EP0007186A1 - Herstellungsverfahren von Stromwendern sowie gemäss diesen Verfahren hergestellter Stromwender - Google Patents

Herstellungsverfahren von Stromwendern sowie gemäss diesen Verfahren hergestellter Stromwender Download PDF

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Publication number
EP0007186A1
EP0007186A1 EP79301189A EP79301189A EP0007186A1 EP 0007186 A1 EP0007186 A1 EP 0007186A1 EP 79301189 A EP79301189 A EP 79301189A EP 79301189 A EP79301189 A EP 79301189A EP 0007186 A1 EP0007186 A1 EP 0007186A1
Authority
EP
European Patent Office
Prior art keywords
ridges
strip
ring
commutator
channels
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Withdrawn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
EP79301189A
Other languages
English (en)
French (fr)
Inventor
Albert James Gaywood
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.)
QUALTEX INDUSTRIES Ltd
Original Assignee
QUALTEX INDUSTRIES Ltd
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 QUALTEX INDUSTRIES Ltd filed Critical QUALTEX INDUSTRIES Ltd
Publication of EP0007186A1 publication Critical patent/EP0007186A1/de
Withdrawn legal-status Critical Current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

  • This invention relates to methods of manufacturing commutators for electric motors and generators.
  • a commutator consists of a plurality of segments of electrically conductive material and electrically insulating material arranged alternately around the surface of a cylinder. At one time it was normal practice to manufacture a commutator from separate segments of copper and mica. However, it is now more usual, at least in the case of relatively small motors and generators, to produce a ring of electrically conductive material, to embed the ring in insulating material by a moulding process, and thereafter to cut the ring into the required number of segments.
  • the ring is produced from a strip of copper or similar electrically conductive material which is then broached to form a plurality of channels extending parallel to the axis of the ring and facing radially inwards. It is to be understood that, after the ring has been embedded in the electrically insulating material, the bases of the channels are cut away so that the commutator segments are formed by the ridges which remain between the channels.
  • the broaching operation referred to above involves the removal of a considerable amount of copper from the ring and, accordingly, it is an object of the present invention to provide a modified process in which this removal of copper is avoided.
  • the invention consists in a method of manufacturing a commutator for an electric motor or generator from a strip of electrically conductive material having a longitudinally extending marginal portion thinner than the remainder of the strip, including the following steps:-
  • a method in accordance with the invention differs from known methods of manufacturing commutators primarily in that the broaching operation carried out on the copper ring is replaced by an operation carried out on the copper while it is still in the form of a flat strip.
  • the invention consists in a method of manufacturing a commutator for an electric motor or generator, including the step of forming a plurality of parallel transverse channels separated by ridges in a flat strip of electrically conductive material.
  • the channels and ridges are formed by a coining operation .
  • the strip of electrically conductive material is placed in a press provided with a tool having a plurality of parallel ridges separated by channels.
  • the tool causes material in the strip to flow from the regions in contact with the ridges of the tool into the intervening channels of the tool, thus forming said series of parallel channels separated by ridges in the strip.
  • the slots in the marginal portion of the strip are produced by a piercing operation, and the deformation of the ends of the ridges is carried out by a skiving operation.
  • the three steps of coining, piercing and skiving are carried out successively in a multiple press.
  • the blank illustrated in Figure 1 includes a main portion 1, a relatively thin marginal portion 2, and an intermediate portion 3 having a thickness between that of the portions 1 and 2.
  • the blank is cut from a continuous strip of copper which is extruded to the shape shown in Figure 1.
  • the blank illustrated in Figure 1 is subjected to a coining operation in a press provided with a tool having a plurality of parallel ridges separated by channels.
  • the tool causes material in the strip to flow from the regions in contact with the ridges of the tool into the intervening channels of the tool, thus forming a series of parallel channels 4, as shown in Figure 2, separated by upstanding ridges 5.
  • end port ons 6 and 7 ( Figure 3) are trimmed from the blank and slots 8 are formed by a piercing operation in the marginal and intermediate portions 2 and 3 of the blank.
  • This piercing operation forms a plurality of tabs 9, each of which is aligned with a respective one of the ridges 5.
  • the ends of the ridges 5 are deformed by means of a skiving operation.
  • This operation may be a single skiving operation to produce a blank as illustrated in Figures 4 and 4a in which the ends of the ridges are shown bent upwardly at 10 and 11.
  • Altemativefy the operation may be a double skiving operation to produce not only the upturned ends 10 and 11, but also two further curved portions 12 and 13 as shown in Figure 4b.
  • the blank illustrated in Figure 4 is bent by means of a suitable tool to form a ring as shown in Figure 5. It will be seen that the trimmed ends of the blank meet along a line 19.
  • the trimming operation referred to is carried out in such a way that, after the ring has been formed, the spacing between adjacent tabs 9 on each side of the line 19 is identical with the spacing between the remaining tabs 9.
  • the ring is then transferred to a mould in which synthetic resin insulating material is introduced into the interior of the ring as shown at 14 in Figure 6. It will be seen that the ridges 5 and, in particular, the upturned ends 10 and 11 are embedded in the insulating material. Thus these parts form a key to lock the ring to the insulating material 14.
  • the ring is placed in a lathe or similar tool and, if necessary, skimme, to ensure that the outer surface of the ring 16 is coaxial with the axis of rotation which is indicated at 15.
  • the tabs 9 are bent over as shown in Figure 7 to provide terminals for connection of the armature winding when the commutator has been mounted on the armature.
  • slots 17 are cut through the ring between the ridges 5 which are now embedded in the insulating material 14. It will be understood that the slots 17 extend right through the base of the channels 4 so that separate commutator segments 18 are formed by the ridges 5 and the remaining material of the portion 1 below each ridge. It will also be understood that each one of these segments will be integral with a respective one of the tabs 9. Finally, it will be understood that one of the slots 17 will embrace the line 19 between the ends of the trimmed blank.
  • the process described is suitable for production of commutators for relatively small electric motors and generators.
  • a modified form of this process can also be applied to larger commutators.
  • the commutator could be formed from three or more portions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Manufacture Of Motors, Generators (AREA)
EP79301189A 1978-07-07 1979-06-20 Herstellungsverfahren von Stromwendern sowie gemäss diesen Verfahren hergestellter Stromwender Withdrawn EP0007186A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2917378 1978-07-07
GB7829173 1978-07-07

Publications (1)

Publication Number Publication Date
EP0007186A1 true EP0007186A1 (de) 1980-01-23

Family

ID=10498311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79301189A Withdrawn EP0007186A1 (de) 1978-07-07 1979-06-20 Herstellungsverfahren von Stromwendern sowie gemäss diesen Verfahren hergestellter Stromwender

Country Status (2)

Country Link
EP (1) EP0007186A1 (de)
ES (1) ES482126A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019472A2 (de) * 1979-05-18 1980-11-26 FRANKLIN & FREEMAN (LONDON) LIMITED Herstellung von Kommutatorschalen für rotierende elektrische Maschinen
FR2513823A1 (fr) * 1981-09-29 1983-04-01 Kolektor P O Piece semi-finie de collecteur
JP2003009472A (ja) * 2001-06-22 2003-01-10 Asmo Co Ltd 整流子、回転電機の電機子、及び整流子形成用板材の製造方法
DE102005030454A1 (de) * 2005-06-28 2007-01-04 Kolektor Group D.O.O. Leiterrohling für einen Trommelkommutator, Verfahren zur Herstellung eines solchen sowie Trommelkommutator

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH359479A (de) * 1957-08-09 1962-01-15 Bosch Gmbh Robert Rollkollektor für elektrische Maschinen
GB1080652A (en) * 1964-04-03 1967-08-23 Bosch Gmbh Robert Improvements in and relating to commutators
US3492519A (en) * 1967-09-11 1970-01-27 Kirkwood Commutator Corp Commutator and commutator blank for dynamoelectric machines and method of making same
DE1955122A1 (de) * 1969-11-03 1971-05-13 Kautt & Bux Ohg Verfahren zur Herstellung eines Profilbandes fuer die Fertigung von Kommutatoren
US3902241A (en) * 1973-06-06 1975-09-02 Krautt & Bux A G Fa Method of manufacturing pressed material commutators
FR2339277A1 (fr) * 1976-01-20 1977-08-19 Kautt & Bux Kg Collecteur et procede utilise pour sa fabrication

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH359479A (de) * 1957-08-09 1962-01-15 Bosch Gmbh Robert Rollkollektor für elektrische Maschinen
GB1080652A (en) * 1964-04-03 1967-08-23 Bosch Gmbh Robert Improvements in and relating to commutators
US3492519A (en) * 1967-09-11 1970-01-27 Kirkwood Commutator Corp Commutator and commutator blank for dynamoelectric machines and method of making same
DE1955122A1 (de) * 1969-11-03 1971-05-13 Kautt & Bux Ohg Verfahren zur Herstellung eines Profilbandes fuer die Fertigung von Kommutatoren
US3902241A (en) * 1973-06-06 1975-09-02 Krautt & Bux A G Fa Method of manufacturing pressed material commutators
FR2339277A1 (fr) * 1976-01-20 1977-08-19 Kautt & Bux Kg Collecteur et procede utilise pour sa fabrication

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019472A2 (de) * 1979-05-18 1980-11-26 FRANKLIN & FREEMAN (LONDON) LIMITED Herstellung von Kommutatorschalen für rotierende elektrische Maschinen
EP0019472A3 (de) * 1979-05-18 1981-01-07 Franklin & Freeman London Ltd Herstellung von Kommutatorschalen für rotierende elektrische Maschinen.
FR2513823A1 (fr) * 1981-09-29 1983-04-01 Kolektor P O Piece semi-finie de collecteur
JP2003009472A (ja) * 2001-06-22 2003-01-10 Asmo Co Ltd 整流子、回転電機の電機子、及び整流子形成用板材の製造方法
JP4545352B2 (ja) * 2001-06-22 2010-09-15 アスモ株式会社 整流子形成用板材の製造方法
DE102005030454A1 (de) * 2005-06-28 2007-01-04 Kolektor Group D.O.O. Leiterrohling für einen Trommelkommutator, Verfahren zur Herstellung eines solchen sowie Trommelkommutator

Also Published As

Publication number Publication date
ES482126A1 (es) 1980-02-16

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19801029

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GAYWOOD, ALBERT JAMES