TWI638371B - Core joint construction of electromagnetic machine - Google Patents

Abstract

In the present invention, there is provided a height without increasing the core, and The structure for reducing the loss occurring in the metal fitting for locking.

A transformer core structure with a sense of static In the laminated core of the electromagnetic steel sheet or the amorphous ribbon of the electric appliance, the maximum dimension in the horizontal direction of the cross section of the horizontal yoke disposed on the upper portion of the core is the foot in the vertical direction of the winding of the wound core The maximum dimension of the horizontal direction of the section is also large.

Description

Core joint construction of electromagnetic machine

The present invention relates to a core structure of an electromagnetic machine, particularly a stationary induction machine.

The static induction machine is a machine that changes the voltage by the action of a magnetic field and the coupling of a reactor or magnetic coupling that adjusts the impedance. This is a large number of iron cores and windings. The iron core is a portion in which the magnetic flux density and the sectional area are related to basic specifications such as the number of windings of the winding. As the structural material, an electromagnetic steel sheet or a magnetic thin strip is used. The material is used in accordance with the use. For example, a transformer for electric power used in a transformer of a substation or a transformer for a pole is a core of an amorphous structure in which an electromagnetic steel sheet or an iron system is laminated. In the inner-iron type transformer, the horizontal direction portion disposed on the upper and lower portions of the core is referred to as an upper portion and a lower yoke, and the portion in which the vertical arrangement winding is in the axial direction of the winding is referred to as a foot. The iron core is used as a structure, and has a metal locking metal for locking the upper and lower yokes, a headless bolt for connecting the locking metal fittings, and other metal members provided at the lower portion of the core in order to maintain the shape. Wait. In particular, the locking metal is positioned at the upper and lower sides of the winding axis, because the AC magnetic flux (hereinafter referred to as leakage magnetic flux) generated from the winding acts, and the metal is acted upon by the electromagnetic induction. With internal current (in Next, it is recorded as eddy current). Because of this current, Joule heat loss occurs in the metal for locking, which causes deterioration in efficiency. For this reason, in terms of low loss of the transformer, efforts have been made to suppress the Joule heat loss of the metal for locking.

Japanese Patent Publication No. 2014-216524 (Patent Document 1) is widely known as a prior art. Patent Document 1 proposes a method of forming a magnetic path toward the core side via a block-shaped body in which a magnetic material is placed between the metal fitting for locking and the coil, so that the leakage magnetic flux from the winding does not face the lock. Use the metal to enter the structure. As a result, the loss of the metal for locking is suppressed.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2014-216524

However, in the case where a block of a magnetic material is disposed between the winding and the metal fitting for locking, it is necessary to secure a space in which the block of the magnetic material is disposed, and the height of the core is increased. Here, in the present invention, there is provided a structure in which the height of the iron core is not increased and the loss occurring in the metal fitting for locking is reduced.

In order to solve the above problems, the present invention utilizes a core structure in which a foot that is wound around a core is wound and disposed. In the yoke in the horizontal direction, the cross-sectional shape of the yoke is longer in the horizontal direction than the cross-sectional shape of the leg. As a result, since the yoke is disposed on the winding portion, the loss occurring in the metal fitting for locking can be reduced.

According to the present invention, in the core which is the core of the wound winding and the yoke which is disposed in the horizontal direction, the cross-sectional shape of the yoke is longer than the cross-sectional shape of the leg and is long in the horizontal direction. The structure has the effect of reducing the loss occurring in the metal fitting for locking.

1‧‧‧ iron core

2‧‧‧Low voltage winding

3‧‧‧High-voltage winding

4‧‧‧Locking metal fittings

5‧‧‧Insulators

6‧‧‧Rigid parts

7‧‧‧Fixed bolts

11‧‧‧ upper yoke

12‧‧‧ Lower yoke

13‧‧‧ feet

20‧‧‧ slots

21‧‧‧Slot cover

22‧‧‧ leakage flux

30‧‧‧Insulator block

Fig. 1 is an explanatory view showing a form of the present invention.

Fig. 2 is an explanatory view of a core of the type of the present invention.

FIG. 3 is an explanatory diagram of a conventional iron core.

Fig. 4 is an explanatory view of a conventional core and a peripheral structure.

Fig. 5 is an explanatory view of a conventional core and a peripheral structure.

Fig. 6 is an explanatory view showing a second embodiment of the present invention.

Hereinafter, embodiments related to the present invention will be described.

[Example 1]

In the beginning, explain the construction of the transformer. Figure 3 shows the core of the transformer. The core 40 of the transformer is formed by laminating an electromagnetic steel sheet or an amorphous ribbon. The horizontal direction portion disposed at the upper and lower portions of the core is referred to as an upper yoke 41 and a lower yoke 42 to align the vertical arrangement The portion of the winding in the axial direction is referred to as a foot 43. The construction of the transformer is shown in FIG. The transformer is a core 14 formed by laminating an electromagnetic steel sheet or an amorphous ribbon, and winds the low-voltage winding 15 and the high-voltage winding 16. Further, although the winding system is not shown, it is composed of two or more of a low-voltage winding, a high-voltage winding, and a tapped coil. In the core, in order to maintain the shape, a metal fitting 17 for locking is provided. The locking metal fittings 17 are arranged to be compressed in the stacking direction of the upper yoke of the core 14. Further, as the structure for holding the windings 15 and 16, the insulator 18 is disposed on the winding portion and the lower portion, and the member 20 having high rigidity such as metal is interposed therebetween, and the pressing bolt 19 provided on the locking metal fitting 17 is used. . The core 14 and the windings 15 and 16 thus constructed are placed in the groove 20, impregnated with oil, and covered with a groove cover 21.

Next, the loss occurring in the metal fitting 17 for locking will be described. When a current flows through the windings 15 and 16 of the transformer configured as described above, the leakage magnetic flux 21 occurs. The leakage flux 21 is diffused in space, and an eddy current due to the law of electromagnetic induction occurs in the metal object. The Joule heat loss caused by the eddy current becomes a factor of the loss of the transformer. In particular, the metal fitting 17 for locking is a structure close to the winding, and is greatly affected by this. Therefore, as shown in Fig. 5, countermeasures are taken. In the countermeasure, a block body 30 made of a magnetic material is provided between the locking metal fitting 32 and the upper and lower components 31 disposed on the winding. The block body 30 is generally formed by laminating a steel sheet. With such a configuration, the leakage magnetic flux 35 generated from the windings 33 and 34 does not reach the locking metal fitting 32 and flows into the core 36. That is, the loss occurring in the locking metal fitting 32 can be suppressed.

Next, a first embodiment of the present invention is shown in Figs. 1 and 2 . Fig. 1 is an explanatory view of a first embodiment. This embodiment does not increase The structure in which the height of the core is increased and the loss of the locking metal is reduced. The width of the core 1 in the stacking direction is different between the upper yoke 50 and the foot 51. Specifically, the thickness L1 in the lamination direction of the upper yoke and the L2 of the leg are in the relationship of the formula (1). Further, although not shown, the lower yoke of the core is formed such that the width L1 in the stacking direction is the same as that of the upper yoke 50.

L1>L2...(1)

Thereby, the upper yoke 50 is formed in the upper part of the windings 2 and 3. On the upper portions of the windings 2 and 3, an insulator 5 and a highly rigid component 6 are disposed. The high-rigidity part 6 is wound by a pressing bolt 7 provided in the locking metal fitting 4 of the upper yoke. With such a configuration, the leakage magnetic flux generated by the windings 2 and 3 can directly flow into the core 1. Further, although not shown, the lower yoke of the core 1 has the same structure. Fig. 2 shows the core structure of the 3-phase device. As described above, the relationship between the width L1 in the stacking direction of the upper yoke 11 and the lower yoke 12 and the width L2 in the stacking direction of the leg 13 is the same as the formula (1). Also, the configuration of the three-phase 5-foot device and the single-phase device is the same.

In the present embodiment, the above-described structure of FIGS. 1 and 2, the conventional structure, that is, the block body 30 of the magnetic body of FIG. 5 may be unnecessary, and the magnetic body may be reduced. The space of the block 30. As a result, it is possible to provide a core structure which can reduce the size of the core in the height direction.

[Embodiment 2]

Next, a second embodiment of the present invention is shown in Fig. 6 . In the present embodiment, the structure of the core is different from that of the first embodiment. By. The volume of the leakage flux generated from the windings 61 and 62 is absorbed to the upper yoke 63 of the core 60, and the effect of the upper portion of the upper yoke 63 is small, and the insulator 64 can be provided in this range. On the upper portions of the windings 61 and 62, an insulator 67 and a member 68 having high rigidity are disposed. The highly rigid member 68 holds the windings 61 and 62 by the pressing bolts 69 of the locking metal fitting 65 provided on the upper yoke. In this case, the relationship in which the width of the upper yoke 63 in the stacking direction is the largest is L1, and the relationship between the width L2 in the stacking direction of the legs is the same as the formula (1). With such a configuration, the amount of the ruthenium steel sheet can be reduced.

In the present embodiment, the above-described structure of FIGS. 1 and 2, the conventional structure, that is, the block body 30 of the magnetic body of FIG. 5 may be unnecessary, and the magnetic body may be reduced. The space of the block 30. As a result, it is possible to provide a core structure which can reduce the size of the core in the height direction.

Claims (2)

A transformer core structure is a laminated iron core of a static induction electric appliance or a laminated core of an amorphous ribbon, and a horizontal dimension of a cross section of a horizontal core yoke disposed at an upper portion of the core is a volume The maximum dimension in the horizontal direction of the cross section of the core leg in the vertical direction around the winding of the core is also large; from the maximum dimension of the core leg, in the range of the large yoke, the insulator is contained in the upper portion of the yoke. A transformer core structure comprising: a transformer core structure according to claim 1 and a metal fitting for locking the core yoke; an insulator disposed on a winding portion of the metal fitting for locking, and Pressing the pressing part of the insulation.