JPS6329815B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a core leg component block used to construct the leg of a reactor core.

As shown in Fig. 1, a reactor core is used in which voids 2 are formed in core legs 1u, 1v, and 1w, and each core leg is made of, for example, laminated magnetic steel plates arranged radially. It is constructed by stacking iron core blocks 3 having circular cross sections with a large number of columnar gear spacers 4 interposed therebetween. The core legs 1u to 1w are the upper and lower yoke parts 5, 6.
The yoke parts 5, 6 are pulled together by a tightening bolt 7 provided across yoke clamping fittings 5', 6' that tighten the sides of the yoke parts. It is tightened like this. As a result, the core block 3 and the gear spacer 4 are tightened in the axial direction, and the respective parts are integrated to form a reactor core 8. In such a reactor core, gaps 2 are formed between the core blocks by a large number of gear spacers 4, so if there is variation in the height of each gear spacer, there will be a looseness between the stacked core blocks and the gear spacers. This causes the iron core block to easily vibrate due to vibrations due to magnetostriction of the iron core and magnetic attraction force acting on the gap, causing noise generation. Therefore, in this type of core, it is desirable to make the height of each gear spacer the same to make the connection between the gear spacer and the core block as tight as possible.
Dimensional accuracy was achieved by polishing the end faces of the iron core block and a large number of gear spacers individually, which had the drawback of requiring a long time to process and making manufacturing time-consuming. Also, the gear spacer 4 is connected to the iron core block 3.
Since the gear spacers are fixed with adhesive to the upper end surface (laminated surface) of the core block before being stacked, even if each gear spacer is polished with sufficient finishing accuracy, there will be no space between the gear spacer and the end surface of the core block. Due to variations in the amount of adhesive, etc., the upper end surfaces of the many gear spacers fixed to the core block are often not flush, and this makes it impossible to reduce the vibration noise of the core to a certain level. There was a drawback.

An object of the present invention is to provide a reactor for use in which the end face of a gear spacer fixed to the laminated surface of an iron core block can be finished flush with ease and with high precision, thereby further reducing the noise generated from the iron core. The purpose of this invention is to propose a method of manufacturing a core leg component block.

The manufacturing method of the present invention will be explained in detail below using examples shown in the drawings.

FIG. 2 shows a reactor core assembled using a core leg component block manufactured by the method of the present invention, and FIG. 3 shows a plan view of the core leg component block manufactured by the method of the present invention. ing.
In addition, in this specification, "core leg component block"
The term ``'' means that a gear spacer is fixed to the end face of the iron core block in the axial direction.

As shown in FIG. 3, the core block 3 consists of a large number of unit blocks 302 formed by laminating electromagnetic steel sheets 301 so as to have a fan-shaped cross section, arranged radially around an insulating cylinder 303. It is formed into a circular cross section. The insulating cylinder 303 is made of Bakelite, for example, and has a length such that its upper end protrudes slightly above the upper end surface of the iron core block. To manufacture this iron core block 3, as shown in FIG. 4, a mold 11 consisting of a cylindrical body with a bottom and whose height is slightly higher than the height of the electromagnetic steel plate and whose bottom surface 11a is flat is prepared. After placing the insulating cylinder 303 in the center of this mold, the electromagnetic steel plates 301 are vertically erected and arranged radially between the insulating cylinder 303 and the peripheral wall of the mold. As a result, the core block 3 is formed in the mold, and the upper end of the insulating cylinder 303 is in a state that slightly protrudes from the upper end surface of the laminated steel plate of the core block in the mold. Subsequently, a predetermined number of cylindrical gear spacers 4 made of an insulating material such as porcelain are placed on the upper end surface of the iron core block 3 with their lower end surfaces in contact with the upper end surface of the iron core block 3 at a predetermined interval. Before each gear spacer 4 is placed on the iron core block 3, only its lower end surface is polished. After the gear spacers 4 are arranged on the upper end surface of the iron core block, the gear spacers 4, 4, . . . are simultaneously pressed against the upper end surface of the iron core block using a presser plate (not shown) to position each gear spacer. Next, the upper end surface of the iron core block 3 and the mold 11
A liquid thermosetting synthetic resin 12 such as epoxy is injected into the recess formed near the upper end of the peripheral wall. In this embodiment, the resin is also allowed to flow into the gaps between the electromagnetic steel plates constituting the core block.
After that, the whole is carried into a heating furnace and heated to heat and harden the synthetic resin liquid. By hardening the resin, the laminated electromagnetic steel sheets 301 are integrated, and at the same time, the gear spacers 4, 4, . . . are fixed to the upper end surface of the iron core block 3. Thereafter, the whole is taken out of the heating furnace, and the upper end surfaces of the gear spacers 4, 4, . In this way, by finishing the upper end surfaces of the gear spacers 4 after fixing them to the core block 3, the heights of the upper end surfaces of each gear spacer 4 can be made uniform at once with high precision. After finishing the polishing process, the mold 11 is removed to obtain the core leg component block 10. The lower end surface of each iron core block 3 that the upper end surface of each gear spacer 4 comes into contact with is the bottom surface 1 of the mold 11.
Since the surface is regulated by 1a and is substantially flat, there is no need to polish the lower end surface of each iron core block 3. Furthermore, even if the metal mold 11 as described above is not used when stacking the core blocks 3, the lower end surfaces of the core blocks 3 can be stacked by stacking steel plates on top of a flat surface plate. Can be easily flattened.

Iron core leg component block 1 manufactured as above
As shown in FIG. 2, a plurality of gear spacers (four in the illustrated example) are stacked on the lower yoke part 6 with the gear spacer 4 facing upward, and the gear spacer 0 is the gear spacer of the uppermost core leg component block 10. Further, the iron core block 3 is placed on top of the iron core leg parts 1u to 1.
w are respectively constructed. Next, the iron core legs 1u to 1w
After the windings 15u to 15w are fitted into the
An upper yoke part 5 is disposed on the topmost core block 3, and the core leg part 1u straddles yoke clamping fittings 5' and 6' that tighten the upper and lower yoke parts in the stacking direction, respectively.
A tightening bolt 7 is provided extending vertically on the outside of each of the holes 1w to 1w. and each tightening bolt 7
Both ends of the bolts pass through the horizontal plate portions 5a' and 6a' of the upper and lower yoke fastening fittings 5' and 6' and protrude upward and downward from both horizontal plate portions.
A nut 71 is screwed into each end protruding from a'. By tightening this nut, each core leg is tightened in the axial direction, and the predetermined gap 2 is tightened.
Windings 15u to 15 are installed on the core legs 1u to 1w having
The reactor fitted with w is completed.

As described above, according to the method of the present invention, the upper end surface of each gear spacer 4 can be finished flush with high precision, so as shown in FIG. When configuring a steel core, it is possible to prevent a gap from forming between the upper end surface of each gear spacer and the lower end surface of the core block above it, and prevent magnetostriction of the core and magnetic attraction between the core blocks. It is possible to suppress the vibration and noise of the iron core caused by force.

In the above embodiment, the upper end surface of the gear spacer is brought into direct contact with the lower end surface of the iron core block.
A cushioning material such as a thin pressboard plate may be interposed between the upper end surface of each gear spacer and the lower end surface of the iron core block thereon.

In the above embodiment, the gear spacer has a cylindrical shape, but the gear spacer may have any shape as long as both end surfaces are flat.

In the above embodiment, the lower end of each gear spacer is embedded and fixed in the resin 12, but each gear spacer is fixed by interposing an adhesive between the lower end surface of each gear spacer and the upper end surface of the iron core block. You may also do so.

As described above, according to the present invention, after a plurality of gear spacers are fixed to an iron core block, the end faces of the plurality of gear spacers are simultaneously polished and finished flush, so that the end faces of each gear spacer can be polished to the same level in a short time with high precision. It can be placed on a plane. Therefore, when the reactor core is assembled, it is possible to prevent gaps from forming between each core block and the gear spacer, thereby reducing the vibration noise of the core, thereby providing a low-noise reactor.

[Brief explanation of the drawing]

FIG. 1 is a front view schematically showing a conventional reactor core, FIG. 2 is a front view showing a reactor core assembled using core leg constituent blocks made by the method of the present invention, and FIG. Fig. 3 is a partially cutaway plan view of a core leg component block made by the method of the present invention, and Fig. 4 is a cross-sectional view showing a state in which resin is injected into the mold by the method of the present invention. . 1u~1w... Core leg, 2... Gap, 3...
Iron core block, 4... Gear spacer, 5...
Upper yoke part, 6...Lower yoke part, 8...Reactor core, 12...Resin.

Claims (1)

[Claims] By stacking a plurality of core leg component blocks each having a plurality of gear spacers fixed to the laminated surface of a core block made of a laminate of steel, the core leg component blocks of a reactor core constituting the core leg are manufactured. In the method, after the plurality of gear spacers are fixed to the end face of the iron core block, the surfaces of the plurality of gear spacers located on the opposite side to the end face of the iron core block are polished so as to be located on the same plane. A method for manufacturing a core leg component block for a reactor, characterized by: