Three-phase wound core and three phase transformer

A technology for winding iron cores and iron cores, applied in the direction of transformer/inductor magnetic cores, etc., can solve the problems of increasing the number of manufacturing processes and increasing the size of manufacturing equipment, and achieve the effect of reducing the amount of use

Inactive Publication Date: 2006-12-27
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Reducing the size of a wound core is an effective method for downsizing a large static induction device, but it leads to an increase in the number of manufacturing processes and an increase in the size of the manufacturing facility

Method used

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  • Three-phase wound core and three phase transformer
  • Three-phase wound core and three phase transformer
  • Three-phase wound core and three phase transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] figure 1 Shows the first embodiment of the present invention. Such as figure 1 As shown, the three-phase wound core is composed of a first inner core 1 , a second inner core 2 and an outer core 3 . Because the core magnetic flux density distribution of the transformer is concentrated in the inner core, therefore, in order to suppress the loss of the core, it is ideal to set an inner core joint 4 and an inner core joint 5 on the inner core 1 and inner core 2 respectively, instead of It splits. In addition, in the case of the inner core, since the cutting length of the silicon steel sheets is relatively short, there are no special restrictions on the manufacturing process, and one-point bonding is sufficient.

[0037] On the other hand, if the outer core is provided with one junction, the cutting length will become longer, and if it is arranged in a rectangular shape, the external dimensions will increase, and it will be easily restricted by equipment. Therefore, th...

Embodiment 2

[0041] figure 2 Shows the second embodiment of the present invention. The negative lesson that the size of the joint of the outer core of the stepped lap joint shown in the first embodiment can suppress the size of the joint is that it tends to hinder the flow of magnetic flux and increase the loss of the core. Therefore, by making at least one of the joints of the outer core overlap, the loss of the core can be suppressed. figure 2 In this case, the increase in size of the transformer can be reduced by arranging the superimposed outer core connecting portion 7 on the upper yoke portion. This is because there is a gap between the upper part and the upper end of the outer core, and since terminals for connection are arranged on the upper part, the increased size of the overlapping joint can be accommodated within this size range.

Embodiment 3

[0043] Again, if image 3 As shown, if both the upper and lower outer core joints 6 and 7 are joints in an overlapping manner, the outer core loss can be further suppressed.

[0044] Here, since the size of the connection portion of the outer core joint portion formed on the lower yoke portion becomes large, the core is unstable. For stability, it is best to pack in a pad of the same thickness as the increased size of the lower lap.

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PUM

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Abstract

In order to solve the problem in making large triphase with wound iron core to need many making steps and large equipment, the present invention has the large triphase iron core split into relatively short and light parts. The triphase wound iron core of the present invention includes one first inner iron core, one second inner iron core and one rectangular outer iron core outside the inner iron cores. The first inner iron core and the second inner iron core are jointed in some jointing point, the outer iron core is further split into several parts, and all the inner iron cores and the outer iron cores parts are jointed to form the triphase wound iron core.

Description

technical field [0001] The present invention relates to static induction equipment such as a three-phase transformer using a three-phase wound core made of silicon steel sheet. Background technique [0002] As cores for three-phase transformers, laminated cores and wound cores are known, and laminated cores are suitable for larger-sized transformers. Such as Figure 7 As shown, the laminated core is composed of coil leg parts 1a to 1c and yoke parts 2a and 2b, and the joint parts of each part are butted at a cut angle of 45°. In the case of the three-phase laminated core, there are six butt joints 3d, and the joint shape has a great influence on the characteristics, and the fewer the joints, the better the properties are. Also, since the flux flow in the transformer is such that there is little flux flow outside the core, it is wasteful to use the core at the corners. In the manufacturing process of the laminated core, there are many kinds of shapes of the upper yoke part ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/25
Inventor 筒井宏海津朋宏
Owner HITACHI IND EQUIP SYST CO LTD
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