JP2008235529A - Reactor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive reactor that matches the size of an apparatus side demand. <P>SOLUTION: The reactor includes a laminated E-type iron core 1 and a laminated I-type iron core 2, both of which are arranged to face each other, wherein: an air gap 5 for adjusting magnetic saturation characteristics is formed between a central magnetic leg 1a of the laminated E-type iron core 1 and the laminated I-type iron core 2 arranged opposite thereto; and a coil 3 is wound around the periphery of the central magnetic leg 1a through an insulating paper 4. The coil 3 is serially connected by using a coil 3a and a coil 3b, thereby reducing an unit cost of raw materials compared with the case of using a coil that makes single copper serve as a conductor, wherein copper and aluminum in which an enamel film is baked on the surface of the coil 3a and the coil 3b, respectively, serve as the conductor. A small core with a short magnetic path length can be used compared with the case of using the coil in which a single aluminum serves as the conductor, thereby matching the size of the apparatus side demand and achieving low cost. <P>COPYRIGHT: (C)2009,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, a coil using either copper or aluminum with an enamel film baked on its surface as a conductor has been wound (for example, see Patent Document 1).

FIG. 3 shows a perspective view of the conventional reactor described in the above document. In FIG. 3, a coil 3 made of copper or aluminum as a conductor is disposed around the central magnetic leg 1 a of the laminated E-type iron core 1. The laminated I-type iron core 2 was abutted so that the air gap 5 was formed, and was fixed by welding.
Japanese Utility Model Publication No. 6-31122 (FIG. 13)

  However, in the conventional configuration, when copper is used as a conductor, the unit price of the material is more expensive than when aluminum is used as a conductor, and when aluminum is used as a conductor, the maximum temperature of electrical insulation is regulated by law. In order to control below the temperature limit of the class, the conductor diameter must be increased to match the resistivity compared to the case where copper is used as a conductor, and the iron core becomes larger and cannot be mounted on equipment. It was.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an inexpensive reactor that conforms to a required size of a device having required inductance.

  In order to solve the above problems, the reactor of the present invention has a coil structure in which a coil having copper as a conductor and a coil having aluminum as a conductor are used in combination and connected in series.

  The reactor of the present invention can be reduced in size at a relatively low cost according to the dimensions required by the equipment.

  According to the present invention, by using a coil structure in which the coil made of copper and the coil made of aluminum are connected in series, the coil can be reduced in size relatively to the required dimensions on the equipment side.

  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 shows a side sectional view of a reactor according to Embodiment 1 of the present invention, and FIG. 2 shows a side sectional view of another reactor 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.

In FIG. 1, a coil 3a having copper as a conductor, on which the enamel film is baked on the surface, and aluminum on which the enamel film having a conductor cross-sectional area having the same resistance value per unit length as the coil 3a is baked on the surface The coil 3b is wound separately, one end of both is connected in series by soldering or the like so that the winding direction coincides, the inner diameter of the coil is matched, and the insulating paper 4 made of aromatic polyamide paper or the like is wound The air gap 5 is formed between the central magnetic leg 1a of the laminated E-type iron core 1 and the I-type iron core 2 disposed opposite to the central magnetic leg 1a. The two butted portions of the iron core 1 and the I-type iron core 2 are fixed by a method such as welding.

  In FIG. 2, a coil 3b having a conductor made of aluminum baked on the surface thereof is coaxially wound on a coil 3a having a conductor made of copper baked with an enamel film on the surface thereof. The number of turns required for the inductance characteristics determined by the total number of turns of the coils 3a and 3b is set so that the number of turns of the coil 3b using aluminum as a conductor is the maximum value that can be inserted into the dimensions in the iron core window. .

  As a result, if the cross-sectional area of the coil 3 using the conventional copper alone and the cross-sectional area of the coil 3a are the same, the total DC resistance value of the coil 3a and the coil 3b is the coil using the conventional copper alone as the conductor. It is equivalent to 3, and the maximum temperature of the electrical insulation can be secured with a temperature equivalent to the temperature limit of the insulation class stipulated by law, and aluminum, which is cheaper than copper, is used as part of the conductor. Because it is used, it is inexpensive.

  Further, since copper having a smaller cross-sectional area is used as a part of the conductor than the conventional coil 3 made of aluminum alone, the size in the iron core window can be reduced, and a small iron core with a short magnetic path length can be used. . Moreover, since the number of turns of the coil 3a and the coil 3b is set so that the coil occupying ratio in the iron core window becomes the maximum when the current flows in, there is no air layer between the coil and the iron core via the insulating paper 4. Increases, heat conduction from the coil to the iron core improves, heat dissipation from the iron core increases, and the temperatures of the coils 3a and 3b decrease.

  As a result, the temperature of the electrical insulation material can be further increased with respect to the temperature limit of the insulation class stipulated by law, and even if the cross-sectional area of the coil 3a and the coil 3b is reduced and the DC resistance value is increased, it is legal. The temperature limit specified by can be cleared and the amount of conductor used can be reduced.

  Although the same effect may be obtained even if the coil 3a and the coil 3b are connected in parallel, the number of turns of the coil 3a and the coil 3b must be matched, and the number of turns cannot be freely selected. Is thin.

  As a result, it is possible to make the reactor small in size according to the dimensions required by the device, relatively inexpensively.

  The reactor of the present invention can be applied to the application of an inductor / transformer for a device using a laminated core because the reactor meets the requirements of the device and can be made inexpensive.

Side surface sectional drawing of the reactor in Embodiment 1 of this invention Side surface sectional drawing of the other reactor in Embodiment 1 of this invention Perspective view of conventional reactor

Explanation of symbols

1 Laminated E-type iron core 1a Central magnetic leg iron core 2 Laminated I-type iron core 3 Coil 3a Coil A
3b Coil B
4 Insulating paper 5 Air gap

Claims (1)

An air gap is formed between the central magnetic leg of the laminated E-type iron core and the laminated I-type iron core arranged opposite to the laminated E-type iron core. A reactor in which a coil is wound around an insulating paper around the central magnetic leg, and the coil is baked on the surface with a coil having a copper conductor and an enamel film baked on the surface. A reactor characterized in that coils made of aluminum are connected in series.

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