US2887764A - Method for making commutators - Google Patents
Method for making commutators Download PDFInfo
- Publication number
- US2887764A US2887764A US377932A US37793253A US2887764A US 2887764 A US2887764 A US 2887764A US 377932 A US377932 A US 377932A US 37793253 A US37793253 A US 37793253A US 2887764 A US2887764 A US 2887764A
- Authority
- US
- United States
- Prior art keywords
- conductor
- coat
- die
- laminations
- mica
- 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
Links
- 238000000034 method Methods 0.000 title description 4
- 239000004020 conductor Substances 0.000 description 10
- 239000010445 mica Substances 0.000 description 8
- 229910052618 mica group Inorganic materials 0.000 description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- 238000003475 lamination Methods 0.000 description 6
- 238000000576 coating method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009750 centrifugal casting Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- CUXQLKLUPGTTKL-UHFFFAOYSA-M microcosmic salt Chemical compound [NH4+].[Na+].OP([O-])([O-])=O CUXQLKLUPGTTKL-UHFFFAOYSA-M 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- -1 silicic acid ester Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49009—Dynamoelectric machine
- Y10T29/49011—Commutator or slip ring assembly
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49016—Antenna or wave energy "plumbing" making
Definitions
- This invention relates to an electric conductor insulated and embedded in metal castings, more particularly in injection die-castings.
- a pulp By a method similar to the production of paper a pulp may be produced of small mica flakes obtained by comminuting the mica, which in some cases is prevoiusly heated and quenched; and such mica pulp may be manufactured like paper into foils, plates, shaped bodies, and so on.
- synthetic resin, silicone, or phosphoric acid may be added as binding means according to former proposals.
- the conductor is covered with a coat of small mica flakes and binding means at least along the embedded portion.
- the conductor may be surrounded, for example, with a foil or a jacket of this material before a metal is die-cast around or it may be painted with such a material or coated by immersing or spraying. In the latter case it is advisable to use extremely small mica flakes. They appear to have the property of arranging themselves in the coat of paint in positions parallel to the paint plane.
- the dielectric strength of the insulating coating is not afiected by the fact that the small flakes are reduced more and more. If phosphoric acid or microcosmic salt is employed as binding means, a good adhesion is obtained on the metal, particularly on iron. Consequently, the embedded conductor is jammed tight. In some cases it is advisable to heat the coat before embedding in such manner that all gasifying or vaporizing components of the binding means may escape. By this means bubble formation along the embedded portion of the insulated conductor and consequent detachment of mica particles is avoided.
- a binding agent such as phosphoric acid, microcosmic salts, organic combinations of silicic acid adhere tightly between the small mica flakes in such manner that the combination will not dissolve even if water and other liquids react on it. If silicone, silicic acid ester or the like are employed as binding means the organic components seem to escape so that the residual silicic acid may produce a solid combination of the small flakes.
- the invention may be employed for various purposes.
- FIGS. 1 to 4 of the drawing show diagrammatically by way of example a number of embodiments of the invention.
- an insulated terminal conductor 1 for a motor or other electrical apparatus is to be tightly led through a cover 2, for example, of a flameproof or a moisture-proof casing.
- a cover 2 for example, of a flameproof or a moisture-proof casing.
- said casing cover is provided with an aforesaid insulation coat 3 surrounding the conductor and subsequently the casing 2 is die-cast around or cast around the insulated conductor.
- FIG. 2 shows part of an immersion heater.
- the heating Wire 4 is surrounded with such a coat 3, for example, by immersing or spraying. Subsequently the metal 5 is die-cast around.
- Such an immersion heater or the like is particularly advantageous because the temperature gradient within the heating body is very small, since only the thin coat 3 consists of insulating material. Consequently, the heating wire 4 may not assume considerably higher temperatures than the material to be heated. It is thus protected against heating up and has a long durability.
- the insulating coatings 3 may be removed from the contact surfaces 9 and the adjacent electrical connection areas by turning them oif in a lathe.
- the method of manufacturing commutators for electrical machines comprising coating peripheral conductor laminations with a mixture of fine mica flake particles and a binding agent, casting a metallic central hub casting about and at least partly embedding said conductor laminations, and finally machining down the outer periphery of said peripheral laminations to remove the coatings therefrom.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
- Motor Or Generator Current Collectors (AREA)
Description
May 26, 1 959 K. KNOLL ETAL METHOD FOR MAKING COMMUTATORS Filed Sept. 1. 1953 Fig.2
Fig. 1
United States Patent METHGD FUR MAKING COMIVIUTATORS Karl Knoll, Feucht, near Nnrnberg, and Hans-Werner Rotter and Siegfried Voll, Number-g, Germany, assignors to Siemens -St-hneliertwerke Alrtiengesellschaft, lieriiniemensstadt, Germany, a corporation of Germany Application September 1, 1953, Serial No. 377,932
Claims priority, application Germany September 4, 1952 1 Claim. (Cl. 29155.54)
This invention relates to an electric conductor insulated and embedded in metal castings, more particularly in injection die-castings.
By a method similar to the production of paper a pulp may be produced of small mica flakes obtained by comminuting the mica, which in some cases is prevoiusly heated and quenched; and such mica pulp may be manufactured like paper into foils, plates, shaped bodies, and so on. In order to prevent decomposition of the final product due to moisture, synthetic resin, silicone, or phosphoric acid may be added as binding means according to former proposals.
It is diflicult to find an insulation which resists the mechanical and thermal stresses if a metal is die-cast around and which thereafter is electrically sufficiently tight. This invention eliminates these difliculties. According to the invention the conductor is covered with a coat of small mica flakes and binding means at least along the embedded portion. Thus, the conductor may be surrounded, for example, with a foil or a jacket of this material before a metal is die-cast around or it may be painted with such a material or coated by immersing or spraying. In the latter case it is advisable to use extremely small mica flakes. They appear to have the property of arranging themselves in the coat of paint in positions parallel to the paint plane. At all events the dielectric strength of the insulating coating is not afiected by the fact that the small flakes are reduced more and more. If phosphoric acid or microcosmic salt is employed as binding means, a good adhesion is obtained on the metal, particularly on iron. Consequently, the embedded conductor is jammed tight. In some cases it is advisable to heat the coat before embedding in such manner that all gasifying or vaporizing components of the binding means may escape. By this means bubble formation along the embedded portion of the insulated conductor and consequent detachment of mica particles is avoided. In this case a binding agent, such as phosphoric acid, microcosmic salts, organic combinations of silicic acid adhere tightly between the small mica flakes in such manner that the combination will not dissolve even if water and other liquids react on it. If silicone, silicic acid ester or the like are employed as binding means the organic components seem to escape so that the residual silicic acid may produce a solid combination of the small flakes.
The invention may be employed for various purposes.
2,887,764 Patented May 26, 1959 "ice For a better understanding of the invention and to show how the same may be carried into effect, reference will now be made to the accompanying drawings.
Figures 1 to 4 of the drawing show diagrammatically by way of example a number of embodiments of the invention.
In Figure 1 an insulated terminal conductor 1 for a motor or other electrical apparatus is to be tightly led through a cover 2, for example, of a flameproof or a moisture-proof casing. For this purpose said casing cover is provided with an aforesaid insulation coat 3 surrounding the conductor and subsequently the casing 2 is die-cast around or cast around the insulated conductor.
Figure 2 shows part of an immersion heater. The heating Wire 4 is surrounded with such a coat 3, for example, by immersing or spraying. Subsequently the metal 5 is die-cast around. Such an immersion heater or the like is particularly advantageous because the temperature gradient within the heating body is very small, since only the thin coat 3 consists of insulating material. Consequently, the heating wire 4 may not assume considerably higher temperatures than the material to be heated. It is thus protected against heating up and has a long durability.
Figure 3 shows a section of a commutator for electrical machines and other contact apparatuses such as regulators. The laminations 6 are covered face to face and at the parts having dovetails with the above-mentioned coat 3. They are arranged in a die mold and the hub 8 is die-cast in or cast in, in some case according to the centrifugal casting process. The coat 3 of the laminations 6 may be produced by spraying or immersing. In this case it covers the laminations at all sides (see Figure 4).
After completion, the insulating coatings 3 may be removed from the contact surfaces 9 and the adjacent electrical connection areas by turning them oif in a lathe.
We claim:
The method of manufacturing commutators for electrical machines comprising coating peripheral conductor laminations with a mixture of fine mica flake particles and a binding agent, casting a metallic central hub casting about and at least partly embedding said conductor laminations, and finally machining down the outer periphery of said peripheral laminations to remove the coatings therefrom.
References Cited in the file of this patent UNITED STATES PATENTS 522,718 Leonard July 10, 1894 1,416,036 Kempton May 16, 1922 1,494,939 Abbott May 20, 1924 1,533,270 Reid Apr. 14, 1925 1,750,305 Gross Mar. 11, 1930 1,878,178 Power Sept. 20, 1932 2,077,282 Strom et al. Apr. 13, 1937 2,084,263 Boughton et al. June 15, 1937 2,341,235 Palmer Feb. 8, 1949 2,656,403 Sealey Oct. 20, 1953
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2887764X | 1952-09-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2887764A true US2887764A (en) | 1959-05-26 |
Family
ID=8000490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US377932A Expired - Lifetime US2887764A (en) | 1952-09-04 | 1953-09-01 | Method for making commutators |
Country Status (1)
Country | Link |
---|---|
US (1) | US2887764A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3146322A (en) * | 1960-08-30 | 1964-08-25 | Terence M P Farrell | Rotary electric switch having a plurality of contacts |
US3293694A (en) * | 1962-03-05 | 1966-12-27 | Dayton Prec Corp | Mold apparatus for making subflush commutators |
DE1248152B (en) * | 1960-11-25 | 1967-08-24 | Siemens Ag | Commutator for electrical machines with hub and pressure rings and mica as lamellar insulation, in which an electrically insulating filler material is poured into the cavities between the lamellar ring, hub and pressure rings |
US3496634A (en) * | 1966-12-30 | 1970-02-24 | Ibm | Method of wiring and metal embedding an electrical back panel |
FR2475305A1 (en) * | 1980-02-05 | 1981-08-07 | Cem Comp Electro Mec | Composite commutator for traction motor - with each wiper formed of good conducting metal outer and metal inner parts sepd. by insulator and dovetailed together |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US522718A (en) * | 1894-07-10 | Harry ward leonard | ||
US1416036A (en) * | 1918-07-25 | 1922-05-16 | Westinghouse Electric & Mfg Co | Insulation and method of making same |
US1494939A (en) * | 1922-09-23 | 1924-05-20 | Gen Electric | Electric heater |
US1533270A (en) * | 1922-11-07 | 1925-04-14 | Westinghouse Electric & Mfg Co | Furnace terminal |
US1750305A (en) * | 1927-11-19 | 1930-03-11 | Westinghouse Electric & Mfg Co | Insulating material |
US1878178A (en) * | 1930-05-05 | 1932-09-20 | Allen Bradley Co | Insulating composition |
US2077282A (en) * | 1931-03-10 | 1937-04-13 | Westinghouse Electric & Mfg Co | Electrical arc extinguishing and insulating material |
US2084263A (en) * | 1934-09-25 | 1937-06-15 | New England Mica Co | Products bonded with the resinous reaction products from polyhydric alcohols and phosphoric acid compound |
US2341235A (en) * | 1941-06-23 | 1944-02-08 | Gen Cable Corp | Insulated electrical conductor and method of manufacture |
US2656403A (en) * | 1950-04-24 | 1953-10-20 | Allis Chalmers Mfg Co | Grommeted lead panel for oil-filled electrical apparatus |
-
1953
- 1953-09-01 US US377932A patent/US2887764A/en not_active Expired - Lifetime
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US522718A (en) * | 1894-07-10 | Harry ward leonard | ||
US1416036A (en) * | 1918-07-25 | 1922-05-16 | Westinghouse Electric & Mfg Co | Insulation and method of making same |
US1494939A (en) * | 1922-09-23 | 1924-05-20 | Gen Electric | Electric heater |
US1533270A (en) * | 1922-11-07 | 1925-04-14 | Westinghouse Electric & Mfg Co | Furnace terminal |
US1750305A (en) * | 1927-11-19 | 1930-03-11 | Westinghouse Electric & Mfg Co | Insulating material |
US1878178A (en) * | 1930-05-05 | 1932-09-20 | Allen Bradley Co | Insulating composition |
US2077282A (en) * | 1931-03-10 | 1937-04-13 | Westinghouse Electric & Mfg Co | Electrical arc extinguishing and insulating material |
US2084263A (en) * | 1934-09-25 | 1937-06-15 | New England Mica Co | Products bonded with the resinous reaction products from polyhydric alcohols and phosphoric acid compound |
US2341235A (en) * | 1941-06-23 | 1944-02-08 | Gen Cable Corp | Insulated electrical conductor and method of manufacture |
US2656403A (en) * | 1950-04-24 | 1953-10-20 | Allis Chalmers Mfg Co | Grommeted lead panel for oil-filled electrical apparatus |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3146322A (en) * | 1960-08-30 | 1964-08-25 | Terence M P Farrell | Rotary electric switch having a plurality of contacts |
DE1248152B (en) * | 1960-11-25 | 1967-08-24 | Siemens Ag | Commutator for electrical machines with hub and pressure rings and mica as lamellar insulation, in which an electrically insulating filler material is poured into the cavities between the lamellar ring, hub and pressure rings |
US3293694A (en) * | 1962-03-05 | 1966-12-27 | Dayton Prec Corp | Mold apparatus for making subflush commutators |
US3496634A (en) * | 1966-12-30 | 1970-02-24 | Ibm | Method of wiring and metal embedding an electrical back panel |
FR2475305A1 (en) * | 1980-02-05 | 1981-08-07 | Cem Comp Electro Mec | Composite commutator for traction motor - with each wiper formed of good conducting metal outer and metal inner parts sepd. by insulator and dovetailed together |
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