JP2009253011A - Reactor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reactor which makes the noise of instrument reduced. <P>SOLUTION: A reactor has an E-type iron core 1 and an I-type iron core 2, which are made to mutually face and laminate. A air gap 5, which adjusts the current characteristic of an inductance, is formed between a central magnetic leg 1a of the laminated E-type iron core 1 and the I-type iron core 2 which is arranged so as to face the laminated E type iron core 1. A coil 3 is wounded around the center magnetic leg 1a of the laminated E-type iron core 1 via an insulating paper 4. The tip of the central magnetic leg 1a of the E-type iron core 1 is made into a convex shape. The maximum vale of magnetic oscillation generated in the air gap 5 between the E-type iron core 1 and the I-type iron core 2, which are made to face and laminate is reduced by impregnating varnish. Noise which is caused by the factor is reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

Conventionally, as this type of reactor, the end of the central magnetic leg of the laminated E-type iron core has a rectangular shape. (See Patent Document 1). FIG. 3 shows a perspective view of a conventional reactor described in the above document. In FIG. 3, from the enameled wire in which the insulating paper 4 constituting the insulating means is arranged around the central magnetic leg 1a of the laminated E-type iron core 1 in which the tip of the central magnetic leg 1a of the E-type iron core 1 has a rectangular shape. The laminated E-type iron core 1 and I-type iron core 2 were butted so as to form an air gap 5, fixed by welding, and impregnated with varnish.
Japanese Utility Model Publication No. 6-31122 (FIG. 13)

  However, in the conventional configuration, since the iron core magnetic path length becomes shorter as it approaches the coil side, the magnetic flux inside the iron core is concentrated on the coil side of the iron core having a small magnetic resistance when the alternating current flows, and the air gap portion faces. Magnetic vibration due to NS magnetic attraction generated between the laminated E-type iron core and I-type iron core becomes large, and there is a problem that the noise of the equipment is large due to the above factors.

  In order to solve the above-described conventional problems, an object of the present invention is to provide a reactor in which the tip of the central magnetic leg of the laminated E-type iron core has a convex shape to reduce the noise of equipment.

  In order to solve the above problems, the reactor of the present invention has a convex structure at the tip of the central magnetic leg of the laminated E-type iron core.

  The reactor of the present invention can reduce the noise of equipment by reducing the magnetic vibration.

  The present invention can reduce the noise of equipment by making the tip of the central magnetic leg of the laminated E-type iron core have a convex structure.

  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 plan view of an iron core punched out according to Embodiment 1 of the present invention. 1 and 2, the same components as those in FIG. 3 are denoted by the same reference numerals and description thereof is omitted.

1 and 2, an iron core in which a structure of a central magnetic leg 1a in which a magnetic steel sheet hood is punched out by a continuous mold in a known method with excellent yield is laminated with an arc-shaped E-shaped core 1 is laminated. A coil 3 made of an enameled wire around which an insulating paper 4 made of aromatic polyamide paper or the like is wound is wound around the central magnetic leg 1a of the laminated E-type iron core 1 and the continuous metal disposed opposite thereto. An air gap 5 that adjusts the current characteristics of the inductance is formed between the laminated I-type iron core 2 punched with a die, and the two butted parts of the laminated E-type core 1 and I-type iron core 2 are welded. And then impregnating with varnish such as unsaturated polyester.

  As a result, the length of the iron core magnetic path and air gap forming the magnetic path of the reactor becomes shorter at the end of the central magnetic leg of the E-type iron core near the coil, and the latter becomes longer. By selecting an appropriate convex shape so that the magnetic resistance in the central magnetic leg of the E-type iron core obtained by the sum of the two is uniform, the magnetic flux distribution in the central magnetic leg of the E-type iron core when the alternating current flows is also uniform. As a result, the maximum magnetic flux density in the central magnetic leg of the E-type iron core is lowered, and the maximum value of the NS magnetic attractive force generated between the central magnetic leg of the E-type iron core and the I-type iron core is lowered.

  As a result, the maximum value of magnetic vibration is reduced and magnetic noise is reduced without lowering the average magnetic flux density of the core, such as increasing the cross-sectional area of the central magnetic leg of the E-type core, which increases the size of the known reactor and increases costs. it can.

  Furthermore, since there is no conventional sharp edge in the center magnetic leg of the E-type iron core, there is also an effect of suppressing a breakdown voltage failure due to the occurrence of insulation paper damage due to the edge when the coil is inserted into the center magnetic leg of the E-type core.

  Even if the central magnetic leg of the E-type iron core is trapezoidal, the maximum magnetic flux density in the central magnetic leg of the E-type iron core can be reduced, so that the effect of reducing the equipment noise is obtained.

  Since the reactor of the present invention can reduce noise due to magnetic vibration from the air gap portion, it can also be applied to the use of an inductor for equipment using a laminated core.

Side surface sectional drawing of the reactor in Embodiment 1 of this invention Iron core punching plan view in Embodiment 1 of the present invention Perspective view of conventional reactor

Explanation of symbols

1 E-type iron core 1a E-type iron core central magnetic leg 2 I-type iron core 3 Coil 4 Insulating paper 5 Air gap

Claims (1)

An air gap that has an E-type iron core and an I-type iron core laminated together and adjusts the current characteristics of the inductance between the central magnetic leg of the laminated E-type iron core and the I-type iron core disposed opposite thereto The coil is wound around the central magnetic legs of the laminated E-type iron cores through insulating paper, and the tip of the central magnetic leg of the E-type iron core has a convex shape and is impregnated with varnish .

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