JPS5915466Y2 - Iron core reactor with gap - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a geared core type reactor in which a gap is provided in the leg core.

In order to increase the effective cross-sectional area of the conventional leg core of this type of reactor, the core elements 1.1', 1 are made by laminating thin steel plates of different widths to an arbitrary thickness, as shown in Fig. 1. ”・
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However, with this configuration, as is clear from the figure, it is necessary to prepare multiple types of thin steel plates with different widths, each of which has a cross section approaching a circle, and it is difficult to manufacture and prepare the thin steel plates with different widths. In addition to requiring a great deal of time and effort, some of the magnetic flux passing through the opposing gaps of each core block 2-2 protrudes from the opposing surfaces of each core block 2-2, and some of these leaked magnetic fluxes are shown by the arrows. As shown in the figure, the thin steel plates enter and exit from the flat side in the laminating direction, and as a result, eddy currents are generated in that part, increasing stray loss in the leg core and generating heat locally. Ta.

In addition, in order to minimize the influence of the above-mentioned eddy current, as shown in FIG. 2, thin steel plates of different widths are laminated so as to coincide on one side of each thin steel plate to form a part of the iron core element 4. By arranging a plurality of groups of core elements 4 radially to form a so-called radial core block 5 with a circular cross section,
There is one in which the laminated ends of each thin steel plate are located on the outer periphery.

However, this configuration requires many types of thin steel plates with different widths, and requires more time and effort to manufacture and prepare the thin steel plates than the stepped shape mentioned above. Arranging them so that they have a circular cross section requires very advanced technology, making the production even more complicated.

In view of the above-mentioned matters, this idea was developed by squeezing a large number of thin steel plates fixed radially around a solid central shaft in the center, and forming each of these thin steel plates into an involute curve, that is, a thread. By using a core block that has a shape like a curve drawn when unwinding from a circle, and whose outer circumference is measured with a fixed band, the influence of leakage magnetic flux on the opposing surface of the core block can be reduced compared to the conventional radial shape. The objective is to minimize the number of thin steel plates used in the leg cores, and to improve workability.

The following explanation will be given based on FIGS. 3 and 4 showing an embodiment of this invention. Reference numeral 10 indicates an iron core block 20, which will be described later, and a gap spacer made of an insulating material such as a Bakelite plate, a pressed board, or a synthetic resin plate. This is a leg core formed by stacking a plurality of 30 pieces.

11 is a yoke made of laminated rectangular iron plates, thin steel plates such as silicon steel plates, and 12 is a coil.

According to this idea, the iron core block 20 has a large number of thin steel plates 21 made of rectangular iron plates, silicon steel plates, etc. arranged radially around a central axis 22 made of solid iron, stainless steel, etc. , the central shaft 22 and a piece 21' of the thin steel plate 21 that abuts the central shaft 22 are fixed by welding or the like, and this is fixed using a groove 23 provided in the center of the central shaft 22 with a jig, or The thin steel plates 21 are rotated to form an involute curve, and the outer periphery is fixed by a fixing band 13 to form an iron core block 20.

This core block 20 is bonded together with a thermosetting resin such as epoxy resin, either alone or together with a gap spacer 30 as a leg core 10, as required.

Further, the outer periphery of the iron core block 20 may be fixed with a fixing band 13 made of an insulator, for example.

It is preferable that the central shaft 22 is made of a non-magnetic metal such as stainless steel or brass, since this reduces the influence of leakage magnetic flux.

With the above configuration, each thin steel plate 21 is arranged at a certain angle with respect to the leakage magnetic flux protruding from the opposing surface of the iron core block 20-20, and the leakage magnetic flux is directed to the flat side of each thin steel plate 21. It never comes at a right angle.

As a result, the generation of eddy currents in this portion is almost eliminated, and an increase in stray loss and local heating of the leg core 10 are suppressed.

Moreover, only one type of thin steel plate 21 can be used to form one core block 20.

Therefore, if the dimensions in the height direction of each core block 20 are all the same, the leg core 10 can be constructed using only one type of thin steel plate 21.

Furthermore, if the dimensions in the height direction are set to N types, it is sufficient to prepare N types of thin steel plates 21, and the types of thin steel plates can be minimized.

Further, by preparing rectangular thin steel plates 21, fixing these thin steel plates 21 radially to the central shaft 22, and squeezing the thin steel plates 21 inside, each thin steel plate 21 can be formed into an involute curve shape. Therefore, the work can be carried out more easily and efficiently than in the case where each thin steel plate 21 is shaped in advance by press working and a large number of these sheets are assembled to form an iron core block.

5 to 7 show other embodiments of this invention.

That is, even if each thin steel plate 21 is arranged at a certain angle with respect to the leakage magnetic flux as described above, the leakage magnetic flux is concentrated at the inner and outer corners of each iron core block 20. It is difficult to completely eliminate the increase in eddy currents, so in the embodiment shown in the figure, the concentration of leakage magnetic flux at the corners is reduced and the distribution of leakage magnetic flux is made uniform.

The following explanation will be given based on FIGS. 5 to 7. The involute curved thin steel plate 21 forming the iron core block 20 is formed at both corners or four corners of the piece, as shown in the developed view in FIGS. 7A to 7C. A linear or arcuate notch 24 is provided at the core block 20, and the notch 24 is located on one or both of the outside and inside of the core block 20, and a notch 25 is provided at the corner of the core block 20. ing.

In addition, the height of the center shaft 22 is lower than that of the thin steel plate 21 fixed thereto, and the height of the center shaft 22 is arranged at the center of the thin steel plate 21 in the height direction, thereby reducing the influence of leakage magnetic flux. We are trying to

Further, each core block 20 has a gap spacer 30 that fits into a groove 23 provided in the center of the central shaft 22 or a fitting piece (groove 23-) formed separately from the gap spacer 30 (not shown). 23), are assembled together with the upper and lower yokes 11, and are tightened with fastening fittings 14, studs 15, 16, etc.

In the figure, 31 is a fixed shaft partially inserted into the yoke 11, 32 is a wedge, and 16 is a metal fitting for holding down the coil 12.

As detailed above, according to this invention, the flat side of the thin steel plate is arranged at a certain angle with respect to the leakage magnetic flux, and even if leakage magnetic flux enters and exits the iron part, losses due to eddy currents are extremely reduced. Local heating can be prevented and the space factor can also be improved.

Furthermore, the number of types of thin steel sheets is kept to a minimum, and they can be formed into an involute curve shape very easily, simplifying the production and preparation of the thin steel sheets and greatly improving the work efficiency.

Furthermore, since a large number of thin steel plates are fixed to a solid central shaft, the mechanical strength of the iron core block itself can be increased, and it will not be destroyed by electromagnetic force in the event of an abnormality.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views and plan views showing different configurations of conventional leg cores, Figure 3 is a schematic configuration diagram showing one embodiment of this invention, and Figure 4 is shown in Figure 3. Top view of the core block used in the geared core reactor,
FIG. 5 is a plan view showing a part of another embodiment of this invention, and FIG. 6 is a sectional view taken along the line A-A' in FIG. FIG. 10... Leg core, 11... Yoke, 1
2... Coil, 13... Fixed band,
20... Iron core block, 21... Thin steel plate, 22... Center shaft, 23... Groove, 2
4... Notch, 25... Notch, 30.
...Gap spacer.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A large number of thin steel plates fixed radially to a solid central shaft arranged in the center of the ocean are squeezed inward to form each of these thin steel plates into an involute curve shape. An iron core reactor with a gear lug, characterized in that a leg core is formed by stacking a plurality of iron core blocks whose outer peripheries are fixed with fixing bands via gap spacers. 2. The gear according to claim 1, wherein the height of the off-center shaft is lower than that of the thin steel plate to which it is fixed, and the gear is disposed at the center of the thin steel plate in the height direction. Iron core type reactor. 3. An iron-core noaktor with a gear according to claim 1 or 2 of the utility model registration claim, wherein the off-center shaft is made of a non-magnetic metal. 4. An iron core reactor with a gear according to claim 3, wherein the non-magnetic metal is stainless steel. 5. An iron core reactor with a gear lug according to claim 1, wherein a groove is provided in the center of the off-center shaft. 6. An iron core reactor with a gear lug as set forth in claim 1 or 2 of the utility model registration claim, in which a notch is provided at the outer corner of the iron core block. 7. An iron core reactor with a gear as set forth in claim 1 of the utility model registration, wherein a notch is provided in the inner corner of the iron core block. 8. An iron core reactor with a gear lug according to claim 6 or 7 of the utility model registration claim, wherein the notch is an arc. 9. An iron-core reactor with a gear according to claim 1 or 2, in which a plurality of thin steel plates forming the iron core block are bonded together with thermosetting synthetic resin. 10. The geared core reactor according to claim 1 or 2, wherein the core block forming the leg core and the gap spacer are bonded together with a thermosetting resin.