dashed lines in FIG. 2.
  • a pole piece 13 is provided, the inner circumferential surface of each of which provides a pole face 13a.
  • the casing bell I1 is also provided with a hub 14 for affixing it to a crankshaft of an internal combustion engine (not shown).
  • a layer of adhesive 15 is applied to the outer surface of the pole ring 12 and/or to the inner circumferential surface of the pot-shaped casing bell 11.
  • an adhesive layer 17 is provided on the inner circumferential surface of the pole ring 12 in the region of the magnetized zones 12a and/or on the outer or seating surfaces of the pole pieces 13.
  • the pole ring 12 is then placed in position in the casing bell 11 and the pole pieces 13 are applied to the inner circumferential surfaces of the magnetized zones 12a. At this stage the minimum inner diameter of the pole structure is somewhat less than the desired final dimension. 7
  • a pressure plug 16 is then inserted into the pole wheel structure 10. As shown in FIG. 2, this pressure plug engages the pole structure along the pole faces with radially extending regions 16a, the outer boundaries of which have the design contour of the inner surface of the pole faces 13a, hence supplying a circumference of somewhat larger diameter than the inner diameter of the pole face circumference prior to the introduction of the pressure plug 16. That means that when the pressure plug 16 is inserted, the pole pieces 13 and with them also the pole ring 12 of plastoferrite material are compressed outwardly against the inner circumferential surface of the casing bell 11, so that the pole ring 12 and the pole pieces 13 are under pressure. The pole wheel rotor 10 along with the pressure plug 16 inside it are now heated.
  • the rotor 10 after the cooling of the rotor that follows and the removal of the pressure plug 16, the rotor 10 has the proper intended value of inner diameter at its pole faces without the necessity of a further machining step.
  • the dimensional tolerances for the components such as the pole pieces 13 and the pole ring 12 may be relatively large, because dimensional variations to which these components may be subject are fully compensated by the deformation of the plastoferrite material of the pole ring 12 produced under the influence of heat.
  • the casing bell 11 and/or the pole pieces 13, however, can be anchored in the plastoferrite material of the pole ring 12 without any supplementary assembly'operations if in the manufacture of the casing bell 11 a number of projections 18, for example in the form of small claws, are provided on its inner circumferential surface and/or if in the manufacture of the pole pieces 13 radially outwardly extending, bent or peeled hooks 19 are provided which will press into the plastoferrite material of the pole ring 12 when the pressure plug 16 is inserted into the structure and will become firmly embedded therein.
  • a number of projections 18, for example in the form of small claws are provided on its inner circumferential surface and/or if in the manufacture of the pole pieces 13 radially outwardly extending, bent or peeled hooks 19 are provided which will press into the plastoferrite material of the pole ring 12 when the pressure plug 16 is inserted into the structure and will become firmly embedded therein.
  • pole wheel rotors can be made that have no pole pieces.
  • the pole ring itself has the pole faces 13a on its inner circumferential surface in the region of the magnetized zones 12a.
  • the pressure plug 16 must in that case be so shaped that the entire inner circumferential surface of the pole ring 12 is compressed to the designed inner diameter dimension, instead of the pressure being applied only to the pole piece surfaces as shown in FIG. 2.
  • the warming up of the rotor structure 10 can take place before the insertion of the pressure plug 16 or simultaneously therewith.
  • the adhesive layers and 17 can, for example, be made of an adhesive cement or by the application of a sheet of adhesive film.
  • a magneto rotor manufactured in this way can also have coarse tolerances for its outer diameter, the individual components of the rotor can be manufactured and assembled largely without machining.
  • the individual components of the rotor can be manufactured and assembled largely without machining.
  • they can be made of zinc plated sheet steel. If bare sheet steel is used, the completely assembled rotor 10 can be coated in a bonderizing bath.
  • a method of making a magneto rotor comprising a pot-shaped magnetically conducting casing bell (11) with a hub (14) for mounting on a drive shaft and a pole ring (12) of synthetic material containing embedded magnetic particles on the inner circumference of said casing bell, which method comprises the steps of: applying an adhesive to at least one of the matched circumferential surfaces respectively of said casing bell and of a pole ring of the aforesaid type having magnetized regions and having an inner diameter slightly smaller than the desired final dimension thereof; placing said pole ring in position in said casing bell on the inner circumfernetial surface thereof; introducing inside said pole ring a pressure plug (16) shaped to the desired final inner dimensions of at least the magnetized regions of said pole ring and thereby exerting an outward radial force while, warming the assembly and permanently deforming said pole ring to its desired final inner dimension; allowing the assembly to cool and said adhesive to harden and thereby to bind said matched surfaces, and thereafter withdrawing said pressure plug.
  • a method as defined in claim 1 which also includes the step of affixing pole pieces (13) to the inner circumferential surface of said pole ring (12), said pole pieces having surfaces matched to the shape of the inner surfaces of the magnetized regions of the said pole ring for mounting thereon, by applying an adhesive to at least one of said matched surfaces respectively of said pole ring (12) and of said pole pieces (13), and in which said pressure plug (16) is shaped to the desired final spacing of inward facing pole face surfaces (l3a) of said pole pieces as finally disposed with respect to each other, so that the introduction of said pressure plug (16) inside said pole ring takes place also inside said pole pieces and serves to exert outward radial force against said pole pieces as well as indirectly against said pole ring, pressing said pole pieces (13) against the inner surface of the magnetized zones of said pole ring (12), after which said adhesive is allowed to harden to secure said pole pieces to said pole ring before said pressure plug is removed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
US407970A 1972-11-11 1973-10-19 Method of producing a magneto rotor Expired - Lifetime US3861028A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2255271A DE2255271C2 (de) 1972-11-11 1972-11-11 Verfahren zur Herstellung eines Polrades für Magnetgeneratoren und danach hergestelltes Polrad

Publications (1)

Publication Number Publication Date
US3861028A true US3861028A (en) 1975-01-21

Family

ID=5861423

Family Applications (1)

Application Number Title Priority Date Filing Date
US407970A Expired - Lifetime US3861028A (en) 1972-11-11 1973-10-19 Method of producing a magneto rotor

Country Status (9)

Country Link
US (1) US3861028A (de)
JP (1) JPS5640588B2 (de)
AT (1) AT326764B (de)
BR (1) BR7308757D0 (de)
DE (1) DE2255271C2 (de)
ES (1) ES420429A1 (de)
FR (1) FR2203208B1 (de)
IT (1) IT999307B (de)
SE (1) SE395803B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093906A (en) * 1975-11-28 1978-06-06 Brunswick Corporation Permanent magnet pulse generator and method of forming and assembly
US4182027A (en) * 1977-03-29 1980-01-08 Novi-P.B. Method of assembling a magneto rotor assembly
WO1998059173A1 (de) * 1997-06-19 1998-12-30 Robert Bosch Gmbh Förderaggregat für kraftstoff
WO1999028631A1 (de) * 1997-11-28 1999-06-10 Robert Bosch Gmbh Förderaggregat für kraftstoff
FR2795509A1 (fr) * 1999-06-23 2000-12-29 Peugeot Citroen Automobiles Sa Dispositif de mesure du debattement lineaire d'un amortisseur de vehicule automobile
US6597079B2 (en) * 2000-09-13 2003-07-22 Sanyo Denki Co., Ltd. Interior permanent magnet synchronous motor
US20040088852A1 (en) * 2002-11-01 2004-05-13 Sanyo Denki Co., Ltd Method of joining rubber magnet to yoke

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5224504U (de) * 1975-08-11 1977-02-21
JPS5725577Y2 (de) * 1975-10-21 1982-06-03
JPS5349006U (de) * 1976-09-29 1978-04-25
JPS5351910U (de) * 1976-10-07 1978-05-02
JPS53118713A (en) * 1977-03-28 1978-10-17 Ina Sankyo Kk Method of fixing magnet body in compact motor
JPS53132610U (de) * 1977-03-28 1978-10-20
JPS53132611U (de) * 1977-03-29 1978-10-20
JPS5473914U (de) * 1977-11-04 1979-05-25
JPS57138853A (en) * 1982-01-14 1982-08-27 Kokusan Denki Co Ltd Manufacture of flywheel magnet rotor
JPS58139664A (ja) * 1982-02-09 1983-08-19 Mitsubishi Electric Corp 磁極固着装置
JPH052191U (ja) * 1991-06-24 1993-01-14 三洋電機株式会社 表示装置
JP2007135379A (ja) * 2005-11-14 2007-05-31 Mitsubishi Electric Corp 磁石発電機
DE102006049866A1 (de) * 2006-10-23 2008-04-30 Siemens Ag Elektrische Maschine mit einem auf einem Rotor fixierten Permanentmagneten

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500090A (en) * 1966-06-28 1970-03-10 Max Baermann Stator unit for an electrodynamic device
US3553509A (en) * 1968-01-26 1971-01-05 Philips Corp Direct-current motor energized by permanent magnets
US3598647A (en) * 1968-10-10 1971-08-10 Allen Bradley Co Adhesive coated ferrite magnets
US3728786A (en) * 1970-11-16 1973-04-24 Crouzet Sa Method of manufacture of a permanent-magnetized rotor for a synchronous motor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE509705A (de) * 1951-03-05
DE6804598U (de) * 1967-11-18 1969-02-27 Flii Pagani S P A Verbesserungen an schwungradzuendmagneten
FR2033663A5 (de) * 1969-02-25 1970-12-04 Jammet Jean
DE2057933A1 (de) * 1970-11-25 1972-06-15 Bosch Gmbh Robert Verfahren zur Herstellung eines Polkerns fuer einen Wechselstromgenerator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500090A (en) * 1966-06-28 1970-03-10 Max Baermann Stator unit for an electrodynamic device
US3553509A (en) * 1968-01-26 1971-01-05 Philips Corp Direct-current motor energized by permanent magnets
US3598647A (en) * 1968-10-10 1971-08-10 Allen Bradley Co Adhesive coated ferrite magnets
US3728786A (en) * 1970-11-16 1973-04-24 Crouzet Sa Method of manufacture of a permanent-magnetized rotor for a synchronous motor

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093906A (en) * 1975-11-28 1978-06-06 Brunswick Corporation Permanent magnet pulse generator and method of forming and assembly
US4182027A (en) * 1977-03-29 1980-01-08 Novi-P.B. Method of assembling a magneto rotor assembly
WO1998059173A1 (de) * 1997-06-19 1998-12-30 Robert Bosch Gmbh Förderaggregat für kraftstoff
WO1999028631A1 (de) * 1997-11-28 1999-06-10 Robert Bosch Gmbh Förderaggregat für kraftstoff
FR2795509A1 (fr) * 1999-06-23 2000-12-29 Peugeot Citroen Automobiles Sa Dispositif de mesure du debattement lineaire d'un amortisseur de vehicule automobile
US6597079B2 (en) * 2000-09-13 2003-07-22 Sanyo Denki Co., Ltd. Interior permanent magnet synchronous motor
US20040017123A1 (en) * 2000-09-13 2004-01-29 Sanyo Denki Co., Ltd. Interior permanent magnet synchronous motor
US20040088852A1 (en) * 2002-11-01 2004-05-13 Sanyo Denki Co., Ltd Method of joining rubber magnet to yoke
US6944929B2 (en) * 2002-11-01 2005-09-20 Sanyo Denki Co., Ltd. Method of joining rubber magnet to yoke

Also Published As

Publication number Publication date
ES420429A1 (es) 1976-04-01
DE2255271C2 (de) 1981-09-24
JPS4974309A (de) 1974-07-18
ATA946673A (de) 1975-03-15
DE2255271A1 (de) 1974-05-22
FR2203208B1 (de) 1976-10-01
BR7308757D0 (pt) 1974-08-29
IT999307B (it) 1976-02-20
SE395803B (sv) 1977-08-22
JPS5640588B2 (de) 1981-09-21
FR2203208A1 (de) 1974-05-10
AT326764B (de) 1975-12-29

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