EP0448564A1 - Commutator for electrical machines - Google Patents

Commutator for electrical machines

Info

Publication number
EP0448564A1
EP0448564A1 EP19890912225 EP89912225A EP0448564A1 EP 0448564 A1 EP0448564 A1 EP 0448564A1 EP 19890912225 EP19890912225 EP 19890912225 EP 89912225 A EP89912225 A EP 89912225A EP 0448564 A1 EP0448564 A1 EP 0448564A1
Authority
EP
European Patent Office
Prior art keywords
segments
longitudinal grooves
segment carrier
segment
carrier
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Withdrawn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
EP19890912225
Other languages
German (de)
French (fr)
Inventor
Martin Schwerdtle
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
Publication of EP0448564A1 publication Critical patent/EP0448564A1/en
Withdrawn legal-status Critical Current

Links

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

Definitions

  • the invention is based on a commutator for electrical machines according to the preamble of the main claim.
  • the carrier body consists of steel and has a cylindrical outer jacket on which an insulating cylinder is attached. Segments and insulating rods are alternately arranged on the insulating cylinder to form an equally cylindrical outer jacket - and thus the brush running surface of the commutator - and connected to one another by soldering or welding.
  • the disadvantage here is that the manufacturing process is very cumbersome and expensive and can not be sufficiently centrifugal and temperature resistant.
  • the invention is based on the object of producing a commutator suitable for large-scale production for high-speed electrical machines in short process times with high spin resistance and high temperature resistance.
  • the measures specified in the characterizing part of the main claim are provided to achieve the object.
  • the advantage here is that the elimination of asbestos-containing insulating material and the associated long manufacturing process time means that more environmentally friendly commutators with sufficiently high spin resistance can be produced in a process suitable for large-scale production with short cycle times, and moreover assembly of the commutators in an automated armature production junction road is made possible. It is also advantageous that a higher temperature resistance and better heat dissipation is achieved by the elimination of the usual known insulating material, which mostly contains asbestos, and there is no need to remove the insulation between the segments.
  • FIG. 1 shows a commutator in longitudinal section
  • FIG. 2 shows a first exemplary embodiment
  • FIG. 3 shows a second exemplary embodiment of a part of the segment carrier with segments inserted and fastened in the longitudinal grooves, each in the direction of the arrow in FIG. 1.
  • a commutator has a segment carrier 1, for example made of steel or aluminum, which is provided with a concentric bore 2 2 for receiving it on an armature shaft which is known per se and not shown in detail.
  • the segment carrier 1 On its outer jacket 3, the segment carrier 1 is provided with longitudinal grooves 4 evenly distributed in the U direction of travel.
  • an insulating layer 5 is applied, for example made of paper, lacquer or as a powder coating.
  • the side walls 6 of the open longitudinal grooves 4 are flat.
  • the segments 7 have at one end a connecting lug 8 for fastening the ends of an armature winding which is known per se and not shown in detail.
  • the fastening area 9 of the segments 7 in the longitudinal grooves 4 of the segment carrier 1 is narrowed in cross section in a wedge shape with a rounded edge.
  • the shape of the fastening area 9 of the segments 7 thus corresponds to the shape of the longitudinal groove 4 of the segment carrier 1.
  • a longitudinal groove 11 is formed in each of the longitudinal sides 10 of the fastening area 9, which forms an undercut as seen from the brush tread 12 of the segments 7.
  • the segments 7 with their fastening areas 9 to 11 are inserted radially or axially into the longitudinal grooves 4 of the segment carrier 1 and mechanically fastened in the segment carrier 1. This is done, for example, by caulking. Material is pressed at least in places from the outer jacket 3 between the longitudinal grooves 4 of the segment carrier 1 into the longitudinal grooves 11 in the fastening area 9 of the segments 7.
  • the segments 7 can also be caulked from "inside". For this purpose, for example, the commutator is clamped into a die and the segment carrier 1 equipped with the segments 7 is axially collapsed. presses, so that displaced material of the segment carrier 1 can dodge into the longitudinal grooves 11 of the segments 7 and holds the segments 7 in the segment carrier 1.
  • the edge sections 14 of the side walls 15 are formed so as to protrude into the longitudinal grooves 15 at the open end of the longitudinal grooves 16 of the segment carrier 13.
  • the edge sections 14 are formed corresponding to the longitudinal grooves 11 in the fastening area 9 of the segments 7 and also form undercuts when viewed from the outer jacket 3 of the segment carrier 13.
  • the segments 7 are inserted with their fastening area 9 axially into the longitudinal grooves 16 of the segment carrier 13, the edge sections 14 engaging in the longitudinal grooves 11 of the segments 7.
  • the segments 7 are already held on the segment carrier 13.
  • the segments 7 are additionally fastened to the segment carrier 13, for example by caulking.
  • the segments 7 can be caulked from "inside" as in the first embodiment. Above all, this increases the skid resistance.
  • the assembly of the commutators can be carried out with simple means in short cycle times in an automated armature production line in both versions and is therefore carried out economically, particularly in large-volume production.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

Commutateur pour machines électriques comportant un support de lames (1) en un matériau électroconducteur et des rainures longitudinales (4) sur son enveloppe extérieure (3). Les lames (7) sont placées dans ces rainures longitudinales, une couche d'isolation (5) les séparant, et elles y sont fixées mécaniquement dans des rainures longitudinales (11) prévues dans la région de fixation (9) des lames (7), du matériau de l'enveloppe extérieure (3) du support de lames (1) étant repoussé. Grâce à ce moyen simple, on obtient des commutateurs sans amiante, très résistants aux forces centrifuges et peu sensibles à la température.Switch for electric machines comprising a blade support (1) made of an electrically conductive material and longitudinal grooves (4) on its outer casing (3). The blades (7) are placed in these longitudinal grooves, an insulating layer (5) separating them, and they are fixed there mechanically in longitudinal grooves (11) provided in the region of attachment (9) of the blades (7). , material of the outer casing (3) of the blade support (1) being pushed back. Thanks to this simple means, asbestos-free switches are obtained, very resistant to centrifugal forces and not very sensitive to temperature.

Description

Kommutator für elektrische MaschinenCommutator for electrical machines
Stand der TechnikState of the art
Die Erfindung geht von einem Kommutator für elektrische Maschinen nach der Gattung des Hauptanspruchs aus. Bei solch einem bekannten Kommutator besteht der Trägerkörper aus Stahl und hat einen zylin¬ drischen Außenmantel, auf dem ein Isolierzylinder befestigt ist. Auf dem Isolierzylinder sind einen gleichfalls zylindrischen Außen¬ mantel - und somit die Bürstenlauffläche des Kommutators - bildend abwechselnd Segmente und Isolierstäbe angeordnet und durch Löten oder Schweißen miteinander verbunden. Dabei ist von Nachteil, daß das Herstellverfahren sehr umständlich und teuer ist und nicht in ausreichendem Maße schleuderfest und temperaturbeständig sein kann.The invention is based on a commutator for electrical machines according to the preamble of the main claim. In such a known commutator, the carrier body consists of steel and has a cylindrical outer jacket on which an insulating cylinder is attached. Segments and insulating rods are alternately arranged on the insulating cylinder to form an equally cylindrical outer jacket - and thus the brush running surface of the commutator - and connected to one another by soldering or welding. The disadvantage here is that the manufacturing process is very cumbersome and expensive and can not be sufficiently centrifugal and temperature resistant.
Aufgabe, Lösung und Vorteile der ErfindungObject, solution and advantages of the invention
Der Erfindung liegt die Aufgabe zugrunde, einen für die Großmengen- fertigung geeigneten Kommutator für hochdrehende elektrische Maschinen in kurzen Prozeßzeiten mit hoher Schleuderfestigkeit und hoher Temperaturbeständigkeit herzustellen. Zur Lösung der Aufgabe sind die im Kennzeichen des Hauptanspruchs angegebenen Maßnahmen vorgesehen.The invention is based on the object of producing a commutator suitable for large-scale production for high-speed electrical machines in short process times with high spin resistance and high temperature resistance. The measures specified in the characterizing part of the main claim are provided to achieve the object.
Dabei ist von Vorteil, daß durch das Entfallen von asbesthaltiger Isolierstoffmasse und damit verbundener langer Herstellprozeßzeit umweltfreundlichere Kommutatoren mit ausreichend hoher Schleuder¬ festigkeit in einem für die Großmengenfertigung geeigneten Verfahren mit kurzen Taktzeiten hergestellt werden können und darüber hinaus eine Montage der Kommutatoren in einer automatisierten Ankerferti¬ gungsstraße ermöglicht wird. Außerdem ist von Vorteil, daß durch den Wegfall der üblichen bekannten meist Asbest enthaltenden Isolier¬ stoffmasse eine höhere Temperaturbeständigkeit und bessere Wärmeab¬ leitung erzielt wird und das Entfernen der Isolation zwischen den Segmenten entfällt.The advantage here is that the elimination of asbestos-containing insulating material and the associated long manufacturing process time means that more environmentally friendly commutators with sufficiently high spin resistance can be produced in a process suitable for large-scale production with short cycle times, and moreover assembly of the commutators in an automated armature production junction road is made possible. It is also advantageous that a higher temperature resistance and better heat dissipation is achieved by the elimination of the usual known insulating material, which mostly contains asbestos, and there is no need to remove the insulation between the segments.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Hauptanspruch angegebenen Kommutators möglich. Besonders vorteilhaft ist die weiter erhöhte Schleuderfestigkeit durch das Verstemmen der radial und/oder axial in die Längsnuten des Segmentträgers einsetzbaren Segmente.Advantageous further developments of the commutator specified in the main claim are possible through the measures listed in the subclaims. The further increased spin resistance is particularly advantageous due to the caulking of the segments which can be inserted radially and / or axially into the longitudinal grooves of the segment carrier.
Zeichnungdrawing
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen Kommutator im Längsschnitt, Figur 2 ein erstes Aus¬ führungsbeispiel und Figur 3 ein zweites Ausführungsbeispiel eines Teiles des .Segmentträgers mit in den Längsnuten eingesetzten und befestigten Segmenten, jeweils in Ansicht in Pfeilrichtung in Figur 1. Beschreibung der AusführungsbeispieleEmbodiments of the invention are shown in the drawing and explained in more detail in the following description. FIG. 1 shows a commutator in longitudinal section, FIG. 2 shows a first exemplary embodiment and FIG. 3 shows a second exemplary embodiment of a part of the segment carrier with segments inserted and fastened in the longitudinal grooves, each in the direction of the arrow in FIG. 1. Description of the embodiments
Ein Kommutator hat einen Segmentträger 1 beispielsweise aus Stahl oder Aluminium, der mit einer konzentrischen Bohrung 2 2um Aufnehmen auf einer an sich bekannten und nicht näher dargestellten Ankerwelle versehen ist. An seinem Außenmantel 3 ist der Segmentträger 1 mit in U fangsrichtung gleichmäßig verteilten Längsnuten 4 versehen. Auf dem Außenmantel 3 einschließlich der Längsnuten 4 ist eine Isolier¬ schicht 5 aufgebracht beispielsweise aus Papier, Lack oder als Pulverbeschichtung.A commutator has a segment carrier 1, for example made of steel or aluminum, which is provided with a concentric bore 2 2 for receiving it on an armature shaft which is known per se and not shown in detail. On its outer jacket 3, the segment carrier 1 is provided with longitudinal grooves 4 evenly distributed in the U direction of travel. On the outer jacket 3 including the longitudinal grooves 4, an insulating layer 5 is applied, for example made of paper, lacquer or as a powder coating.
Beim ersten Ausführungsbeispiel des Segmentträgers 1 nach Figur 2 sind die Seitenwände 6 der offenen Längsnuten 4 eben ausgebildet. Die Segmente 7 haben an einem Ende eine Anschlußfahne 8 zum Befestigen der Enden einer an sich bekannten und nicht näher dargestellten Ankerwicklung. Der Befestigungsbereich 9 der Segmente 7 in den Längsnuten 4 des Segmentträgers 1 ist im Querschnitt keilförmig verengt mit abgerundeter Kante. Die Form des Befestigungsbereichs 9 der Segmente 7 entspricht somit der Form der Längsnut 4 des Segmentträgers 1. In den Längsseiten 10 des Befestigungsbereichs 9 ist je eine Längsnut 11 ausgebildet, die von der Bürstenlauffläche 12 der Segmente 7 her gesehen einen Hinter¬ schnitt bildet.In the first embodiment of the segment carrier 1 according to FIG. 2, the side walls 6 of the open longitudinal grooves 4 are flat. The segments 7 have at one end a connecting lug 8 for fastening the ends of an armature winding which is known per se and not shown in detail. The fastening area 9 of the segments 7 in the longitudinal grooves 4 of the segment carrier 1 is narrowed in cross section in a wedge shape with a rounded edge. The shape of the fastening area 9 of the segments 7 thus corresponds to the shape of the longitudinal groove 4 of the segment carrier 1. A longitudinal groove 11 is formed in each of the longitudinal sides 10 of the fastening area 9, which forms an undercut as seen from the brush tread 12 of the segments 7.
Die Segmente 7 werden mit ihrem Befestigungsbereich 9 bis 11 radial oder axial in die Längsnuten 4 des Segmentträgers 1 eingesetzt und im Segmentträger 1 mechanisch befestigt. Das geschieht beispiels¬ weise durch Verstemmen. Dabei wird wenigstens stellenweise Material vom Außenmantel 3 zwischen den Längsnuten 4 des Segmentträgers 1 in die Längsnuten 11 im Befestigungsbereich 9 der Segmente 7 gepreßt. Die Segmente 7 können auch von "innen" verstemmt werden. Dazu wird beispielsweise der Kommutator in eine Matrize gespannt und der mit den Segmenten 7 bestückte Segmentträger 1 wird axial zusammenge- drückt, so daß dabei verdrängtes Material des Segmentträgers 1 in die Längsnuten 11 der Segmente 7 ausweichen kann und die Segmente 7 im Segmentträger 1 festhält.The segments 7 with their fastening areas 9 to 11 are inserted radially or axially into the longitudinal grooves 4 of the segment carrier 1 and mechanically fastened in the segment carrier 1. This is done, for example, by caulking. Material is pressed at least in places from the outer jacket 3 between the longitudinal grooves 4 of the segment carrier 1 into the longitudinal grooves 11 in the fastening area 9 of the segments 7. The segments 7 can also be caulked from "inside". For this purpose, for example, the commutator is clamped into a die and the segment carrier 1 equipped with the segments 7 is axially collapsed. presses, so that displaced material of the segment carrier 1 can dodge into the longitudinal grooves 11 of the segments 7 and holds the segments 7 in the segment carrier 1.
Beim zweiten Ausführungsbeispiel des Segmentträgers 13 sind die Randabschnitte 14 der Seitenwände 15 am offenen Ende der Längsnuten 16 des Segmentträgers 13 in die Längsnuten 15 hineinragend ausge¬ bildet. Die Randabschnitte 14 sind entsprechend den Längsnuten 11 im Befestigungsbereich 9 der Segmente 7 ausgebildet und bilden vom Außenmantel 3 des Segmentträgers 13 gesehen ebenfalls Hinterschnitte.In the second exemplary embodiment of the segment carrier 13, the edge sections 14 of the side walls 15 are formed so as to protrude into the longitudinal grooves 15 at the open end of the longitudinal grooves 16 of the segment carrier 13. The edge sections 14 are formed corresponding to the longitudinal grooves 11 in the fastening area 9 of the segments 7 and also form undercuts when viewed from the outer jacket 3 of the segment carrier 13.
Die Segmente 7 werden mit ihrem Befestigungsbereich 9 axial in die L ngsnuten 16 des Segmentträgers 13 eingesetzt, wobei die Randab¬ schnitte 14 in die Längsnuten 11 der Segmente 7 greifen. Dadurch sind die Segmente 7 bereits am Segmentträger 13 gehalten. Durch Verdrängen von Material vom Außenmantel 3 zwischen den Längsnuten 16 des Segmentträgers 13 in die Längsnuten 11 im Befestigungsbereich 9 der Segmente 7 werden die Segmente 7 - beispielsweise durch Ver- stemmen - noch zusätzlich am Segmentträger 13 befestigt. Desgleichen können die Segmente 7 wie beim ersten Ausführungsbeispiel von "innen" verstemmt werden. Dadurch wird vor allem die Schleuder¬ festigkeit weiter erhöht.The segments 7 are inserted with their fastening area 9 axially into the longitudinal grooves 16 of the segment carrier 13, the edge sections 14 engaging in the longitudinal grooves 11 of the segments 7. As a result, the segments 7 are already held on the segment carrier 13. By displacing material from the outer jacket 3 between the longitudinal grooves 16 of the segment carrier 13 into the longitudinal grooves 11 in the fastening area 9 of the segments 7, the segments 7 are additionally fastened to the segment carrier 13, for example by caulking. Similarly, the segments 7 can be caulked from "inside" as in the first embodiment. Above all, this increases the skid resistance.
Die Montage der Kommutatoren läßt sich bei beiden Ausführungen mit einfachen Mitteln in kurzen Taktzeiten in einer automatisierten Ankerfertigungsstraße durchführen und erfolgt somit besonders in der Großmengenfertigung in wirtschaftlicher Weise. The assembly of the commutators can be carried out with simple means in short cycle times in an automated armature production line in both versions and is therefore carried out economically, particularly in large-volume production.

Claims

Ansprüche Expectations
1. Kommutator für elektrische Maschinen mit einer Vielzahl von Segmenten, welche an einem Segmentträger aus elektrisch leitendem Werkstoff unter Zwischenlage einer Isolierung befestigt sind, dadurch gekennzeichnet, daß auf dem Außenmantel (3) des Segment¬ trägers (1; 13) samt den darin ausgebildeten Längsnuten (4; 16), in welchen die Segmente (7) angeordnet und befestigt sind, oder auf dem in den Längsnuten (4; 16) aufgenommenen Befestigungsbereich (9) der Segmente (7) eine Isolierschicht (5) aufgebracht ist und die in den Längsnuten (4; 16) eingesetzten Segmente (7) am Segmentträger (1; 13) mechanisch befestigt sind.1. Commutator for electrical machines with a plurality of segments which are fastened to a segment carrier made of electrically conductive material with the interposition of insulation, characterized in that on the outer jacket (3) of the segment carrier (1; 13) together with those formed therein Longitudinal grooves (4; 16), in which the segments (7) are arranged and fastened, or on the fastening area (9) of the segments (7) accommodated in the longitudinal grooves (4; 16) an insulating layer (5) is applied and which in the longitudinal grooves (4; 16) inserted segments (7) on the segment carrier (1; 13) are mechanically fastened.
2. Kommutator nach Anspruch 1, dadurch gekennzeichnet, daß die Segmente (7) an den Längsseiten (10) ihres Befestigungsbereiches (9) mit mindestens je einer Längsnut (11) versehen sind, in welche zum mechanischen Befestigen der Segmente (7) am Segmentträger (1; 13) verdrängbares Material aufgenommen ist.2. Commutator according to claim 1, characterized in that the segments (7) on the long sides (10) of their fastening area (9) are each provided with at least one longitudinal groove (11) in which for mechanically fastening the segments (7) to the segment carrier (1; 13) displaceable material is added.
3. Kommutator nach Anspruch 1, dadurch gekennzeichnet, daß die Segmente (7) an den Längsseiten (10) ihres Befestigungsbereiches (9) mit mindestens je einer Längsnut (11) versehen sind, in welche sich an den Seitenwänden (15) der Längsnuten (16) des Segmentträgers (13) ausgebildete und in die Längsnuten (16) ragende Vorsprünge (14) erstrecken und in denen zusätzlich am Segmentträger (13) verdräng¬ bares Material aufgenommen ist.3. Commutator according to claim 1, characterized in that the segments (7) on the longitudinal sides (10) of their fastening area (9) are each provided with at least one longitudinal groove (11) into which there are on the side walls (15) of the longitudinal grooves ( 16) of the segment carrier (13) trained projections (14) projecting into the longitudinal grooves (16) and in which additionally displaceable material is received on the segment carrier (13).
4. Kommutator nach einem der Ansprüche 1 bis 3, dadurch gekenn¬ zeichnet, daß die Segmente (7) in den Längsnuten (4; 16) des Segmentträgers (1; 13) mittels Verstemmen des vom Außenmantel (3) des Segmentträgers (1; 13) verdrängbaren Materials mechanisch befestigt sind.4. Commutator according to one of claims 1 to 3, characterized gekenn¬ characterized in that the segments (7) in the longitudinal grooves (4; 16) of the segment carrier (1; 13) by caulking of the outer jacket (3) of the segment carrier (1; 13) displaceable material are mechanically attached.
5. Kommutator nach einem der Ansprüche 1 bis 3, dadurch gekennzeich¬ net, daß die Segmente (7) in den Längsnuten (4; 16) des Segment¬ trägers (1; 13) mittels beim axialen Zusammendrücken des Segment¬ trägers (1; 13) verdrängbarem Material mechanisch befestigt sind. 5. Commutator according to one of claims 1 to 3, characterized gekennzeich¬ net that the segments (7) in the longitudinal grooves (4; 16) of the Segment¬ carrier (1; 13) by means of the axial compression of the Segment¬ carrier (1; 13) displaceable material are mechanically attached.
EP19890912225 1988-12-17 1989-11-16 Commutator for electrical machines Withdrawn EP0448564A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3842564 1988-12-17
DE19883842564 DE3842564A1 (en) 1988-12-17 1988-12-17 COMMUTATOR FOR ELECTRICAL MACHINES

Publications (1)

Publication Number Publication Date
EP0448564A1 true EP0448564A1 (en) 1991-10-02

Family

ID=6369427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890912225 Withdrawn EP0448564A1 (en) 1988-12-17 1989-11-16 Commutator for electrical machines

Country Status (7)

Country Link
EP (1) EP0448564A1 (en)
JP (1) JPH04503748A (en)
AU (1) AU620469B2 (en)
BR (1) BR8907827A (en)
DE (1) DE3842564A1 (en)
ES (1) ES2017893A6 (en)
WO (1) WO1990007210A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4302853C1 (en) * 1993-02-02 1994-02-03 Bosch Gmbh Robert Mfg. electrical machine commutator - placing tubular profile laminations between radially projecting ribs wound outside carrier fitted to machine shaft
WO1995014319A1 (en) * 1993-11-15 1995-05-26 Kautt & Bux Commutator Gmbh Commutator and method of manufacturing it
DE102011083901B4 (en) * 2011-09-30 2022-10-13 Seg Automotive Germany Gmbh Commutator for an electrical machine, electrical machine and method for producing a commutator
US9615728B2 (en) 2012-06-27 2017-04-11 Camplex, Inc. Surgical visualization system with camera tracking
US11154378B2 (en) 2015-03-25 2021-10-26 Camplex, Inc. Surgical visualization systems and displays

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486875A (en) * 1945-10-30 1949-11-01 Gen Electric Commutator for dynamoelectric machines and method of making the same
GB795825A (en) * 1955-08-08 1958-05-28 Napier & Son Ltd Electrical commutators

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9007210A1 *

Also Published As

Publication number Publication date
DE3842564A1 (en) 1990-06-21
AU620469B2 (en) 1992-02-20
ES2017893A6 (en) 1991-03-01
BR8907827A (en) 1991-10-01
JPH04503748A (en) 1992-07-02
WO1990007210A1 (en) 1990-06-28
AU4496689A (en) 1990-07-10

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