EP0192307A1 - Transformer comprising an air gap - Google Patents
Transformer comprising an air gap Download PDFInfo
- Publication number
- EP0192307A1 EP0192307A1 EP86200234A EP86200234A EP0192307A1 EP 0192307 A1 EP0192307 A1 EP 0192307A1 EP 86200234 A EP86200234 A EP 86200234A EP 86200234 A EP86200234 A EP 86200234A EP 0192307 A1 EP0192307 A1 EP 0192307A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air gap
- gauze
- transformer
- core
- cement
- 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.)
- Granted
Links
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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
Definitions
- the invention relates to a device comprising a ferromagnetic core in which there is provided at least one air gap which is filled with a non-ferromagnetic material comprising a spacer which is embedded in cement.
- a device is known from GB-A 1, 246,458.
- the spacer in the known device is formed by a quantity of hard grains, for example of glass, which are mixed with the cement. The diameter of the grains determines the width of the air gap.
- the object of the invention to propose a device of the kind set forth in which the glass grains are replaced by a spacer which is less expensive and easier to procure.
- the device in accordance with the invention is characterized in that the spacer consists of a plate made of gauze.
- Gauze is usually readily available at an attractive price because it is also manufactured for other purposes.
- a very suitable gauze is the kind which is customarily used for silk-screening.
- FIG. 2 is a detailed longitudinal sectional view of the air gap 7 together with the surrounding parts of the primary coil 3 and the core 1.
- the air gap 7 has a predetermined width d. This width equals the thickness of a gauze plate 9 which is situated in the air gap 7.
- the gauze is embedded in a layer of cement 11.
- the plate 9 which is drenched in the cement 11 is arranged between the two parts of the core which are subsequently pressed together and the cement is allowed to set, for example by heating.
- the diameter of the wires 13 constituting the gauze of the plate 9 then automatically determines the thickness d of the air gap without it being necessary to measure and adjust the spacing of the two part ofs the core during manufacture.
- the thickness d is slightly smaller than twice the diameter of the wires 13 because the wires 13 are slightly compressed at the points of contact.
- a very suitable type of gauze is the type which is customarily used for silk-screening, for example Estal Mono PE 275 which is made by Schweizerische Seidengazefabrik A.G., Thal.
Landscapes
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Developing Agents For Electrophotography (AREA)
- Printing Plates And Materials Therefor (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
- The invention relates to a device comprising a ferromagnetic core in which there is provided at least one air gap which is filled with a non-ferromagnetic material comprising a spacer which is embedded in cement. Such a device is known from GB-A 1, 246,458. The spacer in the known device is formed by a quantity of hard grains, for example of glass, which are mixed with the cement. The diameter of the grains determines the width of the air gap.
- It has been found in practice that the manufacture of glass grains having the necessary dimensional precision is comparatively difficult. Moreover, a manufacturer of ferromagnetic cores for transformers or choke coils uses only comparatively small quantities of glass grains, even when large numbers of cores are manufactured. Consequently, the manufacture of glass grains with the necessary precision is not profitable, so that such glass grains are expensive and often difficult to procedure.
- It is the object of the invention to propose a device of the kind set forth in which the glass grains are replaced by a spacer which is less expensive and easier to procure. To achieve this, the device in accordance with the invention is characterized in that the spacer consists of a plate made of gauze.
- Gauze is usually readily available at an attractive price because it is also manufactured for other purposes. A very suitable gauze is the kind which is customarily used for silk-screening.
- The invention will be described in detail hereinafter with reference to the accompanying drawing. Therein:
- Figure 1 is a diagrammatic side elevation of an embodiment of a transformer in accordance with the invention, and
- Figure 2 is a longitudinal sectional view at an increased scale of the part of the core of the transformer shown in Figure 1 in which the air gap is situated.
- Figure 1 shows a transformer comprising a ferromagnetic core 1, for example of ferrite, which consists of two parts, the transformer further comprising a
primary coil 3 and asecondary coil 5. At the area of theprimary coil 3 the core 1 is interrupted by an air gap 7 (denoted by broken lines). - Figure 2 is a detailed longitudinal sectional view of the
air gap 7 together with the surrounding parts of theprimary coil 3 and the core 1. Theair gap 7 has a predetermined width d. This width equals the thickness of a gauze plate 9 which is situated in theair gap 7. The gauze is embedded in a layer ofcement 11. During the manufacture of the core 1 the plate 9 which is drenched in thecement 11 is arranged between the two parts of the core which are subsequently pressed together and the cement is allowed to set, for example by heating. The diameter of thewires 13 constituting the gauze of the plate 9 then automatically determines the thickness d of the air gap without it being necessary to measure and adjust the spacing of the two part ofs the core during manufacture. The thickness d is slightly smaller than twice the diameter of thewires 13 because thewires 13 are slightly compressed at the points of contact. A very suitable type of gauze is the type which is customarily used for silk-screening, for example Estal Mono PE 275 which is made by Schweizerische Seidengazefabrik A.G., Thal.
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8500463 | 1985-02-19 | ||
NL8500463A NL8500463A (en) | 1985-02-19 | 1985-02-19 | TRANSFORMER WITH AIR SLOT. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0192307A1 true EP0192307A1 (en) | 1986-08-27 |
EP0192307B1 EP0192307B1 (en) | 1989-06-07 |
Family
ID=19845550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19860200234 Expired EP0192307B1 (en) | 1985-02-19 | 1986-02-18 | Transformer comprising an air gap |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0192307B1 (en) |
JP (1) | JPS61189608A (en) |
DE (2) | DE8603702U1 (en) |
NL (1) | NL8500463A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5587694A (en) * | 1993-06-30 | 1996-12-24 | Matsushita Electric Industrial Co., Ltd. | Reactor with core gap spacers |
US5926946A (en) * | 1994-12-28 | 1999-07-27 | Matsushita Electric Industrial Co., Ltd. | Method for manufacturing reactor |
KR101132086B1 (en) * | 2009-06-29 | 2012-04-02 | 울산대학교 산학협력단 | Implant having controlled cell adhesion and proliferation and method for manufacturing the same |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3908224A1 (en) * | 1989-03-14 | 1990-09-20 | Vogt Electronic Ag | COMBINED EMISSION CONTROLLER TO REMOVE SYMMETRICAL AND ASYMMETRICAL INTERFERENCE |
DE4228642A1 (en) * | 1992-08-28 | 1994-03-03 | Tridonic Bauelemente Gmbh Dorn | Choke impedance adjustment method |
DE19833190A1 (en) * | 1998-07-23 | 2000-01-27 | Bayerische Motoren Werke Ag | ignition coil |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2494180A (en) * | 1946-04-06 | 1950-01-10 | Acme Electric Corp | Laminated reactor |
GB2039156A (en) * | 1978-11-29 | 1980-07-30 | Hitachi Ltd | Transformer |
FR2457000A1 (en) * | 1979-05-14 | 1980-12-12 | Victor Company Of Japan | Accurate gap setting for transducer core - inserting non-magnetic round wire to determine gap dimension |
-
1985
- 1985-02-19 NL NL8500463A patent/NL8500463A/en not_active Application Discontinuation
-
1986
- 1986-02-12 DE DE19868603702 patent/DE8603702U1/en not_active Expired
- 1986-02-17 JP JP3101286A patent/JPS61189608A/en active Pending
- 1986-02-18 EP EP19860200234 patent/EP0192307B1/en not_active Expired
- 1986-02-18 DE DE8686200234T patent/DE3663868D1/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2494180A (en) * | 1946-04-06 | 1950-01-10 | Acme Electric Corp | Laminated reactor |
GB2039156A (en) * | 1978-11-29 | 1980-07-30 | Hitachi Ltd | Transformer |
FR2457000A1 (en) * | 1979-05-14 | 1980-12-12 | Victor Company Of Japan | Accurate gap setting for transducer core - inserting non-magnetic round wire to determine gap dimension |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5587694A (en) * | 1993-06-30 | 1996-12-24 | Matsushita Electric Industrial Co., Ltd. | Reactor with core gap spacers |
US5926946A (en) * | 1994-12-28 | 1999-07-27 | Matsushita Electric Industrial Co., Ltd. | Method for manufacturing reactor |
KR101132086B1 (en) * | 2009-06-29 | 2012-04-02 | 울산대학교 산학협력단 | Implant having controlled cell adhesion and proliferation and method for manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
JPS61189608A (en) | 1986-08-23 |
EP0192307B1 (en) | 1989-06-07 |
DE8603702U1 (en) | 1986-04-10 |
DE3663868D1 (en) | 1989-07-13 |
NL8500463A (en) | 1986-09-16 |
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