US3808135A - Magnetic slot closure for electrical machines and method of manufacture thereof - Google Patents

Magnetic slot closure for electrical machines and method of manufacture thereof Download PDF

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Publication number
US3808135A
US3808135A US00171616A US17161671A US3808135A US 3808135 A US3808135 A US 3808135A US 00171616 A US00171616 A US 00171616A US 17161671 A US17161671 A US 17161671A US 3808135 A US3808135 A US 3808135A
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US
United States
Prior art keywords
mass
slot
slot closure
magnetic slot
closure
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
US00171616A
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English (en)
Inventor
F Weigel
H Keuth
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens Corp
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
Priority claimed from DE19702041076 external-priority patent/DE2041076C/de
Application filed by Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3808135A publication Critical patent/US3808135A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/48—Fastening of windings on the stator or rotor structure in slots
    • H02K3/487—Slot-closing devices
    • H02K3/493—Slot-closing devices magnetic
    • 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

Definitions

  • a slot closure comprises a mass of epoxide resin, a BF amino adduct, iron powder and a stiifener, which mass is added in a pasty condition, during cold hardening, to a liquid isocyanate compound thickened with indifferent inorganic material.
  • the invention relates to a magnetic slot closure for electrical machines. More particularly, the invention relates to a magnetic slot closure for electrical machines having open slots and a method of manufacture thereof.
  • the slot closure comprises a mass of epoxide resin, a BF amino adduct, iron powder and a stiifener, which mass is added in a pasty condition, during cold hardening to a liquid isocyanate compound thickened with indiiferent inorganic material.
  • German Pat. No. 1,299,357 discloses a magnetic slot closure for electrical machines which comprises a mass of a mixture of epoxide resin, a BF, amino adduct, iron powder and a stiffener.
  • the mass is inserted under pressure in a workable pasty condition through the slot opening into the free space remaining after the insertion of the winding in the slot.
  • the free space extends from the winding up to the slot opening.
  • the mass fills the free space in the slot and also fills the slot opening, and hardens in the slot.
  • the disclosed embodiment of the patent relates to masses which harden only under the influence of heat and reach adequately high hot forming stability up to 190 C.
  • the magnetic slot closure mass may be utilized without difficulty when the respective machines must be subjected to thermal treatment in any case such as, for example, for hardening the impregnation or encapsulation of the winding.
  • thermal treatment in any case such as, for example, for hardening the impregnation or encapsulation of the winding.
  • a simpler installation of the slot closures without heat treatment is desired for machines which have not to be subjected to such thermal processing.
  • the qualities or characteristics of the mass must correspond to those of the hot hardening masses.
  • An object of the invention is to provide a magnetic slot closure mass which overcomes the disadvantages of known magnetic slot closure masses.
  • Another object of the invention is to provide a magnetic slot closure mass which is cold hardened.
  • Another object of the invention is to provide a method of manufacture of a magnetic slot closure which overcomes the disadvantages of known magnetic slot closures and which is cold hardened.
  • the magnetic slot closure mass in pasty condition has added to it a liquid isocyanate compound thickened with indifferent inorganic material, the mixture then being cold hardened.
  • a magnetic slot closure for an electrical machine having a slot having a winding therein, an opening and free space above the winding up to the opening includes a mass filling the free space in the slot and the opening thereof.
  • the mass comthickened with indiiferent inorganic material added to' the mass.
  • the mass contains at least weight percent of iron powder, about 5 weight percent of highly dispersible titanium dioxide, about 5 weight percent of quartz meal, at least 10 weight percent of cycloaliphatic epoxide resin having an epoxide equivalent of 134, about half the remainder being BF N methylcyclohexylamine and diphenylmethane-4,4'-diisocyanate.
  • a method of producing a slot closure for an electrical machine having a slot having a winding therein, an opening and free space above the winding up to the opening comprises inserting into the slot through the opening thereof under pressure and in a workable pasty condition, a mass of a mixture of epoxide resin, a BF amino adduct, iron powder and a stiffener until the mass fills the free space and the opening of the slot, and adding to the mass for cold-hardening a liquid isocyanate compound thickened with indifferent inorganic material.
  • the method of producing a slot closure comprises first thoroughly mixing the epoxide resin and the iron powder, then adding a mixture of quartz meal and the isocyanate compound, and then adding a mixture of an equal volume of quartz meal and the amino adduct.
  • FIG. 1 is a sectional view of the magnetic slot closure of the invention installed in a slot of an electrical machine
  • FIG. 2 is a flow chart of the method of manufacture of the magnetic slot closure of the invention.
  • a winding 11 is placed in a slot 12 of an electrical machine 13.
  • the free space from the top of the winding 11 to the opening 14 of the slot is filled with the magnetic slot closure mass 15 of the invention.
  • a magnetic slot closure mass having especially rapid hardening character istics comprises at least 75 weight percent of iron powder, about 5 weight percent of highly dispersible titanium 'dioxide, utilized as a stiffener, about 5 weight percent of quartz meal, at least 10 weight percent cycloaliphati'c epoxide resin having an epoxide equivalent of 134. The remainder comprises about half BF 'N methylcyclohexylamine and diphenylrnethane-4,4'-diisocyanate.
  • the magnetic slot closure mass Prior to its insertion in the slot 12, the magnetic slot closure mass is produced in accordance with the flow chart of FIG. 2. As indicated in FIG. 2, the epoxide resin is first mixed with the iron powder. Thereafter, half the amount of quartz meal is mixed with the isocyanate co!n-. pound and the mixture is added to the mixture of epoxide resin and iron powder. Finally, the other half volume of quartz meal is mixed with the amino adduct and the mixture is added to the other ingredients.
  • the mass attains a rigidity or bending strength of about 250 kp./cm. in two days.
  • the rigidity or bending strength increases to approximately 600 kp./cm. after about sixteen hours at C.
  • the thermal expansion or stress coeflicient of the cold'hardem ing mass in accordance with the invention corresponds to that of known hot hardening masses so that a simple and reliable repair of damaged slot closures of hot hardene masses is possible.
  • the mass of the invention may easily be pressed into the slot and is so hardened by pressure that it will not blow out in an unhardened condition.
  • a magnetic slot closure for an electrical machine having a slot having a winding therein, an opening and free space above the winding, said slot closure including a mass filling the free space in the slot and the opening thereof, said mass comprising at least 75 weight percent of iron powder, about 5 weight percent of highly dispersible titanium dioxide, about 5 weight percent of quartz powder, at least weight percent of cycloaliphatic epoxide resin having an epoxide equivalent of 134, about half powder, at least 10 weight percent of cycloaliphatic epoxide resin having an epoxide equivalent of 134, about half the remainder being BF N methylcyclohexylamine and diphenylmethane-4,4-diisocyanate.
  • a method of producing a slot closure as claimed in claim 2 comprising first thoroughly mixing said epoxide resin and said iron powder, then adding a mixture of quartz powder and said diphenylmethane-4,4'-diisocyanate, and then adding a mixture of an equal volume 0i quartz'powder and said BF3N methylcyclohexylamine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Sealing Material Composition (AREA)
  • Polyurethanes Or Polyureas (AREA)
US00171616A 1970-08-19 1971-08-13 Magnetic slot closure for electrical machines and method of manufacture thereof Expired - Lifetime US3808135A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702041076 DE2041076C (de) 1970-08-19 Magnetischer Nutverschluß aus einer härtbaren Kunstharzmasse und Verfahren zur Herstellung der Masse

Publications (1)

Publication Number Publication Date
US3808135A true US3808135A (en) 1974-04-30

Family

ID=5780108

Family Applications (1)

Application Number Title Priority Date Filing Date
US00171616A Expired - Lifetime US3808135A (en) 1970-08-19 1971-08-13 Magnetic slot closure for electrical machines and method of manufacture thereof

Country Status (9)

Country Link
US (1) US3808135A (enrdf_load_stackoverflow)
JP (1) JPS5138404B1 (enrdf_load_stackoverflow)
AT (1) AT303183B (enrdf_load_stackoverflow)
BE (1) BE771393R (enrdf_load_stackoverflow)
FR (1) FR2104500A6 (enrdf_load_stackoverflow)
GB (1) GB1360434A (enrdf_load_stackoverflow)
IT (1) IT987545B (enrdf_load_stackoverflow)
NL (1) NL7108808A (enrdf_load_stackoverflow)
SE (1) SE364824B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932929A (en) * 1973-09-28 1976-01-20 Skf Industrial Trading And Development Company, B.V. Method of making a sectioned stator for a dynamoelectric machine
US3940798A (en) * 1974-09-30 1976-02-24 Rumpler Allen G Core structure with L-shaped back member and magnetic bonding material
US4600323A (en) * 1984-01-25 1986-07-15 Hitachi, Ltd. Printing head assembly
US4724243A (en) * 1986-12-29 1988-02-09 United Technologies Automotive, Inc. Hot melt magnetic sealant, method of making and method of using same
US4749434A (en) * 1986-12-29 1988-06-07 United Technologies Automotive, Inc. Hot melt magnetic sealant, method of making and method of using same
US5680692A (en) * 1994-10-03 1997-10-28 General Electric Company Fabrication of induction motors
US5990588A (en) * 1996-12-13 1999-11-23 General Electric Company Induction motor driven seal-less pump
EP4485759A1 (de) * 2023-06-28 2025-01-01 Siemens Aktiengesellschaft Nutfüllung mittels zweikomponentigem duromer-system bei elektrischer maschine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932929A (en) * 1973-09-28 1976-01-20 Skf Industrial Trading And Development Company, B.V. Method of making a sectioned stator for a dynamoelectric machine
US3940798A (en) * 1974-09-30 1976-02-24 Rumpler Allen G Core structure with L-shaped back member and magnetic bonding material
US4600323A (en) * 1984-01-25 1986-07-15 Hitachi, Ltd. Printing head assembly
US4724243A (en) * 1986-12-29 1988-02-09 United Technologies Automotive, Inc. Hot melt magnetic sealant, method of making and method of using same
US4749434A (en) * 1986-12-29 1988-06-07 United Technologies Automotive, Inc. Hot melt magnetic sealant, method of making and method of using same
US5680692A (en) * 1994-10-03 1997-10-28 General Electric Company Fabrication of induction motors
US5793138A (en) * 1994-10-03 1998-08-11 General Electric Company Fabrication of induction motors
US5990588A (en) * 1996-12-13 1999-11-23 General Electric Company Induction motor driven seal-less pump
US6274962B1 (en) 1996-12-13 2001-08-14 General Electric Company Induction motor driven seal-less pump
US6578251B2 (en) 1996-12-13 2003-06-17 General Electric Company Method of fabrication of an induction motor driven seal-less pump
EP4485759A1 (de) * 2023-06-28 2025-01-01 Siemens Aktiengesellschaft Nutfüllung mittels zweikomponentigem duromer-system bei elektrischer maschine
WO2025002775A1 (de) * 2023-06-28 2025-01-02 Innomotics Gmbh Nutfüllung mittels zweikomponentigem duromer-system bei elektrischer maschine

Also Published As

Publication number Publication date
BE771393R (fr) 1971-12-31
NL7108808A (enrdf_load_stackoverflow) 1972-02-22
JPS5138404B1 (enrdf_load_stackoverflow) 1976-10-21
IT987545B (it) 1975-03-20
GB1360434A (en) 1974-07-17
SE364824B (enrdf_load_stackoverflow) 1974-03-04
DE2041076B2 (de) 1973-02-22
FR2104500A6 (enrdf_load_stackoverflow) 1972-04-14
AT303183B (de) 1972-11-10
DE2041076A1 (de) 1972-02-24

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