EP4189709A1 - Transformator - Google Patents
TransformatorInfo
- Publication number
- EP4189709A1 EP4189709A1 EP21769391.0A EP21769391A EP4189709A1 EP 4189709 A1 EP4189709 A1 EP 4189709A1 EP 21769391 A EP21769391 A EP 21769391A EP 4189709 A1 EP4189709 A1 EP 4189709A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transformer
- filling layer
- core
- magnetic
- coil
- 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
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
-
- 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
- H01F27/02—Casings
- H01F27/022—Encapsulation
-
- 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
-
- 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
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- 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
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F2003/106—Magnetic circuits using combinations of different magnetic materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
Definitions
- the invention relates to a transformer.
- a transformer generally has a magnetic core around which at least one coil on the primary side and at least one coil on the secondary side run.
- the magnetic core is usually made of electrical steel to counteract eddy currents in the magnetic core.
- layers of electrical sheet metal are laminated and joined together to form the magnetic core, electrically isolated from one another.
- the magnetic core has a surface with edges and/or steps formed by the electrical steel layers. This creates air-filled gaps between the coils and the surface of the magnet core, which remain unused for conducting a magnetic flux.
- the invention is based on the object of specifying a transformer which is improved with regard to the conduction of a magnetic flux.
- a transformer according to the invention comprises a magnetic core, a coil running around a core section of the magnetic core and a filling layer which is arranged between the core section and the coil and is made of a magnetizable material.
- the magnetizable filling layer fills an otherwise air-filled space between the magnetic core and the coil of the transformer with magnetizable material filled .
- the filling layer supports the conduction of a magnetic flux of the magnetic core of the transformer by increasing the cross-sectional area enclosed by the coil, which is filled with magnetizable material.
- less electrical steel is required to achieve the same magnetic flux, especially with the same coil diameter.
- material and costs for manufacturing the magnetic core can be saved without increasing the electromagnetic induction in the magnetic core.
- support structures in the transformer, such as pressboard or paper cylinders can be reduced since their function can be partially taken over by the filling layer. This also allows costs for the manufacture of the transformer to be reduced.
- the filling layer completely fills an intermediate space between the core section and the coil.
- the aforementioned embodiment of the invention advantageously uses the entire space between the magnet core and the coil to conduct the magnetic flux. This optimizes the effect of the filling layer.
- the filling layer is made from a paramagnetic material.
- the magnetization of the filling layer follows the magnetic field generated by the coil and thus advantageously increases the magnetic flux conducted by the magnet core.
- the filling layer has a higher permeability number than air.
- the aforementioned embodiment of the invention takes into account that the filling layer conducts the magnetic flux compared to a transformer with an air-filled space between the magnetic core and the coil only improved if the filling layer has a higher permeability number than air.
- the higher this permeability number the more the filling layer contributes to the conduction of the magnetic flux and relieves the magnetic core, or the more electrical steel can be saved for the production of the magnetic core.
- the filling layer is made from a soft-magnetic material.
- the filling layer is particularly preferably made of a soft-magnetic composite material.
- Soft magnetic composite material is also referred to as Soft Magnetic Composite (SMC).
- SMC Soft Magnetic Composite
- a soft-magnetic composite material is preferably used which has high mechanical strength and high magnetic permeability.
- the filling layer is produced by pressing and sintering a soft magnetic powder composite material.
- Soft magnetic materials can easily be magnetized in a magnetic field and are therefore particularly suitable as material for the filling layer.
- Soft magnetic composite materials have the particular advantage that they have significantly higher permeability numbers than air and can be pressed and sintered as a powder.
- the filling layer can therefore easily be produced as a molded part by pressing and sintering a soft-magnetic powder composite material, with filling layers with complex three-dimensional geometries also being able to be produced.
- the filling layer has an outer surface facing away from the core section, which has the shape of a cylinder with a smooth, preferably oval and in particular circular guide curve. This advantageously gives the filling layer a smooth outer surface, around which the coil can be arranged without gaps, in contrast to the surface of a magnetic core made from electrical sheet metal.
- the magnet core is made of electrical steel.
- the magnetic core of a transformer is usually made of electrical steel to counteract eddy currents in the magnetic core, and consequently has edges and/or steps.
- the invention makes it possible to fill the spaces between the magnetic core and the coil that occur in such a magnetic core with the filling layer.
- FIG. 1 shows a cross-sectional representation of a magnetic core of an exemplary embodiment of a transformer
- FIG. 2 shows a perspective sectional view of an exemplary embodiment of a transformer.
- FIG. 1 shows a cross-sectional illustration of a magnet core 1 of an exemplary embodiment of a transformer 3 according to the invention (see FIG. 2).
- the magnetic core 1 is made from electrical steel by laminating electrical steel layers (not shown in detail) and joining them together in an electrically isolated manner.
- the Electrical steel layers are designed and arranged with different widths in such a way that the cross section of the magnet core 1 approximates a circular area.
- the surface of the magnetic core 1 has edges 5 and steps 7 due to the layering of the electrical steel sheet.
- FIG. 2 shows a perspective sectional illustration of an exemplary embodiment of a transformer 3 according to the invention.
- the transformer 3 comprises a magnetic core 1 , a coil 9 running around a core portion of the magnetic core 1 , and a magnetizable filling layer 11 arranged between the core portion and the coil 9 .
- the magnetic core 1 is designed like the magnetic core 1 described with reference to FIG.
- the filling layer 11 completely fills a space between the core portion and the coil 9 .
- the filling layer 11 is made of a paramagnetic material, for example a soft magnetic material, which has a higher permeability number than air.
- the filling layer 11 is particularly preferably made of a soft-magnetic composite material (SMC), in particular by pressing and sintering a soft-magnetic powder composite material.
- SMC soft-magnetic composite material
- the filling layer 11 has an outer surface 13 which faces away from the core section and is in the shape of a cylinder with an oval, in particular circular guide curve 15 .
- the filling layer 11 supports the conduction of a magnetic flux of the magnetic core 1 of the transformer 3 by completely filling the cross-sectional area enclosed by the coil 9 with magnetizable material. Compared to a conventional transformer without the filling layer 11 , less electrical steel is required for the same coil diameter in order to achieve the same magnetic flux.
- An example calculation for a magnetic core 1 with a diameter of 29 cm and a cross-sectional area of 587.5 cm 2 and the permeability number 2000 and a cross-sectional area of 660.5 cm 2 enclosed by the coil 9 shows that the cross-sectional area of the magnetic core 1 can be reduced by about 1.3% in order to achieve the same magnetic flux with a filling layer 11 as without the To realize filling layer 11 when the filling layer has the permeability number 200.
- a simulation based on a finite element method shows that in this example, as a result of the increased effective cross section for conducting the magnetic flux due to the filling layer 11, the magnetic flux density in the magnetic core 1 increases from 193.7 mT to 189 mT, ie reduced by 2% compared to an embodiment without the filling layer 11 and the magnetic core 1 is correspondingly relieved.
- a filling layer 11 with an even higher permeability number enables a further reduction in the cross-sectional area of the magnet core 1 and thus a corresponding reduction in the amount of electrical lamination required to produce the magnet core 1 or an even greater relief of the magnet core 1 .
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Coils Or Transformers For Communication (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020211253.3A DE102020211253A1 (de) | 2020-09-08 | 2020-09-08 | Transformator |
| PCT/EP2021/073487 WO2022053316A1 (de) | 2020-09-08 | 2021-08-25 | Transformator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4189709A1 true EP4189709A1 (de) | 2023-06-07 |
| EP4189709B1 EP4189709B1 (de) | 2025-10-01 |
Family
ID=77726460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21769391.0A Active EP4189709B1 (de) | 2020-09-08 | 2021-08-25 | Transformator |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20230360836A1 (de) |
| EP (1) | EP4189709B1 (de) |
| CN (1) | CN116348974A (de) |
| DE (1) | DE102020211253A1 (de) |
| WO (1) | WO2022053316A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2897384B2 (ja) | 1990-09-25 | 1999-05-31 | 松下電器産業株式会社 | 電磁機器および電磁機器の製造方法 |
| DE102007054917A1 (de) * | 2007-11-15 | 2009-05-20 | UNI-Geräte E. Mangelmann Elektrotechnische Fabrik GmbH | Verfahren zur Verbesserung des Wirkungsgrades von elektromotorischen Vorrichtungen sowie unter Anwendung dieses Verfahrens hergestellte elektromagnetische Vorrichtungen |
| EP2529380B1 (de) * | 2010-01-27 | 2013-11-06 | Alstom Technology Ltd. | Magnetischer kern |
| EP3001435B1 (de) * | 2014-09-29 | 2017-11-15 | Siemens Aktiengesellschaft | Trockentransformatorkern |
| DE102018203087A1 (de) | 2018-03-01 | 2019-09-05 | Siemens Aktiengesellschaft | Kern für einen Transformator |
-
2020
- 2020-09-08 DE DE102020211253.3A patent/DE102020211253A1/de not_active Withdrawn
-
2021
- 2021-08-25 WO PCT/EP2021/073487 patent/WO2022053316A1/de not_active Ceased
- 2021-08-25 EP EP21769391.0A patent/EP4189709B1/de active Active
- 2021-08-25 US US18/044,412 patent/US20230360836A1/en active Pending
- 2021-08-25 CN CN202180071495.5A patent/CN116348974A/zh not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| CN116348974A (zh) | 2023-06-27 |
| EP4189709B1 (de) | 2025-10-01 |
| US20230360836A1 (en) | 2023-11-09 |
| DE102020211253A1 (de) | 2022-03-10 |
| WO2022053316A1 (de) | 2022-03-17 |
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