US3735171A - Flat commutator structure - Google Patents

Flat commutator structure Download PDF

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Publication number
US3735171A
US3735171A US00180027A US3735171DA US3735171A US 3735171 A US3735171 A US 3735171A US 00180027 A US00180027 A US 00180027A US 3735171D A US3735171D A US 3735171DA US 3735171 A US3735171 A US 3735171A
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US
United States
Prior art keywords
commutator
segments
collector
commutator structure
anchoring elements
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
US00180027A
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English (en)
Inventor
De Griend J Van
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.)
US Philips Corp
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US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3735171A publication Critical patent/US3735171A/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
    • 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
    • H01R39/06—Commutators other than with external cylindrical contact surface, e.g. flat 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
    • 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

  • Both the hub and the latter anchoring elements may form parts of a single commutator support made from a synthetic material by injection moulding and preferably have open chambers into which the grooves separating the commutator segments terminate.
  • the invention relates to a flat commutator structure for use in a small electro-dynamic machine comprising a plurality of collector segments made of sheet metal which are insulated from each other and at the shaft ends are anchored in an injected hub made from a synthetic material.
  • a hub injected from a synthetic material is used by those skilled in the art to mean a hub which is made by injection moulding in a mould in which previously the collector segments have been placed, so that on termination of the injection moulding process given portions of the segments are embedded in the hub material.
  • a first advantage consists in the freedom in respect of the choice of the material of the contact layer. When electrodeposition is used, this choice is greatly restricted. The same applies to the nature of the surface, the mechanical properties and the structure of the contact layer.
  • the effective contact resistance is influenced by the choice of the materials of the contact surfaces of the commutator and the brushes, by the contaminations which lodge between the said contact surfaces, inter alia owing to wear, and by the degree in which the resilient metal brushes dance on the collector surface.
  • This dancing is a dynamic phenomenon which consists in that in operation the brushes may vibrate so that the contact faces of the commutator segments and of the resilient brushes are not in continuous contact. If the contact faces are in contact with one another for the major part of the time, the effective contact resistance is smaller than when they are in contact with one another for a minor part of the time.
  • a high rate of dancing means an increased effective contact resistance.
  • This adversely affects the desired constancy of the contact resistance in an indirect manner, for an increased effective contact resistance means that higher current densities are required at the contact faces of the commutator and the brushes. This results in faster wear and hence reduces the life of the motor, but it also means increased contamination of the contact surfaces by wear particles, and these again may give rise to increased dancing" and may cause short circuits between the commutator segments, which renders electronic control impossible.
  • Another factor is that the distance of the commutator contact faces and the brushes from the motor shaft should be a minimum, for with a small distance the relative speed of the contactsurfaces and hence the wear is low.
  • the invention provides a commutator construction of the type mentioned at the beginning of this specification, in which these disadvantages are obviated and which is characterized in that the collector segments are interconnected by anchoring elements near the outer periphery of the commutator also.
  • the anchoring elements at the outer periphery enable the commutator to be of a flatter structure than has been possible hitherto. Moreover, their provision enables the hub diameter and hence the distance of the contact faces of the commutator and the brushes from the motor shaft to be reduced.
  • an embodiment is of importance which is characterized in that anchoring elements of the said kind anchor the commutator segments immediately on either side of the slots between them.
  • a commutator construction in accordance with a further embodiment of the invention is used, which is characterized in that the hub and the said anchoring elements form part of a single integral commu tator support made of a synthetic material by injection moulding.
  • another embodiment of the invention is of importance which is characterized in that the grooves between the commutator segments open into open chambers of the commutator support. Another important advantage of this embodiment will become apparent upon consideration of the detailed description with reference to the figures.
  • each commutator segment has a lug which is situated at the outer periphery of the commutator about midway between the two adjoining commutator grooves and is bent axially and is anchored to, and passes through, the commutator support so as to make contact with the antiinterference member.
  • FIG. 1 is an elevation of a commutator structure according to the invention enlarged to ten times the actual size and viewed from the commutator side,
  • FIG. 2 is an equally enlarged sectional view of the commutator structure of FIG. 1, and
  • FIG. 3 is an elevation, enlarged to twice the actual size, of part of a metal strip in the form it has after several stamping operations, which strip is an intermediate product in the manufacture of the commutator structure shown in FIGS. 1 and 2.
  • the commutator structure shown in FIG. 1 comprises three commutator segments 1, 2 and 3 made of sheet material and anchored at the ends nearer the shaft in a hub 4 which is made of a synthetic material by injection moulding. Near the outer periphery of the commutator the commutator segments are interconnected by anchoring elements 5, 6 and 7. These anchor the segments immediately on either side of commutator grooves 8, 9 and 10.
  • FIG. 2 shows, more clearly than does FIG. 1, that the hub 4 and the anchoring elements 5, 6 and 7 form parts of an integral commutator support 11 which is made of a synthetic material by injection moulding.
  • This Figure also shows clearly that the commutator groove opens into an open chamber 12 in the commutator support 11. The other collector grooves also terminate in such open chambers.
  • a disc-shaped antiinterference member 13 of a known type which comprises a disc made of material having a voltagedependent resistance value on either major surface of which a conductive pattern is provided.
  • the commutator segments 1, 2 and 3 each have near the outer periphery of the commutator and about midway between the two adjoining commutator grooves a lug 14, 15 and 16, respectively, which are bent over axially. These lugs are anchored in the commutator support 11 and protrude through it so as to make contact with the anti-interference member 13. The latter is urged against the ends of the lugs l4, l5 and 16 by a slotted cup-spring 17 mounted on the hub 4.
  • the commutator segments 1, 2 and 3 and the lugs 14, 15 and 16, which have not yet been bent over, can already be distinguished.
  • the strip 18 is an intermediate product in the manufacture of the collector structure shown in FIGS. 1 and 2, and the Figure shows the shape of the strip after it has been subjected to all the stamping operations which precede the injection moulding of the commutator support.
  • the strip 18, which is made of phosphor bronze, is covered with a layer 19 of a noble-metal alloy by rolling.
  • commutator supports 11 are simultaneously made in a single operation in the injection moulding machine.
  • the commutators are stamped from the strip and the segments are severed from one another by making notches 20, 21 and 22 (FIG. 1).
  • Projections 23, 24 and 25 serve to connect the end connections of a rotor coil to the commutator segments 1, 2 and 3, respectively.
  • clamping elements may be disposed in the mould which clamp the segments immediately on either side of the commutator grooves during the formation of the commutator support 11, by injection moulding.
  • a commutator structure for a small electrodynamic machine comprising:
  • a plurality of substantially flat metallic elements defining separate and distinct collector segments each having an inner portion and an outer portion, said inner portion of each segment being anchored to said hub member, and said outer portion being connected to said peripheral anchoring elements.
  • each collector segment is connected to a pair of peripheral anchoring elements.
  • each collector segment shares a peripheral anchoring element with another collector segment.
  • each of said collector segments has a lug located upon an outer periphery thereof which is anchored in, and extends through, the commutator support to make contact with said anti-interference member.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Coloring (AREA)
US00180027A 1970-09-23 1971-09-13 Flat commutator structure Expired - Lifetime US3735171A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7014025A NL7014025A (zh) 1970-09-23 1970-09-23

Publications (1)

Publication Number Publication Date
US3735171A true US3735171A (en) 1973-05-22

Family

ID=19811134

Family Applications (1)

Application Number Title Priority Date Filing Date
US00180027A Expired - Lifetime US3735171A (en) 1970-09-23 1971-09-13 Flat commutator structure

Country Status (7)

Country Link
US (1) US3735171A (zh)
JP (1) JPS477023A (zh)
CH (1) CH531262A (zh)
DE (1) DE2143727A1 (zh)
FR (1) FR2108399A5 (zh)
IT (1) IT939834B (zh)
NL (1) NL7014025A (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4153985A (en) * 1977-04-27 1979-05-15 Eastman Kodak Company Method of looping armature coil leads about commutator tangs
US5006765A (en) * 1986-03-06 1991-04-09 Papst-Motoren Gmbh & Co. Kg DC motor with coreless coil installation
US5155405A (en) * 1991-03-08 1992-10-13 Elpatronic Ag Electrode roller with flexible current transmitting disc
US5530311A (en) * 1994-05-24 1996-06-25 Mccord Winn Textron, Inc. Face type commutator with sideways tangs and a method of making the commutator

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2218666B1 (zh) * 1973-02-20 1978-06-23 Seim
FR2378383A1 (fr) * 1977-01-19 1978-08-18 Sesame Anc Fils Charles Vuilla Procede de fabrication de collecteur plat pour moteur electrique et collecteur realise selon le procede
EP0175992B1 (de) * 1984-09-19 1988-05-11 Siemens Aktiengesellschaft Verfahren zur Herstellung einer Bürstenhalterung einer Kommutatormaschine
GB2202686B (en) * 1987-03-23 1991-08-14 Johnson Electric Ind Mfg An armature for an electric motor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4153985A (en) * 1977-04-27 1979-05-15 Eastman Kodak Company Method of looping armature coil leads about commutator tangs
US5006765A (en) * 1986-03-06 1991-04-09 Papst-Motoren Gmbh & Co. Kg DC motor with coreless coil installation
US5155405A (en) * 1991-03-08 1992-10-13 Elpatronic Ag Electrode roller with flexible current transmitting disc
US5530311A (en) * 1994-05-24 1996-06-25 Mccord Winn Textron, Inc. Face type commutator with sideways tangs and a method of making the commutator

Also Published As

Publication number Publication date
CH531262A (de) 1972-11-30
DE2143727A1 (de) 1972-03-30
NL7014025A (zh) 1972-03-27
IT939834B (it) 1973-02-10
JPS477023A (zh) 1972-04-17
FR2108399A5 (zh) 1972-05-19

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