JPS6348409B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a continuous disk winding, and more particularly to a transposed structure of a continuous disk winding often used in core type transformer windings.

[Technical background of the invention]

Various winding methods are selected and applied to the windings used in core type transformers depending on the voltage and current of the windings, but continuous disk windings are particularly easy to work with due to their simple structure. Due to its ease of use and excellent electrical and mechanical properties, it is widely used as a winding wire for a wide range of voltage classes. As the name suggests, continuous disk winding is formed by winding the conductor continuously from the beginning to the end without cutting it in the middle, eliminating the need to connect the conductor midway through the winding. Depends on. As the conductor for the continuous disc winding, one or more rectangular conductors (the most common conductor with a rectangular cross section) may be used in parallel, depending on the required current capacity, or windings with larger currents may be used. For wires, one transposed wire is made by twisting multiple rectangular conductors.
A book or multiple books are used in parallel.

Figure 1a shows the conductor arrangement of a continuous disk winding 1 using two conductors in parallel, and the numbers in the cross-sectional view of the winding A part shown in Figure 1b indicate the winding numbers. a and b indicate two parallel conductors. As is clear from the figure, when passing from one section 2 of the winding to the next section 3 (this is referred to as a crossing), the parallel conductors change their radial positions. In addition, 4 in the figure shows the winding opposite to the winding 1 wound on the iron core leg 5 side.

FIG. 2 is a perspective view of the outer transition section. As can be seen from this figure, the conductors are crossed one by one.
By doing this, the radial dimension d of winding section 2 or 3 (this is called the build)
can be wound without extreme changes from its upper and lower sections. Furthermore, by exchanging the radial positions of the parallel conductors during crossing, the relative distances between each conductor and the opposing winding 4 can be equalized. This equalizes the mutual inductance between each conductor and the opposing windings, making it possible to equalize the shunting of parallel conductors.

The transition takes place on the inside and outside of the winding section, but by adjusting the mutual positions of these according to the number of parallel conductors and the thickness of the conductors, the convexity at the transition section is eliminated, and the inside and outside diameters are almost perfectly round. It is possible to roll it up.

[Problems with background technology]

However, this conventional continuous disk winding method has the following drawbacks. In other words, when there are two parallel conductors, the conductor transposition to the opposing winding is completed by exchanging the radial position of the conductors at each crossing as described above, but when the number of parallel conductors in the section is reduced to three. In this case, the dislocation between the conductors becomes incomplete, causing an imbalance in the shunt between the parallel conductors.
This increases the winding load loss and, in turn, increases the winding temperature. below,
This will be explained.

FIG. 3 shows the arrangement of each conductor in a section in a conventional winding method in which there are three parallel conductors and the number of turns per section is two. In the figure, the radial positions of the parallel conductors are changed for each section, and although their mutual positions with respect to the opposing windings appear to be equal at first glance, there is actually the following problem. That is, since conductors a and c occupy symmetrical positions in each section, transposition is safe, but conductor b is always located between conductors a and c. The fact that conductor b always occupies the middle suggests that the arrangement of each conductor is averaged, and in fact the total length of each conductor is almost the same (that is, the resistance is the same), but the mutual inductance with respect to the opposing winding There is a difference that cannot be ignored. The shunt current of each conductor is determined by the impedance between each conductor and the opposing winding, so even if there is a slight difference in mutual inductance, if the resistance components are the same, there may not be much unbalance in the shunt current. In particular, as the transformer becomes larger in capacity, the core becomes thicker, the number of windings decreases, and the ratio of resistance to inductance becomes smaller, resulting in extreme imbalance.

This shunt imbalance increases load loss and increases winding temperature, deteriorating transformer characteristics, and in extreme cases can cause winding burnout, so it must be avoided at all costs.

[Purpose of the invention]

In view of the above points, it is an object of the present invention to provide an improved continuous disk winding in which the shunt current is equal even when there are three parallel conductors in a section.

[Summary of the invention]

In order to achieve this objective, the present invention combines two adjacent conductors among the three parallel conductors constituting the continuous disk winding into one set, and swaps the positions in the radial direction with the remaining one conductor. The conductor is characterized in that the transposition is performed by passing between the sections, so that the proportion of the position occupied by each conductor in the radial direction is equal as a whole.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the drawings.

Figure 4 shows the arrangement of each conductor in a continuous disk winding according to an embodiment of the present invention.The general crossing is the same as in the conventional method, but from the beginning of winding to 1/3 and 2/3
A new crossing method is used at the transition between sections corresponding to . In other words, two of the three conductors are crossed at this point, and the radial position is not swapped here, but the position is swapped with the remaining one. be. By using such a crossing method, the conductor that was previously located in the middle will be moved to the rear after crossing, and conversely, one of the conductors that was located at the end will be located in the center.

Therefore, by making this new transition at 1/3 and 2/3 from the beginning of the winding, each conductor can be made to occupy a middle position in each of the 1/3 of the winding. If the sections occupying the middle become equal, between the general sections, the conductors at both ends will be arranged completely symmetrically with the conventional crossing, so in the end, the positions occupied by each conductor will be equal over the entire length of the winding, Therefore, the rearrangement will be completed and the current will be divided correctly.

In addition, in the above explanation, new dislocations are limited to 1/3 and 2/3, but as a rough guide, it is sufficient to set the new dislocations to approximately 1/3 and approximately 2/3, and it is not necessary to be particular about the position. It is obvious that this new crossing can be made several times so that the sections occupying the middle positions of each conductor as a whole are approximately 1/3 each. Also, by crossing two wires at the same time, the difference in radial dimension between the upper and lower sections becomes larger than in the conventional method, but this can be done without any problem by adjusting the position of the transition between the inside and outside and inserting an insulating filler.

〔Effect of the invention〕

As described above, according to the present invention, even when there are three parallel conductors in a section, a continuous disk winding can be obtained in which the branch currents of each conductor are equal. As a result, a compact transformer with low loss and a small cooling device etc. can be obtained.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the conductor arrangement of a continuous disc winding composed of two parallel conductors, where a is a cross-sectional perspective view, and b
is an enlarged view of part A, Figure 2 is a perspective view showing conductor replacement at the outer transition section, Figure 3 is a conductor arrangement diagram of a conventional continuous disk winding composed of three parallel conductors, and Figure 4. 1 is a conductor layout diagram of a continuous disc winding wire, which is an embodiment of the present invention, and is constructed of three parallel conductors. 1... Continuous disk winding, 2, 3... Winding section, 4... Opposing winding, 5... Iron core leg.

Claims (1)

[Claims] 1. In a continuous disk winding formed by continuously winding three parallel conductors while symmetrically changing their radial positions between sections and transposing them, the above-mentioned conductors are formed between at least two sections. By using two adjacent conductors among the three parallel conductors as one set and replacing the radial position with the remaining one conductor and passing between the sections,
A continuous disk winding characterized by an averaged radial arrangement of conductors.