JP3552745B2 - Manufacturing method and metal fittings for split core - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a split-type iron core preparation and fitting for use in the iron core of the current detecting current transformer, particularly zero-phase current transformer that requires high magnetic permeability, current transformer, a magnetic amplifier TECHNICAL FIELD The present invention relates to an advantageous method for manufacturing a large-diameter iron core used for a current transformer and a metal fitting used for the method.
[0002]
[Prior art]
Conventionally, in the manufacture of a split-type iron core using a high-permeability material, such as permalloy, silicon steel plate, or amorphous, a thin plate 12 slit to a predetermined width as shown in FIG. For the purpose of performing magnetic heat treatment after forming the wound core 13 and preventing deformation at the time of cutting and peeling of the thin plate at the cut portion, the material is impregnated or molded with varnish or epoxy resin and then cut with a grindstone. Further, in connection of the cut and divided cores, a non-magnetic band 14 made of stainless steel or the like is wound around an outer periphery of the cores after the cores are butted and fixed. However, despite the use of high-permeability materials, the split-type iron cores manufactured by these methods are subject to the stress applied to the iron core when the entire iron core is impregnated or molded with resin. In this case, there is a problem that the relative magnetic permeability is greatly reduced due to the stress applied to the iron core. In the case of an iron core having a small cross-sectional area, the butt area is small, so that the butt positioning and adjustment require man-hours, and the butt is unstable and a gap is likely to be generated. Had become. Therefore, in the case of permalloy, which is characterized by high magnetic permeability, the relative magnetic permeability is greatly reduced after cutting, and almost no split type iron core of the cutting method has been produced.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of such circumstances, and the problem to be solved is to cut the iron core using a high magnetic permeability material without applying stress as much as possible, and to be able to securely fasten the core. relative permeability is to provide a chromatic Convenient preparation and fitting of the split type iron core does not decrease.
[0004]
[Means for Solving the Problems]
The present invention relates to (1) have at least two Kesho or more divided positions on the iron core, to each of the divided portions of the iron core, split-type iron core that have a pair of brackets having both connected to the fixed of the core a method of manufacturing, and integrated by fixing the bracket to each of the divided portions of advance the core, then cut into Kikin tool before integrated with the core, to become again connecting the fitting the process for the manufacture of the split mold cores, wherein, a (2) and the groove for embracing the iron core, a pair of core fixing bracket having means for fixing the core in a direction orthogonal to the circumferential direction of the core Te, after dividing is fitting, characterized in that it comprises means for connecting the iron core in the circumferential direction.
[0005]
[Action]
The stress applied to the core at the time of cutting the core is limited to the portion where the fixture is fixed, and even in the butt connection, since the core can be reliably connected without applying stress to the core, a decrease in relative permeability can be reduced.
[0006]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows the overall appearance of a split-type iron core according to the present invention, in which the core shape is a track shape, 1 is an iron core, 4 is a fixing of the iron core at the time of cutting the iron core, and a butt connection after cutting. An outer metal fitting 7 is an inner metal fitting.
FIG. 2 also shows the overall appearance of the split iron core of the present invention, in which the iron core shape is an annular shape, 1 is an iron core, 4 is an outer peripheral metal fitting, and 7 is an inner peripheral metal fitting.
FIG. 3 shows a method of enclosing an iron core using the split-type iron core bracket of the present invention. As shown in FIG. 3 (a), the outer peripheral surface 2 of the iron core and the outer peripheral metal fitting 4 and the inner core are used. The core 1 is held in the recessed grooves 15 and 16 of the metal fittings by the inner metal fittings 7 from the peripheral surface 3. Then, as shown in FIG. 3 (b), the metal fittings are fixed to the iron core using fixing holes 5a and 5b (tap holes in FIG. 3 (b)) and screws 8 provided in a direction orthogonal to the iron core circumferential direction. Sticks to When holding the iron core with the metal fittings, it is preferable to impregnate the core with the epoxy resin or the like only in advance in order to prevent stress on the iron core. Also, it is certain that it is used in combination with an adhesive. The size of the metal fitting is selected such that when the metal fitting is fixed to the iron core, the inner circumferential metal fitting 7 and the outer metal fitting 4 do not short-circuit for one turn, and the screw 8 for fixing the metal fitting is made of plastic or the like. It is necessary to use a non-conductive material. Reference numeral 10 denotes a cutting position after the metal fitting is fixed.
FIG. 4 is a perspective view of an iron core divided part showing a method of joining and connecting iron cores after cutting, and as shown in FIG. 4 (a), connecting holes 6 provided in parallel with the grooves of the metal fittings. Is connected using a connecting screw 9 and a nut 11. FIG. 4B shows a state in which the parts are connected to each other. FIG. 5 shows the 50 Hz exciting current characteristic of the large-diameter split iron core using the 78% nickel permalloy material manufactured by the method of the present invention, so that the exciting current value is about 1 / compared to that manufactured by the conventional method. 5
The metal fitting of the present invention is preferably made of a material that is nonmagnetic and hardly generates rust, but may be made of a synthetic resin. When a synthetic resin is used, there is an advantage that a short-circuit does not occur for one turn.
[0007]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, when cutting and assembling and connecting an iron core, there is little deterioration in relative magnetic permeability, a good performance close to the magnetic properties of the material used, and an easy-to-assemble split core is obtained.
[Brief description of the drawings]
FIG. 1 is an overall explanatory diagram of a split-type iron core according to the present invention in a case where a core shape is a track shape. 1A is a plan view, and FIG. 1B is a side view.
FIG. 2 is an overall explanatory diagram in the case of a split-type iron core according to the present invention, in which the iron core shape is an annular shape. 1A is a plan view, and FIG. 1B is a side view.
FIG. 3A is a perspective view showing a method of clamping an iron core division with a metal fitting of the present invention, and FIG. 3B is a perspective view showing a method of fixing the metal fitting of the present invention to the iron core division.
FIG. 4 (a) is a perspective view showing a butt-joining method after splitting of the split-type core of the present invention, and FIG. 4 (b) is butting and connecting after splitting of the split-type core of the present invention. The perspective view showing a state.
FIG. 5 is a diagram comparing the excitation current characteristics of the split core of the present invention and the split core manufactured by a conventional method.
FIG. 6 is a perspective view showing a conventional method of manufacturing a split core and its configuration.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Iron core 2 Outer peripheral surface of iron core 3 Inner peripheral surface of iron core 4 (Outer peripheral side) Metal fittings 5a, 5b Fixing hole 6 Connecting hole 7 (Inner peripheral side) metal fitting 8 (Fixing metal fitting) screw 9 (Connecting) screw 10 Cutting position 11 (for connection) Nut 12 Thin plate 13 Winding core 14 Non-magnetic band 15, 16 Groove (of metal fittings)

Claims (2)

Having at least two Kesho or more divided positions on the iron core, to each of the divided portions of the iron core, a manufacturing method of a split core having a pair of brackets having both fixed and a connection of said iron core, advance the core each divided portion by fixing the fitting integrated in, then cut into Kikin tool before integrated with the core, the manufacturing method of the split mold core characterized by comprising again connecting the fitting . A groove for embracing the iron core, a pair of core fixing bracket having means for fixing the core in a direction orthogonal to the circumferential direction of the core, means for connecting the iron core in the circumferential direction after splitting Metal fittings characterized by having.

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