Core for stationary induction apparatus

Abstract

The invention provides a core for a stationary induction apparatus including an amorphous core formed of an amorphous thin magnetic strip arranged inside the core, a silicon steel sheet core formed of a silicon steel sheet arranged on a side surface of the amorphous core, a wear plate arranged on the outermost peripheral surface of the silicon steel sheet core, an amorphous core frame arranged around the amorphous core including a space between the amorphous core and the silicon steel sheet core, and a support frame which supports and fixes the amorphous core and the silicon steel sheet core via the wear plate.

Claims

1. A core for a stationary induction apparatus comprising: an amorphous core with a rectangular cross section formed of an amorphous thin magnetic strip arranged inside the core, a silicon steel sheet core formed of a silicon steel sheet arranged so as to face only a pair of opposite side surfaces of the amorphous core with the rectangular cross section, a wear plate arranged on the outermost peripheral surface of the silicon steel sheet core, an amorphous core frame arranged around the amorphous core including a space between the amorphous core and the silicon steel sheet core, and a support frame which supports and fixes the amorphous core and the silicon steel sheet core via the wear plate, wherein the amorphous core is an amorphous wound core in which an amorphous thin magnetic strip is wound in a roughly rectangular shape, a minimum unit of the amorphous wound core being formed by dividing the amorphous magnetic strip into a plurality of bundles and arranging them vertically and horizontally when the amorphous core is horizontally cross-sectioned and viewed from a plan view, the silicon steel sheet core is a silicon steel-stacked block core formed by stacking the silicon steel sheets and forming a step-lap joint structure at a corner, and the amorphous core frame is made of iron and has openings at the top and bottom through which the amorphous core passes, and an insulator is interposed between the amorphous core frame made of iron and the amorphous core.

2. The core for a stationary induction apparatus according to claim 1, wherein the silicon steel-stacked block core is configured such that a width decreases sequentially from the amorphous core side toward the wear plate side.

3. The core for a stationary induction apparatus according to claim 1, wherein the support frame is arranged in a transverse direction on an upper portion and a lower portion of an outer peripheral surface of the wear plate, and the support frame arranged in the transverse direction supports and fixes the amorphous core and the silicon steel sheet core via the wear plate.

4. The core for a stationary induction apparatus according to claim 3, wherein the support frame arranged in a transverse direction on an upper portion and a lower portion of the outer peripheral surface of the wear plate is connected by a second support frame arranged between the upper and the lower sides of the support frame.

5. The core for a stationary induction apparatus according to claim 1, wherein the support frame is made of a nonmagnetic material or a magnetic material, and when the support frame is made of a magnetic material, a nonmagnetic material is interposed in a part of the magnetic material.

6. The core of a stationary induction apparatus according to claim 1, wherein the wear plate is a quadrangle where a portion equivalent to a window of the core is cut out corresponding to the shape of the silicon steel sheet core.

7. The core for a stationary induction apparatus according to claim 1, wherein the wear plate is integrally formed or divided into a plurality of parts.

8. The core for a stationary induction apparatus according to claim 1, wherein the wear plate is made of iron or a nonmagnetic material, and when the wear plate is made of iron, a slit is provided in the wear plate.

9. The core for a stationary induction apparatus according to claim 1, wherein the amorphous core frame is made of a nonmagnetic material or a magnetic material, and when the amorphous core frame is made of a magnetic material, a nonmagnetic material is interposed in a part of the magnetic material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of Example 1 of a core for a stationary induction apparatus of the invention.

(2) FIG. 2 is a perspective view of the core for a stationary induction apparatus of Example 1 of FIG. 1 taken along a line A-A′.

(3) FIG. 3 is a diagram of a minimum unit of the core constituting Example 1 of the core for a stationary induction apparatus of FIG. 1.

(4) FIG. 4 is a perspective view of Example 2 of a core for a stationary induction apparatus of the invention.

(5) FIG. 5 is a perspective view of Example 3 of a core for a stationary induction apparatus of the invention.

(6) FIG. 6 is a perspective view of the core for a stationary induction apparatus of Example 3 of FIG. 5 taken along a line A-A′.

DETAILED DESCRIPTION OF THE INVENTION

(7) Hereinafter, the core for a stationary induction apparatus of the invention will be described based on the illustrated examples. In each example, the same reference signs are used for the same components.

Example 1

(8) FIG. 1 and FIG. 2 show Example 1 of a core fora stationary induction apparatus of the invention.

(9) As shown in the figures, the core for a stationary induction apparatus of the present example schematically includes an amorphous core 1 formed of an amorphous thin magnetic strip arranged inside the core, a silicon steel sheet core 2 formed of a silicon steel sheet arranged on both sides (both side surfaces) of the amorphous core 1, a wear plate 3 arranged on the outermost peripheral surface of the silicon steel sheet core 2, an amorphous core frame 4 arranged around the amorphous core 1 including a space between the amorphous core 1 and the silicon steel sheet core 2, and a support frame 5 which supports and fixes the amorphous core 1 and the silicon steel sheet core 2 via the wear plate 3 by clamping them with a clamping jig (for example, a bolt) 6.

(10) The support frame 5 is arranged in a transverse direction on an upper portion and a lower portion of an outer peripheral surface of the wear plate 3, and the support frame 5 arranged in the transverse direction on an upper portion and a lower portion supports and fixes the amorphous core 1 and the silicon steel sheet core 2 via the wear plate 3 by clamping them with the clamping jig 6. In addition, the support frame 5 arranged in the transverse direction on an upper portion and a lower portion of the outer peripheral surface of the wear plate 3 is connected by a second support frame 7 arranged between the upper and the lower sides of the support frame 5.

(11) The amorphous core 1, which is a constituent element of FIG. 1 and FIG. 2, is an amorphous wound core in which an amorphous thin magnetic strip is wound in a roughly rectangular shape. However, it can also be an amorphous laminated core formed by laminating an elongated amorphous thin magnetic strip and then butting both ends to form a roughly rectangular shape. The silicon steel sheet core 2 is a silicon steel-stacked block core formed by laminating a plurality of silicon steel sheets and forming a step-lap joint structure at a corner. However, it can also be a silicon steel sheet wound core formed by winding a silicon steel sheet into a roughly rectangular shape.

(12) Since the amorphous core frame 4 is configured to surround a magnetic limb of the amorphous core 1, it is desirable that it is made of a nonmagnetic material such as SUS, Al, wood and a resin, or it is desirable to have a configuration in which a nonmagnetic material such as a resin is interposed in a part of a magnetic material such that the magnetic limb is not surrounded by the magnetic material in a circle. When a material such as iron is used for the amorphous core frame 4, it is desirable that an insulator such as a press board is interposed between the amorphous core 1 and the amorphous core frame 4 such that the amorphous core 1 and the amorphous core frame 4 do not come into direct contact.

(13) The wear plate 3 is a quadrangle where a portion equivalent to a window 8 of the core is cut out corresponding to the shape of the silicon steel sheet core 2, and it can be integrally formed or divided into a plurality of parts. As the material, the wear plate 3 may be made of iron, and it may also be made of a nonmagnetic material such as SUS, Al, wood and a resin. When the wear plate 3 is made of iron, an eddy current loss due to interlinkage flux is reduced by inserting a slit in the wear plate 3, and thus heat generation of the wear plate 3 can be prevented.

(14) Since the support frame 5 is configured to surround the core, it is desirable that it is made of a nonmagnetic material such as SUS, Al, wood and a resin, or it is desirable to have a configuration in which a nonmagnetic material such as a resin is interposed in a part of a magnetic material such that the magnetic limb is not surrounded by the magnetic material in a circle.

(15) Generally the amorphous thin magnetic strip is as thin as tens of μm in thickness of one sheet. Since hundreds of sheets are laminated, self-standing is difficult. In contrast, since the silicon steel sheet is about 10 times as thick as the amorphous thin magnetic strip, self-standing is possible. Therefore, it is possible to suppress shape deformation of the amorphous core 1 by arranging the silicon steel sheet core 2 on the outer periphery of the amorphous core 1 and further clamping and fixing the amorphous core 1 and the silicon steel sheet core 2 using the wear plate 3. By clamping and fixing using the wear plate 3, it is not only possible to clamp the amorphous core 1 and the silicon steel sheet core 2 evenly but also possible to protect the amorphous core 1 and the silicon steel sheet core 2 because no clamping force is directly applied to the amorphous core 1 and the silicon steel sheet core 2.

(16) Moreover, the amorphous core 1 is sensitive to stress, and thus iron loss increases when a clamping pressure is directly applied. In particular, it is necessary to support the core with a support frame in a large core; however, in the configuration of the example, it is not necessary to directly press the amorphous core 1, and thus deterioration of iron loss can be prevented.

(17) The rigidity of the core can be further strengthened by using a piece of an integral wear plate 3 which is not divided.

(18) FIG. 3 shows a minimum unit (the left half of FIG. 1) of a core for a stationary induction apparatus including the amorphous core 1 and the silicon steel sheet core 2 shown in FIG. 1 and FIG. 2.

(19) As shown in FIG. 3, by separately producing the core for a stationary induction apparatus in minimum units and assembling, it is possible to constitute a transformer using the same core no matter it is single-phase or three-phase, and thus productivity can be improved.

(20) According to the configuration of the example as described above, a core for a stationary induction apparatus having a high mechanical strength and a low magnetic loss can be obtained even when the core using an amorphous thin magnetic strip and a silicon steel sheet is increased in size.

Example 2

(21) FIG. 4 shows Example 2 of a core for a stationary induction apparatus of the invention.

(22) The core for a stationary induction apparatus of the example shown in the figure is one in which the shape of the wear plate 3 arranged between the silicon steel sheet core 2 and the support frame 5 is modified in the configuration described in Example 1.

(23) That is, as shown in FIG. 4, the wear plate 3 is divided into a plurality of pieces (8 in this example) in the example, and by using the divided wear plate 3, operation at the time of assembly becomes easy because the size of the wear plate 3 per piece can be reduced.

(24) The wear plate 3 may be made of iron, and it may also be made of a nonmagnetic material such as SUS, Al, wood and a resin. When the wear plate 3 is made of iron, an eddy current loss due to interlinkage flux is reduced by inserting a slit in the wear plate 3, and thus heat generation of the wear plate 3 can be prevented.

(25) Since the support frame 5 is configured to surround the core, it is desirable that it is made of a nonmagnetic material such as SUS, Al, wood and a resin, or it is desirable to have a configuration in which a nonmagnetic material such as a resin is interposed in a part of a magnetic material such that a magnetic limb is not surrounded by the magnetic material in a circle.

(26) It is possible to obtain the same effect as in Example 1 even with such a configuration of the example.

Example 3

(27) FIG. 5 and FIG. 6 show Example 3 of a core for a stationary induction apparatus of the invention.

(28) The core for a stationary induction apparatus of the example shown in the figures is one in which silicon steel sheets are stacked and the width of the silicon steel-stacked block core 2 where a step-lap joint structure is formed at a corner is modified in the configuration described in Example 1.

(29) That is, the silicon steel-stacked block core 2 is configured such that the width decreases sequentially from the amorphous core 1 side toward the wear plate 3 side.

(30) By the configuration of the example, it is not only possible to obtain the same effect as in Example 1, but also possible to make the cross section of the core into an approximately circular shape, to arrange the core in a circular winding without waste and to increase winding space factor of the core.

(31) In addition, it may also be configured that only the yoke part of the silicon steel sheet core 2 is a plate of the same width and the core yoke part is clamped by the support frame 5, so that the core can be clamped without decreasing the clamping area.

(32) The above examples have been described in detail in order to explain the invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. In addition, it is possible to replace a portion of the configuration of certain example with the configuration of another example and the configuration of another example can be added to the configuration of certain example. In addition, it is possible to add, delete, and replace other configurations with respect to a portion of the configuration of each example.