US3785049A - Slip ring assembly and method of making same - Google Patents

Slip ring assembly and method of making same Download PDF

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Publication number
US3785049A
US3785049A US00141923A US14192371A US3785049A US 3785049 A US3785049 A US 3785049A US 00141923 A US00141923 A US 00141923A US 14192371 A US14192371 A US 14192371A US 3785049 A US3785049 A US 3785049A
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US
United States
Prior art keywords
wire
wire terminals
conductive rings
grooves
terminals
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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
US00141923A
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English (en)
Inventor
H Tatsumi
H Kanamaru
Y Ohuchi
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Hitachi Ltd
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Hitachi Ltd
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Publication date
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Publication of US3785049A publication Critical patent/US3785049A/en
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    • 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
    • H01R39/08—Slip-rings
    • 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
    • H01R43/10—Manufacture of slip-rings
    • 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

Definitions

  • the terminals are fitted in diametrically spaced grooves formed on the cylindrical base and the conductive rings are press-fitted on the cylindrical base thereby to bring the conductive rings into pressure contact with the respective terminals and to ensure satisfactory engagement of the conductive rings with the cylindrical base.
  • Conventional slip ring assemblies of this kind have been made by preparing conductive rings separately from terminals, welding the terminals to the respective conductive rings and molding theconductive rings with a molding material to obtain a slip ring assembly or, as disclosed in U.S. Pat. No. 3,435,402, by punching out conductive strips each provided with a terminal from a sheet of conductive material by means of a press, forming these conductive strips into an annular shape to obtain conductive rings, setting two conductive rings on a mold in suitably spaced apart relation from each other, and molding with a thermo-setting molding material such as a polyester resin in such a manner that the outer peripheral surface of the conductive rings is exposed to outside from the molded structure.
  • claws In such a conventional slip ring assembly, claws must be provided on the conductive rings in order to ensure a better bond between the conductive rings and the molding material and to prevent undesirable deformation of the conductive ring and the molding material due to the thermal contraction of the molding material. Due to the need for provision of such claws, the conductive rings must have a correspondingly greater thickness which results in the wasteful use of the conductive material and is thus uneconomical.
  • the terminals are joined to the conductive rings by means of soldering, brazing or electric welding and then the conductive rings are molded with a molding material. Thus, molding pressure is imparted to the terminals during the molding to apply a breaking force to the weld thereby reducing the reliability of the weld.
  • a heating loss occurs generally in the molding material which is therefore subject to shrinkage. This is objectionable for the proper performance of the machine in that an undesirable clearance is produced between the inner peripheral surface of the conductive rings and the outer peripheral surface of the molding material during the operation of the machine and the conductive rings are subject to deformation thereby bringing forth unsatisfactory sliding engagement with the associated brushes.
  • Another object of the present invention is to provide a slip ring assembly and a method of making same in which a generally U-shaped wire is used to provide the terminals so as to improve the productivity and workability.
  • a further object of the present invention is to provide a slip ring assembly having a molded cylindrical base which is formed with a plurality of spaced grooves for receiving the terminals therein, each groove including a combination of a portion having a depth larger than the diameter of the terminal and a portion having a depth smaller than the diameter of the terminal so that electrical connection and insulation can be simply carried out on a single line.
  • a method of making a slip ring assembly comprising the steps of preparing a molded cylindrical base, a plurality of conductive rings and a plurality of wire terminals separately from one another, said molded cylindrical base being formed with a plurality of axially extending grooves each having a deep portion and a shallow portion, disposing said wire terminals in said grooves respectively, and press-fitting said conductive rings on said cylindrical base in spaced apart relationship from each other thereby to electrically and mechanically connect said conductive rings and said wire terminals with each other so as to obtain an assembly of said molded cylindrical base, said conductive rings, and said wire terminals.
  • the present invention also contemplates the assembled slip ring assembly construction according to this method.
  • the slip ring assembly can be produced at low cost with a high productivity.
  • the slip ring assembly is free from any deformation of the conductive rings and the molded cylindrical base due to thermal contraction of the molded cylindrical base. Further, the slip ring assembly thus manufactured shows a high reliability due to the fact that the welding of the wire terminals to the conductive rings is unnecessary.
  • FIG. 1 is a perspective view of a slip ring assembly made by a method embodying the present invention.
  • FIG. 2 is a sectional view taken on the line 11-11 in FIG. 1.
  • FIG. 3 is a sectional view taken on the line III-III in FIG. 1.
  • FIG. 4 is an axial sectional front elevation of a molded cylindrical base having conductive rings and terminals set at predetermined positions thereon.
  • FIG. 5 is an exploded perspective view showing the components of the slip ring assembly.
  • a slip ring assembly according to the present invention comprises a molded cylindrical base 1 of electrically insulating material such as a phenol resin, simple conductive rings 2 and 3, and wire terminals 4 and 5.
  • a pair of diametrically spaced grooves 6 and 7 are formed on the outer peripheral surface of the molded cylindrical base 1 to extend in the axial direction thereof. The grooves 6 and 7 receive the respective terminals 4 and 5 therein so as to electrically connect the conductive rings 2 and 3 with the respective terminals 4 and 5.
  • the conductive rings 2 and 3 have an inner diameter of, for example, 29.0 mm and the molded cylindrical base 1 has an outer diameter of, for example, 29.1 to 29.2 mm so that the conductive A contact with the wire terminal 4 at this portion, while the portion of the groove 7 underlying the conductive ring 2 has a depth larger than the diameter of the wire terminal so that a space for electrically insulating the conductive ring 2 from the wire terminal 5 can be maintained therebetween and an electrically insulating sleeve 8 can be disposed in the space.
  • the portion of the groove 6 underlying the conductive ring 3 has a depth larger than the diameter of the wire terminal 4 so that the unnecessary portion of the wire terminal 4 can be easily removed from the groove 6, while the portion of the groove 7 underlying the conductive ring 3 has a depth smaller than the diameter of the wire terminal 5 so that the conductive ring 3 press-fitted on the molded cylindrical base 1 can be brought into pressure contact with the wire terminal 5 at this portion.
  • the length of the deep portion of the groove 7 is different from that of the deep portion of the groove 6 as seen.
  • a generally U-shaped wire A to provide the wire terminals 4 and 5 is fitted in the grooves 6 and 7 formed on the molded cylindrical base 1 and then the conductive rings 2 and 3 are successively press-fitted on the molded cylindrical base 1 from one end of the latter, After positioning the conductive rings 2 and 3 at predetermined positions as shown in FIG. 4, the electrically insulating sleeve 8 for preventing short-circuit between the conductive rings 2 and 3 is fitted on the wire A and the wire A is severed at points A, and A Finally, the remaining wire portions are bent as required to provide the wire terminals 4 and 5.
  • the conductive rings 2 and 3 can be brought into pressure contact and completely electrically connected with the respective wire terminals 4 and 5 at predetermined positions by merely pressfitting the conductive rings 2 and 3 on the molded cylindrical base 1. While a generally U-shaped wire is desirably used in the embodiment of the present invention, it will be understood that a straight wire may be used in lieu thereof to attain the effect similar to that above described.
  • the present invention provides a method of making a slip ring assembly comprising the steps of preparing a molded cylindrical base, a plurality of conductive rings and a plurality of wire terminals separately from one another, said molded cylindrical base being formed with a plurality of axially extending grooves each having a deep portion and a shallow portion, disposing said wire terminals in said grooves respectively, and press-fitting said conductive rings on said cylindrical base in spaced apart relation from each other thereby to electrically and mechanically connect said conductive rings and said wire terminals with each other so as to obtain an assembly of said molded cylindrical base, said conductive rings and said wire terminals.
  • the slip ring assembly can be produced at low cost with a high productivity.
  • the slip ring assembly is free from any deformation of the conductive rings and the molded cylindrical base due to thermal contraction of the molded cylindrical base. Further, the slip ring assembly thus manufactured shows a high reliability due to the fact that welding of the wire terminals to the conductive rings is unnecessary.
  • Slip ring assemblies made by the method of the present invention were subjected to a test under severe conditions including a high temperature and a very low temperature.
  • one heating ad cooling cycle included heating to 170 C for 23 hours, cooling to 30 C for 1 hour, heating to C for 47 hours at a relative humidity of 80 percent and allowing to stand at room temperature for 1 hour, and the slip ring assemblies were subjected to ten such heating and cooling cycles.
  • the test results showed that the outer diameter of the conductive rings varied in the range of from 0.004 to 0.014 mm which is very small compared with the range of from 0.1 to 0.2 mm in the case of the conductive rings in conventional slip ring assemblies.
  • the molded cylindrical base was subjected to after-curing at 240 C for 4 hours prior to the test to remove moisture and any other volatile matters therefrom for the purpose of sufficient aging.
  • the tensile strength of the wire terminals lay in the range of 61 to 98 Kg per square mm. It will thus be understood that the variation in the dimension of the molded cylindrical base due to aging is about one-fifth that of conventional slip ring assemblies and the slip ring assembly according to the present invention can operate over a long period of time without any deformation.
  • a method of making a slip ring assembly comprising the steps of separately preparing a base of electrical insulating material having a cylindrical base part, a plurality of conductive rings and a plurality of wire terminals of the same number as that of said conductive rings, the step of preparing said cylindrical insulating base part including forming a plurality of grooves of the same number as that of said conductive rings for receiving said wire terminals therein, axially extending each of said grooves through the overall length of said cylindrical base part, and forming each groove with a shallow portion having a depth substantially smaller than the thickness of said wire terminals at a predetermined position of the cylindrical base part where a corresponding conductive ring is to be press-fitted and with a deep portion having a depth substantially larger than the thickness of said wire terminals at the remaining portion of the groove excepting said shallow portion, disposing one of said wire terminals in each of said respective grooves, and press-fitting said conductive rings onto the respective predetermined positions of said cylindrical base part such that each of said wire terminals is
  • said base includes an end part adjacent said cylindrical base part which has a greater cross-sectional area than said cylindrical base part, wherein openings are provided in said end part which are aligned with respective ones of said grooves, and wherein said disposing of said wire terminals includes extending portions of said wire terminals through said openings.
  • a method according to claim 4 further comprising bending the extreme ends of said wire terminals extending through said openings to form attachment points for electrical circuitry after said press-fitting.
  • a method according to claim 4, wherein said disposing of said wire terminals includes positioning the legs of a U-shaped piece of wire in two respective grooves, and further comprising cutting off unnecessary portions of said U-shaped piece of wire after said press-fitting.
  • a method according to claim 1 including preparing said cylindrical part with a constant diameter along its length and preparing each of said conductive rings similar inner diameters.
  • a method of making a slip ring assembly comprising the steps of separatelyipreparing a base of electrical insulating material having a first part with constant cross-section along its length, a plurality of conductive rings and a plurality of wire terminals of the same number as that of said conductive rings, the step of preparing said first part including forming a plurality of grooves of the same number as that of said conductive rings for receiving said wire terminals therein, axially extending each of said grooves through the overall length of said first part, and forming each groove with a shallow portion having a depth substantially smaller than the thickness of said wire terminals at a predetermined position of the first part where a corresponding conductive ring is; to be press-fitted and with a deep portion having a depth substantially larger than the thickness of said wire terminals at the remaining portion of the groove accepting said shallow portion, disposing one of said wire terminals in each of said respective grooves, and press-fitting said conductive rings onto the respective predetermined positions of said first part such that each of said wire terminals is
  • a method according to claim 10 further comprising positioning wire insulation in surrounding engagement over a predetermined portion of the length of at least one of said wire terminals prior to disposing said at least one wire terminal in one of said respective grooves, wherein said disposing of said wire terminals includes positioning said one of said wire terminals with the wire insulation extending along the deep portion of the corresponding groove.
  • said base includes an end part adjacent said first part which has a greater cross-sectional area than said first part, wherein openings are provided in said end part which are aligned with respective ones of said grooves, and wherein said disposing of said wire terminals includes extending portions of said wire terminals through said openings.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Motor Or Generator Current Collectors (AREA)
US00141923A 1970-05-15 1971-05-10 Slip ring assembly and method of making same Expired - Lifetime US3785049A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45040942A JPS50488B1 (enrdf_load_stackoverflow) 1970-05-15 1970-05-15

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US3785049A true US3785049A (en) 1974-01-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00141923A Expired - Lifetime US3785049A (en) 1970-05-15 1971-05-10 Slip ring assembly and method of making same

Country Status (3)

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US (1) US3785049A (enrdf_load_stackoverflow)
JP (1) JPS50488B1 (enrdf_load_stackoverflow)
DE (2) DE7118954U (enrdf_load_stackoverflow)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2322706A1 (fr) * 1975-09-05 1977-04-01 Fischer Artur Ensemble de percage
US4219249A (en) * 1977-08-26 1980-08-26 Motorola, Inc. Ultrasonic welding process for automobile alternator slip rings
US4557535A (en) * 1984-09-17 1985-12-10 Whirlpool Corporation Electrical hose swivel connector for canister vacuum cleaner
US4618793A (en) * 1984-03-23 1986-10-21 Hitachi, Ltd. Rotor for alternators with molded slipring assembly
US5327037A (en) * 1992-11-23 1994-07-05 Ford Motor Company Automotive alternator slip ring assembly
US5445528A (en) * 1994-05-31 1995-08-29 The Whitaker Corporation Electrical connector with improved mounting
US5472647A (en) * 1993-08-02 1995-12-05 Thiokol Corporation Method for preparing anhydrous tetrazole gas generant compositions
US5542850A (en) * 1994-06-30 1996-08-06 The Whitaker Corporation Pivotal electrical connector
US5551143A (en) * 1992-11-06 1996-09-03 Ford Motor Company Rotor shaft having lead wire passage slots and method of forming collar support by cold heading
US5734218A (en) * 1996-05-13 1998-03-31 Litton Systems, Inc. Electrical slip ring and method of manufacturing same
US5886451A (en) * 1997-10-30 1999-03-23 Ford Motor Company Wire routing design for a rotor of an electrical machine
US6266876B1 (en) * 1999-11-12 2001-07-31 Litton Systems, Inc. Method of gap filling a conductive slip ring
FR2811146A1 (fr) * 2000-06-29 2002-01-04 Valeo Equip Electr Moteur Procede pour la realisation de pieces de collecteurs d'alternateurs, notamment pour vehicule automobile
US6625868B2 (en) * 1999-11-09 2003-09-30 Siemens Canada Limited Totally integrated engine cooling module for D.C. motors
US20040121622A1 (en) * 2002-12-20 2004-06-24 Abouchar John W. Slip ring with connector pins
US20070267935A1 (en) * 2006-05-16 2007-11-22 York Michael T Alternator rotor coil wire routing
US20100187946A1 (en) * 2005-06-25 2010-07-29 Orlowski David C Current Diverter Ring
EP2270919A3 (en) * 2003-02-19 2011-04-06 Moog Inc. Broadband high-frequency slip ring system
US20110193446A1 (en) * 2005-06-25 2011-08-11 Orlowski David C Current Diverter Ring
US20110204734A1 (en) * 2005-06-25 2011-08-25 Orlowski David C Motor Grounding Seal
US9048603B2 (en) 2011-04-18 2015-06-02 Inpro/Seal, LLC Current diverter ring
US9071092B2 (en) 2005-06-25 2015-06-30 Inpro/Seal, LLC Current diverter ring
US9831739B2 (en) 2012-06-18 2017-11-28 Inpro/Seal Llc Explosion-proof current diverting device
US20180233994A1 (en) * 2014-12-01 2018-08-16 Mitsubishi Electric Corporation Rotor of rotating electric machine and rotating electric machine

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51137686U (enrdf_load_stackoverflow) * 1975-04-30 1976-11-06
JPS5243090U (enrdf_load_stackoverflow) * 1975-09-20 1977-03-26
FR2431207A1 (fr) * 1978-07-11 1980-02-08 Paris & Du Rhone Perfectionnements aux collecteurs d'alternateurs du type retreint
FR2471682A1 (fr) * 1979-12-12 1981-06-19 Sacre Louis Perfectionnement aux collecteurs tournants a axe vertical
DE3133135C2 (de) * 1981-08-21 1985-06-13 Robert Bosch Gmbh, 7000 Stuttgart Schleifring für elektrische Maschinen
DE3838436C2 (de) * 1988-11-12 2002-09-19 Bosch Gmbh Robert Schleifringanordnung
DE10225789A1 (de) * 2002-06-10 2003-12-18 Bosch Gmbh Robert Verfahren zur Herstellung eines Schleifrings sowie Schleifringvorrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1108940A (en) * 1912-12-06 1914-09-01 Westinghouse Electric & Mfg Co Collector-ring.
US1334276A (en) * 1916-03-31 1920-03-23 Western Electric Co Contact-terminal bank
US1712301A (en) * 1925-03-06 1929-05-07 Roy R Glidden Swivel joint
GB831646A (en) * 1956-04-20 1960-03-30 Ketay Ltd Improvements in or relating to the arrangement of slip rings on the rotor of an electrical machine
US3123421A (en) * 1964-03-03 Rotatable electrical connection
US3636394A (en) * 1970-05-18 1972-01-18 Suhl Elektrogeraete Veb K Elastic contacts for carbon collector rings having insulating bodies in electric motors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123421A (en) * 1964-03-03 Rotatable electrical connection
US1108940A (en) * 1912-12-06 1914-09-01 Westinghouse Electric & Mfg Co Collector-ring.
US1334276A (en) * 1916-03-31 1920-03-23 Western Electric Co Contact-terminal bank
US1712301A (en) * 1925-03-06 1929-05-07 Roy R Glidden Swivel joint
GB831646A (en) * 1956-04-20 1960-03-30 Ketay Ltd Improvements in or relating to the arrangement of slip rings on the rotor of an electrical machine
US3636394A (en) * 1970-05-18 1972-01-18 Suhl Elektrogeraete Veb K Elastic contacts for carbon collector rings having insulating bodies in electric motors

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2322706A1 (fr) * 1975-09-05 1977-04-01 Fischer Artur Ensemble de percage
US4219249A (en) * 1977-08-26 1980-08-26 Motorola, Inc. Ultrasonic welding process for automobile alternator slip rings
US4618793A (en) * 1984-03-23 1986-10-21 Hitachi, Ltd. Rotor for alternators with molded slipring assembly
US4557535A (en) * 1984-09-17 1985-12-10 Whirlpool Corporation Electrical hose swivel connector for canister vacuum cleaner
US5551143A (en) * 1992-11-06 1996-09-03 Ford Motor Company Rotor shaft having lead wire passage slots and method of forming collar support by cold heading
US5327037A (en) * 1992-11-23 1994-07-05 Ford Motor Company Automotive alternator slip ring assembly
US5472647A (en) * 1993-08-02 1995-12-05 Thiokol Corporation Method for preparing anhydrous tetrazole gas generant compositions
US5445528A (en) * 1994-05-31 1995-08-29 The Whitaker Corporation Electrical connector with improved mounting
US5542850A (en) * 1994-06-30 1996-08-06 The Whitaker Corporation Pivotal electrical connector
US5734218A (en) * 1996-05-13 1998-03-31 Litton Systems, Inc. Electrical slip ring and method of manufacturing same
US5886451A (en) * 1997-10-30 1999-03-23 Ford Motor Company Wire routing design for a rotor of an electrical machine
US6625868B2 (en) * 1999-11-09 2003-09-30 Siemens Canada Limited Totally integrated engine cooling module for D.C. motors
US6266876B1 (en) * 1999-11-12 2001-07-31 Litton Systems, Inc. Method of gap filling a conductive slip ring
FR2811146A1 (fr) * 2000-06-29 2002-01-04 Valeo Equip Electr Moteur Procede pour la realisation de pieces de collecteurs d'alternateurs, notamment pour vehicule automobile
US20040121622A1 (en) * 2002-12-20 2004-06-24 Abouchar John W. Slip ring with connector pins
US7001184B2 (en) 2002-12-20 2006-02-21 Unit Industries Slip ring with connector pins
EP2270919A3 (en) * 2003-02-19 2011-04-06 Moog Inc. Broadband high-frequency slip ring system
US8604653B2 (en) 2005-06-25 2013-12-10 Inpro/Seal, LLC Current diverter ring
US20100187946A1 (en) * 2005-06-25 2010-07-29 Orlowski David C Current Diverter Ring
US20110193446A1 (en) * 2005-06-25 2011-08-11 Orlowski David C Current Diverter Ring
US20110204734A1 (en) * 2005-06-25 2011-08-25 Orlowski David C Motor Grounding Seal
US9071092B2 (en) 2005-06-25 2015-06-30 Inpro/Seal, LLC Current diverter ring
US9634547B1 (en) 2005-06-25 2017-04-25 Inpro/Seal Llc Motor grounding seal
US10270320B1 (en) 2005-06-25 2019-04-23 Inpro/Seal Llc Motor grounding seal
US20070267935A1 (en) * 2006-05-16 2007-11-22 York Michael T Alternator rotor coil wire routing
US9048603B2 (en) 2011-04-18 2015-06-02 Inpro/Seal, LLC Current diverter ring
US9525327B2 (en) 2011-04-18 2016-12-20 Inpro/Seal, LLC Current diverter ring
US9614339B2 (en) 2011-04-18 2017-04-04 Inpro/Seal, LLC Current diverter ring
US9831739B2 (en) 2012-06-18 2017-11-28 Inpro/Seal Llc Explosion-proof current diverting device
US20180233994A1 (en) * 2014-12-01 2018-08-16 Mitsubishi Electric Corporation Rotor of rotating electric machine and rotating electric machine

Also Published As

Publication number Publication date
DE2124078A1 (de) 1971-11-25
JPS50488B1 (enrdf_load_stackoverflow) 1975-01-09
DE7118954U (de) 1974-06-27

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