EP0817332A1 - Une méthode de fabrication de commutateurs de machines électriques - Google Patents

Une méthode de fabrication de commutateurs de machines électriques Download PDF

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Publication number
EP0817332A1
EP0817332A1 EP97110639A EP97110639A EP0817332A1 EP 0817332 A1 EP0817332 A1 EP 0817332A1 EP 97110639 A EP97110639 A EP 97110639A EP 97110639 A EP97110639 A EP 97110639A EP 0817332 A1 EP0817332 A1 EP 0817332A1
Authority
EP
European Patent Office
Prior art keywords
segments
ring
strip
commutator
electrically
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.)
Withdrawn
Application number
EP97110639A
Other languages
German (de)
English (en)
Inventor
Egidio Basti
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.)
Denso Manufacturing Italia SpA
Original Assignee
Magneti Marelli Manufacturing SpA
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 Magneti Marelli Manufacturing SpA filed Critical Magneti Marelli Manufacturing SpA
Publication of EP0817332A1 publication Critical patent/EP0817332A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/06—Manufacture of commutators
    • H01R43/08—Manufacture of commutators in which segments are not separated until after assembly

Definitions

  • the present invention relates to a method of manufacturing a commutator for electrical machines.
  • the object of the present invention is to provide a method which can be implemented easily and cheaply and which requires the use of materials which are inexpensive and easily-obtained.
  • the method according to the invention provides for a strip of electrically-conducting material, typically metal, such as copper in particular, as the starting material.
  • This strip can be obtained, for example from a coil, suitably straightened.
  • the strip 1 is subjected to a plastic deformation step (coining) so as to form therein (Figure 2) a plurality of parallel grooves 2 between which a corresponding plurality of equally-spaced transverse segments 3 is defined, the segments being interconnected on a principal face of the strip by thinner integral connecting bridges 4.
  • a loop 5 and a tongue 6 are advantageously formed by an incision step in the top face of each segment 3, projecting from the surface of this face ( Figure 3).
  • the strip 1 is cut into portions each of which includes a number of transverse segments 3 equal to the desired number of bars of the commutator to be produced.
  • Each portion of strip thus produced is then bent so as to form a ring 7 ( Figure 4) with the segments 3 spaced equiangularly.
  • the connecting bridges 4 extend on the periphery of the ring 7 and the loops or hooks 5 and tongues 6 extend radially inwardly of the ring (see also Figure 5).
  • end portions of the segments 3 are bent radially outwardly as can be seen in Figures 6 and 7, possibly after preliminary partial cutting of the connecting bridges 4.
  • the bent ends 3a of the segments 3 of the ring are then cut and opened out so as to form a corresponding plurality of essentially coplanar forks 8.
  • the ring 7 is then incorporated in an electrically-insulating plastics material, for example, by injection moulding.
  • the electrically-insulating material indicated 9 in Figures 10 and 11, extends particularly into the grooves or spaces 2 defined between adjacent segments 3 of the ring.
  • the moulded insulating material, together with the ring 7, forms a monolithic annular structure with a central axial duct 10, the axis of which coincides with the axis of the ring 7 (see Figures 10 and 11).
  • the insulating material is advantageously but not necessarily moulded so as also to fill the spaces defined between adjacent forks 8 of the ring 7 as well as between the prongs of the forks ( Figure 10).
  • the hooks 5 and the tongues 6 of the segments 3 of the ring 7 advantageously act as elements for anchoring the segments firmly in the structure of moulded plastics material.
  • the surface of the ring thus produced is then machined with the removal of material, for example, by turning, to give the ring 11 a perfectly smooth outer surface.
  • this machining also removes the connecting bridges 4 so that, upon completion of the machining, the segments 3 are separated and are electrically-insulated from one another.
  • Recesses 13 are hollowed out in the forks 8, also by further machining with the removal of material (Figure 12), to act as seats for the anchorage of the terminals of the windings of the electrical machine for which the commutator is intended.
  • Figures 12 and 13 thus show the final appearance of the commutator upon completion of the method described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
EP97110639A 1996-07-05 1997-06-30 Une méthode de fabrication de commutateurs de machines électriques Withdrawn EP0817332A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO960580 1996-07-05
IT96TO000580A IT1286155B1 (it) 1996-07-05 1996-07-05 Procedimento per la fabbricazione di un collettore a lamelle per macchine elettriche.

Publications (1)

Publication Number Publication Date
EP0817332A1 true EP0817332A1 (fr) 1998-01-07

Family

ID=11414761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97110639A Withdrawn EP0817332A1 (fr) 1996-07-05 1997-06-30 Une méthode de fabrication de commutateurs de machines électriques

Country Status (2)

Country Link
EP (1) EP0817332A1 (fr)
IT (1) IT1286155B1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1951208U (de) * 1964-04-03 1966-12-08 Bosch Gmbh Robert Rollkommutator fuer elektrische maschinen.
FR2458156A3 (fr) * 1979-05-29 1980-12-26 Dahl Paul Com Fab Collecteur electrique cylindrique notamment pour rotor a grandes vitesses de rotation
US4559464A (en) * 1983-06-27 1985-12-17 General Electric Company Molded commutator and method of manufacture

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1951208U (de) * 1964-04-03 1966-12-08 Bosch Gmbh Robert Rollkommutator fuer elektrische maschinen.
FR2458156A3 (fr) * 1979-05-29 1980-12-26 Dahl Paul Com Fab Collecteur electrique cylindrique notamment pour rotor a grandes vitesses de rotation
US4559464A (en) * 1983-06-27 1985-12-17 General Electric Company Molded commutator and method of manufacture

Also Published As

Publication number Publication date
ITTO960580A0 (fr) 1996-07-05
ITTO960580A1 (it) 1998-01-05
IT1286155B1 (it) 1998-07-07

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