EP0271973B1 - Une armature - Google Patents

Une armature Download PDF

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Publication number
EP0271973B1
EP0271973B1 EP87306146A EP87306146A EP0271973B1 EP 0271973 B1 EP0271973 B1 EP 0271973B1 EP 87306146 A EP87306146 A EP 87306146A EP 87306146 A EP87306146 A EP 87306146A EP 0271973 B1 EP0271973 B1 EP 0271973B1
Authority
EP
European Patent Office
Prior art keywords
armature
terminal
connector portion
termination
slot
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
EP87306146A
Other languages
German (de)
English (en)
Other versions
EP0271973A1 (fr
Inventor
Roger Frederick Baines
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.)
Johnson Electric SA
Original Assignee
Johnson Electric SA
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
Priority claimed from GB8629624A external-priority patent/GB2198892B/en
Application filed by Johnson Electric SA filed Critical Johnson Electric SA
Priority to EP87306146A priority Critical patent/EP0271973B1/fr
Publication of EP0271973A1 publication Critical patent/EP0271973A1/fr
Application granted granted Critical
Publication of EP0271973B1 publication Critical patent/EP0271973B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/32—Connections of conductor to commutator segment

Definitions

  • This invention relates to an armature for an electrical device and to a method of connecting an armature winding to an armature termination, the armature termination being connectable to an external circuit.
  • an armature comprising a winding having a connector portion coated with insulation, an armature termination, and a support on which said termination is mounted, said termination having an integral terminal provided with a slot which straddles and grips said connector portion, the slot having an open end which faces away from said armature for receiving a connector portion of said armature winding after the armature termination has been mounted on said support and two cutting edges for cutting through the insulation of the connector portion as it is drawn into the slot to establish electrical contact between the connector portion and the terminal, the slot maintaining said electrical contact as it straddles and grips said connector portion.
  • a method of connecting an armature winding to an armature termination comprising the steps of providing the termination with an integral terminal, the terminal having a slot open at one end facing away from the armature and two cutting edges, mounting the termination on a support, and subsequently winding the armature, wherein the winding includes a connector portion coated with insulation and wherein said connector portion is drawn into the slot during winding of the armature so that the cutting edges cut through the insulation of the connector portion and the slot straddles and grips the connector portion to maintain electrical contact between the connector portion and the terminal.
  • Figures 1, 2 and 5 show a unitary plastics moulded termination support 10.
  • the support 10 has three sections, 12, 14 and 16, and is essentially a hollow cylinder with additional structures provided on its external surface, in its middle section 14.
  • the shaft of an armature passes through the support 10 and the portion 16 is a spacer which spaces the middle section 14 of the support 10 from the base of the armature stacks (not shown).
  • the middle portion 14 of the support 10 has five housings 18 equally spaced around the circumferance of the support 10.
  • Section 12 of the support 10 provides support for the commutator segments
  • the housing 18 is best shown in section in figures 2 and 5.
  • the housing 18 has side walls 20, an end wall 22 and a cover 24.
  • the end wall 22 is adjacent the spacer 16 and an opening 26 which faces the commutator support 12 is provided by the walls 20, 22 and cover 24.
  • the side walls 20 are parallel with the longitudinal axis of the support 10.
  • Each side wall 20 of the housing 18 has a slot 30 which extends parallel to the longitudinal axis of the support 10, from the commutator end of the housing 18.
  • a combined commutator segment 34 and terminal 36 are illustrated in figure 3 in the form of a blank.
  • the commutator segment 34 has a base 38 which carries an overlay 40.
  • a lug 42 of reduced width is provided at the front end of the base 38 and the lug 42 has a central struck-up tag 44.
  • Two lugs 42 could be provided, if desired, adjacent opposite edges of the commutator segment 34.
  • the terminal 36 is rectangular with its minor axis coincident with the longitudinal axis of the commutator segment 34.
  • the terminal 36 has two key hole shaped slots 48 extending from opposite ends of the terminal 36 along the major axis thereof.
  • a triangular barb 50 is provided on either side of the minor axis of the terminal 36 along the edge furthest from the commutator segment 34.
  • the base 38 and the overlay 40 of the commutator segment 34 are of arcuate form which conforms to the external radius of the commutator support section 12 of the support 10.
  • the lug 42 extends below the base 38 and back along the length of the commutator section 34 with the tag 44 projecting below the lug 42.
  • Terminal 36 is bent upright from the commutator segment 34 and the arms 52 of the terminal 36, which include the respective key hole shaped slots 48, are bent at 90° to the central portion 54 of the terminal.
  • the arms 52 therefore extend parallel to each other and to the longitudinal axis of the commutator segment 34, and forward along the length thereof.
  • Figure 4 shows one half of the terminal 36 of figure 3, on an enlarged scale. Areas 58 are shown in which bending occurs between the central portion 54 and the arm 52. However, the main purpose of figure 4 is to illustrate the detailed structure of the key hole shaped slots 48. It is this feature which ensures contact with an armature winding portion 32, seen in Figure 5.
  • the tapered mouth 56 provides a funnel for guiding the winding portion 32 into the slot 48.
  • the cutters 62 are formed by a precise stamping operation.
  • the cutters 62 are formed from the arm 52 and partially severed therefrom such that the sharp edges 64 are resiliently urged into the slot 48.
  • Circular end 66 of slot 48 ensures that the edges of the slot 48 have a certain resilience to separation by the winding portion 32.
  • Figure 5 shows shaped commutator segment 34 and the terminal 36 in position on the support 10.
  • the terminal 36 is received in and supported by the housing 18.
  • the barb 50 grips the cover 24 of the housing 18 and therefore retains the terminal 36 within the housing 18. Further retention is provided if the width of the terminal 36 is a close fit to the internal dimensions of the housing 18.
  • the front end of the support 10 is provided with five longitudinal recesses 70 which are cut away at the forward ends so as to meet the curved external surface of the commutator supporting section 12.
  • Lug 42 of commutator segment 34 enters the recess 70 as the terminal 36 enters the housing 18.
  • Tag 44 of lug 42 is forced into the material of the support 10 so as to rigidly restrain the lug 42 within recess 70.
  • Commutator segment 34 is rigidly held in position on the supporting section 12 by interaction of terminal 36 and housing 18 at one end and by interaction of lug 42 and tag 44 with recess 70 at its other end.
  • the commutator segment 34 is rigidly held on supporting section 12 and there is no fear of displacement even during high rotational accelarations.
  • All five commutator segments 34 are mounted on the support 10 in this way.
  • the support 10 together with the commutator segments 34 can then be mounted in a jig and the commutator segments 34 ground down to provide a right cylindrical surface for presentation in use to brush gear.
  • the support 10 is then mounted on an armature shaft (not shown) with the spacer 16 pushed against an armature stack.
  • the armature is then placed in a winding jig and the armature coils wound using, for example, enamel coated copper wire.
  • the lead wire of the armature winding is inserted in the slots 48 and slots 30 in one of the terminals 36 and its respective housing 18.
  • the sharp edges 64 of the cutters 62 sever the insulation on the wire 32 which is deformed as the wire is drawn further into the slots 48, the slots 48 being narrower than the diameter of the wire.
  • the slots 30 terminate short of the ends of slots 48 to prevent the wire 32 from entering the circular ends 66 of the slots 48.
  • the first armature coil is wound.
  • the armature is indexed and the wire 32 is drawn into slots 48 and slots 30 in the next terminal 36 and housing 18 without breaking the continuity of the wire.
  • the winding machine is arranged to do this automatically.
  • the process is repeated until all coils have been wound and the tail end of the winding is drawn into the slots 48 and slots 30 of the first terminal and housing until it is adjacent to the lead end.
  • the wire 32 is then cut and the armature removed from the winding machine.
  • the material of the base 38 of the commutator segment 34 is brass or other metal having similar properties for providing the resilience required for the terminal 36 and lug 42.
  • the overlay is formed of copper which provides the properties necessary for its commutation function. In operation the overlay 40 will be directly contacted by the brushes of the electric motor.
  • the invention provides a simple and cheap connection between the armature winding and the commutator. No application of heat is required and the associated risk of distorting the support 10 is therefore avoided. No embrittlement of the winding wire is caused and problems associated with oxidation are also avoided. The use of flux is negated and there is no chemical reaction or consequent corrosion resulting from the connection.
  • the housings 18 are by no means essential, although some support for the terminal 36 is necessary. If the housings 18 are omitted either the circular ends 66 of the slots 48 must be omitted or some means must be provided to prevent the wire 32 from entering these circular ends 66.
  • the terminal 36 may be designed with only one arm 52.
  • the commutator segments 34 need not be bimetallic.
  • the commutator segments could be bonded to the commutator support section 12 and the spacer 16 may include formations co-operating with complementary formations on the winding stacks, so as to prevent angular displacement between the support 10 and the armature stacks.
  • the wire of the armature may be formed of a material such as aluminium instead of copper and various sizes of wire can be accommodated.
  • the support 10 could be of metal, e.g. aluminium, provided with an insulating layer of metal oxide.
  • the edges of the slots 48 could be serrated.
  • the commutator may be a face commutator with the commutator segments arranged in a single plane perpendicular to the axis of the armature.
  • armature terminations could be in the form of slip rings rather than commutator segments.

Claims (7)

  1. Induit comprenant un enroulement possédant une portion de connecteur (32) revêtue d'un isolant, une terminaison d'induit (34) et un support (10) sur lequel est montée ladite terminaison, ladite terminaison (34) comportant une borne solidaire (36) dans laquelle est pratiquée une rainure (48) qui chevauche et saisit ladite portion de connecteur (32), la rainure (48) comportant une extrémité ouverte dont l'orientation se détourne de ladite induit, dans laquelle vient se loger une portion de connecteur (32) dudit enroulement après que la terminaison d'induit (34) a été montée sur ledit support (10), ainsi que deux bords coupants (64) pour inciser l'isolant de la portion de connecteur (32) à mesure où elle est tirée dans la rainure (48) pour établir un contact électrique entre la portion de connecteur (32) et la borne (36), la rainure (48) maintenant ledit contact électrique en chevauchant et en saisissant ladite portion de connecteur (32).
  2. Induit selon la revendication 1, dans laquelle ladite borne (36) comporte au moins deux bras parallèles (52) munis chacun d'une rainure (48) qui chevauche et saisit ladite portion de connecteur (32).
  3. Induit selon la revendication 2, dans laquelle lesdits deux bras (52) sont reliés par une portion transversale (54).
  4. Induit selon l'une quelconque des revendications précédentes, dans laquelle le support (10) englobe un logement (18) pour ladite borne (36).
  5. Induit selon la revendication 4, dans laquelle ladite borne (36) est équipée d'une barbe (50) pour retenir ladite borne dans ledit logement (18).
  6. Induit selon l'une quelconque des revendications précédentes, dans laquelle il y a trois terminaisons d'induit ou plus sous la forme de segments de commutateur (34) fixés audit support (10).
  7. Procédé de raccordement d'un enroulement d'induit à une terminaison d'induit (34), la terminaison d'induit (34) pouvant être raccordée à un circuit externe, comprenant les étapes consistant à : munir la terminaison (34) d'une borne solidaire (36), la borne comportant une rainure (48) ouverte à une extrémité dont l'orientation se détourne de l'induit et deux bords coupants (64); monter la terminaison (34) sur un support (10); et ensuite, bobiner l'induit; procédé dans lequel l'enroulement englobe une portion de connecteur (32) revêtue d'un isolant et dans lequel ladite portion de connecteur (32) est tirée dans la rainure (48) au cours du bobinage de l'induit, si bien que les bords coupants (64) pratiquent une incision dans l'isolant de la portion de connecteur (32) et la rainure (48) chevauche et saisit le portion de connecteur (32) pour maintenir un contact électrique entre la portion de connecteur (32) et la borne.
EP87306146A 1986-12-11 1987-07-10 Une armature Expired - Lifetime EP0271973B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP87306146A EP0271973B1 (fr) 1986-12-11 1987-07-10 Une armature

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB8629624 1986-12-11
GB8629624A GB2198892B (en) 1986-12-11 1986-12-11 Armature winding connections.
EP87306146A EP0271973B1 (fr) 1986-12-11 1987-07-10 Une armature

Publications (2)

Publication Number Publication Date
EP0271973A1 EP0271973A1 (fr) 1988-06-22
EP0271973B1 true EP0271973B1 (fr) 1993-04-07

Family

ID=26110557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87306146A Expired - Lifetime EP0271973B1 (fr) 1986-12-11 1987-07-10 Une armature

Country Status (1)

Country Link
EP (1) EP0271973B1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128818B (en) * 1982-10-11 1986-02-12 Johnson Electric Ind Mfg An armature
JPS59107574U (ja) * 1982-12-29 1984-07-19 マブチモ−タ−株式会社 小型モ−タの整流子装置

Also Published As

Publication number Publication date
EP0271973A1 (fr) 1988-06-22

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