JP2015026734A - Reactor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structurally simple reactor device rich in general-purpose properties and capable of inexpensively preventing overheating of winding.SOLUTION: A reactor device 100 comprises an iron core 10 that has a gap part G, and winding 20 that has an insulative coating arranged around the iron core 10 including the gap part G. The winding 20 is wound at a spatial distance from the iron core 10 having the gap part G.

Description

  The present invention relates to an improvement in a winding structure of a reactor device.

  The reactor device is a stationary device that uses the frequency characteristics of inductance. Reactor devices are usually provided with a gap (gap) in the iron core, except for a part called a dust core.

  In the reactor device, it is known that the magnetic flux leaked from the gap portion acts on the winding around the gap portion, and an eddy current is generated. When loss due to overcurrent occurs, the temperature of the winding increases. Heat generation due to eddy current is more likely to occur as the operating frequency of the reactor device is higher, and the insulating film of the winding is burned out in a short time when the reactor is overheated.

  Since the influence of the eddy current is proportional to the square of the distance of the gap portion, in order to prevent heat generation, the gap portion is divided into a plurality of pieces to reduce the distance of each gap portion. However, if an attempt is made to provide a plurality of gap portions in the iron core, a special iron core structure is formed, and the manufacturing cost of the reactor device increases.

  Conventionally, various techniques for preventing a temperature rise of the reactor device and winding burnout have been developed.

  For example, an EE transformer is disclosed in which a convex portion that prevents winding is provided at the bobbin central portion corresponding to the gap portion of the core (iron core), and no winding is applied to the convex portion. Reference 1). According to the technique of Patent Document 1, it is possible to provide an EE type transformer that suppresses a temperature rise due to leakage magnetic flux and has a small loss.

  Further, a reactor device is disclosed in which the winding density of the winding is wound more coarsely than other portions at a position corresponding to the magnetic gap portion of the core (see Patent Document 2). According to the technique of Patent Document 2, the loss due to the eddy current due to the linkage of the leakage magnetic flux is reduced by roughing the winding density of the winding in the outer peripheral range perpendicular to the magnetic path of the magnetic gap portion. The

JP-A-7-302720 JP 2012-79951 A

  By the way, the technique of patent document 1 requires the exclusive bobbin which has a convex part in the position corresponding to the gap part of a core, and manufacturing cost increases.

  Moreover, even if the winding density of the position corresponding to the gap part of a core is made rough in the technique of patent document 2, the local heat generation of the part which crosses a gap part is inevitable. When the operating frequency of the reactor device increases, heat generation that affects reliability occurs locally. Furthermore, in the mass production process of the reactor device, since it is impossible to visually check the uniformity and the internal state of the portion where the winding density is coarsened, there is a possibility that a problem occurs in the winding state.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reactor device that has a simple structure, is versatile, and can prevent overheating of the windings at low cost.

  In order to achieve the above object, a reactor device according to the present invention includes an iron core having a gap portion and a winding having an insulating film disposed around the iron core including the gap portion.

  The winding is wound at a spatial distance from the iron core having the gap portion.

  In the reactor device according to the present invention, since the winding is wound at a spatial distance from the iron core having the gap portion, the influence of the leakage magnetic flux in the gap portion does not easily affect the winding, and the general structure is simple and versatile. It is rich in properties and can prevent overheating of the windings at low cost.

It is a schematic sectional drawing of the reactor apparatus which concerns on Embodiment 1. FIG. It is a schematic sectional drawing of the other form in the reactor apparatus which concerns on Embodiment 1. FIG. It is a schematic sectional drawing of the reactor apparatus which concerns on Embodiment 2. FIG.

  Hereinafter, a reactor apparatus according to [Embodiment 1] and [Embodiment 2] will be described with reference to the drawings.

  [Embodiment 1] and [Embodiment 2] have a simple structure and high versatility by winding a winding at a spatial distance from an iron core having a gap portion. This is a reactor device that can prevent overheating.

[Embodiment 1]
[Configuration of reactor device]
First, with reference to FIG. 1, the structure of the reactor apparatus which concerns on Embodiment 1 is demonstrated. FIG. 1 is a schematic sectional view of a reactor device according to the first embodiment. FIG. 2 is a schematic cross-sectional view of another form of the reactor device according to the first embodiment.

  As shown in FIG. 1, the reactor device 100 according to the first embodiment includes an iron core 10 having a gap portion G and a winding 20 disposed around the iron core 10 including the gap portion G.

  An iron core 10 shown in FIG. 1 is an EE type iron core. At least one gap portion G is provided in the intermediate portion of the EE type iron core 10. The gap part G is formed by abutting the iron cores 10a and 10b with a gap therebetween.

  Examples of the constituent material of the iron core 10 include magnetic materials such as ferrite, electromagnetic steel sheets, and permalloy, but are not limited to the exemplified constituent materials. The iron core 10 may have a single-layer structure or a stack structure in which thin plates are stacked.

  Around the core 10 including the gap portion G, a cylindrical insulating bobbin 30 having flange portions 31 at both ends is provided. Examples of the constituent material of the insulating bobbin 30 include synthetic resins such as phenol, nylon, and PBT, but are not limited to the exemplified constituent materials. The iron core 10 is accommodated in the cylindrical body portion 32 of the insulating bobbin 30.

  As the winding 20, a conductive wire having an insulating film around a copper wire such as an enameled wire is employed.

  The winding 20 is wound at a spatial distance from the iron core 10 having the gap portion G. That is, normally, the winding 20 is wound around the cylindrical portion 32 of the insulating bobbin 30. However, in the reactor device 100 of the present embodiment, the winding 20 is wound around the cylindrical portion 32 of the insulating bobbin 30 via the insulator 40.

  Examples of the insulator 40 include an electrically insulating sheet made of a synthetic resin such as polyester or aramid fiber, but are not limited to the illustrated electrically insulating sheet.

  The thickness of the electrical insulating sheet is determined in consideration of the strength of the leakage magnetic flux, the number of turns of the winding 20, the gap G of the iron core 10, and the like.

  In the above embodiment, the electrical insulating sheet 40 is used as a means for separating the spatial distance from the iron core 10 having the gap portion G, but is not limited thereto.

  That is, as shown in FIG. 2, in order to correspond to mass production of the reactor device 100, the cylindrical body portion 32 is wound from the iron core having the gap portion G by winding the winding 20 around the thick insulating bobbin 30. May be separated from each other.

  Similar to the thickness of the electrical insulating sheet 40, the thickness of the cylindrical portion 32 of the insulating bobbin 30 takes into account the strength of the leakage magnetic flux, the number of turns of the winding 20, and the gap G of the iron core 10. To be determined.

[Operation of reactor device]
Next, with reference to FIG. 1 and FIG. 2, the effect | action of the reactor apparatus 100 which concerns on Embodiment 1 is demonstrated.

  The reactor device 100 according to the present embodiment includes an EE type iron core 10 having a gap portion G as shown in FIGS. When the reactor apparatus 100 according to the present embodiment is operated, magnetic flux leaks from the gap portion G of the iron core 10 and acts on the winding 20 around the gap portion, thereby generating eddy current.

  When the gap G is relatively small (for example, less than about 1 mm), the overcurrent flows between the iron cores 10a and 10b having the shortest distance. On the other hand, when the gap of the gap portion G is relatively large (for example, about 3 mm to 5 mm or more), if the distance between the iron core 10 and the winding 20 is short, the overcurrent bypasses the winding 20 around the gap portion. Try to flow.

  However, the winding 20 of the reactor device 100 according to the present embodiment is wound at a spatial distance from the iron core 10 having the gap portion G. Specifically, the winding 20 is wound around the cylindrical body portion 32 of the insulating bobbin 30 via the electrical insulating sheet 40. Alternatively, in order to correspond to mass production of the reactor device 100, the winding 20 is wound around the insulating bobbin 30 having the thick cylindrical portion 32.

  For this reason, the reactor device 100 according to the present embodiment arranges the winding 20 at a spatial distance from the iron core 10 having the gap portion G, so that the influence of the leakage magnetic flux in the gap portion G is applied to the winding 20. It has a winding structure that does not work easily.

  That is, according to the reactor device 100 according to the present embodiment, since the influence of the leakage magnetic flux in the gap portion G hardly acts on the winding 20, the winding of the winding 20 can be performed without performing the adjustment as described in Patent Document 2. Is simple and versatile, and can prevent overheating of the windings at low cost.

[Embodiment 2]
Next, the reactor device according to the second embodiment will be described with reference to FIG. FIG. 3 is a schematic cross-sectional view of the reactor device according to the second embodiment.
In addition, about the same component as Embodiment 1, it attaches | subjects and demonstrates the same code | symbol.

  As shown in FIG. 3, the reactor device 200 according to the second embodiment is different from the first embodiment in that an EI type iron core 210 is used.

  In the EI type iron core 210 of the present embodiment, three gap portions G are formed between the E type iron core 210a and the I type iron core 210b.

  Even in the second embodiment, the winding 20 is wound at a spatial distance from the iron core 210 having the gap portion G. That is, in the reactor device 200 of the present embodiment, the insulator 40 is provided so as to face each gap portion G of the EI type iron core 210 to ensure a spatial distance. The winding 20 is wound in a slot 60 other than the insulator 40.

  As the insulator 40 of this embodiment, an electrically insulating sheet called a barrier tape for securing a creepage distance is used. A gap between the gap portion G of the EI type iron core 210 and the winding 20 is secured by interposing an electrically insulating sheet facing each gap portion G of the EI type iron core 210. The action on the wire 20 can be suppressed.

  The thickness of the electrical insulating sheet is determined in consideration of the strength of the leakage magnetic flux, the number of turns of the winding 20, the gap G of the iron core 10, and the like.

  Although not shown, the periphery of the winding 20 is covered with an electrically insulating cylinder such as a mold resin.

  The reactor device 200 according to the second embodiment has basically the same functions and effects as those of the first embodiment. In particular, according to the reactor device 200 according to the second embodiment, the reactor device 200 having the EI type iron core 210 with a simple structure in which the insulator 40 for securing the creepage distance is provided facing the gap portion G. The overheating of the winding 20 can be prevented.

  As described above, when the reactor device according to the first embodiment and the second embodiment is compared with the conventional reactor device, the temperature rise is extremely reduced, and there is almost no possibility that the windings are burned out.

  The preferred embodiments of the present invention have been described above, but these are examples for explaining the present invention, and the scope of the present invention is not intended to be limited to these embodiments. The present invention can be implemented in various modes different from the above-described embodiments without departing from the gist thereof.

  Moreover, although EE type | mold and EI type | mold were demonstrated as an example of an iron core shape, it cannot be overemphasized that it can apply also to the iron core of another shape.

10, 210 iron core,
20 windings,
30 Insulating bobbin,
32 cylinder part,
40 Electrical insulating sheet,
G gap part,
100, 200 Reactor device.

Examples of the insulator 40 include an electrically insulating sheet made of a synthetic resin such as polyester or aramid fiber, but are not limited to the illustrated electrically insulating sheet.

Even in the second embodiment, the winding 20 is wound at a spatial distance from the iron core 210 having the gap portion G. That is, in the reactor device 200 of the present embodiment, the insulator 40 is provided so as to face each gap portion G of the EI type iron core 210 to ensure a spatial distance. The winding 20 is wound in a slot other than the insulator 40.

Claims (5)

An iron core having a gap portion, and a winding having an insulating film disposed around the iron core including the gap portion,
The reactor is characterized in that the winding is wound at a spatial distance from the iron core having the gap portion.   The reactor device according to claim 1, wherein the means for separating a spatial distance from the iron core having the gap portion is an insulator for ensuring a creeping distance from the iron core.   The reactor according to claim 2, wherein the insulator is an electrically insulating sheet made of synthetic resin.   The reactor according to claim 1, wherein the winding is wound around the cylindrical body portion of the insulating bobbin via an electrical insulating sheet.   The reactor according to claim 1, wherein the winding is wound around an insulating bobbin having a thick cylindrical portion.