JPH0114686B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a no-loss manufacturing method (punching method) for E/I type laminated iron cores for block combination type transformer cores. Conventionally, generally used core transformers are manufactured using E-shaped pieces X and I, which are punched out of electromagnetic steel sheets.
As shown in Figure 1a, a method is adopted in which the mold pieces Y are alternately inserted into the coil L one by one to form a laminated core, and this work is done by hand or by machine using a stacker. ing. However, in both cases, the work involved packing the steel plates one by one, which took too much time and caused problems such as poor slippage, which required time for shaping after packing. To solve this problem, instead of packing each sheet into a coil as described above, we prepared the required number of steel sheets of the same type, as shown in Figure 1b, and welded, glued, and There is a method of making a block with a fastener, etc., inserting it into the coil L, and then fixing it with a fastener, welding, etc., but as shown in Table 1b, the magnetic properties are several steps inferior to the EI alternate insertion method. In addition, compared to the one shown in Figure 1a, the joint of the E type piece X and the I type piece Y is in a straight line, and as shown in Figure 1a, the E type piece
Since the joints of the mold pieces Y do not overlap each other, leakage magnetic flux increases and noise is generated. Table 1 shows the primary side of each transformer.
The magnetic properties are qualitatively shown by the no-load current value when 100V is applied.

[Table] (corresponding)
We believe that such bad results come from the unevenness caused by so-called burrs on the cut surface during the forming process of the steel plate.
As shown in Figure 1c, the joint surface P of the E and I blocks
When polished, a structure similar to that of the conventional structure a was obtained, as shown in Table 1 c. However, in both of the blocking methods shown in Figures 1b and 1c, after inserting the block into the coil L, both blocks must be fastened using fasteners, welding, etc., so it is difficult to automate the assembly process using a robot or the like. In addition, when the method shown in c is adopted, the number of polishing steps increases, which has the disadvantage that productivity deteriorates. As a result of further experimental research, the inventor of the present invention found that, in the combination method of laminated iron core blocks, each laminated steel plate has different dimensions, as shown in Figure 1d.
A method in which a laminated core block or laminate is prepared by preparing X', This new block assembly method allows for assembly by automated equipment or robots, and
Even without polishing the abutting surfaces, as shown in Table 1 d, magnetic properties that are no different from those of the conventional method and less noise can be obtained. The present invention aims to provide a method for manufacturing the E/I type laminated core used in this new block combination method without producing cut layers (without loss). That is, in the present invention, an I-shaped piece Y having a length a and a width c and an I-shaped piece Y' having a length a and a part or all of the width engaged with each other and widened by a width α are cut into a = shape, and Such as I
The length of the vertical side is a so that it fits with mold pieces Y and Y',
Two E-shaped pieces X' and X'' with protruding leg lengths of a-α/2 and a+α/2 are cut facing each other to create an E/I-shaped laminated piece. An example will be explained based on the drawings as follows. Fig. 2 shows a strip-shaped electrical steel sheet H to E.
This shows an example of the cutting pattern when making an I-type laminated core, where X' and X'' are E-type pieces, and Y and Y' are I-type pieces.
It is a mold piece. In this embodiment, the vertical sides of the E-shaped pieces X′, X″,
I type piece Y, Y' length is a, width is c
The mold piece Y and the I-shaped piece Y′, which is made wider by the width α by interlocking the width at three places, are cut into = shapes, such as the I-shaped piece Y,
Face the E-shaped pieces X′ and X″ so as to combine with Y′,
Let the length b of the protruding leg of one E-shaped piece X' be a-α/2, and the length of the protruding leg of the other E-shaped piece The ``leg'' was cut to make it longer. In this example, a strip-shaped electromagnetic steel sheet H having a width of a was cut into E-shaped pieces X' and X'' alternately.
A strip-shaped electromagnetic steel sheet with a width of (2b + 2c) is made into an E-shaped piece
It is also possible to cut the E-shaped pieces X' and X'' continuously with the X'' facing each other. By alternately stacking the I-shaped pieces Y and Y', an E-shaped piece block 1 and an I-shaped piece block 2 of the interlocking system having concave and convex interlocking parts on opposing surfaces are constructed. . As described above, according to this manufacturing method, it is possible to manufacture E-shaped pieces and I-shaped pieces of the interlocking assembly method without generating any cutting waste (no loss).
The industrial value of manufacturing E/I type laminated cores of the intermeshing type is extremely large. In this embodiment, when the I-shaped pieces Y and Y' are laminated to form a concave-convex meshing part, adhesive tapes 3, 3 are wrapped around the narrow part of the I-shaped piece Y' to create a block and form a concave-convex mesh. Although the entire width of the I-shaped piece Y' can be made to be (c+α). Further, although the engagement width α is set at the center leg side of the E-shaped piece, it is of course possible to set it at the outer leg side. In any case, by stacking E-shaped pieces X' and An iron core similar to a conventional iron core can be obtained.

[Brief explanation of drawings]

FIG. 1 is a front view of a transformer using E/I type pieces according to the conventional product and the present invention, FIG. 2 is a plan view of an embodiment of the cutting pattern according to the present invention, and FIG. FIG. 4 is a plan view of the transformer core constructed from the produced laminated pieces, and a front view thereof. X, X', X''...E type piece, Y, Y'...I type piece,
1...E type one block, 2...I type one block.

Claims (1)

[Claims] 1. An I-shaped piece Y with a length a and a width c and an I-shaped piece Y' with a length a and a part or all of the width engaged and widened by a width α are cut into a = shape. , and two E-shaped pieces X' with a vertical side length a and protruding leg lengths a-α/2 and a+α/2 to be combined with the I-shaped pieces Y, Y', A no-loss manufacturing method for E/I type laminated iron cores, which is characterized by cutting X'' facing each other to make E/I type laminated pieces.