JPS5928971B2 - transformer core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transformer core constructed by butting together an E-type core made of laminated E-type steel plates and an I-type core made of laminated I-type steel plates.

Conventionally, when laminating E-type steel plates and I-type steel plates to form a transformer core, as shown in Fig. 1, E-type steel plates 1 that are punched out and separated one by one are stacked and fixed to the side legs 2. An E-shaped core 4 is formed by abutting the supporting metal fittings 3 and fastening with bolts 3', and an electric wire or electrical foil is wound around the central leg 5 of this E-shaped core 4. A coil 6 shown in the figure is inserted, and an I-type core 8, which is constructed by laminating separate and independent I-type steel plates 7 one by one, is placed on the E-type core 4 and fixed with the support metal fittings 3.

At this time, the gap 9 at the abutting portion is made small, and for this purpose, the abutting surfaces are made horizontal. However, this method of manufacturing a transformer core has the following drawbacks. That is, since there is no fixing support fitting 3 on the central leg 5 of the E-type core 4, the central leg 5 has a structure that allows it to move freely. Since the upper part of the laminated I-type core 8 is struck with
As shown in FIG. 3, the outermost layer of the central leg 5 of the E-type core 4 and the steel plate 1 near it are often displaced from the I-type core 8.
As a result, the magnetic properties of the iron core are reduced, and this becomes a major cause of variations in the properties of transformers as products. In addition, when using a steel plate with low hardness, depending on the bolt tightening condition, the outermost steel plate □ of the I-type core 8 may bend as shown in Fig. 4, and the outermost steel plate 1 of the E-type core 4 may bend as well. As a result, the E-shaped core 4 and the I-shaped core 8 were bent, and the misalignment between them was large.

Furthermore, the space factor of the central leg 5 of the E-shaped core 4 when the cores are stacked becomes poor, and the inserted coil 6 also becomes large, which is economically disadvantageous. In addition, the edge of the central leg 5 of the E-type iron core 4 easily damaged the coil 6. The present invention has been made in view of the above-mentioned conventional drawbacks, and the fifth embodiment of the present invention will be described below.
This will be explained with reference to FIGS.
This shows an example in which block-shaped steel plates 10 and 11, in which two or more steel plates are bonded in advance, are attached to both ends of an I-type iron core 8 in which I-type steel plates □ are laminated and an E-type iron core 4 in which E-type steel plates 1 are laminated. They are arranged respectively and fixed with supporting metal fittings 3.

In the above configuration, since a bonded thick steel plate block is less likely to deform than one piece by piece (for example, the inertia rate related to bending deformation is proportional to the cube of the thickness), the I-type Even if force is applied to the core using a hammer or the like in order to reduce the gap 9 between the core 8 and the E-shaped core 4 or to adjust the core, it will not easily deform. In particular, since the end of the center leg 5 is a block, deformation as shown in FIG. 3 does not easily occur, and deformation of the iron core due to the tightness of the bolt 3' as shown in FIG. 4 does not occur, and the I The overlap between the type iron core 8 and the E type iron core 4 is ensured. Note that the punched steel plates can be easily bonded by using a resin such as varnish or by welding.

FIG. 6 shows a second embodiment of the present invention, in which the core is made up of only a plurality of block-shaped steel plates 10, 11, which has greater strength than the case shown in FIG. The gap 9 can be easily reduced. Of course, a structure intermediate between that shown in FIGS. 5 and 6 also has the same effect.

FIG. 7 shows a third embodiment of the present invention, in which a right-angled section of the edge portion of the central leg 5 on the side including the outermost steel plate of the iron core of a block-like steel plate 10 in which two or more steel plates are bonded together. , without damaging the inserted coil 6.
Further, the size of the coil 6 can be reduced only by the rounded inner corner portion of the coil 6.

Note that the edges can be removed by filing them down, or by melting them with a welding machine, which also serves as adhesive for block production.

In addition, in advance, the steel plate on the outermost layer of the iron core and the central leg 5 in the vicinity
A similar effect can be obtained by using one with a small width. The shape of the center leg 5 after the edges are removed is polygonal or arcuate as shown in FIG.

As is clear from the above description, the present invention provides the following effects. (1) Since the outermost layer of the central leg of the E-type core and the steel plate near it are not deformed, the E-type core and I-type core can be reliably overlapped.

As a result, the magnetic properties of the iron core do not deteriorate and the variation in the iron core becomes small. (2) When butting the E-type core and the I-type core, it is possible to stack steel plates and reduce the gap in a short time.

(3) In particular, since the outermost steel plate or two of the central leg of the E-type core is not deformed and the space factor is not deteriorated, the inserted coil can be made small and economical.

(4) If the edge of the center leg on the side that includes the outermost steel plate of the block-shaped steel plate constituting the center leg of the E-type core is rounded, the coil is less likely to be damaged and the coil can be made smaller.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional transformer core, Figure 2 is a perspective view of the inserted coil, Figures 3 and 4 are plan views showing the deviation and deformation of the core that occurs when fixing the core. 5 is a side view of the iron core according to the first embodiment of the invention, FIG. 6 is a side view of the iron core according to the second embodiment of the invention, and FIG. 7 is a side view of the iron core according to the third embodiment of the invention. A plan view of such an E-type core, FIG. 8A
, b are plan views showing an example of edge removal according to the third embodiment. 1...E type steel plate, 4...E type iron core, 5
...Central leg, 7...I type steel plate, 8...
...I-type iron core, 10, 11... Block-shaped steel plate.

Claims (1)

[Scope of Claims] 1. In a transformer core formed by butting together an E-type core made of laminated E-type steel plates and an I-type core made of laminated I-type steel plates, at least the outermost steel plate of the E-type core and the I-type iron core 1. A transformer core comprising a block-shaped steel plate made by bonding two or more steel plates together in advance. 2. The transformer core according to claim 1, wherein a right-angled section of the block-shaped steel plate of the center leg of the E-type core is formed in a polygonal shape or an arc shape.