JP2010238874A - Reactor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reactor having improved safety by preventing safety from being spoiled accompanying lowering of vanish adhesive strength between iron core laminates due to aged deterioration when it is used in adverse environments. <P>SOLUTION: This reactor includes an I-shaped iron core 1 and a U-shaped iron core 2 composing a shell iron core, and a central magnetic leg iron core 3. The center sections 1a and 2a of laminates as the I-shaped iron core and the U-shaped iron core on the sides facing the central magnetic leg iron core are formed into a unified structure respectively by welding. Thus, swelling of the shell iron core caused by magnetic vibration can be mechanically suppressed, occurrence of short-circuit and smoke accidents between iron cores and coils due to aged deterioration can be reduced, and safety can be improved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a reactor used for power factor improvement such as an inverter air conditioner.

Conventionally, this type of reactor has not been a method of welding and integrating the laminated surfaces of the I-type iron core and the concave iron core facing the central magnetic leg iron core (see Patent Document 1). FIG. 3 shows a side cross-sectional view of a conventional reactor described in the above document. In FIG. 3, a coil 4 is wound directly around a central magnetic leg core 3 having a rectangular core in the concave core 2 constituting the outer core and having the same laminated thickness as that of the concave core 2, thereby forming an insulating means 5. After storing the coil unit wrapped with insulating paper, the I-type iron core 1 constituting the outer iron core was fixed by welding at the iron core abutting portion 6 from above and impregnated with varnish.
Japanese Patent Laid-Open No. 9-35965 (FIG. 1)

  However, in the conventional configuration, when used in a bad environment such as a salt damage area, red rust is generated in the iron core laminated portion, the varnish adhesion effect of the iron core laminated portion is lowered, and the adhesion force between the iron core laminated portions is reduced. As the I-type iron core and the concave iron core are laminated and fixed at the core butt, the I-type iron core and the concave iron swell greatly with the core butt as a fulcrum due to magnetic vibration. The coil was in direct contact and had the problem of causing a smoke accident due to a short circuit.

  In order to solve the above-mentioned conventional problems, the present invention provides a method of welding and integrating the laminated surfaces of the I-type iron core and the concave iron core on the side facing the central magnetic leg iron core, and mechanically encircling by magnetic vibration. An object of the present invention is to provide a reactor capable of suppressing the occurrence of a short-circuit smoke accident between an iron core and a coil due to aging deterioration by suppressing the swelling of the iron core.

  In order to solve the above-described problems, the reactor of the present invention has an integrated structure by welding the center of the laminated surface of the I-type iron core and the concave iron core on the side facing the central magnetic leg iron core.

  The reactor of the present invention can reduce the occurrence of a short-circuit smoke accident between the iron core and the coil due to aging.

  According to the present invention, the center of the laminated surface of the I-type iron core and the concave iron core on the side facing the central magnetic leg iron core is welded to form an integrated structure, thereby preventing a short-circuit smoke accident between the iron core and the coil due to deterioration over time. Occurrence can be reduced, and safety can be ensured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 is a side sectional view of a reactor according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view of an iron core of the reactor. 1 and 2, the same components as those in FIG.

  In FIG. 1, a central magnetic leg core 3 formed by laminating rectangular silicon steel plates is used as a core, a coil 4 made of enameled winding made of aluminum / copper is wound, and an aromatic polyamide paper also serving as a spacer is used. The insulating center 5 has a dimension capable of securing an insulation distance between the iron core and the coil specified by the law, forms a wound coil unit, and faces the central magnetic leg iron core 3 constituting the outer iron core. After the coil unit is placed in the integrated concave core 2, the laminated central portion 1a constituting the outer core is welded from above, and the integrated I-type core 1 has a central magnetic leg on the welding side. It arrange | positions at the side facing the iron core 3, is weld-fixed by the iron core butt | matching part 6, and is impregnated with the varnish which consists of unsaturated polyester etc.

  According to the present invention, even when red rust is generated in the iron core laminated portion due to use in a bad environment, etc., the varnish adhesion effect of the iron core laminated portion is reduced, and the fixing force between the iron core laminates is reduced. Since the laminated central portion 1a and the laminated central portion 2a of the concave iron core 2 are welded, black rust is formed in the welded portion by a high heat treatment method, and no red rust is generated in the laminated central portions 1a and 2a. Since the magnetic flux in the iron core due to the alternating inflow current is non-uniform for each iron single plate, the swelling of the I-type iron core 1 and the concave iron core 2 caused by the vibration generated by the NS magnetic attractive force difference between the iron core single plates It is mechanically restrained at the laminated central portions 1a and 2a, and can be prevented from being swollen within the creepage distance of the surface of the insulating paper that forms the electrical insulation between the iron core and the coil 4, and direct contact between the iron core and the coil 4 can be prevented. . In addition, although the said welding has an iron core swelling suppression effect even if it is not a center, the center is desirable from the magnetic flux balance in a division | segmentation magnetic path. The laminated central portions 1a and 2a also have an effect of mechanically suppressing noise caused by vibration caused by NS magnetic attraction between the outer iron core and the central magnetic leg iron core 3 generated by an inflow current during normal operation.

  As a result, it is possible to suppress a short circuit between the I-type iron core 1 and the concave iron core 2 and the coil 4, reduce the occurrence of smoke accidents due to the short-circuit current, and improve safety.

  Since the reactor according to the present invention can reduce short-circuit smoke accidents due to aging, it can also be applied to inductor applications using a laminated core.

Side surface sectional drawing of the reactor in Embodiment 1 of this invention Iron core perspective view in Embodiment 1 of the present invention Side sectional view of a conventional reactor

DESCRIPTION OF SYMBOLS 1 I type iron core 1a I type iron core lamination | stacking center part 2 Recessed iron core 2a Concave iron core lamination | stacking center part 3 Central magnetic leg iron core 4 Coil 5 Insulation means 6 Iron core butt | matching part

Claims (1)

An outer iron core formed using an I-type iron core and a concave iron core, a central magnetic leg iron core arranged through an insulating means inside the outer iron core, and a coil arranged around the central magnetic leg iron core A reactor characterized in that the center of the laminated surface of the I-type iron core and the concave iron core on the side facing the central magnetic leg iron core is integrated by welding.

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