CH534449A - Magnetic sealing material - consisting of epoxide resin , boron trifluoride - Google Patents
Magnetic sealing material - consisting of epoxide resin , boron trifluorideInfo
- Publication number
- CH534449A CH534449A CH885771A CH885771A CH534449A CH 534449 A CH534449 A CH 534449A CH 885771 A CH885771 A CH 885771A CH 885771 A CH885771 A CH 885771A CH 534449 A CH534449 A CH 534449A
- Authority
- CH
- Switzerland
- Prior art keywords
- mass
- iron powder
- weight
- powder
- epoxy resin
- Prior art date
Links
- 239000003822 epoxy resin Substances 0.000 title claims abstract description 8
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 8
- 239000003566 sealing material Substances 0.000 title abstract 2
- WTEOIRVLGSZEPR-UHFFFAOYSA-N boron trifluoride Chemical compound FB(F)F WTEOIRVLGSZEPR-UHFFFAOYSA-N 0.000 title 2
- 229910015900 BF3 Inorganic materials 0.000 title 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000010453 quartz Substances 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 239000012948 isocyanate Substances 0.000 claims abstract description 5
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 5
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims abstract description 3
- PAMIQIKDUOTOBW-UHFFFAOYSA-N N-methylcyclohexylamine Natural products CN1CCCCC1 PAMIQIKDUOTOBW-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 12
- 239000003351 stiffener Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 4
- 235000011837 pasties Nutrition 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 2
- 239000011353 cycloaliphatic epoxy resin Substances 0.000 claims description 2
- 229910010272 inorganic material Inorganic materials 0.000 claims description 2
- 239000011147 inorganic material Substances 0.000 claims description 2
- 239000011872 intimate mixture Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 235000013312 flour Nutrition 0.000 claims 1
- -1 BF3 amine Chemical class 0.000 abstract description 2
- XTUVJUMINZSXGF-UHFFFAOYSA-N N-methylcyclohexylamine Chemical compound CNC1CCCCC1 XTUVJUMINZSXGF-UHFFFAOYSA-N 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 150000002118 epoxides Chemical class 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000011368 organic material Substances 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000004848 polyfunctional curative Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- DBIWHDFLQHGOCS-UHFFFAOYSA-N piperidine;trifluoroborane Chemical class FB(F)F.C1CCNCC1 DBIWHDFLQHGOCS-UHFFFAOYSA-N 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Magnetic sealing material for elecrical machines consists of a plate contg. an epoxide resin, a BF3 amine inclusing cpd. iron powder and a coil curing agent consisting of a liquid isocyanate thickened with inert organic material. - Specif. the material contains at least 75% wt. iron powder, 5% wt. TiO2, 5% wt quartz powder and at least 10% wt. cycloaliphatic epoxide resin (epoxide equivalent 134), the remainder consisting of equal pts. wt. of BF3.N-methylcyclohexylamine and diphenylmethane-4,4'-diisocyanate.
Description
Das Hauptpatent betrifft einen magnetischen Nutver- schluss an einer elektrischen Maschine, der aus einer in der Nut gehärteten Mischung von Kunstharz und Eisenpulver be steht, und ein Verfahren zur Herstellung eines solchen Nut verschlusses, bei dem Eisenpulver mit einem mit Härter ver setzten flüssigen Kunstharz zu einer Masse vermischt wird und die Masse im ungehärteten Zustand in die freien Räume der mit der Wicklung belegten offenen Nuten so einge bracht wird, dass eine innige Verbindung mit den benachbar ten Zahnkopfflanken entsteht.
Bei den bei normaler Tempera tur pastenförmigen Mischungen kann es jedoch vorkommen, dass die Mischung bei der zum Aushärten notwendigen Tem peratur in einen fliessfähigen Zustand gerät und unter Um ständen aus der Nut wieder auslaufen kann, bevor der Aus- härtungsprozess beendet ist. Dies kann beim Verfahren nach dem Zusatzpatent 446 506 dadurch vermieden werden, dass der pastenförmigen Mischung von heisshärtendem Epoxid- harz und Eisenpulver, die nach dem Einbringen in die Nut in dieser ausgehärtet wird, ein Steifmacher beigemengt wird.
Dabei ist als besonders günstig eine Mischung genannt, die ein BF3 - Amin-Addukt in Form eines Bortrifluorid-Piperidin- Komplexes als Härter enthält. Solche Mischungen härten nur unter Einwirkung von Wärme aus und erreichen dabei ausreichend hohe Warmformbeständigkeit bis zu 190 C. Sie können ohne Schwierigkeiten angewendet werden, wenn die Maschinen ohnehin einer Wärmebehandlung unterzogen wer den müssen, z. B. zum Aushärten der Wicklungsimprägnie rung.
Bei Maschinen, die einer solchen Wärmebehandlung an sich nicht ausgesetzt zu werden brauchen, ist ein einfacheres Anbringen der Nutverschlüsse ohne Erwärmung, d. h. eine Kalthärtung, erwünscht, wobei ihre Eigenschaften denen heisshärtender Mischungen entsprechen müssen.
Die Lösung der Aufgabe gelingt nach der Erfindung. Diese besteht in einem Verfahren zur Herstellung eines ma gnetischen Nutverschlusses an einer elektrischen Maschine durch Zubereitung einer Epoxidharz, BF3 - Amin-Addukt, Eisenpulver und Steifmacher enthaltenden, pastenförmigen härtbaren Masse, Einpressen dieser Masse in den freien Raum der mit der Wicklung belegten Nut und Aushärten der Masse in der Nut, das dadurch gekennzeichnet ist, dass zur Herstellung der pastenförmigen, härtbaren Masse mit in differentem anorganischem Material angedicktes flüssiges Isocyanat mitverwendet wird.
Die erfindungsgemäss zubereitete härtbare Masse hat eine besonders kurze Aushärtezeit, wenn sie mindestens 75 Gew: % Eisenpulver, je etwa 5 Gew: /o hochdisperses Titan- dioxid (Steifmacher) und Quarzmehl und mindestens 10 Gew: % cycloaliphatisches Epoxidharz (Epoxidäquivalentge- wicht 134) enthält, und der Rest der Masse je etwa hälftig aus BF3 - N-Methylcyclohexylamin-Addukt sowie Diphenylme- than-4,4'-diisocyanat besteht.
Die Nutverschlussmasse kann unter Verwendung von Quarzmehl als Steifmacher so hergestellt werden, dass einer innigen Mischung aus Epoxidharz und Eisenpulver das mit der einen Hälfte des Quarzmehls angedickte flüssige Isocya- pat und danach eine Mischung aus der anderen Hälfte des Quarzmehls und dem BF3 - Amin-Addukt zugerührt wird.
Bei Raumtemperatur kann die Mischung nach zwei Tagen eine Biegefestigkeit von ca. 250 kp/cm2 ereichen, die bei 80 C nach etwa 16 Stunden auf ca. 600 kp/cm' ansteigen kann. Die Wärmedehnungszahl kann der der bekannten heiss- härtenden Nutverschlüsse entsprechen, so dass beispiels weise eine einfache und zuverlässige Reparatur beschädigter Nutverschlüsse aus heisshärtenden Massen mit solchen kalt härtenden Mischungen möglich ist.
Die Mischung lässt sich leicht in die Nuten einpressen und kann durch das Pressen so verfestigt werden, dass sie im noch nicht ausgehärteten Zustand nicht ausfliesst. Die Warmformbeständigkeit kann durch Leerlauf der Maschine, bei dem eine Temperatur von etwa 80 C auftritt, nach 16 Stunden auf etwa 175 C gesteigert werden.
The main patent relates to a magnetic slot lock on an electrical machine, which consists of a mixture of synthetic resin and iron powder hardened in the slot, and a method for producing such a slot lock in which iron powder is added with a liquid synthetic resin mixed with hardener a mass is mixed and the mass in the unhardened state is brought into the free spaces of the open slots occupied by the winding in such a way that an intimate connection with the neighboring tooth tip flanks is created.
In the case of mixtures which are paste-like at normal temperature, however, it can happen that the mixture becomes a flowable state at the temperature required for curing and may leak out of the groove again before the curing process is complete. This can be avoided in the method according to the additional patent 446 506 by adding a stiffener to the paste-like mixture of hot-curing epoxy resin and iron powder, which is cured in the groove after it has been introduced.
A mixture that contains a BF3 amine adduct in the form of a boron trifluoride-piperidine complex as a hardener is mentioned as being particularly favorable. Such mixtures cure only under the action of heat and achieve a sufficiently high heat distortion resistance of up to 190 C. They can be used without difficulty if the machines have to undergo heat treatment anyway, e.g. B. to harden the winding impregnation tion.
In the case of machines which do not need to be subjected to such a heat treatment per se, a simpler application of the slot seals without heating, i.e. H. cold hardening is desirable, whereby its properties must correspond to those of hot-hardening mixtures.
The object is achieved according to the invention. This consists of a process for producing a magnetic slot seal on an electrical machine by preparing a paste-like hardenable compound containing epoxy resin, BF3 - amine adduct, iron powder and stiffening agent, pressing this compound into the free space of the slot occupied by the winding and curing the mass in the groove, which is characterized in that liquid isocyanate thickened in different inorganic material is also used to produce the pasty, curable mass.
The curable mass prepared according to the invention has a particularly short hardening time if it contains at least 75% by weight of iron powder, about 5% by weight each of highly disperse titanium dioxide (stiffening agent) and quartz powder and at least 10% by weight of cycloaliphatic epoxy resin (epoxy equivalent weight 134) contains, and the remainder of the mass consists of BF3 - N-methylcyclohexylamine adduct and diphenylmethane-4,4'-diisocyanate.
The groove sealing compound can be produced using quartz powder as a stiffener so that the liquid isocyanate thickened with one half of the quartz powder and then a mixture of the other half of the quartz powder and the BF3 - amine adduct is produced using an intimate mixture of epoxy resin and iron powder is added.
At room temperature, the mixture can reach a flexural strength of approx. 250 kp / cm2 after two days, which at 80 C can increase to approx. 600 kp / cm after approx. 16 hours. The coefficient of thermal expansion can correspond to that of the known hot-curing slot seals, so that, for example, a simple and reliable repair of damaged slot seals made from hot-curing compounds with such cold-curing mixtures is possible.
The mixture can easily be pressed into the grooves and can be solidified by pressing so that it does not flow out in the not yet hardened state. The heat resistance can be increased to about 175 C after 16 hours by idling the machine at a temperature of about 80 ° C.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES89996A DE1288186B (en) | 1964-03-13 | 1964-03-13 | Magnetic slot lock for electrical machines |
| DE19702041076 DE2041076C (en) | 1970-08-19 | Magnetic slot lock made from a hardenable synthetic resin compound and method for producing the compound |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH534449A true CH534449A (en) | 1973-02-28 |
Family
ID=25759603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH885771A CH534449A (en) | 1964-03-13 | 1971-06-17 | Magnetic sealing material - consisting of epoxide resin , boron trifluoride |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH534449A (en) |
-
1971
- 1971-06-17 CH CH885771A patent/CH534449A/en not_active IP Right Cessation
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PL | Patent ceased |