EP0759652A1 - Kollektor - Google Patents

Kollektor Download PDF

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Publication number
EP0759652A1
EP0759652A1 EP96305846A EP96305846A EP0759652A1 EP 0759652 A1 EP0759652 A1 EP 0759652A1 EP 96305846 A EP96305846 A EP 96305846A EP 96305846 A EP96305846 A EP 96305846A EP 0759652 A1 EP0759652 A1 EP 0759652A1
Authority
EP
European Patent Office
Prior art keywords
base
commutator
segments
bonding material
projections
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Withdrawn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
EP96305846A
Other languages
English (en)
French (fr)
Inventor
Patrick Shui-Chung Wang
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
Application filed by Johnson Electric SA filed Critical Johnson Electric SA
Publication of EP0759652A1 publication Critical patent/EP0759652A1/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Withdrawn legal-status Critical Current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
    • 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
    • H01R39/04—Commutators

Definitions

  • This invention relates to assembled commutators, particularly of the type shown in GB 223 889A.
  • Commutators for fractional horsepower motors are generally of two types, moulded or assembled. Moulded commutators are superior in fixing of the segments to the commutator base as the base is moulded directly to the segments but this process is difficult and thus, slow and expensive. Assembled commutators are cheaper but have a problem of how to reliably secure the segments to the preformed base.
  • Assembled commutators such as those shown in GB 223889A have addressed this problem by using commutator segments with fixing means or limbs in the form of fingers and loops for mating with recesses and projections formed on the base to secure the segments.
  • the loops are placed over the projections and the fingers are plastically deformed into the recesses to secure the segments to the base.
  • the present invention provides an assembled commutator having a preformed base; a plurality of segments fitted to the base; and bonding material wherein, each segment has a brush contact portion for making sliding contact with a brush, a terminal for making electrical contact with an armature winding, and fixing means extending from the brush contact portion and formlocked with the base to fix the segment to the base, and the bonding material at least partially covers the fixing means to bond the segments to the base.
  • the base is cylindrical with first and second axial ends and fixing means include fingers plastically deformed into at least one recess formed in the first axial end of the base.
  • the fixing means further includes a limb extending from the brush contact portion and engaging detent means formed on the second axial end of the base for fixing the segment to the base.
  • the detent means comprises a plurality of axially extending projections and the limb forms a loop through which the projections extend.
  • the base has an annular groove formed in the second axial end adjacent the root of the projections and the limbs extend into the groove, the groove forming a reservoir for further bonding material bonding the limbs to the base.
  • the present invention provides a wound rotor for an electric motor comprising a shaft; an armature core mounted on the shaft for rotation therewith; armature windings wound around the armature core; a commutator mounted on the shaft adjacent the armature core, the commutator having a preformed base and a plurality of segments fitted to the base, each segment having a brush contact portion for making sliding contact with a brush connected to a source of electrical power, a terminal electrically connecting the segment to the armature windings and a finger extending from the brush contact portion and plastically deformed into a recess in the base thereby fixing the segment to the base; and bonding material disposed on the fingers and the base in the region of the recess to prevent relative movement between the base and the segments.
  • the present invention provides an electric motor incorporating a wound rotor including a commutator as herein described.
  • the fractional horsepower universal motor 10 of Figure 1 incorporates a commutator 30 according to the present invention.
  • the motor has a stator assembly including a stator core 11 and a stator winding 12 (only part of the coil is visible and the connecting leads have been omitted for clarity but are well known).
  • Mounted directly on the stator core 11 at either end are bearing brackets 13, 14.
  • Bearing bracket 14 supports brush gear comprising two carbon brushes 15 positioned for contact with the commutator and slidably disposed in insulating brush holders 16 fitted in apertures in the bearing bracket 14. Springs located inside the brush holders 16 urge the brushes 15 into contact with the commutator surface.
  • the bearing brackets 13, 14 support bearings 17 in which motor shaft 18 is journalled.
  • the shaft supports the commutator 30 and armature core 19 on which armature windings 20 are wound.
  • the armature windings 20 are connected to the commutator 30 by lead wires 21 which are terminated on terminals or tangs of the commutator.
  • the shaft also supports a fan 25 for cooling the motor 10.
  • a spacer hidden in Figure 1 by the lead wires 21 and resin 22 separates the commutator and the armature core to allow room for the armature windings.
  • the lead wires 21 wrap around the spacer to provide support for the lead wires which are subjected to vibration and centrifugal forces.
  • a trickling resin 22 coats the lead wires as they extend from the spacer to the commutator terminals to provide greater support.
  • the commutator 30 is more clearly shown in Figures 2, 3 and 4.
  • the commutator has a base 31 of moulded insulating material on which a plurality of commutator segments 32 are fitted.
  • the base 31 is cylindrical in shape with a central bore 33 for fitting to the motor shaft 18.
  • the base 31 has first and second axial ends 34, 35 and an outer cylindrical surface 36 covered by the segments.
  • the bore 33 has a step 37 in the first axial end 34 for receiving the spacer.
  • the first axial end which is located adjacent the commutator core is formed with a plurality of axially extending recesses 38.
  • the second axial end 35 which is located remote from the armature core, has a plurality of axially extending projections 39 and a recess or an annular groove 40 radially inward of the projections.
  • a lip 41 defines the inner edge of the groove.
  • the lip 41, groove 40 and projections 39 form a reservoir 42 for bonding material as will be described later.
  • Each segment 32 has an elongate brush contact portion 45 which is curved to sit on the surface 36 of the base 31 and extends axially along the base.
  • a tang or terminal 46 for making electrical connection with an armature lead wire 21.
  • the terminal shown is a weldable tang in the form of a U-shaped hook around which a lead wire 21 is looped and the tang is then pressed to collapse the hook around the wire while sufficient current is passed through the tang to burn off insulating varnish on the lead wire to ensure good electrical contact between the lead wire and the segment.
  • Each segment 32 is secured to the base 31 by fixing limbs comprising two fingers 47 extending axially from the brush contact portion 45 either side of the terminal 46 and a loop 48 extending radially from the opposite end of the brush contact portion 45.
  • the loop 48 is placed over a projection 39 on the second end 35 of the base 31.
  • the fingers 47 are plastically deformed into the recesses 38 in the first end 34 of the base 31 and into engagement with the wall of recess to secure the segment in place.
  • the segment is thus formlocked to the base.
  • the loop may be squeezed or pressed further into the annular groove 40 to secure the other end of the segment.
  • Bonding material 50 preferably the same resin used to coat the lead wires 21, is coated over the connection between the fixing limbs 47, 48 and the base 31.
  • the resin may be applied to both ends or only one end of the commutator.
  • the resin may be applied to the first end of the commutator at the same time the resin is being applied to the lead wires.
  • it could be applied to one or both ends after the commutator 30 has been assembled but before it is fitted to the shaft 18.
  • the first end of the commutator 30 as shown in Figure 2 has a plurality of recesses equal in number to the number of segments and adjacent fingers 47 of adjacent segments 32 share a common recess 38.
  • the resin 50 as shown in the upper portion of Figure 2 covers the recesses 38 and part of the pairs of fingers 47.
  • the resin bonds the fingers to the base to prevent any minute movement or vibration which may otherwise occur due to relaxation of the grip of insufficiency of the grip by the fingers on the base.
  • the number of recesses 38 of course could be varied between a separate recess for each finger to multiple fingers per recess including a single recess accommodating all the fingers.
  • the resin is omitted from the lower part of Figure 2 to show detail of the finger/recess arrangement.
  • the second end of the commutator as shown in Figure 3 has the loops 48 extending into the annular groove 40 and the resin 50 coats at least that part of the loops 48 within the groove to bond the loops to the base to prevent minute movement therebetween.
  • Resin 50 fills the reservoir 42 as shown in the upper portion of Figure 3. The resin has been omitted or cut away from the lower portion to show detail of the loops, groove and projections.
  • the preferred bonding material is a thixotropic polyester resin such as DOLPHON CC-1133/513-D Polyester Resin by John C. Dolph Company of U.S.A.
  • the resin may provide only a weak bond between the segments and the base, it is sufficient to prevent the vibrations or minute movements which can lead to premature commutator failure.
  • this arrangement is superior to gluing the segments directly to the commutator base as that method is difficult to do properly due to possible contamination of the commutator surface by the glue and the difficulty in achieving consistently reliable bonding due to the heat developed by the commutator in use and variations in the thickness of the glue which also affects the positioning of the segments. With the present invention, these problems are avoided.
  • loops or fingers may be used as the fixing limbs at either or both ends of the commutator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Current Collectors (AREA)
EP96305846A 1995-08-09 1996-08-09 Kollektor Withdrawn EP0759652A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9516329.1A GB9516329D0 (en) 1995-08-09 1995-08-09 Commutator
GB9516329 1995-08-09

Publications (1)

Publication Number Publication Date
EP0759652A1 true EP0759652A1 (de) 1997-02-26

Family

ID=10779001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96305846A Withdrawn EP0759652A1 (de) 1995-08-09 1996-08-09 Kollektor

Country Status (3)

Country Link
EP (1) EP0759652A1 (de)
CN (1) CN1148743A (de)
GB (1) GB9516329D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107733176A (zh) * 2017-09-26 2018-02-23 东莞市东翱智能科技有限公司 一种马达转向器与马达线圈的焊接工艺方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100456572C (zh) * 2004-11-19 2009-01-28 乐金电子(天津)电器有限公司 单相串联电机用换向器结构
DE102009054651A1 (de) * 2009-12-15 2011-06-16 Robert Bosch Gmbh Kommutator für eine elektrische Maschine und elektrische Maschine
CN103474854A (zh) * 2013-09-30 2013-12-25 苏州双航机电有限公司 一种换向器
CN104332793A (zh) * 2014-07-31 2015-02-04 瑞安市恒丰机电有限公司 一种换向器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1214538A (fr) * 1959-01-22 1960-04-08 Paris & Du Rhone Collecteur pour machine électrique
GB2203596A (en) * 1987-03-23 1988-10-19 Johnson Electric Ind Mfg Winding connections retention in an armature for an electric motor
EP0325353A2 (de) * 1988-01-19 1989-07-26 Johnson Electric S.A. Ein Stromwender
EP0361860A2 (de) * 1988-09-26 1990-04-04 Johnson Electric S.A. Zusammengebauter Kommutator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1214538A (fr) * 1959-01-22 1960-04-08 Paris & Du Rhone Collecteur pour machine électrique
GB2203596A (en) * 1987-03-23 1988-10-19 Johnson Electric Ind Mfg Winding connections retention in an armature for an electric motor
EP0325353A2 (de) * 1988-01-19 1989-07-26 Johnson Electric S.A. Ein Stromwender
EP0361860A2 (de) * 1988-09-26 1990-04-04 Johnson Electric S.A. Zusammengebauter Kommutator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107733176A (zh) * 2017-09-26 2018-02-23 东莞市东翱智能科技有限公司 一种马达转向器与马达线圈的焊接工艺方法

Also Published As

Publication number Publication date
CN1148743A (zh) 1997-04-30
GB9516329D0 (en) 1995-10-11

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