US1816629A - Pressed collector - Google Patents

Pressed collector Download PDF

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Publication number
US1816629A
US1816629A US347714A US34771429A US1816629A US 1816629 A US1816629 A US 1816629A US 347714 A US347714 A US 347714A US 34771429 A US34771429 A US 34771429A US 1816629 A US1816629 A US 1816629A
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United States
Prior art keywords
segments
copper
commutator
mica
rings
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
US347714A
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English (en)
Inventor
Worner Anton
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Individual
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Individual
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Filing date
Publication date
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Publication of US1816629A publication Critical patent/US1816629A/en
Anticipated expiration legal-status Critical
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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
    • H01R39/04—Commutators

Definitions

  • the present invention relates to commutators of the type in which the means, securing the copper bars or segments, are embedded in a molded insulating composition.
  • the usefulness of this type of commutator is limited, however, since the mechanical properties of the molded composition are insufhcient to take up the various stresses developed by the centrifugal forces during the rotation of the collector, the consequences of this stress being increased on account of the heat which arises simultaneously with the creation of the said stresses.
  • the invention eliminates these shortcomings by interposing between the copper segments and the molded composition a ⁇ body adapted to take up the tensile stresses created within the commutator and to transform them into compressive forces, which act on the molded composition arranged between the said body and segments.
  • ⁇ Figure Q is a fragmentary front view of the commutator, the ligure being drawn on a slightly enlarged scale and showing the coinmutator before shrinking of the same sets in.
  • Figure 2b is a fragmentary sectional front view of the commutator on line Ll-l of Fig. 3, the figure being drawn on a slightly enlarged scale and showing the commutator after shrinking of the same sets in.
  • Figure 3 is an axial section of the finished commutator and Figure l is a cross section thereof on thel line 4 4 of Figure 3.
  • the commutator comprises a copper seg- 347,74, and in Germany December 7, 1928.
  • the notches d extend from its narrow sides inwardly so that the copper segments a, as arranged in the commutator, are of a perfect lei shape, 2 prongs of the copper segments a extending equidistantly at both sices.
  • annular seamless ring such as an iron ring e
  • an annular seamless ring is inserted into each of said notches, so as to be flush with the outside ends of the copper segments and to have its inner peripheral face in temporary engagement with the upper peripheral face of the lower prongs of the copper segments a.
  • mica bars o are inserted between copper segments aand that they rest with their lower edge upon the outer peripheral face of the iron ring e. These mica bars are of rectangular' shape.
  • the copper segments a and the mica bars b are forced radially to the inside to suoli an extent that the inner peripheral faces of the upper prongs-of the copper segments a approach somewhat the rings e, but still leave a considerable interstice between each other.
  • the material of the mica bar is pressed towards the center of the commutator it may travel unhindered in the free space at the rear of the rings e so that, according to the Figures 2b and 3, it is protruding slightly beyond the inner peripheral face of the ring e.
  • Th-e mica bars b hold the iron rings e very firmly in a central position and being spread or upset, offer a broad support for the iron rings e. Moreover, they are protected against centrifugal displacement because their face acts like a dove-tail and the latter being firmly embedded in a filler consisting ⁇ of an insulating composition, which then in any of the usual ways is pressed into the skeleton formed by the copper segments a, the mica bars b and the iron rings e.
  • the insulating composition forms the hub of the commutator.
  • the insulating composition f fills up the intervening spaces between the copper segments a, the mica sheets b and the rings c, the interstices f1 and f2 and'any other interstice, except the space which later on is to be filled by the shaft on which the commutator is to rotate during its operation. It is thus obvious that each of the copper segments a is insulated in every direction and particularly from the iron rings e arranged within the notches d.
  • 'A commutator constructed according to vthe invention is capable of withstanding 20,-
  • the commutator possesses excellent mechanical properties which exclude the possibility of deformation. Moreover, it is extremely simple to manufacture, as the mica bars l) need not be centered any more during assembly, but center themselves by means of the' iron rings e.
  • mica bars do not cover the entire height of the copper segments, but extend merely up to the rings e.
  • a commutator consisting of electrically conductive segments of rectangular shape and pr vided with notches extending from the narrow sides .inwardly alongl the middle line, insulator segments, of rectangular shape and of smalleiI width than aforesaid conductive segments, havin part of their inner edge spread outwardly, both being alternately arranged in annular form so as to form a cylinder having an annular groove in each of its front and rear sides, a metal ring in each of aforesaid grooves being in contact with the outwardly spread inner edge of aforesaid insulator segments and being substantially equidistantly disposed from the walls of the notches of said conductive segments, and an electrically non-conductive iiller provided with an opening ⁇ for the shaft.
  • a commutator consisting of copper segments of rectangular shape and provided with notches extending from the narrow sides inwardly along the middle line, mica segments, of rectangular shape and of smaller width than aforesaid conductive segments, having part of their inner edge spread outwardly, both being alternately arranged in annular form so as to form a cylinder having anv annular groove in each of its front and rear sides, a steel ring in each of aforesaid grooves being in contact with the outwardly spread inner edge of aforesaid micay segments and being substantially equidistantly disposed from the walls of the notches of said copper segments, and an electrically nonconductive filler provided with an opening for the shaft.

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  • Motor Or Generator Current Collectors (AREA)
US347714A 1928-12-07 1929-03-16 Pressed collector Expired - Lifetime US1816629A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK112494D DE512733C (de) 1928-12-07 1928-12-07 Kollektor mit in eine Isoliermasse eingebetteten, durch besondere Isolierlamellen getrennten Kupfersegmenten

Publications (1)

Publication Number Publication Date
US1816629A true US1816629A (en) 1931-07-28

Family

ID=7744534

Family Applications (1)

Application Number Title Priority Date Filing Date
US347714A Expired - Lifetime US1816629A (en) 1928-12-07 1929-03-16 Pressed collector

Country Status (4)

Country Link
US (1) US1816629A (enrdf_load_stackoverflow)
BE (1) BE366446A (enrdf_load_stackoverflow)
DE (1) DE512733C (enrdf_load_stackoverflow)
FR (1) FR687027A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533775A (en) * 1948-09-11 1950-12-12 Frederick J Durrschmidt Commutator
US2639396A (en) * 1950-04-10 1953-05-19 N T Kyle Commutator, armature, and method of making the same
US3899705A (en) * 1971-06-03 1975-08-12 Bbc Brown Boveri & Cie Shrink-ring commutator segment assembly
US4056882A (en) * 1973-10-05 1977-11-08 Airscrew Howden Limited Method of making a dimensionally stable commutator
US4786835A (en) * 1985-08-28 1988-11-22 Robert Bosch Gmbh Commutator winding end supports for electric machines
US5140213A (en) * 1990-05-16 1992-08-18 Friedrich Nettelhoff Kommanditgesellschaft Spezialfabrik Fur Kleinkollektoren Collector for a dynamo electric machine
US20060082244A1 (en) * 2003-08-21 2006-04-20 Tobias Kuechen Commutator for an electrical machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533775A (en) * 1948-09-11 1950-12-12 Frederick J Durrschmidt Commutator
US2639396A (en) * 1950-04-10 1953-05-19 N T Kyle Commutator, armature, and method of making the same
US3899705A (en) * 1971-06-03 1975-08-12 Bbc Brown Boveri & Cie Shrink-ring commutator segment assembly
US4056882A (en) * 1973-10-05 1977-11-08 Airscrew Howden Limited Method of making a dimensionally stable commutator
US4786835A (en) * 1985-08-28 1988-11-22 Robert Bosch Gmbh Commutator winding end supports for electric machines
US5140213A (en) * 1990-05-16 1992-08-18 Friedrich Nettelhoff Kommanditgesellschaft Spezialfabrik Fur Kleinkollektoren Collector for a dynamo electric machine
US20060082244A1 (en) * 2003-08-21 2006-04-20 Tobias Kuechen Commutator for an electrical machine
US7375452B2 (en) * 2003-08-21 2008-05-20 Robert Bosch Gmbh Commutator for an electrical machine

Also Published As

Publication number Publication date
BE366446A (enrdf_load_stackoverflow) 1930-01-31
DE512733C (de) 1930-11-18
FR687027A (fr) 1930-08-04

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