JP2755645B2 - Winding core type static induction machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a wound iron core stationary induction device made of an amorphous magnetic alloy ribbon.

(Prior Art) In recent years, it has been studied to use an amorphous magnetic alloy thin strip instead of a conventional directional silicon steel strip as a core material for a wound iron core in a static induction device such as a transformer or a reactor.

This amorphous magnetic alloy ribbon is produced by ultra-quenching a molten alloy, and has excellent magnetic properties with extremely small iron loss and exciting current as compared with the silicon steel ribbon. On the other hand, the thickness of the amorphous magnetic alloy ribbon is about 30 μm, which is about 1/10 thinner than the silicon steel ribbon, and its width is narrower for the same reason. For this reason, there is a problem that a wound core formed by winding an amorphous magnetic alloy ribbon has low rigidity. Therefore, a stationary induction device using a wound iron core made of an amorphous magnetic alloy ribbon,
For example, when manufacturing a transformer, in order to improve the workability of the process of mounting the windings on the winding core and assembling the winding core, it is necessary to reinforce the winding core and increase the rigidity thereof.

As a wound iron core structure using an amorphous magnetic alloy ribbon, an uncut wound iron core generally having no rectangular joint is often used. However, in the case of an uncut wound core, the winding must be wound directly around the leg of the wound core, which not only deteriorates the winding operation but also improves the core occupancy in the winding insulating cylinder. It is necessary to use a stepped core whose cross section is close to circular. The production of such a multi-stage iron core has the disadvantage that the production process is complicated and the workability is deteriorated. In addition, since a gear for driving the cylinder is required during the winding operation, the height of the iron core window must be increased, and there are drawbacks such as an increase in the size and weight of the equipment.

Therefore, a joint system having one joint portion for each turn of the iron core has been proposed.

In a core wound using an amorphous magnetic alloy ribbon, when a compressive force is applied in the vertical direction of the core (in the case of a rectangular core, the thickness direction of the ribbon from above and below), the bending stiffness is small and the iron loss characteristics deteriorate. . Therefore, it is necessary to adopt a structure that does not apply a compressive force in the vertical direction of the iron core.

Conventionally, as a clamp structure of a wound core made of an amorphous magnetic alloy ribbon, as shown in FIGS. 7 to 10, an upper yoke portion and a lower portion of a rectangular wound core 2 on which a winding 3 is disposed. Upper clamp 5 and lower clamp 4 forming yoke part from outside
It is covered with. Then, one end of the stud 6 is screwed into a nut 8 attached to the lower clamp 4, the other end is passed through the upper clamp 5, and is tightened with the nut 8 through the washer 7, thereby winding the lower clamp 4 and the upper clamp 5. The iron core 2 is supported and fixed.

Further, as another conventional wound core type transformer, a leg holding portion for holding the legs of the wound core formed by winding an amorphous magnetic alloy ribbon from the side and a winding wound around the legs are used. Reinforcing member that has a winding support part that is supported from below and can be attached to the core, and a yoke support part that supports the upper yoke part of the core from below, and tightens the upper yoke part from both sides. The fastener is configured to be held by a reinforcing member, and the reinforcing member and the iron core fastener increase the rigidity of the wound core made of the amorphous magnetic alloy ribbon to prevent shape loss. There is a wound iron core type transformer configured so that a load is not applied to the wound iron core to prevent a decrease in magnetic characteristics.

(Problems to be Solved by the Invention) However, such a structure for supporting a wound iron core has the following disadvantages (1) to (4).

(1) The lower clamp 4 and the upper clamp 5 are formed integrally with each other over the entire width direction of the wound core 2, and the clamps 4 and 5 do not apply a tightening force in the width direction of the wound core 2.
The lower clamp 4 and the upper clamp 5 are compressed vertically by the studs 6 and the nuts 8, that is, by tightening the yoke of the wound core 2 from above and below, so that a compressive force is applied to the iron core leg and the iron core corner. Since the amorphous magnetic alloy ribbon 1 has a property that the strain sensitivity due to the compressive force is larger than that of the grain oriented silicon steel sheet, the iron loss characteristics are deteriorated when a force is applied in the vertical direction of the iron core. FIG. 10 is a diagram showing a relationship between an upper and lower tightening force applied to the wound core and an iron loss (W / Kg) obtained by an experiment. According to this diagram, it can be seen that when the compressive force (bending stress) applied to the iron core from the vertical direction increases, the iron loss greatly deteriorates.

(2) The width of the amorphous magnetic alloy ribbon is narrow due to the manufacturing process by the super-quenching method, and the width of the single core cannot secure the width of the wound core unless the core has a small capacity. In many cases, a plurality of wound iron cores formed by winding an amorphous magnetic alloy ribbon are combined. FIG. 9 shows a configuration in which two (2a, 2b) lap joint wound iron cores are arranged in the iron core width direction. When this iron core is supported by the iron core supporting structure shown in FIGS. 7 and 8, the lower clamp 4 and the upper clamp 5 are integrally formed with the portions covering both side surfaces of the wound core 2 and fastened to the wound core in the width direction. Since no force is applied, the assembled core 2 cannot be tightened and fixed in the width direction. For this reason, when external force such as mechanical vibration or earthquake generated during transportation of the transformer is applied, the core 2 moves slightly in the width direction, so that the magnetic properties of the core 2 deteriorate, and a part of the end face of the core It may be damaged. In particular, the amorphous magnetic alloy ribbon has a property of becoming brittle when subjected to strain relief annealing, so that it is easily broken, and if it is broken, the quality of the wound iron core is reduced. Further, since the amorphous magnetic alloy ribbon 1 is about 1/10 thinner than the directional silicon steel ribbon, the rigidity of the wound core 2 is low, and the core is easily deformed when the above-mentioned mechanical external force is applied. In particular, in FIG. 7, when an external force acts in the horizontal direction, a bending stress is applied to the iron core leg, and the magnetic characteristics deteriorate.

(3) Upper clamp 5 and lower clamp 4 outside winding 3
The structure is such that the space is fastened with studs 6, so that the floor area becomes large.

(4) A conventional wound iron core transformer formed by winding an amorphous magnetic alloy ribbon having a winding support portion for a winding or a yoke support portion for a wound iron core has a winding support. In the process of assembling the wound iron core type transformer, the winding support and the yoke support become The transformer winding may be damaged by contact with the transformer winding, and the reliability of the transformer itself may be impaired.

The present invention has been made to solve the above drawbacks,
An object of the present invention is to provide a wound iron core stationary induction device in which the rigidity of the wound iron core is favorably increased without deteriorating the magnetic properties and quality of the amorphous magnetic alloy ribbon.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a wound iron core in which a winding is mounted on a rectangular wound iron core formed by winding an amorphous magnetic alloy ribbon. In the stationary electric induction machine of the type, a pair of side surface contact plates bent in an L-shape are respectively disposed at corners outside both legs of the wound core, and a pair of clamps are respectively disposed at upper and lower portions of the wound core. The upper and lower levers are configured to be clamped in the width direction of the wound core via the side surface contact plate.

(Operation) According to the wound core static induction device of the present invention, the tightening force of the wound core is not applied to the vertical direction of the wound core, but is applied in the width direction to support and fix the wound core. There is no displacement in the width direction of the wound core due to the above, and the wound core is not damaged or the magnetic characteristics are not deteriorated. In addition, since the side plate has an L shape, the rigidity of the plate itself is high, and the lower core and the upper clamp are used to tighten and fix the winding core to form an integrated structure. The power is also improved, and it has sufficient strength against vibration during transportation and earthquakes. Further, since the side portion contact plate is formed in an L shape, the plate thickness can be made relatively thin, and it can be placed in a small space in the insulating cylinder of the winding core and the winding, thereby reducing the size and weight of the device. be able to.

(Example) An example of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of one embodiment of the present invention, and FIGS. 2 and 3 are a right side view and a plan view of FIG. 1, respectively.
In these figures, the amorphous magnetic alloy ribbon 1 is wound,
Two winding cores 2a and 2b formed in a rectangular shape are arranged side by side in the width direction and combined to form a winding core 2. A winding 3 is attached to both legs of the winding core 2.
Is installed. Here, the wound cores 2a and 2b are
0a, 10b and upper and lower clamps 9, 11 for fastening. As shown in FIGS. 5 (a), 5 (b) and 5 (c), the side contact plates 10a and 10b are formed of a non-magnetic plate (for example, stainless steel) bent in an L-shape. Boss 16
, And a hole 17 at the upper end. This boss 16
The holes 17 are provided on the surface side in contact with the iron core width direction. There is no particular limitation on the X dimension of the side contact plates 10a and 10b, but the Y dimension is set to a value smaller than 1/2 of the tightening iron core width (10 to 20m).
m).

On the other hand, the upper clamp 11 is made of a steel plate bent in an L-shape as shown in FIGS. 6 (a) and 6 (b), and bosses 18, which are fitted at both ends into holes of the side plate 10a, 10b. 18 are provided. The lower clamp 9 is made of a steel plate having a U-shaped cross section, and has holes (not shown) at both ends where the bosses 16, 16 of the side surface contact plates 10a, 10b are fitted. Then, as shown in FIG. 4, the pair of side surface contact plates 10a and 10b are placed in the insulating cylinders of the windings 3 so as to be disposed at corners outside both legs of the wound cores 2a and 2b, respectively. After that, a pair of lower clamps 9 are arranged so as to sandwich the lower ends of the pair of side surface contact plates 10a and 10b from outside, and provided on the boss 16 and the lower clamp 9 of the side surface contact plates 10a and 10b. Fit the holes. Next, the lower clamp 9 is fastened between the lower clamp 9 with the stud 15 and the nut 8, and the lower crossbar 12 and the base 13 are attached.

On the other hand, the pair of upper clamps 11 are disposed so as to sandwich the upper end of the side portion abutting plates 10a and 10b from the outside, and the bosses 16 provided at the ends thereof are fitted into the holes of the side portion abutment plates 10a and 10b. Then, the space between the upper clamps 11 is tightened by the stud 15 and the nut 8, and the space between the upper clamps 11 is further integrated by the upper cross bar 14.

Although the bosses 16 are provided at the lower ends of the aforesaid plates 10a and 10b, they may be provided only at the upper ends, or holes may be provided at both ends. That is, even if the space between the core leg width direction and the short side of the winding insulating cylinder is reduced, it is possible to use the space to insert the side surface contact plates 10a and 10b inside the winding insulating cylinder. do it.

As described above, according to the present embodiment, the clamping force is applied in the width direction of the iron core, and no force is applied in the vertical direction of the wound iron cores 2a and 2b. Magnetic characteristics (iron loss, excitation capacity) can be maintained. Since the side part abutment plates 10a, 10b, the upper and lower part clamps 9, 11 and the upper and lower part crossbars 12, 14 are integrally connected, and since the side part abutment plates 10a, 10b are formed in an L shape, rigidity is increased, The rigidity in the front-rear and left-right directions as a device is high, and the stress applied to the wound cores 2a and 2b is small even with respect to vibration or impact due to external force. Therefore, there is little influence on the magnetic characteristics of the wound cores 2a and 2b, and stable quality is ensured. Further, since the upper and lower clamps 9, 11 are connected by the side contact plates 10a, 10b disposed in the winding insulating cylinder, there are many advantages such as downsizing.

In the present embodiment, two wound cores are combined, but it is needless to say that the present invention can be applied to the case of one or three or more wound cores.

[Effects of the Invention] As described above, according to the wound iron core stationary induction device of the present invention, there is no displacement in the wound iron core width direction due to excitation vibration or mechanical vibration, and the wound iron core is damaged or the magnetic characteristics are deteriorated. Never. In addition, since the side part contact plate is L-shaped,
The rigidity of the plate itself is high, and the lower and upper clamps are used to tighten and fix the wound core to form an integrated structure, which improves the rigidity of the entire transformer and reduces vibration during transportation and earthquakes. Also has sufficient strength. Furthermore, since the side portion contact plate has an L shape, the plate thickness can be made relatively thin, and it can be placed in a small space in the insulating cylinder of the winding core and the winding, and when assembling a transformer, a conventional method is used. Since such a structure does not require the winding support for the winding and the yoke support for the winding core, there is no danger of damaging the transformer winding, and the size and weight of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of the present invention, FIG. 2 and FIG.
FIG. 4 is a right side view and a plan view of FIG. 1, FIG. 4 is a sectional view taken along the line IV-IV of the transformer of FIG. 1, and FIGS. 5 (a), (b) and (c) are used in the present invention. 6 (a) and 6 (b) are front and side views of an upper clamp used in the present invention, and FIGS. 7 and 8 are conventional wound iron cores. 9 is a perspective view in which two conventional wound iron cores are arranged, and FIG. 10 shows the relationship between the core clamping force and iron loss in an amorphous magnetic thin ribbon wound iron core. FIG. DESCRIPTION OF SYMBOLS 1 ... Amorphous magnetic alloy ribbon 2a, 2b ... Winding core 3 ... Winding 8 ... Nut 9 ... Lower clamp 10a, 10b ... Side plate 11 ... Upper clamp 12 ... Lower cross bar 13 ... Base 14 ... Upper cross Bar 15… Stud 16 Boss

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsuyoshi Horiuchi 2121 Asahi-cho, Mie-gun, Mie Prefecture 2121 Naoyo, Toshiba Mie Plant (56) References JP-A-60-18906 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) H01F 27/30

Claims (1)

(57) [Claims] 1. A wound iron core type stationary induction machine in which a winding is mounted on a rectangular wound iron core formed by winding an amorphous magnetic alloy ribbon, and a pair of side surface contact plates bent in an L shape are provided. A pair of upper and lower clamps are respectively disposed at the upper and lower portions of the core, and the upper and lower clamps are respectively disposed on the corners outside the two legs of the core. Direction and the upper clamp is L
The lower clamp is formed in an L-shape, and the lower clamp is formed in a U-shape in cross section, and the lower core is tightened on the outer side of the U-shape, and the upper and lower clamps are further bent. Is a wound iron core stationary induction device characterized in that the clamps are further integrally connected by an upper cross bar and a lower cross bar.