JP2012151374A - Resin mold coil, and mold transformer using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin mold coil having enhanced crack resistance against a crack occurring when the amount of resin shrinkage increases in a resin layer due to curing of resin or operation of a transformer and exceeds an allowable stress, and to provide a mold transformer exhibiting excellent dielectric strength and productivity.SOLUTION: In the configuration of a resin mold coil, the amount of resin shrinkage of each layer on the inner periphery and the outer periphery in the radial direction of the concentric circle of a winding 1 becoming a coil is relaxed by subdivision resulting from multilayering of prepreg layers 41, 42, 43, 44 and a plurality of layers 31, 32, 33, 34 of fibrous glass base material, thereby enhancing the crack resistance.

Description

  The present invention relates to a technique for providing a molded transformer for power reception and distribution.

  As background art in this technical field, there are JP-A-2000-12343 (Patent Document 1) and JP-A-11-214237 (Patent Document 2).

  In Patent Document 1 and Patent Document 2, there is a description that a resin mold layer is formed by a method that is simpler than that of the prior art, and a method for producing a resin mold coil with good insulation characteristics is provided.

  In addition, a resin-molded coil in which a winding obtained by winding a conductor coated with an electrical insulator is molded with a thermosetting resin composition such as an epoxy resin is superior in insulation performance and flame retardancy. It is applied to the high voltage power distribution mold transformer.

  In a conventional resin mold coil manufacturing method, the inner and outer peripheral configurations in the concentric radial direction of the coil are provided with only a resin layer, or only a layer in which a fibrous glass base material is impregnated with a resin and each layer of the resin layer. In some configurations, as described above, the insulation characteristics are considered.

  It should be noted that it is desirable that the resin-molded coil be further improved not only in the insulation characteristics but also in crack resistance.

JP 2000-12343 A JP-A-11-214237

  In the structure of the conventional resin mold coil, it is expected that the amount of resin shrinkage increases in the resin layer when the resin is cured or when the transformer is operated, and cracks occur when the allowable stress is exceeded.

  For example, if a crack occurs, moisture, dust, etc. may enter the coil and winding from the crack, which may cause dielectric breakdown. I can say that.

  The objective of this invention is providing the resin molded coil which solved said problem, and the mold transformer using the same.

  The present application includes a plurality of means for solving the above-mentioned problems, and an example is given below.

  In the resin molded coil configuration, the resin shrinkage amount of each layer is reduced by subdivision by prepreg layer, multiple layers of fibrous glass substrate, and multiple layers of fibrous glass substrate, with respect to the inner and outer peripheral resin layers in the concentric radial direction of the coil and winding. Relieve and improve crack resistance.

  Furthermore, below, the structure of this invention is demonstrated with another expression.

  In a resin molded coil having resin layers on the inner peripheral side and outer peripheral side in the radial direction of the winding, the inner peripheral side resin layer or the outer peripheral side resin layer has a plurality of glass substrates.

  In the resin molded coil, the resin layer on the inner peripheral side is provided with a prepreg layer on the inner peripheral side, and a glass substrate layer is provided on the outer peripheral side of the prepreg layer.

  In the resin mold coil, from the inner peripheral side in the radial direction of the winding toward the outer peripheral side, a first prepreg layer, a first glass base layer, a second prepreg layer, a second glass base layer, a winding, A third glass substrate layer, a third prepreg layer, a fourth glass substrate layer, and a fourth prepreg layer are provided.

  In the resin mold coil, resin layers are provided on the upper side and the lower side in the axial direction of the winding of the glass base material layer.

  In the resin mold coil, the glass base material is made fibrous.

  In the resin molded coil, the resin layers provided on the upper side and the lower side have a fibrous glass substrate.

  The resin molded coil, the iron core on which the resin molded coil is provided, the connection terminal to which the resin molded coil is connected, and the metal fitting to which the resin molded coil is fastened, constitute a power receiving and distributing mold transformer To do.

  By implementing this invention, compared with the past, the crack resistance of a resin layer and winding workability | operativity can be improved, and the molded transformer excellent in dielectric strength and productivity can be provided.

1 is an example of a cross-sectional view of a resin molded coil of Example 1. FIG. It is an example of sectional drawing of the resin mold coil of Example 2. FIG. It is an example of sectional drawing at the time of seeing the resin mold coil of the example of the present invention from the top. It is a general-view figure of the resin mold transformer provided with the mold coil of the present invention.

  Embodiments will be described below with reference to the drawings.

  In the present embodiment, the configuration of the resin layer on the inner peripheral side and the outer peripheral side in the radial direction when the winding of the molded coil is wound will be described.

  FIG. 1 is an example of a cross-sectional view when the resin molded coil of the present embodiment is viewed from the side.

  The resin-molded coil of the present embodiment has a winding 1 that becomes a coil, a mold resin layer 2, a glass substrate layer, and a prepreg layer.

  The first prepreg layer 41, the first glass base layer 31, the second prepreg layer 42, the second glass base layer 32, the winding 1, and the third glass base layer 33 from the coil inner peripheral side toward the outer peripheral side. The third prepreg layer 43, the fourth glass substrate layer 34, and the fourth prepreg layer 44 are arranged.

  The mold resin layer 2 is made of resin containing a first prepreg layer 41, a first glass substrate layer 31, a second prepreg layer 42, a second glass substrate layer 32, a winding 1, a third glass substrate layer 33, a third The prepreg layer 43, the fourth glass substrate layer 34, the fourth prepreg layer 44, and the like are formed by filling and curing a resin or the like up and down.

  The conventional resin-molded coil structure requires the prepreg tape to be wound several times in order to ensure the thickness of the prepreg layer provided on the inner circumference side from the viewpoint of crack resistance. There was a problem of getting worse.

  On the other hand, in the resin mold coil of FIG. 1 of Example 1, in the configuration of the resin layer, the prepreg layer provided on the inner peripheral side is wound once with the prepreg tape to form the first prepreg layer 41.

  A first glass substrate layer 31 is provided from above the first prepreg layer 41.

  By providing this first glass substrate layer 31, crack resistance is obtained.

  As described above, since the first prepreg layer 41 on the inner circumferential side is wound once by the prepreg tape, the winding work time is reduced and the production time is less than when the prepreg tape is wound a plurality of times as in the conventional case. Therefore, the performance will be improved as compared with the conventional case.

  In addition, as illustrated in FIG. 1, it is possible to improve crack resistance by providing a plurality of layers such as the second prepreg layer 42 that is wound once by the prepreg tape and the second glass substrate layer 32. Is possible. Even in this case, since the number of windings of the prepreg tape is smaller than in the conventional case, a resin mold coil with improved winding workability can be obtained.

  The mold resin layer 2 includes a winding 1, a prepreg layer having a first prepreg layer 41, a second prepreg layer 42, a third prepreg layer 43, and a fourth prepreg layer 44, and a first glass substrate layer The glass substrate layer having the first glass substrate layer 31, the third glass substrate layer 33, the third glass substrate layer 34, and the fourth glass substrate layer 34 is filled with a resin and cured.

  In the above description, the number of windings of the prepreg tape is not limited to one winding, and is not particularly limited as long as the winding work time can be reduced as compared with the conventional winding. Therefore, it may be twice or three times.

  In this embodiment, the structure of the upper and lower resin layers of the resin molded coil will be described.

  FIG. 2 is an example of a cross-sectional view of a resin molded coil in the second embodiment.

  In the cross-sectional view of the resin-molded coil in FIG. 2, the description of the components having the same functions as those shown in FIG.

  In Example 2, the mold resin layer 2 is devised.

  As illustrated in FIG. 2, a fibrous glass substrate 5 is disposed on the mold resin layer 2 at the end surface portion of an insulator such as a glass substrate layer and a prepreg layer, and the glass substrate layer and the prepreg layer are arranged. It covers the end surface of the insulator.

  By doing in this way, the crack from these insulator end surface parts is prevented. The mold resin layer 2 is formed by filling and curing the resin on the upper and lower sides of the glass base layer and the prepreg layer.

  In addition to the glass substrate layer and the prepreg layer, an insulating film such as an interlayer insulating film such as Teonex (R) or Lumirror X10S (R) or a glass cloth may be provided.

  FIG. 3 illustrates a case where the resin layer of the resin mold coil illustrated in FIGS. 1 and 2 is formed using a resin.

  As shown in FIG. 3, the first prepreg layer 41, the first glass base layer 31, the second prepreg layer 42, and the second glass base layer 32 on the inner peripheral side of the resin mold coil are made of resin, and the resin layer 40 </ b> A and The third glass base material layer 33, the third prepreg layer 43, the fourth glass base material layer 34, and the fourth prepreg layer 44 on the outer peripheral side are made into a resin layer 40B by the resin.

  As described above, as illustrated in FIG. 3, in the resin mold coil, the resin layer that is a resin layer has the resin layer 40 </ b> A located on the inner peripheral side of the winding 1 and the resin layer 40 </ b> B located outside. Become.

  Next, FIG. 4 shows a perspective view of an overview of a power receiving / distribution mold transformer provided with the resin mold coil 100.

  The power receiving / distribution molded transformer shown in FIG. 4 includes an iron core 10, a primary coil arranged around the iron core 10 to generate an alternating magnetic field, a secondary coil arranged between the iron core 10 and the primary coil, and a primary coil. A primary terminal 13 drawn out of the transformer as a connection terminal, a secondary terminal 14 drawn out of the transformer as a connection terminal of a secondary coil, and transformer fittings 11 and 12 etc. .

  Between the primary coil and the secondary coil, an air layer is used for both insulation and cooling. The metal fittings 11 and 12 are composed of an upper metal fitting and a lower metal fitting that fasten and support the iron core 10 and the coil from above and below.

  Further, the primary coil may be formed of a split coil, and a resin mold coil is formed by casting and curing a resin. The secondary coil does not use the above-described winding method of the split coil, and may be mounted with a mold coil in which the mold is removed by winding the coil around a mold and casting and curing resin.

  Further, the bobbin is made of resin and uses a glass roving cloth base material.

DESCRIPTION OF SYMBOLS 1 ... Winding 2 ... Mold resin layer 3 ... Glass base material layer 5 ... Fiber glass base material 10 ... Iron core 11, 12 ... Transformer metal fitting 13 ... Primary terminal 14 ... Secondary terminal 31 ... 1st glass base material Layer 32 ... second glass substrate layer 33 ... third glass substrate layer 34 ... glass substrate layer 41 ... first prepreg layer 42 ... second prepreg layer 43 ... third prepreg layer 44 ... fourth prepreg layer 100 ... resin Molded coil

Claims (7)

In a resin molded coil having a resin layer on the inner and outer peripheral sides in the radial direction of the winding
The resin mold coil, wherein the inner peripheral resin layer or the outer peripheral resin layer has a plurality of glass substrates. In the resin mold coil according to claim 1,
The inner peripheral resin layer is
A resin-molded coil, wherein a prepreg layer is provided on an inner peripheral side, and a glass substrate layer is provided on an outer peripheral side of the prepreg layer. In the resin mold coil according to claim 1,
The first prepreg layer, the first glass substrate layer, the second prepreg layer, the second glass substrate layer, the winding, the third, from the inner peripheral side to the outer peripheral side in the radial direction of the winding A resin-molded coil comprising: a glass substrate layer, a third prepreg layer, a fourth glass substrate layer, and a fourth prepreg layer. In the resin mold coil according to claim 1 to claim 3,
A resin mold coil, wherein a resin layer is provided on the upper side and the lower side in the axial direction of the winding of the glass substrate layer. In the resin mold coil according to claim 1 to claim 4,
The resin-molded coil, wherein the glass substrate is fibrous. In the resin mold coil according to claim 5,
The resin mold coil, wherein the resin layer provided on the upper side and the lower side has a fibrous glass substrate. The resin molded coil according to claim 1, and
An iron core provided with the resin mold coil;
A connection terminal to which the resin molded coil is connected;
A power receiving / distribution mold transformer, comprising: a metal fitting to which the resin mold coil is fastened.

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