JPS586108A - Iron core for static electromagnetic apparatus - Google Patents

Abstract

PURPOSE:To contrive an iron loss in iron core by a method wherein iron core elementary plates are alternately stacked so that one junction shape of centrol leg section iron core elementary plates or inside yoke section iron core elementary plates of T junction sections may differ from the other junction shape. CONSTITUTION:An iron core 1 is composed by stacking leg section iron core elementary plates 21, 33, 41 and yoke section iron core elementary plates 53, 54, 55. One end of the elementary plate 33 is formed in mountain shape so that the one end may join at an angle of 45 deg. to a notch section 551 formed at a part of 1/2 in width of the elementary plate 55. The other end of the elementary plate 33 is cut at an angle of 45 deg. and joined at an angle of 90 deg. to the elementary plate 54. The iron core elementary plate of each layer is alternately stacked by inverting the upper part and lower part and the surface and rear and magnetic resistance to each magnetic flux of three phase at the junction section is equalized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an iron core of a stationary electromagnetic device, and particularly to improvements in the joint shape thereof.

In general, for example, the iron core of a three-phase three-leg transformer with inner iron type has the same cross-sectional +ffi shape as shown in Fig. 1, and the iron core is made of unidirectional silicon steel plates with the same cross-sectional area and the same magnetic properties. The legs are made by laminating many pieces of raw board.
) (4) and a yoke (6) formed by laminating a large number of core blanks made of silicon steel plates.

However, at the part where the central leg part (3) and the yoke part (6) intersect (hereinafter referred to as the joint part), the magnetic flux indicated by the solid arrow has φ
8. Rotating magnetic flux is generated by the temporal change of φ◇
Therefore! If the blank plates of each core are not joined so that the magnetic resistance of the magnetic path of the magnetic flux φhφhφ at the joint is equal, the waveform of the magnetic flux will be disturbed and the loss will increase. As shown in , each n-th layer iron core blank (2) @ (an In Iil as shown by the solid line) is the (n+1) layer or (!L-1) layer iron core blank t-adjacent as shown by the dotted line. The contact portions of the respective blank plates in the joint portion where they are stacked and laminated and subjected to II!llI are configured so as not to overlap.

Here, the joint between the side leg core blank @(b) and the yoke core blank 6υ ring is configured to be at 46°, and the abutting portions of adjacent blank plates overlap.

That is, in Figure 2! At the joining part, the center leg bare iron core plate ■ and the yoke iron core bare plate en bag are all joined at a 45° angle, taking into account the different directionality of the magnetic properties of grain-oriented silicon steel plates. Because of this structure, there was a disadvantage that scrap was generated in the iron core material and a large amount of official material was required.

Moreover, in order to obtain the mechanical strength of the iron core] 1), nine overlaps are made between the iron core blanks, surrounded by solid lines and dotted lines.

Therefore, since a notch is formed in the core blank at the inner corner of the T-junction, the core cross-sectional area decreases in this portion, and the magnetic resistance locally increases. This has the disadvantage that the magnetic flux waveform is distorted and iron loss increases.

Furthermore, Figure 8! At the joint, the central leg core blank (2
) and the core plate of the yoke are configured to be joined at a 90° angle, so no scrap is generated in the core material, but the magnetic resistance of the T-joint is higher than that in Figure 2. This has the disadvantage that it becomes considerably larger and the iron loss further increases.

This invention aims to eliminate the drawbacks of the conventional ones, and is an economical static electromagnetic device that satisfies the contradictory requirements of reducing the cost of the laminated core and maintaining good quality of the laminated core at the same time. Provide equipment. That is,!
The core blank plates are stacked alternately so that the joint shape of one of the central leg core blank plates and the inner yoke core blank plates of the joint is different from the other joint shape, thereby reducing the waveform distortion of the magnetic flux. An embodiment of the present invention will be described below based on FIG. 4. In other words, in Figure @4, 11) is the leg core blank (2)
This is an iron core constructed by laminating @- and yoke part iron core blank tIItI4f4. Here, one end of the central leg core blank plate has a notch 1 formed in the width of the yoke core blank plate.
[551)], the core is formed in a mountain shape so that it is joined at an angle of 45'', so there is no dent in the notch on the core.Also, the other end of the central leg core blank plate is at a 46° angle. Although it is sheared at an angle of , it is joined to the yoke part iron core blank plate - at an angle of 90°.The blank plate f!@@t4- is formed in the same manner as that shown in FIG.

Next, the core blanks of the (1+1)th layer (also Fi(n-1)th layer) are alternately stacked with their top and bottom and front and back reversed with respect to the plane of the paper. The reluctance to each magnetic flux at the junction is therefore reduced and equalized.

Table 1 shows a comparison of iron loss when a highly oriented iron core material is used with the conventional iron core structure shown in FIG. 2.

Table 1 These 11 examples have magnetic flux densities in a wide range of 1.5 to 1.9 Tesla, which is lower than that of conventional iron core structures, especially when the magnetic flux density is 1.7 Tesla or more. ti5
The revision effect of more than % was introduced.

Furthermore, the part where the central leg core blank plate is joined to the yoke iron cord plate is sheared diagonally with respect to the rolling direction of the silicon steel plate, and the apex 1a end) is 1 of the core blank width. Since they are formed so as to be located on a line in the rolling direction, scrap is generated in the core material, but the center leg core blank and the yoke core pieces are at an angle of 46° and the core blankと-とは9
Since the core blanks are sheared so as to be joined at a 000 angle, no scrap is generated. Therefore, in the core structure according to this embodiment, the amount of scrap generated can be reduced to approximately 60% of that of the conventional structure shown in Fig. 2. It is something.

FIG. 6 shows another embodiment of the present invention, in which the shape of the central leg core blank plate and the part where it joins with the yoke core blank plate are the same as those in FIG. The part of the yoke that connects to the core blank plate, which is cut at an angle of 46 degrees, is formed at an angle of 9000 degrees.The other shape of the core blank plate is the same as that of No. 4 III. Carved O
The core blanks are stacked alternately while being turned upside down with respect to the paper surface.

The iron loss of the core and the quantity of the core material O starboard are almost the same as those of the example shown in No. 411.0 Figure 6 shows an example of the case of the outer iron type Sanwa laminated iron core. As shown in (a), one end of the inner yoke core blank D〇 is joined at an angle of 46° to the rolling direction without a notch, and the other end is joined at an angle of t-90°. Then, stack the adjacent layers upside down with respect to the plane of the paper as shown in () to obtain the iron core (1) as shown in (/).Here, a81
s3- is the outer wire core blank plate, and t'D) is the leg core blank plate.

With such a configuration, iron loss and the amount of material scrap can be reduced.

As described above, the iron core of the stationary electromagnetic device according to the present invention abuts the notch of the iron core blank of the chevron-shaped end pipe tube 1 of the first iron core blank to form a T-junction, and also forms a T-junction between the two. When forming the core by laminating each of the core blanks, the abutting parts of the core blanks at the T-junction are prevented from overlapping, which reduces and equalizes the magnetic resistance at the T-junction. , iron loss can be reduced. Furthermore, since the amount of scrap of iron core material can be reduced, official materials can be saved, and the quality is good and economical.

[Brief explanation of the drawing]

Figure 1 is a schematic plan view of the conventional inner iron type ball-shaped king leg core;
8 are detailed plan views of the main parts of FIG. 1, and FIG. 4 is a plan view showing one embodiment of the present invention. FIGS. 5 and 6 are plan views showing other embodiments of the present invention. It is. In the figure, 111 is the iron core, (, 11 to (4) are the legs, (1)
is the yoke part, (2)e cal-(b)(c)(to) is the leg core blank plate, and en-11~- are the yoke part iron core blank plate. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 σ l Figure 4 Figure 5 IJt

Claims (1)

[Claims] One end of l1l is mountain-shaped [! a 10th core blank, which has a notch that the chevron-shaped end of this first core blank comes into contact with, and a second core that has a T-joint metal engraving together with this first core blank; When laminating these first and second iron core blanks, the above! An iron core for a stationary electromagnetic device, characterized in that the abutting parts of the joining part 04 blank plates are configured so that they do not meet at all. (s)ill The mountain-shaped end of the iron core blank comes into contact with a notch formed in the width direction of the second iron core blank up to the sound production center. The iron core of the stationary electromagnetic equipment described in item 1. (3) An iron core for a stationary electromagnetic device according to claim at, wherein the other end of the first iron core blank is formed in a shape different from the shape of one end thereof.