JP2013004761A - Reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-weight and inexpensive reactor capable of reducing mechanical noise due to electromagnetic vibrations.SOLUTION: The reactor has an E-shaped iron core 1 and an I-shaped iron core 2 each formed in a multi-layer abutting on each other. Between a central magnetic leg 1a of the E-shaped iron core 1 and the I-shaped iron core 2 which is disposed facing thereto, an air gap 7 is formed for adjusting current characteristics of the inductance, and a spacer 5 is disposed to the air gap 7. A coil 3 is wound on the central magnetic leg 1a being interposed by a piece of insulating paper 4. Winding start 6 at the inner diameter side of the coil 3 is formed in a step-like shape. The width dimension of the spacer 5 is larger than the width dimension of the central magnetic leg 1a, and the spacer 5 is impregnated with varnish. With a light-weight and inexpensive structure, a range where NS magnetic attraction generated between the E-shaped iron core 1 and the I-shaped iron core facing to each other is mechanically prevented is increased. Iron core magnetic vibrations due to the NS magnetic attraction generated between the E-shaped iron core 1 and the I-shaped iron core 2 is reduced; and thus, noise from the components due to the vibrations are reduced.

Description

  The present invention relates to a reactor used for power factor improvement such as an inverter air conditioner and an inverter heat pump water heater.

  Conventionally, in this type of reactor, the inner diameter surface of the coil is flat, and the spacer disposed in the air gap has a dimension equal to or less than the E-type core central magnetic leg width (see, for example, Patent Document 1).

  FIG. 3 shows a perspective view of the conventional reactor described in Patent Document 1. In FIG.

  In FIG. 3, a coil 3 having a flat inner diameter surface is wound around the central magnetic leg 1a of the laminated E-type iron core 1 with an insulating paper 4 disposed thereon, and the laminated E-type. The iron core 1 and the I-type iron core 2 are abutted so that an air gap 7 is formed, and a spacer 5 having a width dimension not exceeding the width of the central magnetic leg 1a of the laminated E-type iron core 1 is arranged in the air gap 7. Welded, fixed and impregnated with varnish.

Japanese Utility Model Publication No. 6-31122

  However, in the configuration of the conventional reactor, when the alternating current in which the pulse that makes the power factor improvement more effective is superimposed, the amount of magnetic flux in the iron core magnetic path suddenly increases during the pulse current superposition time, NS magnetic attraction generated between the laminated E-type iron core 1 and I-type iron core 2 is increased, the magnetic vibration of the iron core is increased, and there is a problem that the noise of the equipment due to the above is large, In order to take measures for reducing the magnetic flux density of the iron core, which reduces the known magnetic vibration energy per unit, it has become large and expensive.

  An object of the present invention is to solve the above-described conventional problems, and to provide a light-weight and inexpensive reactor with little electromagnetic vibration that contributes to reduction of noise in equipment.

  In order to solve the above-described conventional problems, a reactor according to the present invention has an E-type iron core and an I-type iron core formed to be abutted with each other and stacked, and opposed to the central magnetic leg of the E-type iron core. An air gap for adjusting the current characteristic of the inductance is formed between the I-type iron cores arranged, a spacer is provided in the air gap, and a coil is wound around the central magnetic leg via insulating paper. In addition, the winding start of the inner diameter surface of the coil has a staircase shape, the width of the spacer is larger than the width of the central magnetic leg, and is impregnated with varnish. Since the range of mechanically suppressing the NS magnetic attractive force generated between the E type iron core and the I type iron core is widened, the iron core magnetic vibration due to the NS magnetic attractive force generated between the E type iron core and the I type iron core is reduced. Cause vibration It is possible to reduce the noise of the equipment.

  The reactor according to the present invention has a light and inexpensive configuration, increases the effect of the vibration isolating spacer, and significantly reduces magnetic vibration without reducing the magnetic core magnetic flux density, which is a known measure, which reduces magnetic vibration energy per unit. Can be reduced.

Sectional drawing of the reactor in Embodiment 1 of this invention Cross section of the reactor coil Perspective view of conventional reactor

  A first invention includes an E-type iron core and an I-type iron core formed to be butted against each other, and a center magnetic leg of the E-type iron core and the I-type iron core disposed opposite thereto. An air gap that adjusts the current characteristics of the inductance is formed between them, a spacer is provided in the air gap, and a coil is wound around the central magnetic leg via an insulating paper, and the coil is wound around the inner diameter surface of the coil. The beginning is a staircase shape, and the width of the spacer is larger than the width of the central magnetic leg. The spacer is impregnated with a varnish, and is lightweight and inexpensive. Since the range of mechanically suppressing the generated NS magnetic attraction force is expanded, the iron core magnetic vibration due to the NS magnetic attraction generated between the E-type iron core and the I-type iron core is reduced, and the noise of the equipment caused by the vibration is reduced. Can be reduced .

  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 cross-sectional view of a reactor according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of coils constituting the reactor. In addition, about the same structure and components as the conventional reactor, the same code | symbol is used and the description is abbreviate | omitted.

  1 and 2, the reactor according to the present embodiment is an E-shaped electromagnetic steel sheet having a thickness of 0.5 mm, which is punched out by a known method with excellent yield, using a continuous metal mold. The E-type iron core 1 is laminated to form a step-shaped core around the central magnetic leg 1a of the E-type iron core 1. The coil 3 is wound through an insulating paper 4 made of aromatic polyamide paper or the like so that the winding start 6 of the inner diameter surface is on the end face side of the central magnetic leg 1a of the E-type iron core 1, A spacer 5 made of an insulating material such as PPS having a width dimension that is twice as large as the diameter of the enameled wire than the width of the central magnetic leg 1a is disposed in the air gap 7 on the upper surface of the central magnetic leg 1a of the E-type iron core 1. Above, a 0.5 mm thick I-shaped electrode punched with the continuous mold The steel sheet is laminated to form the I-type iron core 2, and the two butted portions of the laminated E-type iron core 1 and I-type iron core 2 are fixed by a method such as welding, and a thermosetting varnish such as unsaturated polyester is used. , Impregnated.

  According to the present embodiment, there is a mechanical vibration-proofing effect against magnetic vibration due to NS magnetic attraction generated in the air gap 7 between the stacked E-type iron core 1 and I-type iron core 2 facing when alternating current flows. Since the anti-vibration area of the spacer 5 is increased and the EI type magnetic path which is the present configuration form is a symmetrical parallel magnetic path, the magnetic flux concentrates on the end of the central magnetic leg 1a of the E type core 1, so that NS The end of the central magnetic leg 1a of the E-type iron core 1 having a large magnetic attractive force, including the variation in the mounting position of the spacer 5, is surely mechanically isolated, and the vibration isolation effect can be increased.

  As a result, magnetic vibration can be reduced without reducing the core magnetic flux density that reduces the magnetic vibration energy per unit, and the core magnetic flux density is inversely proportional to the core cross-sectional area. A simple reactor can be provided.

The reactor of the present invention can reduce noise due to magnetic vibration from the air gap portion, and can increase the magnetic flux density of the iron core and reduce the size thereof. Therefore, the reactor can also be applied to an inductor using a laminated iron core.

1 E-type iron core 1a Center magnetic leg 2 I-type iron core 3 Coil 4 Insulating paper 5 Spacer 6 Winding start 7 Air gap

Claims (1)

An E-type iron core and an I-type iron core, which are formed to be butted against each other, are formed between the central magnetic leg of the E-type iron core and the I-type iron core disposed opposite thereto. An air gap for adjusting characteristics is formed, a spacer is disposed in the air gap, a coil is wound around the central magnetic leg through an insulating paper, and the winding start of the inner diameter surface of the coil is a staircase shape. In addition, a reactor impregnated with varnish in which the width of the spacer is larger than the width of the central magnetic leg.