JPH0754982Y2 - Winding structure of static induction - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention relates to a static induction electric device such as a transformer or a reactor,
Especially, this winding structure is concerned.

[Conventional technology]

FIG. 3 is a layout diagram of conventional windings of a static induction electric generator. The windings include an iron core 1 and two windings each of which has an insulating coating.
A cylindrical winding 2 formed by stacking two conductors 2A, 2B in a radial direction on a core 1 in a solenoidal manner, and dislocations that switch the inner and outer diameter sides of the conductors 2A, 2B are cylindrical windings. This is performed in the central portion 3 of the wire 2, and both ends 4A and 4B of the conductors 2A and 2B are connected in parallel.

Generally, since the conductors in the parallel winding do not have exactly the same diameter when wound, the amount of leakage flux intersecting each conductor is different. Therefore, the voltages induced in the respective conductors are different, and the unbalanced current flows as a circulating current in the parallel windings, resulting in loss. In order to reduce such an unbalanced current, the parallel windings are transposed so that the amount of leakage magnetic flux intersecting is the same. In FIG. 3, since the dislocation has occurred in the central portion 3 of the cylindrical winding 2, the conductors 2A and 2B are wound with the same diameter, and the lengths in the axial direction are exactly the same. Therefore, the amount of magnetic flux intersecting each of the conductors 2A and 2B is the same, so that generation of an unbalanced current is suppressed.

Further, FIG. 4 is a connection layout diagram of different windings in the conventional static induction electric generator. In this winding, an iron core 1 and two conductive wires each having an insulating coating are laminated in a radial direction on the iron core 1 in a solenoid shape. And a cylindrical winding 5 formed by winding the inner cylindrical winding 5 and an outer cylindrical winding 7 arranged so as to face each other in the radial direction. The inner wire side and outer wire side of the cylindrical winding 5 are transposed so that the inner diameter side and the outer diameter side of the conductor wire are exchanged with each other. Each of the conductors forming the wire 7 is connected in parallel, and the other end of the cylindrical winding 5 is provided with a transition portion 10 that connects the inner cylindrical winding 6 and the outer cylindrical winding 7 in series. In this case as well, since the dislocation is performed in the central portion 8 of the cylindrical winding 5, the inner cylindrical winding 6 and the outer cylindrical winding 7 are wound on the inner diameter side of the conductor and on the outer diameter side. Since the length of winding is exactly the same and the amount of magnetic flux intersecting each of the two conductors is the same, the generation of unbalanced current is suppressed.

[Problems to be solved by the device]

However, the conventional winding structure as described above has a drawback that the winding is extremely weak against the electromagnetic mechanical force generated by the short-circuit current of an accident because the position where the conducting wire is displaced is at the center of the winding. It was

Generally, when a short-circuit current I flows through the winding, the mechanical force F received by the winding can be expressed by F∝B · I (1). Here, B is the leakage magnetic flux density of each part of the winding caused by the short circuit current. FIG. 5 is a cross-sectional view showing a leakage magnetic flux distribution for an example of a transformer,
Two windings 11A, 11B wound around the iron core 1 and facing each other in the radial direction
The leakage flux 12 is shown when a short circuit current flows in the.
Since the short-circuit current flows in the opposite directions in the windings 11A and 11B, the electromagnetic mechanical force F is generated in a direction in which the electromagnetic mechanical forces F repel each other in the radial direction. Generally, the leakage magnetic flux density in the central portion of the winding is the largest, and the leakage magnetic flux density becomes smaller as it approaches the upper and lower ends of the winding. Therefore, the electromagnetic mechanical force F in the central portion of the winding becomes the largest, and the mechanical strength of the winding itself is determined by the proof stress in the central portion.

In the conventional winding structure, the dislocations were performed at the central portions 3 and 8 of the windings.Therefore, the wires that were overlapped and wound at this dislocation part were twisted and bent, and the wires on the inner diameter side were external. The conductor on the outer diameter side was deformed so as to move to the diametric side, and the conductor wire on the outer diameter side was deformed so as to move to the inner diameter side. In this way, the portion subjected to large bending deformation inevitably decreases the proof stress against the mechanical force applied from the outside, so in order to secure the mechanical proof strength of the dislocation part, a thicker wire than necessary should be used. It may be used for winding.

It is an object of the present invention to provide a winding structure that is strong against electromagnetic mechanical force by avoiding a dislocation position from the center of the winding.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, according to the present invention, two cylindrical windings, which are formed by overlapping two conductive wires, each of which has an insulating coating, in a radial direction and winding the core wire in one iron core leg, are arranged in a radial direction. The inner cylindrical winding and the outer cylindrical winding that are arranged so as to face each other. At one end of the two cylindrical windings, each of the two conductive wires forming each of the cylindrical windings is connected to each of the cylindrical windings. Wires are connected in parallel in the wire, and at the other end of the two cylindrical windings, there is provided a crossover portion for mutually connecting the respective cylindrical windings and the other cylindrical winding, and at the crossover portion, either one of the cylindrical windings is wound. It is assumed that the inner diameter side and the outer diameter side of the two conductive wires forming the wire are interchanged and dislocated.

[Action]

According to the structure of the present invention, each of the two insulated
Two cylindrical windings, which are formed by stacking a plurality of conductive wires in a radial direction and winding them around one iron core leg, are composed of an inner cylindrical winding and an outer cylindrical winding that are arranged so as to face each other in the radial direction. , At the one end of the two cylindrical windings, each of the two conducting wires forming the respective cylindrical windings is connected in parallel in the respective cylindrical windings, and at the other end of the two cylindrical windings, the respective cylindrical windings are connected. In the case where the crossover portion for connecting the winding wire and the other cylindrical winding wire to each other is provided, since the two conductor wires are dislocated in the crossover portion, the amount of magnetic flux intersecting with each of the two conductor wires. Are almost the same, and the dislocation position is avoided from the central part of the winding, and the winding end has the smallest electromagnetic mechanical force, resulting in a mechanically tough winding structure.

〔Example〕

 The present invention will be described below based on embodiments.

FIG. 1 is a connection layout diagram showing windings of a static induction electric generator according to a reference example of the present invention. The windings are composed of an iron core 1 and two conductive wires 20A and 20B, each of which is insulated and coated in a radial direction. A cylindrical winding 20 is formed by winding the iron core 1 in a solenoid shape, and both ends 40A, 40B of the conductors 20A, 20B are connected in parallel. The dislocation of the conducting wire is caused by the axial length l of the cylindrical winding 20 from both ends 40A, 40B of the conducting wire 20A, 20B.
This is done at positions 30A and 30B, which are about one-fourth of the positions on the cylindrical winding side.

In the figure, since the two conductors 20A and 20B are wound with the same diameter and have the same axial length, the amount of magnetic flux intersecting each of the windings 20A and 20B is the same and the unbalanced current is Does not happen. Moreover, since the position where the dislocation is carried out is avoided from the central portion of the winding, the winding structure has a stronger electromagnetic mechanical force than the conventional structure.

FIG. 2 is a wiring arrangement diagram showing windings of a static induction electric generator according to an embodiment of the present invention. The windings are composed of an iron core 1 and two conductive wires each of which is insulated and coated in a radial direction on the iron core 1. And a cylindrical winding 50 formed by winding in a solenoid shape. The cylindrical winding 50 includes an inner cylindrical winding 60 and an outer cylindrical winding 70 which are arranged to face each other in the radial direction.
, The conductor wire forming the inner cylindrical winding 60 and the conductor wire forming the outer cylindrical winding 70 are connected in parallel at one end 90, and the inner cylindrical winding is formed at the other end of the cylindrical winding 50. A crossover connecting the wire 60 and the outer cylindrical winding 70 in series
100 is equipped. The dislocation of the conducting wire is performed at a position following the connecting portion 100 at the end of the cylindrical winding.

In the figure, the conductor wire arranged on the inner diameter side in the inner cylindrical winding 60 moves to the outer diameter side after crossing the outer cylindrical winding 70,
On the other hand, the conductor wire arranged on the outer diameter side in the inner cylindrical winding 60 crosses the outer cylindrical winding 70 and then moves to the inner diameter side.
The two conductors in this case do not have exactly the same length in the axial direction wound with the same diameter, but the unbalanced current generated in the conductors was calculated to be about 5% or less of the rated current. It turned out to be small and within the margin of error. In Fig. 2, assuming that dislocation does not occur at position 50A at the end of the cylindrical winding, judging from the fact that an unbalanced current that is as large as 50% of the rated current will occur, the effect of dislocation at position 50A is very large. I understand. Further, since the dislocation is performed at the winding end portion where the electromagnetic mechanical force generated is the smallest, the mechanical resistance of the winding becomes very strong.

[Effect of device]

As mentioned above, this device has two insulating coatings.
Two cylindrical windings, which are formed by stacking a plurality of conductive wires in a radial direction and winding them around one iron core leg, are composed of an inner cylindrical winding and an outer cylindrical winding that are arranged so as to face each other in the radial direction. , At the one end of the two cylindrical windings, each of the two conducting wires forming the respective cylindrical windings is connected in parallel in the respective cylindrical windings, and at the other end of the two cylindrical windings, the respective cylindrical windings are connected. In the case where the crossover portion that connects the winding wire and the other cylindrical winding wire to each other is provided, since two conductors are transposed at the crossover portion, the transposition is performed at the central portion in the conventional winding wire. Although it has a drawback of low mechanical strength, it is possible to provide a winding structure that is very strong against electromagnetic mechanical force.

[Brief description of drawings]

FIG. 1 is a wiring layout diagram showing a reference example of the present invention, FIG. 2 is a winding wiring layout diagram showing an embodiment of the present invention, and FIG.
FIG. 4 and FIG. 4 are conventional wiring connection layout diagrams, and FIG. 5 is a sectional view showing the leakage flux distribution of the transformer. 1: Iron core, 2, 5, 20, 50: Cylindrical winding, 2A, 2B, 20A, 20B: Conductor wire, 3,
8: central part, 4A, 4B, 40A, 40B: end part, 6, 60: inner cylindrical winding,
7,70: Outer cylindrical winding, 9,90: One end, 10,100: Crossover part, 11
A, 11B: winding, 12: leakage flux.

Claims (1)

[Scope of utility model registration request] 1. An inner side in which two cylindrical windings, each of which is formed by overlapping two conductive wires, each of which has an insulating coating, in a radial direction and winding the core wire around one iron core leg, are arranged to face each other in a radial direction. A cylindrical winding and an outer cylindrical winding, and at each one end of the two cylindrical windings, two conductors forming the respective cylindrical windings are connected in parallel in the respective cylindrical windings, At the other end of the two cylindrical windings, there is provided a connecting portion that connects the respective cylindrical windings and the other cylindrical winding to each other.
A winding structure of a static induction electric machine, wherein the inner diameter side and the outer diameter side of two conductor wires constituting either one of the cylindrical windings in the crossover portion are interchanged and displaced.