JPS5928974B2 - Reactor with gap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reactor with a gap, and particularly to improvements in an iron core and its tightening structure.

Generally, in a power reactor, the core leg portion is divided into a plurality of blocks according to desired characteristics, and a gap is provided between each block perpendicular to the direction of magnetic flux. If such a block is to have a laminated core structure, it is necessary to take measures to prevent deformation of the block core and prevention of the silicon steel plate from falling off. Figures 1a and b show the core structure of a reactor with a gap. Figure 1a shows a structure in which silicon steel plates are laminated and tightened with bolts, and Figure 1b shows a structure in which silicon steel plates are laminated and the gaps between the layers are shown. It shows a structure impregnated with resin etc. Figure 1a,
In b, 1 is a block core, 2 is a gap insulator interposed in the gap between the block cores 1, 3 is an upper yoke core, 4 is a lower yoke core, and 5 is a tightening bolt.
Next, I will explain the manufacturing method of block core 1.
In the bolted block core structure shown in Figure a, it is necessary to drill punched holes for bolts. These punched holes not only require a lot of processing time, but also have magnetic properties that cause disturbances in the magnetic flux around the punched hole, and burrs created during punching can cause short circuits between the core layers, reducing interlayer resistance. This increases iron core loss. In addition, the block core with this clamping structure requires skill to obtain the appropriate clamping force, and if the clamping force is too weak, there will be a shift between the core layers, and if it is too strong, the silicon steel plate will not be clamped evenly as shown in Figure 2. As a result, mechanical stress is applied locally, creating unevenness on the end face of the core laminate, causing noise and vibration. In addition, if the nut loosens due to vibration or the like and the nut falls off, causing the silicon steel plate to fall off, this will be a fatal defect, so there is a drawback that a great deal of effort is required to prevent this. On the other hand, in the stacked core structure of a reactor, in order to improve the properties of the block core, it is not necessary to fix it with tightening studs as shown in Figure 1b.
There is an adhesive core impregnated with resin etc. as shown in the figure below.

As shown in FIG. 3, this is a method in which rectangular silicon steel plates without holes are laminated and the core layers are impregnated and bonded with resin or the like. (2) Since there are no bolt holes, this has poor workability and good magnetic properties, but the iron core may crack or peel off due to the following reasons, making it unreliable. That is, when adhesion is achieved by impregnating and curing the iron core with resin, if the viscosity of the resin is high, the permeability of the resin into the laminated surface of the iron core is poor and the mechanical strength of the laminated surface is low when the resin is cured.

On the other hand, when the viscosity of the resin is lowered, its permeability to the laminated surface becomes poorer, and the mechanical strength of the laminated surface becomes higher [-, but the adhesion of the resin to the core surface is lower than when using a high-viscosity resin. Because of its inferiority, it is vulnerable to external shocks and mechanical forces generated during machining, and the galley laminated surface at the end of the core tends to crack, resulting in poor reliability.

In particular, as shown in Fig. 4, if the steel plate 1a at the end becomes loose due to galling, and this steel plate 1a falls off and causes a short circuit with the adjacent block 1, iron loss increases or the iron core is damaged by circulating current. As a result, such as loss or loss of required reactance characteristics,
In some cases, the reactor lost its function. The present invention is a gapped reactor with a stacked core structure formed by resin impregnation and hardening, and even if the core should crack or become loose, the steel plate can be prevented from falling off, thereby providing a highly reliable gapped reactor. The purpose is to provide the following.

An embodiment of the present invention will be described below with reference to FIG. 5, FIG. 6A, and FIG. 6B.

FIG. 5 is a perspective view showing an embodiment of the present invention. In the figure, 11 is a block iron-poor core formed by laminating silicon steel plates and hardened by resin impregnation, and 12 is a gap insulation intervening in the gap between each block iron core 11. 13 is the upper yoke core, 14
is the lower yoke core, 15 is the core upper and lower tightening stud, 16
1 is an insulating cylinder, 17 is an upper clamp metal fitting, 18 is a lower clamp metal fitting, and 19 is a coil. The fork in FIG. 6a is a view along the line X--X in FIG. 5. That is, the lower clamp hardware 18
Place the lower yoke core 14 on top, and then install the gap insulator 1.
2 and block iron core 11 are stacked alternately. After placing the uppermost block core 11, the coil 18 wound around the insulating tube 16 is inserted into the core legs made of the plurality of block cores 11 and gap insulators 12, and the upper yoke core 3a is placed. Further, after placing the upper clamp hardware 17, the core upper and lower clamping studs 15 are passed through adjacent to both sides of the core legs, and the upper and lower clamp hardware 17, 18 are tightened with nuts 193. Here, as shown in FIG. 6b, the gap insulator 12 is formed into a shape bent upward at both ends of the block core 11 in the steel plate lamination direction, and the core upper and lower tightening studs 5 are contacted on the outside of the bent portion. 4.
With such a configuration, the block core 11 and the gap insulators 12 bent upward at the ends in the steel plate stacking direction are alternately laminated, and the cores are tightened vertically on the outside of the bent portions of the gap insulators 12. By arranging the studs 15 and further arranging the insulating cylinder 6 on the outside thereof, the steel plate that has broken off from the block core 11 will be caught on the upwardly bent part of the gear insulator 12 and will not fall off, thereby preventing short circuits between the block cores 11. will not occur.

At the same time, the core upper and lower tightening studs 15 in contact with and adjacent to the bent portion of the gear insulator 12 prevent the bent portion of the gear insulator 12 from opening outward, while the insulating tube 16 prevents the bent portion of the gear insulator 12 from opening outward. This prevents the steel plate from falling off and not slipping off to the left or right. It should be noted that the present invention is not limited to the above-mentioned embodiment. For example, in FIG. It may also be shaped to bend.

In addition, the iron core upper and lower tightening studs 15 are provided with gap insulators 12.
It does not necessarily have to be in contact with the bent portion, but may be placed near the bent portion within the range of the protruding length of the bent portion. As described in detail above, according to the reactor having the iron core structure of the present invention, even when cracking or peeling of the block iron core occurs, it is possible to prevent the steel plate of the block iron core from falling off, and to provide a highly reliable reactor with a gap.

[Brief explanation of drawings]

Figures 1A and b are perspective views showing an example of the core structure of a reactor with a gap, Figure 2 is a sectional view of a block core with a bolt tightening structure, and Figure 3 is a perspective view of a block core bonded by impregnation with resin, etc. , FIG. 4 is a diagram illustrating a state in which a steel plate falls off due to cracking of the block core, FIG. 5 is a perspective view showing an embodiment of the present invention, and FIG. 6 a is a view taken along the line X--X in FIG. 5. , 6th
Figure b is a view taken along the line Y--Y in Figure 6Af). 11... Block iron core, 12... Gap insulator,
13... Upper yoke iron core, 14... Lower yoke iron core, 15... Iron core upper and lower tightening studs, 16... Insulating tube, 11... Upper clamp hardware, 18... Lower clamp hardware, 19 ···coil.

Claims (1)

[Claims] 1 Block iron blocks with a stacked iron core structure formed by resin impregnation and curing are stacked with gap insulators in between to form a core leg, a coil is wound around this core leg, and a coil is placed between the coil and the iron core leg. In a reactor with a gap in which iron core upper and lower tightening studs are provided and the iron core legs are tightened in the vertical direction, the gap insulator is bent upward at both ends of the block iron core in the steel plate lamination direction, and the iron core upper and lower tightening studs are A reactor with a gap, characterized in that the reactor is placed in contact with or in the vicinity of the bent portion of the gap insulator.