JPH0124908Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an electromagnetic induction device such as a transformer that is smaller and lighter by reducing the gap between the core contact plate provided on the closed circuit core leg and the winding core. It is.

Conventionally, there have been transformers of this type as shown in FIGS. 1 to 3. That is, in FIGS. 1 to 3,
Reference numeral 1 denotes a closed-circuit core made of laminated thin steel plates and has a leg portion 110 and a yoke portion 120. Reference numeral 2 denotes a winding wound on a winding core 3 and inserted into the closed-circuit core leg portion 120. The wires 4 are in contact with both end surfaces of the core leg portion 120 in the stacking direction, and are connected to the core leg portion 11 by the insulating band 5.
0 is a core stopper plate configured to be tightened uniformly, 6 is a stop plate fixed to the surface opposite to the core at the upper and lower ends of the core stopper plate 4, and 7 is an end frame 8 for tightening the core yoke part 120. a stop plate 9 fixed to and engaged with the stop plate 6;
is a hanging hand attached to the upper side of the upper end frame 8. Here, the load when the iron core and the entire winding are lifted by the hanger 9 and the mechanical force when an axial electromagnetic mechanical force is generated on the winding 2 are the end frame 8, the stop plate 7, the stop plate 6,
It is configured to be transmitted in order of the core abutment plate 4 and held by the core abutment plate 4. 10 is foot money, 11 is winding 2
This is a bolt for tightening the end frame 8 to the end frame 8.

In this conventional device, when inserting the winding 2 wound around the winding core 3 into the core leg portion 110 having the core contact plate 4, the winding 2 wound around the winding core 3 is After lifting the wire 2 and inserting the stop plate 6 fixed to the upper end of the core stopper plate 3 into the inner diameter space of the winding core 3, a thin steel plate is inserted into the upper core yoke part 120. An upper core yoke portion 120 was formed.

Therefore, the inner diameter dimension D of the winding core 3 is determined by the dimensional tolerance of the diameter dimension φ ₂ of the circumscribed circle 13 of the two corresponding stop plates 6 and the machining allowance dimension when inserting the winding wire 2, as shown in FIG. The dimension in which d is added, that is, D = φ ₂
It becomes +2d. As mentioned above, the stop plate 6 must withstand the load when the entire core and windings are lifted and the axial electromagnetic mechanical force generated in the winding 2. It becomes 16mm.

For this reason, the inner diameter dimension D of the winding core 3 had to be made larger than necessary compared to the diameter φ ₁ of the circumscribed circle 12 of the core leg portion 110 and the core contact plate 4. Moreover, the difference between the inner diameter dimension D of the winding core 3 and the diameter φ ₁ of the circumscribed circle 12 of the contact plate 4 is a dimension necessary for inserting the winding wire 2 into the core leg 110, and is not an electromagnetically necessary dimension. do not have. Normally, the windings of a transformer are arranged such that the low voltage winding is placed on the inner diameter side and the high voltage winding is placed on the outer diameter side, so the dimension D- _φ1 required for electromagnetism is usually twice the machining allowance dimension d. It is sufficient.

For this reason, the inner diameter D of the winding core 3 increases by an amount of φ ₂ - φ ₁ , which increases the diameter of the winding 2, which increases not only the weight of the winding and core but also the size of the entire transformer, which increases the price. It was hot. Furthermore, due to the increased weight of the windings and core, losses such as copper loss and iron loss also increase, resulting in a reduction in the efficiency of the transformer.

This idea was made in order to eliminate the drawbacks of the conventional ones. When inserting the winding into the core leg, the upper end of the core contact plate is elastically deformed to the opposite side. The purpose of the present invention is to provide a transformer in which the inner diameter of the winding core can be reduced to the minimum required size by reducing the dimension between the two stop plates.

An embodiment of this invention will be described below with reference to FIGS. 4 to 6.

That is, in Figures 4 to 6, 1 to 13 are the first
Although it is similar to the conventional one shown in Figs. 3 to 3, the difference from the conventional one is that the inner diameter dimension D of the winding core 3 is the diameter of the circumscribed circle 12 of the two core contact plates 4 that face each other. The diameter φ ₂ of the circumscribed circle 13 of the two stop plates 6 facing each other is set to a value φ ₁ <D < φ ₂ which is larger than φ ₁ and elasticity is applied to the opposing sides of the core contact plates 4. Due to the deformable structure, when the winding 2 is inserted into the core leg portion 110 as shown in FIG. 5, the 42 core contact plates are elastically deformed and inserted into opposing sides.

Here, the machining allowance dimension d is d=D-φ ₁ /2.

In the structure configured in this way, the closed circuit iron core 1
In a state where there is no core yoke part 120 at the top of the
When inserting the winding 2 wound around the winding core 3 into the core leg 110, the stop plate 6 is inserted into the winding core 3 as shown in FIG.
Since it protrudes from the inner diameter dimension D, it cannot be inserted as is. In this case, since the upper core yoke part 120 has not yet been inserted in the core 1, there is a gap between each blank plate of the core leg part 110 in this part. 4 is elastically deformed by, for example, tightening a steel band (not shown) to the upper end of the core stop plate 6, so that the stop plate 6 forms the circumscribed circle 12.
The rear winding 2 is inserted into the core leg ₁₁₀ by deforming it inward so that it fits inside the diameter φ 1 of the core leg 110 . Winding 2
After inserting the steel band, remove the iron core contact plate 4.
The tip returns to its original straight shape. Thereafter, a blank plate made of thin steel plate is inserted into the upper yoke part 120 to form the upper core yoke part 120, and the closed circuit iron core 1 is assembled to the state shown in FIG. 4.

When inserting the winding 2 into the core leg part 110 in this way, the core abutment plate 4 is elastically deformed, and the stop plate 6 is moved within the diameter φ ₁ of the circumscribed circle 12 of the core leg part 110 and the core abutment plate 4. As a result, the inner diameter dimension D of the winding core 3 can be reduced to the minimum necessary dimension, the winding diameter can be reduced, and the winding weight and
The weight of the core as well as the entire transformer can be reduced in size and weight. In addition, the efficiency of the transformer is improved because copper loss and iron loss are reduced.

In addition, in the above embodiment, the leg portion 1 of the closed circuit iron core 1
10 has a circular cross section, but the 7th
As shown in the figure, a leg portion 110 having a rectangular cross section can also be constructed in the same manner.

As mentioned above, the electromagnetic induction device according to this invention is
A core contact plate for tightening the core leg is provided on the opposing sides of the core leg formed by laminating core blanks made of thin steel plates, and a stop plate is fixed to the end of this core contact plate. , in which a winding wire is wound around a winding core placed around the outer periphery of the core leg, the inner dimensions of the winding core are set so that the stop plate can be accommodated but the stop plate protrudes, making it compact and lightweight. improves efficiency.

[Brief explanation of the drawing]

Figures 1 to 3 all show conventional electromagnetic induction devices of this type, with Figure 1 being a cross-sectional side view of the main parts;
Figure 2 is a side view showing the assembly process of the main parts, Figure 3 is a partial sectional view, Figures 4 to 6 all show one embodiment of this invention, and Figure 4 is a cross-section of the main parts. Side view, Figure 5 is a side view showing the assembly process of the main parts, Figure 6
The figure is a partial sectional view, and FIG. 7 is a partial sectional view showing another embodiment of this invention. In the figure, 1 is a closed circuit core, 110 is a core leg, 1
20 is a core yoke portion, 2 is a winding, 3 is a winding core, 4 is a core stopper plate, 6 and 7 are stop plates, and 8 is an end frame. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A core leg formed by laminating core blanks made of thin steel plates, and an elastically deformable leg provided on opposing sides of the core leg to tighten the core leg. A core contact plate, a stop plate fixed to the outside of the end of the core contact plate, and a winding wound around a winding core arranged around the outer periphery of the core leg, and the inner dimensions of the core are set to the above-mentioned contact plate. An electromagnetic induction device in which the plate can be stored, but the stop plate is set to a protruding value. (2) The electromagnetic induction device according to claim 1, wherein the winding is inserted from the end of the core leg while the core contact plate of the core leg is elastically deformed.