JPS6083307A - Wound core type stationary induction apparatus - Google Patents

Abstract

PURPOSE:To increase rigidity satisfactorily without reducing magnetic characteristics by assembling an L-shape reinforcement plate at each inside corner of a wound core and attaching to an iron core clamp with a clamping member. CONSTITUTION:A reinforcement plate 13 of a non-magnetic metal plate is assembled with a wound core 11 at each outside corner wound with a thin belt 12 in a process of making the wound core 11 winding the amorphous magnetic alloy thin belt 12. Each reinforcement plate 13 is attached to a lower iron core clamp and an upper iron core clamp and fixed. In this case, the positions of fittings 13c and 18 are so set that a bolt 19 is placed along the laminated direction of the corner of the wound core 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] “The present invention relates to a wound core type stationary induction appliance made of an amorphous magnetic alloy ribbon.

[Technical background of the invention and its problems]

Recently, wound cores installed in stationary induction electric appliances such as transformers and reactors are using amorphous magnetic alloy thin strips instead of conventional silicon steel strips as core feed. VIL-shi red form seven h
Input: This amorphous magnetic alloy ribbon is manufactured by ultra-quenching the molten alloy f: and has excellent magnetic properties with significantly lower core loss and excitation current than silicon 9゛4 ribbon. However, due to manufacturing reasons, the thickness is about 30 to 50 μm, which is very thin compared to silicon steel strips, and the width is also narrow. For this reason, a wound core formed by winding an amorphous magnetic alloy ribbon has a problem of low rigidity. Therefore, in order to improve the workability of winding assembly, it is necessary to take measures to strengthen the winding core and increase its rigidity. In this case, since the amorphous magnetic alloy ribbon has the property that its iron loss resistance decreases when compressive force is applied, it is important to prevent compressive force from being applied to the wound core. be.

Conventionally, in order to increase the rigidity of a wound core made of an amorphous magnetic alloy ribbon, as shown in FIG.
There is a method in which an insulating tape 3 is wrapped around a rectangular wound core 1 formed by winding the insulating tape 3, and a adhesive or the like is applied onto the insulating tape 3 to solidify it. According to this method, the applied agent penetrates into the inside of the wound iron core 1 and solidifies, so that the rigidity can be further reduced. However, since the adhesive has a thermal expansion coefficient about 10 times higher than that of the amorphous magnetic alloy ribbon, compressive stress strain is generated inside the wound core 1 during the solidification process. For this reason, there is a drawback that the core loss characteristics of the wound core made of the amorphous magnetic alloy ribbon decrease by several percent to several tens of percent. Moreover, since the insulating tape 3 must be wound in large numbers, the number of processing steps is large.

Another method for increasing the rigidity of the wound core is to insert a reinforcing ring 4 made of a non-magnetic plate on the inner circumference of the wound core 1 during the ribbon winding process, as shown in FIG. be. However, since an amorphous magnetic alloy ribbon has a hardness approximately five times that of a silicon steel sheet and is brittle, increasing the tension at which the ribbon is wound will result in uneven tension in the width direction. Thin ribbon 2 breaks. On the other hand, if the ribbon 2 is wound with a small winding tension, the ribbon layer will not be tightly packed, and even if the reinforcing ring 4 is provided at the time of winding the ribbon and the ribbon 2 is wound, the wound core 1
When the iron core 1 is stood up and assembled into a core clamp, the leg portions of the wound core 1 sag due to their own weight, which results in an increase in iron loss due to the application of shaft stress to the wound iron core 1.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned QJ situation, and provides a stationary induction device equipped with a wound core made of an amorphous magnetic alloy ribbon that has improved rigidity without deteriorating its magnetic properties. It is.

[Summary of the invention]

The wound iron core type stationary induction electric appliance of the present invention incorporates L-shaped reinforcing plates at each corner of the inner peripheral side of the wound iron core made of an amorphous magnetic alloy ribbon, and each of these reinforcing plates It is attached to a core clamp via clamping members arranged along the stacking direction of the corners of the core, and these clamping members are tightened.

[Embodiments of the invention]

An example of the Kinoi IJJ shown in the drawings will be described below.

3 to 5 show one embodiment of the present invention.

In the figure, reference numeral 11 indicates a rectangular wound core formed by winding an amorphous magnetic alloy ribbon 2, and reference numeral 13 indicates a non-contact core installed in each corner of the inner peripheral side of the wound core 1. This is a reinforcing plate made of a magnetic metal plate. An L-shaped inner circumferential surface abutting portion 13a that abuts the corner inner circumferential surface of the reinforcing plate 13d-wound core 1;
side abutting portions 13b that abut on both sides of the wound core 1, respectively;
13b, and a mounting piece 13C213c having a mounting hole projecting laterally from the abutting portions 13b and 13b.The reinforcing plate 13 is formed by winding the amorphous magnetic alloy ribbon 12 into a wound core. 11, the thin strips 12f are provided at each corner on the outer circumferential side of a winding core (not shown), and the thin strips 12f are formed around the corners.
It is incorporated into the wound core 11 by winding it. and,
The winding core 1 is arranged in the radial direction [2 pieces are arranged side by side, and each winding core 1
Volume IIi on the adjacent leg of 1! 2) are commonly wrapped. Further, each core 11 is fixed to a lower core clamp 14 and an upper core clamp 15.

The lower clamp 14 surrounds the lower silicate part and legs of the wound core 11 from the outside, and is installed in a transformer tank (not shown). The upper core clamp 15 has two wound cores 11
Studs 16 surround the upper silicate part from above and are provided vertically at both ends of the lower core clamp 140, respectively.
It is fixed by tightening nuts 17 at 16 degrees.

Further, on both sides of the lower core clamp 140 and on both sides of the upper core clamp 15, mounting pieces 13a and 13c of the reinforcing plate 13 provided at each corner on the inner peripheral side of the two wound cores 11 are provided, respectively. A mounting piece 18.18 having a mounting hole is provided in the cylindrical portion and projects laterally. Then, insulating bolts 19 are passed through the mounting holes of the mounting pieces 13c and 18 that face each other, and the insulating nuts 20 screwed onto the bolts 19 are tightened to attach each reinforcing plate 13 to the lower part. It is fixedly attached to the core clamp 14 and the upper core clamp 15. Therefore, the wound core 1 is tightened and fixed to the lower and upper core 2 pumps 14 and 15 via each reinforcing plate 13. In this case, the mounting piece 13c and the mounting piece 1
Set the position of 8.

Therefore, a clamping force is applied to each corner of the wound core 1 from the top of the inner peripheral surface to the top of the outer peripheral surface, and a component of this clamping force is applied to each corner of the wound core 1. and a tensile force acts on the legs. In addition, in order to prevent compressive force from being applied to the wound core 11, the lower core clamp 14 and the upper core clamp 15 are held at both clamps 14° and 15 so as not to come into contact with each other.
Although not shown in the figure, it is installed separately from the
A winding support is inserted between the lower core clamp 14 and the winding 2 to prevent the weight of the winding IfI1.21 from acting on the core.

According to such a configuration, the wound core 1 can be held in a strong state by applying tension to the wound core 1 to smooth out the slack in the legs. Further, the dead weight of the wound core 11 and the heat of the winding 21 are not added to the wound core 1. Therefore, the wound core can be made rigid without applying compressive force, and the excellent magnetic properties of the amorphous magnetic base metal ribbon can be further improved. Further, the work of holding the wound core can be easily performed. Furthermore, if the wound iron core 1 is used in a state where an eccentric force is applied, the magnetostriction is also reduced, and the generation of noise can also be reduced.

Note that the reinforcing plate provided with the wound core 1111c is not limited to the shape of the embodiment described Q+. In the reinforcing plate 13 shown in the embodiment, the contact portion 13b that contacts the side surface of the wound core 1 can serve as a guide for winding the amorphous magnetic alloy ribbon during forming the wound core.

In addition, the fastening part for quickly connecting the reinforcing plate and the iron lL1 crank is not limited to bolts and nuts, and for example, thermosetting resin tape can be used.

Furthermore, the present invention is not limited to the case where there are two wound cores, but can be similarly applied to cases where one or three or more wound cores are arranged in parallel.

〔Effect of the invention〕

As explained above, the wound core type stationary induction electric appliance of the present invention has the following features:
The wound core made of the amorphous magnetic alloy ribbon can have good rigidity and exhibit excellent magnetic properties.

[Brief explanation of drawings]

Figure 1 is a perspective view showing an example of a conventional wound core, and Figure 2 (a
) is a perspective view showing another example of the conventional wound core, (b) is a perspective view showing a reinforcing plate used in the wound core, FIG. FIG. 4 is a front view showing the wound core, and FIG. 5 is a perspective view showing the reinforcing plate. 11...Wound core, 12...Amorphous magnetic alloy ribbon, 1
3... Reinforcement plate, 14... Lower iron core 2 ring, I5.
... Upper core clamp, 18... Mounting piece, 1g...
Mounting bolt, 20... Pick-up nut, 2... Winding wire. b Applicant's agent Patent attorney Rin Press type Required Figure 1 Figure 2 (a) (b)

Claims (1)

[Claims] L-shaped reinforcing plates are assembled in contact with each corner of the inner circumferential side of a rectangular wound core formed by winding an amorphous magnetic alloy ribbon, and each of these reinforcing plates A wound core type stationary induction electric appliance that is attached to a core clamp via clamping members arranged along the stacking direction at the corners of the core, and each of these clamping members can be tightened.