US1991046A - Process for making magneto rotors - Google Patents

Process for making magneto rotors Download PDF

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Publication number
US1991046A
US1991046A US676153A US67615333A US1991046A US 1991046 A US1991046 A US 1991046A US 676153 A US676153 A US 676153A US 67615333 A US67615333 A US 67615333A US 1991046 A US1991046 A US 1991046A
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United States
Prior art keywords
rotors
pole wheel
making magneto
sheets
parts
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Expired - Lifetime
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US676153A
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Bohli Jakob
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    • 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

Definitions

  • the subject of the present invention relates to a process of making magneto rotors.
  • Such rotors are fitted out with bundles of sheet iron for preventing eddy-currents.
  • the sheets are mounted to the parts of the electric machines which are to be fitted out therewith, and cast into non-magnetic material, thereby being firmly pressed against the parts of the machine after cooling off of this non-magnetic material.
  • Fig. 1 is a plan view of a pole wheel.
  • Fig. 2 is a plan view of the laminated sheet iron.
  • Fig. 3 is a sectional view of the unit obtained by casting elements of Figs. 1 and 2 together and turning down the periphery.
  • Fig. 4 is a section on line CD of Fig. 3.
  • Fig. 5 is a sectional view of the unit obtained by casting elements of Figs. 1 and 2 together and before the periphery of the sheet iron has been turned down.
  • a represents the pole wheel with the bundle of sheet iron b.
  • c is the non-magnetic material by means of which the sheets b are firmly fixed to the arms 'of the pole wheel.
  • the process consists now generally speaking in that 80 the sheets I) are mounted on the parts, of the electric machines which are to be fitted out therewith and then cast into a non-magnetic material which may be non-magnetic metal or insulating material. In cooling off, this nonmagnetic material contracts and binds the sheets firmly on to the parts of the machine.
  • the sheets are punched out according to Fig. 2 as a continuous ring which is 5 mounted on the pole wheel and then cast into non-magnetic material. This stage of the process is shown in Fig. 6. These rings are turned down in such a way that the laminated sheets on the outside of the pole wheel are no longer 10 connected to one another by metal pieces conducting the magnetic flux.
  • the laminated pole wheel has finally the form as shown by the Figures 3 and 4.
  • a magneto rotor which consists of forming annular, continuous ring laminations having regularly spaced, inwardly extending projections on their internal peripheries, assembling said laminations in stacked 20 formation with their projections in registry and in radial abutting relation to the corresponding polar projections of a pole wheel, uniting the parts thus assembled, by the use of non-magnetic casting material, into an homogeneous, integral :5 rotor wheel, whose parts are held in rigid, intimate assembly by the contraction, due to cool- 7 ing, of the said material, and turning down the external periphery an amount sufllcient to disconnect, magnetically, the spaced, inwardly exso tending projections of the original ring laminations.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Description

Feb. 12, 1935. J. BOHLI 1,991,046
PROCESS FOR MAKING MAGNETO ROTORS Filed June 16, 1933 Patented Feb.12, 1935 UNITED STATES PATENT OFFICE PROCESS FOR MAKING MAGNETO ROTORS Jakob Bohli, Solothurn, Switzerland Application June 16, 1933, Serial No. 676,153
. Germany June 23, 1932 1 Claim.
The subject of the present invention relates to a process of making magneto rotors. Such rotors are fitted out with bundles of sheet iron for preventing eddy-currents.
According to the present invention the sheets are mounted to the parts of the electric machines which are to be fitted out therewith, and cast into non-magnetic material, thereby being firmly pressed against the parts of the machine after cooling off of this non-magnetic material. 0n the drawing a constructional form of the subject of ,this invention is shown, particularly a pole wheel of a magnetic electric machine.
Fig. 1 is a plan view of a pole wheel.
Fig. 2 is a plan view of the laminated sheet iron.
Fig. 3 is a sectional view of the unit obtained by casting elements of Figs. 1 and 2 together and turning down the periphery.
Fig. 4 is a section on line CD of Fig. 3.
Fig. 5 is a sectional view of the unit obtained by casting elements of Figs. 1 and 2 together and before the periphery of the sheet iron has been turned down.
In the figures a represents the pole wheel with the bundle of sheet iron b. c is the non-magnetic material by means of which the sheets b are firmly fixed to the arms 'of the pole wheel. The process consists now generally speaking in that 80 the sheets I) are mounted on the parts, of the electric machines which are to be fitted out therewith and then cast into a non-magnetic material which may be non-magnetic metal or insulating material. In cooling off, this nonmagnetic material contracts and binds the sheets firmly on to the parts of the machine. In the case of a pole wheel the sheets are punched out according to Fig. 2 as a continuous ring which is 5 mounted on the pole wheel and then cast into non-magnetic material. This stage of the process is shown in Fig. 6. These rings are turned down in such a way that the laminated sheets on the outside of the pole wheel are no longer 10 connected to one another by metal pieces conducting the magnetic flux. The laminated pole wheel has finally the form as shown by the Figures 3 and 4.
What I claim is:
The process of building a magneto rotor which consists of forming annular, continuous ring laminations having regularly spaced, inwardly extending projections on their internal peripheries, assembling said laminations in stacked 20 formation with their projections in registry and in radial abutting relation to the corresponding polar projections of a pole wheel, uniting the parts thus assembled, by the use of non-magnetic casting material, into an homogeneous, integral :5 rotor wheel, whose parts are held in rigid, intimate assembly by the contraction, due to cool- 7 ing, of the said material, and turning down the external periphery an amount sufllcient to disconnect, magnetically, the spaced, inwardly exso tending projections of the original ring laminations.
JAKOB BOHLI.
US676153A 1932-06-23 1933-06-16 Process for making magneto rotors Expired - Lifetime US1991046A (en)

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DE1991046X 1932-06-23

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2475776A (en) * 1947-01-11 1949-07-12 Keefe And Merritt Company O Rotor for dynamoelectric machines
US2490021A (en) * 1946-11-21 1949-12-06 Gen Mills Inc Rotor for pancake type induction motors
US2629064A (en) * 1950-12-08 1953-02-17 Lewis William Purcell Commutator and method of forming the same
US2637825A (en) * 1949-03-24 1953-05-05 American Mach & Foundry Dynamoelectric machine
US2655611A (en) * 1951-01-13 1953-10-13 Whizzer Motor Company Alternating current generator
DE764867C (en) * 1936-09-11 1954-08-16 Siemens & Halske A G Permanent magnets and methods of increasing their strength
US2756356A (en) * 1953-09-16 1956-07-24 Globe Union Inc Field magnet unit for flywheel magnetos
US2913819A (en) * 1957-08-26 1959-11-24 American Hardware Corp Powdered metal armature
US2935785A (en) * 1954-11-29 1960-05-10 Globe Ind Inc Method of manufacturing stators
US3077026A (en) * 1959-11-12 1963-02-12 Gen Motors Corp Method of making a permanent magnet rotor
US3573519A (en) * 1969-04-03 1971-04-06 Nippon Denso Co Rotors for alternators
US3628239A (en) * 1968-02-09 1971-12-21 Lucas Industries Ltd Method of making dynamo machines

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE764867C (en) * 1936-09-11 1954-08-16 Siemens & Halske A G Permanent magnets and methods of increasing their strength
US2490021A (en) * 1946-11-21 1949-12-06 Gen Mills Inc Rotor for pancake type induction motors
US2475776A (en) * 1947-01-11 1949-07-12 Keefe And Merritt Company O Rotor for dynamoelectric machines
US2637825A (en) * 1949-03-24 1953-05-05 American Mach & Foundry Dynamoelectric machine
US2629064A (en) * 1950-12-08 1953-02-17 Lewis William Purcell Commutator and method of forming the same
US2655611A (en) * 1951-01-13 1953-10-13 Whizzer Motor Company Alternating current generator
US2756356A (en) * 1953-09-16 1956-07-24 Globe Union Inc Field magnet unit for flywheel magnetos
US2935785A (en) * 1954-11-29 1960-05-10 Globe Ind Inc Method of manufacturing stators
US2913819A (en) * 1957-08-26 1959-11-24 American Hardware Corp Powdered metal armature
US3077026A (en) * 1959-11-12 1963-02-12 Gen Motors Corp Method of making a permanent magnet rotor
US3628239A (en) * 1968-02-09 1971-12-21 Lucas Industries Ltd Method of making dynamo machines
US3573519A (en) * 1969-04-03 1971-04-06 Nippon Denso Co Rotors for alternators

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