JPH02234406A - Resin-mold type inductor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resin molded induction electric appliance used in an atmosphere where seawater is splashed, such as in a power transformer of a refrigerated container for marine transportation.

[Conventional technology]

Refrigerated shipping containers for marine transportation have a wide range of temperatures for electrical appliances, as their shipping routes span a wide range from the tropics to the cold, and they are installed on decks where they are exposed to seawater spray, and they are also subject to acceleration due to ship body motion and wave impact. They are exposed to harsh environments unimaginable on land, such as repeated exposure to Therefore, the power transformer is entirely resin-molded to prevent salt water from penetrating into the main body, and to be strong enough to withstand thermal cycles and mechanical shock.

FIG. 2 is a partially fragmented sectional view showing an example of a conventional device.
The main body of the transformer consists of an iron core 2 covered with a rubber-elastic buffer coating 1, a winding 3 wound around the core, a lead wire (not shown) drawn out from the winding 3, and the like. It is integrally cast into a thick resin mold layer 4 such as epoxy resin containing. In addition, the above-mentioned supporting method for fixing the resin molded transformer to a container or a ship hull uses a tightening band 6 that surrounds the resin molded layer 4 via the anti-vibration rubber 5 to fix the resin molded transformer to the support stand 7. The applicant of the present application has already proposed a structure in which it is fixed to .

As the material for the buffer coating 1, a rubber foam containing many closed cells is used. This plays the role of buffering thermal stress caused by the wide range of temperature changes that the resin molded induction electric appliance is subjected to. That is, if the iron core 2 is not covered with the buffer coating 1, the iron core 2 and the resin mold layer 4 will stick together, and thermal stress will occur due to the difference in thermal expansion due to temperature changes.

The coefficient of linear expansion of the silicon steel plate, which is the material of the iron core 2, is approximately IXIO' (1/℃), and that of the epoxy resin containing filler, which is the material of the resin mold layer 4, is approximately 4X10-' (1/℃).
'C), and the latter is several times larger. therefore,
For example, when the entire resin molded induction electric appliance gets cold,
Since the shrinkage of the resin mold layer 4 is larger, the iron core 2 is pressed down by the resin mold layer 4 and thermal stress is generated. Thermal stress can be broadly classified into hoop stress, which binds the core 2 in the lamination direction, and stress caused by a difference in thermal expansion in the direction along the magnetic path of the core 2. In order to prevent the resin mold layer 4 from being mechanically damaged by these stresses, a buffer coating 1 is interposed between the iron core 2 and the resin mold layer 4 to absorb thermal stress.

[Problem to be solved by the invention]

The cushioning sheath 1 constructed in the conventional device is made of a foam having a large amount of elastic deformation, and therefore contains many closed cells. Therefore, although it is effective as a stress buffer, it has the disadvantage that it also acts as a heat insulator because it has poor thermal conductivity. In other words, the heat generated by the iron core 2 due to iron loss etc. is difficult to dissipate to the resin mold layer 4 side, and the temperature of the iron core 2 itself rises, which in turn causes the temperature of the entire resin molded induction electric appliance to rise abnormally due to heat accumulation. occurs. Methods to avoid this problem include suppressing the temperature rise by increasing the cross-sectional area of the iron core 2 to widen the heat transfer area, and using a heat-resistant resin that can withstand higher temperatures as the material for the resin mold layer 4. This has the drawback of increasing the size of the resin-molded induction electric appliance.

An object of the present invention is to improve heat dissipation of the core by eliminating the buffer coating, and to avoid damage to the resin mold layer due to thermal stress caused thereby.

[Means to solve the problem]

In order to solve the above-mentioned problem K-''P. A reinforcing NI consisting of a magnetically permeable rubber sheet containing magnetic powder that is divided into a plurality of parts in a plurality of directions and interposed in each of the divided surfaces, and the glass fiber tape that is previously fixed to the release layer side including the magnetically permeable rubber sheet and a mold resin. A sliding surface is formed between the reinforcing layer and the iron core made of the mold release agent ψ layer.

[Effect]

In the above means, the reinforcing layer is made of a glass fiber tape layer wrapped so as to cover the entire surface of the iron core, and the reinforcing layer is configured so that the resin penetrates into the glass fibers during vacuum casting. Its thermal conductivity is now comparable to that of the resin molded layer, and the heat dissipation from the iron core is much improved compared to that of conventional equipment.The reinforcing layer has the same material composition as so-called FRP, so it itself is extremely Because it has strong mechanical strength, it can withstand stress generated in the lamination direction of the iron core.

In addition, in this invention, the core is divided into multiple parts in the direction of the magnetic path, and a magnetically permeable rubber sheet containing magnetic powder is interposed on each of the divided faces, and a sliding surface made of a mold release agent is formed between the core and the reinforcing layer. Because of this structure, it is possible to absorb the stress generated in the direction along the magnetic path due to the difference in thermal expansion between the core and the reinforcing layer, and the magnetic resistance of the core divided portion is reduced due to the magnetic permeability of the magnetically permeable rubber sheet. It can also be kept small.

〔Example〕

FIG. 1 is a partially broken sectional view of a resin molded induction electric appliance showing an embodiment of the present invention. In the figure, the iron core 2 includes divided iron cores 8A and 8B, etc., which are made by winding silicon steel into a rectangular ring shape and dividing the core in the magnetic path direction so that the height and width are each halved. It is composed of magnetically permeable sheets 9 such as 9A and 9B interposed on each surface. A sliding surface 10 is provided on the surface of the iron core 2, and the entire outside thereof is covered with a glass fiber tape layer 11A, on which the winding 3 is wound. The iron core 2 covered with the glass fiber tape layer 11A and the winding wire 3 wound around it are integrally molded in a resin mold layer 4 containing a filler to form a resin mold type induction electric appliance. A reinforcing layer 11 mechanically reinforced by the glass fiber tape layer 11A is formed at the interface between the layer 4 and the iron core 2, and a sliding surface 10 is formed at the interface with the iron core 2. The obtained resin molded induction electric appliance is fixed to a support base 7 using a tightening band 6 that surrounds the resin mold layer 4 via a vibration isolating rubber 5.

The material of the magnetically permeable sheet 9 is, for example, cobalt (
It is made of iron (Fe) based on CO), silicon (8i), and money powder formed into a sheet shape using a rubber-based binder. As an amorphous alloy powder, for example, a powder containing 73% by weight of Co-1-Fe and 27% by weight of 8i1-B components and a powder particle size of 20 to 50 μm can be mixed into silicone rubber by 70 to 50 μm. When 90% by weight is added and molded into a sheet, a magnetically permeable sheet having a high relative magnetic permeability of about 200 and rubber elasticity with high electrical resistance can be obtained.

As the mold release material forming the sliding surface 10, a material such as silicone grease that does not solidify at the molding temperature or operating temperature of the resin-molded induction electric appliance is used, for example. In addition, the reinforcing layer 11 has a glass fiber tape layer 11A as a base material,
The material has a resin mold/ia4A infiltrated into the gaps between the fibers. As the material for the resin mold layers 4 and 4A, an epoxy resin containing a filler is used.

To manufacture the embodiment device configured as described above, first, the wound core is divided into four parts, and each part is divided into two divided cores 8A'j.
6 and 8B. For these, a mold release agent is applied to the outer surface other than the dividing surface to form a sliding surface 10. Split cores 8A and 8B are abutted against each other with a magnetically permeable sheath 9A interposed between the split surfaces, and the glass fiber tape layer 11A, which is the base material of the reinforcing layer 11, is wrapped around the outside of the split cores 8A and 8B while tightening. is fixed, and winding Φ3 is further wound on the outside thereof. Two pairs of these were made, and they were butted against the core dividing surfaces ζ at both ends with a magnetically permeable sheet 9B interposed between them.
These two pairs are fixed while being tightened with a glass fiber tape layer 11A serving as a base material of the reinforcing layer 11. The iron core 2 and the winding 3 wound around it are integrally molded with resin containing filler. At this time, the integral molding is carried out in a vacuum so that the resin can sufficiently penetrate into the gaps between the glass fiber layers 11A.

In the example device manufactured as described above, the iron core 2C
The thermal conductivity of the rolled reinforcing layer 1l is comparable to that of the resin mold layer 4 because it is sufficiently impregnated with resin. Therefore, heat dissipation from the iron core 2 is improved, and the temperature rise of the entire resin-molded induction electric appliance can be suppressed to a lower level than that of the conventional one.

In order to cope with the stress generated in the direction along the magnetic path of the iron core 2, the wound iron is divided into 6 pieces into 4 pieces, and a magnetically permeable sheet 9 having rubber elasticity is interposed on the divided surface. Since the sliding surface 10 is formed between the iron core 2 and the reinforcing layer 11, thermal stress can be absorbed even if a temperature change occurs.

Since the reinforcing layer 11 is made of a mechanically strong material such as FRP, it can withstand stress that occurs in the stacking direction of the iron core 2.

Regarding the influence on the magnetic circuit caused by dividing the iron core 2, the magnetic resistance of the divided portions can be kept small because the Siemeo magnetic permeability of the magnetic permeability to which amorphous alloy powder is added is as high as about 200. In addition, since amorphous alloys have high electrical resistance, magnetically permeable sheets 9A and 9
The eddy current in section B is also small.

〔Effect of the invention〕

As mentioned above, the present invention provides a resin molded induction electric appliance I
The core is divided into multiple parts in the direction of the magnetic path, a magnetically permeable rubber sheet containing magnetic powder is interposed on each of the divided surfaces, and glass is wrapped to cover the entire surface of the core including the magnetically permeable rubber sheet. It is equipped with a reinforcing layer made of a fiber tape layer and fixed to the resin mold layer side by penetration of mold resin, and a slipping surface between the iron core and the reinforcing layer is created by a release agent layer applied in advance on the surface of the iron core. The configuration was as follows.

As a result, the reinforcing layer has excellent thermal conductivity and mechanical strength, improves the heat dissipation of the core, and prevents damage to the resin mold layer due to stress. It functions to reduce the thermal stress in the direction of the magnetic path, which eliminates the problem of conventional equipment in which heat dissipation from the core is inhibited by the buffer layer containing many closed cells, and keeps the temperature rise lower than in conventional equipment. Now I can do it. At the same time, it is possible to provide a resin-molded induction electric appliance that can withstand a wide range of temperature changes and the thermal stress caused thereby.

In addition, due to the reduction in temperature rise, the cross-sectional area of the iron core can be made smaller than conventional equipment, which also helps to reduce the dimensions and load weight, which are important requirements for marine transport refrigerated containers. I can fully respond.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a partially exploded sectional view showing a resin mold type induction electric appliance according to an embodiment of the present invention, and Fig. 2 is a partially exploded sectional view showing a conventional resin mold type induction electric appliance. . 2... Iron core, 3... Winding wire, 4, 4A... Resin mold layer, 5... Anti-vibration rubber, 6... Tightening band, 7...
...Support stand, 8,8A,8B...Split core, 9,9A
, 9B... Magnetically permeable comb sheet, 10... Sliding surface, 1
1... Reinforcement layer, 11A Fig. 1 Fig. 2

Claims (1)

[Claims] 1) An iron core and a winding wound around it are integrally molded in a resin mold layer containing a filler, and the iron core is divided into multiple parts in the magnetic path direction, and magnetic powder is interposed in each of the divided surfaces. and a glass fiber tape layer wrapped so as to cover the entire surface of the core, which includes the magnetically permeable rubber sheet and is coated with a mold release agent in advance, and the core is fixed to the resin mold layer side. 1. A resin molded induction electric appliance comprising a reinforcing layer made of a glass fiber tape and a molding resin, and a sliding surface formed between the reinforcing layer and an iron core made of the mold release agent layer.