EP0571242A1 - Magnetkreis mit Luftspalt, insbesondere für Vorschaltgeräte für Entladungslampen und Verfahren zu seiner Herstellung - Google Patents
Magnetkreis mit Luftspalt, insbesondere für Vorschaltgeräte für Entladungslampen und Verfahren zu seiner Herstellung Download PDFInfo
- Publication number
- EP0571242A1 EP0571242A1 EP93401167A EP93401167A EP0571242A1 EP 0571242 A1 EP0571242 A1 EP 0571242A1 EP 93401167 A EP93401167 A EP 93401167A EP 93401167 A EP93401167 A EP 93401167A EP 0571242 A1 EP0571242 A1 EP 0571242A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheets
- shaped
- extensions
- magnetic
- magnetic circuit
- 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.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 238000004804 winding Methods 0.000 claims abstract description 4
- 230000003071 parasitic effect Effects 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims description 3
- 239000000696 magnetic material Substances 0.000 claims 1
- 238000003475 lamination Methods 0.000 abstract 4
- 230000006698 induction Effects 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F3/14—Constrictions; Gaps, e.g. air-gaps
-
- 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
- H01F27/24—Magnetic cores
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
Definitions
- the present invention relates to a magnetic air gap circuit composed of a pack of T-shaped sheets, two packets of L-shaped sheets, a winding surrounding the vertical bar of the T, and an air gap in the extension of the vertical bar of T.
- Such magnetic circuits are known per se.
- the object of the invention is such a magnetic circuit of reduced size, and therefore with a strong magnetic field intensity, the noise level of which is particularly low.
- Another object, linked to the previous one, is a significant reduction, compared to known circuits, of the dispersion fields at the location of the joints of the sheet metal bundles, generally due to local saturation of the iron.
- Figure 1 is a cross section of a magnetic circuit according to the invention.
- FIG. 2 represents a detailed view of an execution according to a prior technique.
- Figure 3 shows a detail view of Figure 1.
- Figure 4 is a cutting plane of a sheet.
- a magnetic circuit comprises a package 1 of T-shaped sheets and two packages 2 and 3 of L-shaped sheets.
- the vertical bar of the T-shaped sheet package is surrounded by a coil 4.
- the latter is protected by a sheet of insulating material 5 wrapped around it.
- This sheet may in particular be made of paper.
- the two packets of L-shaped sheet are applied on the one hand, with a parasitic air gap 6 or 7 as small as possible, against the horizontal bar of the pack of T-shaped sheets and on the other hand define an air gap 8 in the extension of the vertical bar of this T-shaped package.
- a small air gap 9 between the two packages 2 and 3 of L-shaped sheets may remain, without presenting any drawbacks.
- This small air gap 9 guarantees excellent application of the L-shaped sheets against the ends of the horizontal bars of the T-shaped sheets, thereby reducing parasitic air gaps 6 and 7 at the bare minimum.
- each T-shaped sheet has two nose-shaped extensions 10 and 11 directed towards the bottom of the T, shaped to be applied against the L-shaped sheets, respectively 2 and 3, and thus straighten the parasitic joints or air gaps 6 and 7 between the L-shaped sheets and the T-shaped sheets.
- the material necessary for these extensions 10 and 11 preferably comes from an appropriate cutting of a strip of sheet metal for the T and is then taken at the location of a notch 12 in the middle of the base of the vertical bar of the T.
- the extensions 10 and 11 may be identical between them, or as shown in FIG. 1, may be a little different relative to each other. In this case, this difference is due to technical considerations of stamping in order to avoid with certainty harmful burrs on the coil 4.
- the width of the air gap 8 can be made easily adjustable according to a technique known per se, thanks to a non-magnetic ring 13 and capable of plastic deformation.
- This rod 13 is disposed in the notch 12.
- the pack 1 of the T-sheets is pressed against all of the packs 2 and 3 of the L-sheets, by slightly crushing the rod 13 until the air gap 8 reaches the length which corresponds to the desired reactance value.
- the extensions 10 and 11 slide along the L-shaped sheets, while keeping the parasitic air gaps 6 and 7 to a minimum.
- the extensions 10 and 11 of the horizontal bars of the sheets 1 ′ in T are not provided, as shown in FIG. 2.
- the parasitic air gap 6 ′ is substantially shorter than the parasitic air gap 6 corresponding according to FIG. 1 or 3.
- the parasitic air gap 6 or 6 ′ although reduced to a small fraction of a millimeter by the tightening of the L-shaped packages on the T-shaped package, remains nevertheless sufficient to develop a difference in magnetomotor potential (expressed in ampere-turns) greater than the difference in magnetomotor potential over one or a few millimeters in the magnetic sheet.
- this effect causes an accentuated local saturation in the vicinity of the end of the air gap 6 ', winding side 4', with the consequence that the ampere-turns of saturation of the magnetic circuit can increase significantly, since at the said location, the magnetic field can easily reach 10 to 20 times the normal value.
- This phenomenon is further accentuated by the fact that the flow section of the flow undergoes at the place noted 16 a narrowing causing a reduction of 20% to 30% of the passage section, hence an increase in the average induction in this section.
- the passage section at the location indicated 17 is not smaller than the normal passage section in the sheet 2 in L or in the sheet 1 in T, or is only a little smaller than the latter.
- the average induction at said location 17 is therefore approximately equal to the average induction in the neighboring sections located further in the sheet 2 in L or in the sheet 1 in T.
- the presence of the nose 10 avoids the local accumulation of the flux lines and therefore the local increase in the magnetic field in the sheet 2 in L in the vicinity of the lower end of the parasitic air gap 6. It follows that in the version according to the invention, any local magnetic saturation is avoided.
- the shape of the nose-shaped extensions 10 and 11 will be chosen so that their presence will have the effect of effectively increasing the length of the parasitic joints or air gaps 6 and 7.
- the extensions 10 and 11 will locally increase the width of the sheet 1 in T at the end of its two horizontal arms and will decrease the value of the magnetic induction there.
- the device according to the invention makes it possible to reduce the saturation ampere-turns up to 25% in preheating mode.
- the dimensions of the nose-shaped extensions 10 and 11 are preferably between the following values: length contiguous to the parasitic joints or air gaps 6 and 7: between 10% and 30% of the width of the horizontal bar of the T; width of their base: between 15% and 35% of the width of the horizontal bar of the T.
- FIG. 4 a strip of sheet metal 18 is shown in which T-shaped sheets 19, 20, 21 are cut by stamping.
- FIG. 2 shows how it is possible, during a manufacturing process, to take the material necessary for the extensions 10 and 11 at the location of the notch 10 at the base of the vertical bar of the T. These extensions 10 and 11 therefore do not require any additional expenditure on magnetic sheet.
- the T-shaped sheets include in their axis of symmetry a small notch 22 at the location of the horizontal bar.
- the rounds for cutting the L-shaped bars define a small notch 23, corresponding to the notch 22, in the extension of the air gap 9.
- These notches 22 and 23 are intended to provide narrow channels between the iron packet and the clamping sheath, not shown, which surrounds it. These channels running along the iron pack allow an impregnation of this iron pack in order to avoid vibrations which could be manifested by annoying noises.
- the section of these channels must be sufficiently large to allow the impregnator to be able to penetrate therein, but as narrow as possible so that the impregnant penetrates there slowly and permeates the whole uniformly and by capillarity. magnetic circuit.
- the section of these channels is around 0.5 mm 2.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP93401167A EP0571242A1 (de) | 1992-05-21 | 1993-05-05 | Magnetkreis mit Luftspalt, insbesondere für Vorschaltgeräte für Entladungslampen und Verfahren zu seiner Herstellung |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP92401402 | 1992-05-21 | ||
| EP92401402 | 1992-05-21 | ||
| EP93401167A EP0571242A1 (de) | 1992-05-21 | 1993-05-05 | Magnetkreis mit Luftspalt, insbesondere für Vorschaltgeräte für Entladungslampen und Verfahren zu seiner Herstellung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0571242A1 true EP0571242A1 (de) | 1993-11-24 |
Family
ID=26132374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93401167A Withdrawn EP0571242A1 (de) | 1992-05-21 | 1993-05-05 | Magnetkreis mit Luftspalt, insbesondere für Vorschaltgeräte für Entladungslampen und Verfahren zu seiner Herstellung |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0571242A1 (de) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2110357A1 (es) * | 1995-05-05 | 1998-02-01 | Luminotecnicas Especial | Procedimiento de fabricacion de nucleos magneticos para reactancias y transformadores. |
| ES2196973A1 (es) * | 2001-09-14 | 2003-12-16 | Nucleos Magneticos S A | Circuito magnetico para transformadores. |
| EP1575065A3 (de) * | 2004-03-12 | 2008-07-09 | Vossloh-Schwabe Deutschland GmbH | Kernblech für induktives Bauelement |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2367340A1 (fr) * | 1976-10-11 | 1978-05-05 | Helvar Oy | Noyau de fer pour une auto-inductrice ou un transformateur et son procede de fabrication |
| EP0024319A1 (de) * | 1979-08-21 | 1981-03-04 | Schwabe GmbH & Co. KG Elektrotechnische Fabrik | Verfahren zum Herstellen E-förmiger Kernbleche und I-förmiger Rückschlussbleche einer Drossel oder eines Transformators, insbesondere für Gasentladungslampen |
| DE3402036C1 (de) * | 1984-01-21 | 1985-07-11 | Schwabe GmbH & Co KG Elektrotechnische Fabrik, 7067 Urbach | Verfahren zum Herstellen E-förmiger Kernbleche und I-förmiger Rückschlußbleche einer Drossel oder eines Transformators, insbesondere für Gasentladungslampen |
| EP0353029A2 (de) * | 1988-07-27 | 1990-01-31 | Linton And Hirst Limited | Blechlamellen |
-
1993
- 1993-05-05 EP EP93401167A patent/EP0571242A1/de not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2367340A1 (fr) * | 1976-10-11 | 1978-05-05 | Helvar Oy | Noyau de fer pour une auto-inductrice ou un transformateur et son procede de fabrication |
| EP0024319A1 (de) * | 1979-08-21 | 1981-03-04 | Schwabe GmbH & Co. KG Elektrotechnische Fabrik | Verfahren zum Herstellen E-förmiger Kernbleche und I-förmiger Rückschlussbleche einer Drossel oder eines Transformators, insbesondere für Gasentladungslampen |
| DE3402036C1 (de) * | 1984-01-21 | 1985-07-11 | Schwabe GmbH & Co KG Elektrotechnische Fabrik, 7067 Urbach | Verfahren zum Herstellen E-förmiger Kernbleche und I-förmiger Rückschlußbleche einer Drossel oder eines Transformators, insbesondere für Gasentladungslampen |
| EP0353029A2 (de) * | 1988-07-27 | 1990-01-31 | Linton And Hirst Limited | Blechlamellen |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2110357A1 (es) * | 1995-05-05 | 1998-02-01 | Luminotecnicas Especial | Procedimiento de fabricacion de nucleos magneticos para reactancias y transformadores. |
| ES2196973A1 (es) * | 2001-09-14 | 2003-12-16 | Nucleos Magneticos S A | Circuito magnetico para transformadores. |
| EP1575065A3 (de) * | 2004-03-12 | 2008-07-09 | Vossloh-Schwabe Deutschland GmbH | Kernblech für induktives Bauelement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT DE ES FR GR IT NL |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19940525 |