JP2011142149A - Transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-loss, large-capacity transformer by increasing mechanical strength of an amorphous transformer limited to a small-sized model. <P>SOLUTION: An iron core leg 2 is constituted by stacking, in a magnetization direction, a plurality of toroidal core units 3 made by winding amorphous metals and the cross-section of a coil 8 wound around the iron core leg 2 is made to have a circular shape. The coil 8 has larger mechanical strength when the cross-section of the coil 8 is made to have the circular shape, and a large-capacity model can be manufactured to achieve the low-loss and large-capacity transformer. The core units 3, formed by winding thin-belt plate shaped amorphous metals, can have higher center stability when stacked by winding the amorphous metals shifted along widths of belt plates thereof. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a transformer, and more particularly to an amorphous transformer having low loss characteristics.

  In recent years, amorphous transformers using amorphous metal in the iron core have become widespread. Since the amorphous material is a thin ribbon, the amorphous transformer is put into practical use only as a transformer of a type using a wound core structure formed by stacking thin ribbon amorphous materials.

  In the transformer, the iron core structure constituted by using the silicon steel plate includes a wound iron core structure and a stacked iron core structure. Since the wound core structure is formed by winding a silicon steel plate having a uniform width dimension, the shape of the coil wound around the iron core has a rectangular cross section. Therefore, in the operation of the transformer, the coil receives an electromagnetic mechanical force acting in the circumferential direction when undergoing deformation such as expansion and contraction. It is difficult to secure.

  On the other hand, a stacked core structure in which silicon steel plates are stacked can have a circular cross section by changing the width of the core material used for the core according to the stacked plates. Since the cross section of the coil surrounding such a core structure can also be circular, the strength of the coil against electromagnetic mechanical force can be ensured.

  In a general transformer, as the capacity increases, the electromagnetic mechanical force at the time of a short circuit increases. For this reason, it is common to adopt a stacked core structure in a large capacity transformer of several thousand KVA or more. If the capacity is less than that, the electromagnetic mechanical force at the time of short circuit is not so large, and the mechanical strength can be ensured even with a rectangular cross section. Therefore, amorphous transformers have been put into practical use.

  There has been proposed a low-cost, high-efficiency, large-capacity reactor device that uses amorphous metal and suppresses deterioration of iron loss due to fringing even with a simple iron core structure (see Patent Document 1). The reactor device includes an iron core that includes a leg portion in which a plurality of ring-shaped core units and spacers are stacked in the magnetization direction, and a yoke portion that sandwiches the core unit from above and below, and a winding wound around the iron core ( Coil). Part or all of the core unit is made of an amorphous metal, and is preferably formed in a toroidal shape in which an amorphous metal is continuously wound.

  A method for manufacturing an amorphous metal core that prevents short-circuiting between adjacent amorphous metal strip pieces that cause chain loss, the method comprising: cutting and non-cutting amorphous metal cores for transformers Is disclosed in which a pair of wedge members are arranged at one edge of the core molding and the strip piece is moved between the layers, thereby making it possible to manufacture a core molding with an inclined edge. (Patent Document 2). Although the process of realigning the edges in the final stroke is included, the strip movement is formed in the material width direction in the interlayer movement process.

JP 2008-218660 A Japanese Patent Laid-Open No. 05-217776

Of the conventional technologies, when reducing the iron loss by using a silicon steel sheet, it is generally considered to design the iron core with a low magnetic flux density, but this method limits the reduction in loss. There is a significant increase in the size and mass of the equipment.
In addition, when an amorphous metal is used for the iron core, the loss can be significantly reduced, but it has a wound core structure, and the capacity that can be used is limited.
From the above, it is difficult to produce a low-loss transformer for large-capacity models.

Therefore, even with a simple iron core structure in which a plurality of ring-shaped core units are stacked or wound using amorphous metal, there is a problem to be solved in terms of further stabilizing the stacked state.
This invention is providing the transformer provided with the iron core stably piled up and down when a ring-shaped core unit was piled up in multiple numbers.

  In order to solve the above problems, the transformer according to the present invention forms an iron core leg by stacking a plurality of ring-shaped core units that are manufactured by winding amorphous metal in the magnetization direction, and the coil cross section is circular. It is a thing.

  If the coil cross-section is circular, the mechanical strength is increased, a large-capacity model can be manufactured, and a low-loss large-capacity transformer can be realized.

  In the present transformer, the core unit around which the amorphous metal is wound can be formed so as to be shifted in the material width direction as the distance from the center increases.

  Moreover, in this transformer, the said core unit which wound the said amorphous metal has reversed the shifting direction in the middle of winding. Adjacent units are separated in the radial direction from the center hole, and in particular, the fitting is restricted by the annular portions before and after the shifting direction is reversed. It is possible to prevent enlarging and thus suppress the height of the core unit.

  According to the transformer according to the present invention, a toroidal core unit using an amorphous metal can be manufactured, and a low-loss, large-capacity transformer can be manufactured at low cost.

It is a perspective view which shows an example of the iron core structure used for the transformer by this invention. It is a perspective view which shows the core unit of the iron core structure shown in FIG. It is a perspective view which shows one Example of the high capacity | capacitance transformer comprised by mounting | wearing with the iron core structure shown in FIG. It is a perspective view which shows another example of the core unit which comprises the iron core structure used for the transformer by this invention. It is sectional drawing of the iron core leg part formed by stacking the core unit shown in FIG. It is a perspective view which shows another example of the core unit which comprises the iron core structure used for the transformer by this invention. It is sectional drawing of the iron core leg part formed by stacking the core unit shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an example of the iron core structure of a transformer according to the present invention. The iron core 1 shown in FIG. 1 includes three leg iron cores 2, 2, 2 formed by stacking a plurality of ring-shaped core units 3 and spacers 4 in the magnetization direction, and yoke parts 5, 5 sandwiching them from above and below. And. The leg iron cores 2, 2, and 2 are composed of three iron cores corresponding to three-phase alternating current (U phase, V phase, W phase).

  The core unit 3 used in the iron core 1 is partially or entirely made of an amorphous metal. As shown in FIG. 2, the core unit 3 is a cylindrical (toroidal) iron core in which a thin ribbon-like amorphous metal is continuously wound. A space 6 through which a stud 7 for tightening the iron core passes is provided at the innermost periphery. Is provided. The spacer 4 is made of an insulator. Each yoke portion 5 is made of a substantially triangular thick plate material formed by laminating amorphous or laminating silicon steel plates.

  Each leg iron core 2 of the iron core 1 is assembled by stacking a plurality of core units 3 thus configured through a stud 7 at the center via a spacer 4. The studs 7 are fastened to the yoke parts 5 and 5 at both ends, and the yoke parts 5 and 5 are drawn through the studs 7, whereby the plurality of stacked core units 3 are fastened between the yoke parts 5 and 5. .

  FIG. 3 is a perspective view showing an embodiment of a large-capacity transformer according to the present invention configured by attaching a coil to the iron core shown in FIG. The coil 8 (primary coil and secondary coil) is configured to be wound around each leg iron core 2. Thus, by incorporating a coil in the circular iron core leg 2, the cross section of each leg iron core 2 becomes circular, and the cross section of the coil 8 can also be circular. The mechanical strength is greatly increased because the coil shape is circular. Since the mechanical strength is increased, it is possible to withstand a large short-circuit current, and the capacity of the amorphous transformer can be increased.

  FIG. 4 is a perspective view showing another example of the core unit constituting the core leg used in the transformer according to the present invention, and FIG. 5 is a view of the core leg formed by stacking a plurality of core units shown in FIG. It is sectional drawing. As shown in FIG. 4, the core unit 13 is formed into a cocoon (bamboo shoot) shape by winding a thin ribbon material to be wound while being shifted little by little in the material width direction from the central portion toward the outer peripheral portion. The core legs 12 are assembled by stacking the core units 13 configured in this way through the studs 7 through the spacers 14 in the center.

  As shown in FIG. 5, the core leg 13 has a cross section in which the core units 13 are stably stacked between the upper and lower sides. In the illustrated example, each core unit 13 has a center portion that is taller than the outer peripheral portion, but may be reversed.

  The surface where each unit 13 faces between the upper and lower sides is a conical surface, and the area is larger than the facing area of each unit 3 in the embodiment shown in FIG. 1 and FIG. Propagation is facilitated, and as a result, the loss as a transformer can be reduced. By using such a core unit, a low-loss, large-capacity amorphous transformer is possible.

  FIG. 6 is a perspective view showing still another example of the core unit constituting the core leg part used in the transformer according to the present invention, and FIG. 7 is an iron core formed by stacking a plurality of core units shown in FIG. It is sectional drawing of a leg part. As shown in FIG. 6, the core unit 23 used for the iron core leg portion 22 is wound in the material width direction as the thin strip material to be wound moves from the center portion toward the outer peripheral portion, and reverses the shifting direction in the middle of the winding. . The cross section of the iron core leg portion 22 has the shape shown in FIG. 7, and the area in contact with each unit 23 increases to facilitate the propagation of magnetic flux. Furthermore, by shifting to the opposite side during winding, the dead space is reduced and the height of the core unit can be suppressed. In addition, by doing so, the fitting state of the adjacent units 23 is regulated by the annular portion that is separated in the radial direction from the center hole portion, so that the fitting state is stabilized at the center and the enlargement of the iron core is prevented, Avoid increasing the size of the transformer. A small-capacity, low-loss, large-capacity amorphous transformer becomes possible.

  According to the present invention, by using the toroidal core unit using amorphous metal, the mechanical strength is high and the stacked state of the core unit is stable while having a simple structure and a large capacity. An amorphous transformer can be provided.

DESCRIPTION OF SYMBOLS 1 Iron core 2,12,22 Iron core leg part 3,13,23 Core unit 4,14 Spacer 5 Yoke part 6,16,26 Space 7 Stud 8 Coil

Claims (3)

  A core part using an amorphous metal is a transformer in which a part or the whole of an iron core having a leg part in which a plurality of ring-shaped core units are stacked or wound is made of amorphous metal. A transformer comprising a toroidal iron core wound with an amorphous metal.   2. The transformer according to claim 1, wherein the core unit around which the amorphous metal is wound is shifted in the material width direction as it is away from the center.   3. The transformer according to claim 2, wherein the core unit wound with the amorphous metal reverses the shifting direction in the middle of winding to suppress the height of the core unit.

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