JPS6022490B2 - electromagnetic induction winding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic induction winding in which a plurality of windings are arranged in the winding axis direction and are connected in parallel.

FIG. 1 shows a conventional electromagnetic induction winding.

In FIG. 1, 1 is an iron core, 2 is a high-voltage winding, and 3 is a low-voltage winding, four of which are arranged in parallel and connected in parallel, and are composed of sheet-like conductors 3a to 3d. U and V are high voltage winding terminals, and u and v are low voltage winding terminals. In such a configuration, each winding 3a, 3b, 3c of the low voltage winding 3
, 3d are not uniform as shown in FIG.

That is, a large current flows through the windings 3a and 3d at both ends, and a large current flows through the windings 3b and 3c at both ends.
A current of 4 times smaller than that flows. This is each winding 3a, 3b
, 3c, and 3d differ depending on the position where they are placed.

That is, the windings 3a and 3d at both ends have a small impedance, and the windings 3b and 3c at the center have a large impedance. Therefore, compared to the case where the current sharing among the windings is uniform, the generated loss is larger, and the winding with a large current sharing has a higher temperature rise value, and there is also a risk of local heating. In order to improve this inconvenience, a method is sometimes adopted in which a current limiting reactor or compensation wire is connected to both end windings to reduce the impedance difference between the windings and equalize the current sharing. In the case of these methods, current also flows through the current limiting reactor and the compensation wire shaft, so the overall loss generated by the winding and the current limiting reactor or compensation wire shaft is not reduced. The disadvantage is that the manufacturing cost is high because additional wires must be manufactured in addition to the windings.

The present invention has been made to improve the above-mentioned drawbacks, and by displacing the conductor in the winding direction between adjacent windings in the middle of winding, the current distribution between the windings is made uniform. The present invention provides electromagnetic induction windings that are

An embodiment of the present invention will be described with reference to FIG.

In the figure, 1 and 2 are the same as subordinates. Reference numerals 4a to 4d denote first and second windings arranged in parallel in the ball direction and configured by overlapping sheet-like conductors, and constitute the low voltage winding 4.

Among the windings 4a to 4d, the first winding 4a disposed at the end and the second winding 4b disposed adjacent to the first winding 4a have a predetermined number of turns from the beginning of winding. After being wound in layers, they are mutually shifted to the other position in the direction of the ball. That is, the positions of the first winding 4a and the second winding 4b in the wisterial direction are switched during the winding. In addition, the first winding 4d disposed at the end of the pond and the second winding 4c adjacent to the first winding 4d in the direction of winding are also in the middle of winding, similar to the two windings 4a and 4d. Their positions have been swapped. In this way, if the transposition is performed between the windings 4a and 4b, 4c and 4d that are adjacent to each other in the cross direction, the impedance of each winding becomes almost the same, and the current sharing between the windings is made equal as shown in Fig. 4. be done.

Fig. 3 shows an example in which the number of parallel windings in the koji direction is four, but if the number of parallel windings in the axial direction is three, as shown in Fig. 5, by performing transposition, the first winding The current sharing among the wires 4e, 4g and the second winding 4f can be made uniform.

In addition, when the number of parallel windings in the horizontal direction is five or more, as shown in Figure 6, even if only two to three windings at the upper and lower ends are transposed, the current distribution between the windings is almost uniform. You can expect a positive effect.

As described above, according to the present invention, among the plurality of windings arranged in parallel and connected in parallel, the first winding is rearranged at the end in the cross direction, and the first winding is adjacent to the first winding. By transposing the windings 2 and 2, it is possible to equalize the fin flow share of each winding without using parts such as current limiting reactors.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional electromagnetic induction winding, FIG. 2 is an explanatory diagram showing a current distribution diagram of the low voltage winding shown in FIG. 1, and FIG. 3 is a sectional view showing an embodiment of the present invention. FIG. 4 is an explanatory diagram showing current sharing in the low voltage winding shown in FIG. 3. FIGS. 5 and 6 are cross-sectional views showing other embodiments of the present invention. In the figure, 4a, 4d, 4e, 4g are the first windings,
4b, 4c, and 4f are second windings. Note that the same reference numerals in each figure indicate the same or corresponding parts. 1st
Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1 In a case where a plurality of windings in which a sheet-like conductor is wound multiple times are arranged in parallel in the axial direction and connected in parallel, the first winding arranged at the end in the axial direction of each of the above windings and An electromagnetic induction winding characterized in that the first winding and a second winding adjacent to each other are transposed such that their axial positions are reversed in the middle of winding.