DE1087262B - Arrangement to reduce the eddy current losses in pressure bodies made of ferromagnetic material for transformer windings u. like - Google Patents
Arrangement to reduce the eddy current losses in pressure bodies made of ferromagnetic material for transformer windings u. likeInfo
- Publication number
- DE1087262B DE1087262B DEL28585A DEL0028585A DE1087262B DE 1087262 B DE1087262 B DE 1087262B DE L28585 A DEL28585 A DE L28585A DE L0028585 A DEL0028585 A DE L0028585A DE 1087262 B DE1087262 B DE 1087262B
- Authority
- DE
- Germany
- Prior art keywords
- arrangement
- eddy current
- ferromagnetic material
- current losses
- transformer windings
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/303—Clamping coils, windings or parts thereof together
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
- H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Regulation Of General Use Transformers (AREA)
Description
Anordnung zur Verminderung der Wirbelstromverluste in aus ferromagnetischem Material bestehenden Druckkörpern für Transformatorwicklungen u. dgl. Es ist bekannt, daß bei Zylinderwicklungen die Streulinien im wesentlichen axial verlaufen. Der aus dem Streukanal austretende Streufluß durchsetzt somit die den Wicklungsabschluß bildenden Druckkörper, die zur Verspannung der Wicklung gegen die in axialer Richtung wirkenden Kräfte dienen, in normaler Richtung, also senkrecht zur Ebene dieser Druckkörper, die meist als Ringe aus ferromagnetischem Material ausgeführt sind. Demzufolge entstehen - in den Druckkörpern beträchtliche Wirbelstromverluste, die eine Erhöhung der Kurzschlußverluste des Transformators bewirken. Um diese zusätzlichen Verluste möglichst weitgehend zu vermeiden, wird erfindungsgemäß vorgeschlagen, Druckkörper und Kernschenkel magnetisch miteinander zu verbinden. Dies geschieht zweckmäßigerweise dadurch, daß man den oder die Druckkörper unmittelbar an den Kernschenkeln anliegen läßt oder zusätzliche magnetische Verbindungen zwischen den Druckkörpern und den Kernschenkeln vorsieht. Unter Umständen läßt sich der magnetische Widerstand zwischen Druckkörpern und Kernschenkeln auch schon durch entsprechende Verringerung des Luftspalts zwischen diesen Teilen auf einen hinreichenden Wert verringern. Durch diese Maßnahmen wird erreicht, daß der Streufluß den oder die Druckkörper überwiegend in tangentialer Richtung durchsetzt, so daß der für die Ausbildung von Wirbelströmen zur Verfügung stehende Querschnitt senkrecht zur Richtung des Streuflusses erheblich verringert wird. Dieser Querschnitt kann weiterhin noch dadurch verkleinert werden, daß unmittelbar unter dem Druckkörper in an sich bekannter Weise eine lamellierte Schicht aus dünnen, voneinander isolierten Eisenblechen, z. B. Elektroblechen, eingefügt wird.Arrangement to reduce eddy current losses in ferromagnetic Material existing pressure hulls for transformer windings and the like. It is known that in the case of cylinder windings, the scatter lines run essentially axially. Of the The leakage flux emerging from the leakage channel thus penetrates the winding termination forming pressure body, which is used to brace the winding against the axial direction acting forces are used in the normal direction, i.e. perpendicular to the plane of this pressure body, which are usually designed as rings made of ferromagnetic material. As a result arise - Considerable eddy current losses in the pressure hulls, which increase short-circuit losses of the transformer. To these additional losses as much as possible to avoid, it is proposed according to the invention that the pressure body and core limb are magnetic to connect with each other. This is conveniently done by the or the pressure body can rest directly on the core legs or additional ones provides magnetic connections between the pressure hulls and the core legs. Under certain circumstances, the magnetic resistance between pressure hulls and core legs can be reduced also by reducing the air gap between these parts accordingly reduce to a sufficient value. Through these measures it is achieved that the leakage flux penetrates the pressure body (s) predominantly in a tangential direction, so that the cross section available for the formation of eddy currents perpendicular to the direction of the leakage flux is significantly reduced. This cross section can still be reduced in size by being immediately below the pressure hull in a manner known per se, a laminated layer of thin, isolated from one another Iron sheets, e.g. B. electrical steel is inserted.
Es ist weiterhin bekannt, Wirbelstromverluste in massiven, einem Streufluß ausgesetzten Metallteilen dadurch zu vermeiden oder zumindest klein zu halten, daß die Streulinien durch besondere Mittel abgefangen werden. Es. handelt sich hierbei um eine Abschirmung der fraglichen Metallteile, wobei die vom Streufluß durchsetzten Metallteile selbst als Schirm ausgebildet werden können oder vor diese Metallteile elektrisch oder magnetisch gut leitende Metallschirme gelegt werden.It is also known to have eddy current losses in massive, a leakage flux to avoid exposed metal parts or at least to keep them small that the scatter lines are intercepted by special means. It. is here to shield the metal parts in question, with those penetrated by the leakage flux Metal parts themselves can be designed as a screen or in front of these metal parts electrically or magnetically conductive metal screens are placed.
Demgegenüber weist die Erfindung einen anderen Weg dadurch, daß der magnetische Fluß in diesen Teilen so geführt wird, daß der vom Streufluß durchsetzte Querschnitt möglichst klein ist. Die magnetisch gut leitende Verbindung zwischen Druckkörper und Kernschenkel ist somit hierbei nicht als Schirm anzusehen.In contrast, the invention has another way in that the magnetic flux in these parts is guided so that the leakage flux penetrated Cross-section is as small as possible. The magnetically highly conductive connection between The pressure hull and core leg are therefore not to be regarded as a screen.
Die Erfindung sei an Hand eines schematisch dargestellten Ausführungsbeispiels noch näher erläutert. Dabei zeigt Fig. 1 die Anordnung einer Zylinderspule 10 um den Kern 11. 12 ist der Streukanal, durch den der Streufluß 13 im wesentlichen in axialer Richtung hindurchtritt und den Druckring 14 senkrecht zur Ringebene durchsetzt. Fig. 2 zeigt eine Draufsicht auf die in Fig. 1 dargestellte Anordnung und läßt die gestrichelt angedeuteten Wirbelstrombahnen erkennen. Sieht man nun, wie Fig.3 zeigt, in dem in Fig.1 mit 15 bezeichneten Luftspalt zusätzliche magnetische Einlagen 16 vor, oder reduziert man den Luftspalt auf einen erheblich geringeren Wert, so wird erreicht, daß der Streufluß infolge des kleineren magnetischen Widerstands zwischen Druckkörper und Kernschenkel im wesentlichen in tangentialer Richtung verläuft. In Fig. 4 ist schließlich noch eine unterhalb der Druckplatte befindliche lamellierte Schicht 17 aus Transformatorenbleeh veranschaulicht, die, wie bereits erwähnt, eine weitere Verringerung des Querschnitts für die Wirbelströme bewirkt.The invention is based on a schematically illustrated embodiment explained in more detail. 1 shows the arrangement of a solenoid 10 μm the core 11. 12 is the stray channel through which the stray flux 13 is essentially in passes through the axial direction and penetrates the pressure ring 14 perpendicular to the plane of the ring. Fig. 2 shows a plan view of the arrangement shown in Fig. 1 and leaves the recognize eddy current paths indicated by dashed lines. If you now see, as Fig. 3 shows, In the air gap designated by 15 in FIG. 1, additional magnetic inserts 16 before, or if the air gap is reduced to a considerably lower value, then achieved that the leakage flux due to the smaller magnetic resistance between Pressure body and core leg runs essentially in the tangential direction. Finally, in FIG. 4 there is also a lamella located below the pressure plate Layer 17 of transformer sheet illustrates which, as already mentioned, a causes further reduction in the cross section for the eddy currents.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL28585A DE1087262B (en) | 1957-09-12 | 1957-09-12 | Arrangement to reduce the eddy current losses in pressure bodies made of ferromagnetic material for transformer windings u. like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL28585A DE1087262B (en) | 1957-09-12 | 1957-09-12 | Arrangement to reduce the eddy current losses in pressure bodies made of ferromagnetic material for transformer windings u. like |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1087262B true DE1087262B (en) | 1960-08-18 |
Family
ID=7264575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEL28585A Pending DE1087262B (en) | 1957-09-12 | 1957-09-12 | Arrangement to reduce the eddy current losses in pressure bodies made of ferromagnetic material for transformer windings u. like |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1087262B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2425138A1 (en) * | 1978-05-02 | 1979-11-30 | Asea Ab | FLOW CONTROL IN RIBBON WINDINGS |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH136140A (en) * | 1927-04-08 | 1929-10-31 | Bbc Brown Boveri & Cie | Device for reducing losses in transformers with a large spread. |
CH146083A (en) * | 1929-04-19 | 1931-03-31 | Bbc Brown Boveri & Cie | Device to reduce losses due to stray fields in oil transformers. |
-
1957
- 1957-09-12 DE DEL28585A patent/DE1087262B/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH136140A (en) * | 1927-04-08 | 1929-10-31 | Bbc Brown Boveri & Cie | Device for reducing losses in transformers with a large spread. |
CH146083A (en) * | 1929-04-19 | 1931-03-31 | Bbc Brown Boveri & Cie | Device to reduce losses due to stray fields in oil transformers. |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2425138A1 (en) * | 1978-05-02 | 1979-11-30 | Asea Ab | FLOW CONTROL IN RIBBON WINDINGS |
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