JPH0155565B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a transformer winding structure in which high voltage windings and low voltage windings each consisting of a plurality of rectangular plate coils are arranged alternately in the axial direction.

[Prior art and its problems]

In an external iron type transformer in which high-voltage windings and low-voltage windings are arranged alternately in the axial direction, it is required to minimize the electromagnetic mechanical force acting between the windings.

FIG. 1 is a cross-sectional view of a transformer in which high-voltage windings and a plurality of low-voltage windings are arranged alternately. 1a and 1b are the main leg portions and yoke portions having a rectangular cross section of the outer iron core 1, and 1c is the main leg portion and yoke portion. This is an insulating tube attached to the leg portion 1a. Reference numeral 2 denotes a high-voltage winding, for example, three rectangular plate-shaped coils connected in series, the starting and ending ends of which are connected to a pair of high-voltage terminals 4a through lead leads 5a. Further, 3a, 3b, 3c, and 3d are a plurality of low-voltage windings, each formed as a rectangular plate-shaped coil, and the starting and ending ends of each winding are connected to the low-voltage terminal 4b by a pair of lead leads 5b. ing. In the illustrated example, low voltage windings 3a, 3b and 3c, 3d are arranged on both sides of the high voltage winding 2 in the axial direction, forming so-called alternately arranged windings. In addition, a barrier 6 having a duct spacer is interposed between each winding or each coil to form a cooling duct between each coil.
Insulation between coils is maintained. Also stacked iron core 1
The contents of the transformer with the windings 2 and 3 inserted into the legs are press-fitted into the divided tanks 7a and 7b via the spacing piece 8, and assembled so that a predetermined tightening load is applied in the axial direction of the windings. .

By the way, in the windings arranged alternately as mentioned above, the electromagnetic mechanical force that acts between the windings due to the short-circuit current is mainly in the stacking direction of the rectangular plate-shaped coils (hereinafter, in the same way as the coaxially arranged windings, in the axial direction). It acts in the direction of the winding width (W in the figure) of the coil (hereinafter referred to as the radial direction, following the coaxial arrangement of windings). Therefore, it is not necessary to make the coil circular, and both the high-voltage and low-voltage windings are formed into rectangular plate-shaped coils. However, in order for the electromagnetic mechanical force to act only in the axial direction as described above, the geometrical position Mo of the magnetic center where the ampere-turn distribution in the width W direction of each rectangular plate coil is symmetrical must be set in the axial direction for each rectangular plate coil. The condition is that they are in the same position. In other words, in a coil in which an insulated conductor is wound into a rectangular plate shape, the center position of the coil in the width direction W coincides with the magnetic center position, so the center position of each coil in the width direction coincides with each other in the axial direction of the coil. The above conditions can be satisfied by arranging the windings so that the positions of the windings are the same.
However, in the parts where there are crossover wires and lead leads 5a, 5b for connecting the rectangular plate-shaped coils, the above conditions are not satisfied mainly due to the difference in the conductor cross-sectional area of the high and low voltage windings. There is a problem in that radial electromagnetic mechanical force is generated in this part.

FIGS. 2 and 3 are conceptual diagrams of a conventional rectangular plate coil. In Fig. 2, reference numeral 3 denotes a rectangular plate-shaped coil in which one insulated conductor is wound, for example, three turns around a rectangular winding frame.
An output lead 5 is provided on the outside of the coil. In the transition portion 9, the insulated conductor is bent in the axial direction of the coil and pulled out in the axial direction, so that a hole is formed in the hatched area in the figure. Therefore, a filling 10 made of an insulating material is interposed in this part to make the coil 3
The inner circumferential surface of the iron core is formed so as to be in close contact with the leg portion 1a of the iron core covered with an insulator 1c as shown in FIG. Second
The magnetic center position Mo of the rectangular plate coil 3 formed as shown in the figure is A, B, C, D in the circumferential direction of the coil.
In the part where the stuffing 10 is not interposed, it is located at a position that coincides with the center position of the coil width, that is, at the same distance from the inner peripheral surface of the coil 3, but in the part where the stuffing 10 is interposed, the thickness of the stuffing The position _E1 shifted outward by _t1 becomes the magnetic center Mo, which is different from the magnetic center positions of the other positions A, B, C, and D.

In addition, Fig. 3 shows a rectangular plate-shaped coil in which three parallel insulated conductors are overlapped in the axial direction of the coil 3 and wound for two turns, and the thickness t ₂ of the stuffing 10 is the thickness of three conductors. In addition, the deviation of the position of the magnetic center Mo at the F position where the filling 10 is interposed is extremely large.

In general, high-voltage windings have a small conductor cross-sectional area and a small filling thickness t, so the displacement of the magnetic center Mo is small. However, low-voltage windings are often wound with parallel conductors stacked in the radial direction, as shown in Figure 3.
As a result, the position of the magnetic center Mo shifts greatly,
In addition, the position of the magnetic center Mo changes in a complicated manner on one side where there is a transition part of the quadrilateral coil. Therefore, a radial electromagnetic mechanical force is generated in the rectangular plate coil 3 in response to the deviation of the magnetic centers of both the high and low windings. Further, when the low voltage winding is a twin winding consisting of a pair of rectangular plate coils, a radial electromagnetic mechanical force also acts between the pair of coils. However, rectangular plate-shaped coils are more easily deformed by mechanical force in the radial direction than disc-shaped coils, so in conventional structures, measures are not taken to suppress radial deformation of rectangular plate-shaped coils. There was a major drawback.

[Purpose of the invention]

The present invention was made in view of the above-mentioned situation, and
It is an object of the present invention to provide a small and lightweight transformer equipped with alternately arranged rectangular plate-shaped windings that generate a small amount of electromagnetic mechanical force acting in the radial direction.

[Key points of the invention]

According to the present invention, the above-mentioned object is to shift the transition portion provided on the output lead side of the low-voltage winding made of the rectangular plate-shaped twin coils in the winding direction when there is a parallel conductor. The transition portion of the rectangular coil is also placed in contact with the inner circumferential surface of the winding on one side of the rectangular coil, and the filler inserted in the transition portion is formed into a wedge whose maximum thickness in the radial direction is equal to the thickness of the insulated conductor. The coil width on the output lead side is approximately equal to the product of the thickness of the insulated conductor, the number of parallel conductors, and the number of turns of the coil, so as to reduce the radial positional deviation of the magnetic center Mo. This was achieved by

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 4 is a plan view of a rectangular plate-shaped coil for explaining the present invention. In the figure, a rectangular plate-shaped coil 21 has a single insulated conductor 22 at a crossing portion 2.
3 as a starting end and outlet lead 24 as a terminal end, the wire is wound three times in a radial direction so as to overlap. It is guided to the other rectangular plate coil of the pair. Further, the filling 25 inserted to fill the hole formed in the transition part is formed in a wedge shape as shown in the hatch part in the figure.
The conductor 22 is wound approximately one turn with the starting point at 3.
is formed so as to extend outward along the wedge-shaped slope of the stuffing 25 in the a section and to overlap with the outside of the transition section 23. With this configuration, compared to the conventional structure, both the size of the radial deviation of the magnetic center Mo and the circumferential range where the deviation occurs is reduced, and as a result, the radial deviation on the output lead side of the rectangular plate coil is reduced. It is possible to reduce the electromagnetic mechanical force acting on the

FIG. 5 is a plan view of a rectangular plate-shaped coil showing an embodiment of the present invention. The difference from FIG. This is because the plate-shaped coil 31 is formed. In the illustrated example, parallel conductors 32a, 32b, 32
Each transition part 33a, 33b, 33c of c
are arranged at predetermined intervals in the winding direction of the coil, and the transition portions are arranged so as to be in contact with the inner peripheral surface of one side of the rectangular plate-shaped coil. Further, the filling 35 is formed into a wedge shape divided into three parts 35a, 35b, and 35c, and the transition part 33
It is interposed between a, 33b, and 33c. By forming the rectangular plate-shaped coil 31 in this way, the width of the coil on the output lead 34 side is
Thickness t of insulated conductor, number of parallel conductors n, and number of turns N
As a result, the radial deviation of the magnetic center Mo can be minimized, and as a result, the electromagnetic mechanical force acting in the radial direction can be significantly reduced compared to the conventional structure.

Furthermore, by adjusting the number of parallel conductors so that the radial thickness t of the insulated conductor 32 is approximately equal to the thickness of the coated conductor of the high voltage winding, the radial electromagnetic mechanical force acting between both windings can be minimized. It is also possible.

FIG. 6 shows the state of the transition portion of a twin winding consisting of a pair of rectangular plate coils, and the pair of rectangular plate coils 31 and 41 are connected to three parallel conductors 32a, 32b as in FIG. , 32c are wound in a radial overlapping manner and connected in series by transition portions 33a, 33b, and 33c, and a pair of lead leads are drawn out from the outer circumferential side of each coil to form a twin winding.
In FIG. 6, three parallel conductors 32a, 32b,
32c, the conductor 32c is the innermost part of the coil 31, and the conductor 32b and 32a are wound on the outside thereof, but the transition parts 33a, 33b, 33
In the coil 41, the conductor 32a is disposed in the innermost part of the coil 32c.
is formed so that it is the outermost part. In the present invention, since the positions of the transition portions are shifted from each other in the circumferential direction of the coil, there is an advantage that the parallel conductors can be easily disposed at the transition portions.

Further, the padding inserted in the transition part is inserted in the hatched part in the figure, for example, the part where the padding 35b engages with the transition part 33b is cut out diagonally,
It is formed into a wedge shape, thick at this part and thin at the other.
It is adhered to the surface of the insulated conductor using an adhesive or the like.

〔Effect of the invention〕

According to the present invention, as described above, the transition portion of each conductor of a twin winding in which a rectangular plate coil is formed of a plurality of parallel conductors is shifted in the circumferential direction to one side of the rectangular plate coil. The stuffing to be inserted in the transition part is formed and arranged in a wedge shape whose maximum thickness is almost equal to the thickness of the insulated conductor, and the stuffing is divided into multiple pieces corresponding to the number of conductors and inserted in each transition part. By doing so, the coil width was formed so as not to increase. As a result, the deviation of the magnetic center position in the width direction of the rectangular plate coil is significantly reduced, the electromagnetic mechanical force acting in the radial direction of the coil can be minimized, and the dislocation of the conductor in the twin winding became easier.

In addition, because the electromagnetic mechanical force acting in the radial direction is reduced, mechanical reinforcement to prevent radial deformation of the winding wire is unnecessary or simplified, making it possible to create a compact and lightweight alternating coil that takes advantage of the characteristics of the rectangular plate coil. We were able to contribute to providing a transformer with arranged windings.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a transformer having alternately arranged windings, FIGS. 2 and 3 are plan views of a conventional rectangular plate coil, and FIG. 4 is a plan view of a rectangular plate coil showing an embodiment of the present invention. FIG. 5 is a plan view showing a modification of the embodiment of the present invention, and FIG. 6 is a structural diagram of a transition portion in a twin winding. In the figure, 1... Outer iron core, 1a... Main leg, 1c... Insulating tube, 2... High voltage winding, 3... Low voltage winding, 3, 21, 31... Rectangular plate coil, 2
2, 32...Insulated conductor, 32a, 32b, 3
2c...Parallel conductor, 23, 33a, 33b, 33
c... Wataribe, 24, 34... Intercession lead, 2
5,35...Filling, Mo...Magnetic center position, W
...This is the width of the coil.

Claims (1)

[Claims] 1 Low-voltage windings and high-voltage windings, each consisting of a rectangular coil in which an insulated conductor is wound multiple times in a rectangular plate shape and connected in series, are attached to the legs covered with an insulator of an external iron stack core. The low-voltage windings are twin windings that are fitted alternately and have transition portions on the inside of the windings, and the transition portions and the pair of opening portions are on either side of the stacked iron core in the stacking direction. The low-voltage winding is comprised of parallel conductors divided into multiple layers in the winding direction of the rectangular coil, and the transition portion of each parallel conductor is a portion of one side of the rectangular coil on the inner circumference side of the rectangular coil. are arranged at predetermined intervals in the circumferential direction, and the wedge-shaped padding is divided according to the number of parallel conductors, so that the transition portion of each parallel conductor and the padding contact different positions in the circumferential direction of the insulator. A transformer winding characterized in that: