Transformer core

A technology for transformer cores and transformers, applied in the manufacture of inductors/transformers/magnets, components of transformers/inductors, magnetic cores/yokes, etc., to reduce electrical losses, avoid magnetostriction, and reduce core noise Effect

Inactive Publication Date: 2016-01-20
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This air gap increases the reluctance of the transformer laminations and thus the reluctance of the resulting transformer core

Method used

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Embodiment Construction

[0027] exist figure 1 A lamination stack 10 is seen in , which is formed by a plurality of transformer laminations, wherein, in figure 1 Four are shown as examples in , and are denoted by reference numerals 20 , 30 , 40 and 50 . The transformer laminations are made, for example, of a ferrosilicon alloy with soft magnetic properties, that is to say, for example, of so-called silicon steel sheet material.

[0028] The thickness of the transformer laminations is, for example, in the range of 200 to 600 microns. In order to achieve electrical insulation between the transformer laminations, the transformer laminations are preferably provided with a thin electrical insulation layer, which can have a thickness in the range of 1 micron to 5 microns, for example. For clarity, in figure 1 The electrically insulating layer is not shown in detail.

[0029] exist figure 2 A lamination stack 10 can be seen in , in which the transformer laminations 20 , 30 , 40 and 50 are each bent ...

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Abstract

The invention relates to a method for producing a transformer core (200). According to the invention, mutually adjoining lamination edges are connected to one another by means of cold spraying via a magnetizable material. This enables the magnetic flux to remain within the transformer laminations without having to be switched to adjacent transformer laminations. Planar eddy currents can also be avoided in the transformer laminations, and electrical losses and core noise during transformer operation are reduced. By using cold spraying methods, for example, connecting materials can be formed based on nanocrystalline or amorphous materials. Preferably after connecting the two lamination edges of a transformer lamination and before connecting the two lamination edges of the next transformer lamination lying above it, an electrically insulating in each case is provided between the two transformer laminations. Insert (300). This prevents the cold spray jet from hitting the lower transformer lamination when the two edges of the upper transformer lamination are connected.

Description

technical field [0001] The invention relates to a method for producing a transformer core, wherein the transformer core is formed by transformer laminations. Background technique [0002] As for example in Siemens AG's literature "Leistungstransformatoren 10bis 100 MVA–der Garant für und (10 to 100MVA Power Transformers - Guarantee of Highest Quality and Reliability)" records that the transformer core is usually formed by transformer laminations. Due to structural reasons, it is usually not possible to actually butt the edges of the transformer laminations. Instead, the lamination edges are mostly separated from one another by a small air gap, which increases the reluctance of the transformer laminations and thus of the resulting transformer core. [0003] In order to reduce the influence of air gaps, so-called step laminations of transformer laminations are used in a known manner (as also known from the above-mentioned documents). In step laminations, the transformer l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F3/02H01F27/245H01F41/02
CPCC23C24/04H01F3/02H01F27/2455H01F41/0233H01F27/245H01F41/02
Inventor M.厄特尔T.哈默F.海因里克斯多夫J.D.詹森U.克鲁格V.卢森O.斯蒂尔
Owner SIEMENS AG
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