JPH06244038A - Winding structure of transformer - Google Patents

Abstract

PURPOSE:To secure previously no gap between two windings which is used for the insertions of the coils of a transformer, by so forming the two windings as to wind them simultaneously via rolling-in spacers and common spacers. CONSTITUTION:Parallel conductors 1B, 2B are superimposed on each other in the radial direction of the coil of a transformer via rolling-in spacers 3, and are wound in a body spirally via common spacers 4 interposed between the turns of the coil. The rolling-in spacers 3 are insulating pieces and are interposed between stable and low-voltage windings 1, 2 at spaces to the security of the dimension for their insulations. Also, since the common spacers 4 are interposed between the turns in common between the parallel conductors 1B, 2B, the axial lengths of the parallel conductors 1B, 2B are made identical with each other. Further, the axial thickness of the insulating materials included in conductors 1A, 2A are made identical with each other too in the parallel conductors 1B, 2B. Thereby, there is no necessity for the previous security of the gap between the stable and low-voltage windings 1, 2 which is used for the insertions of the coils, and the whole of the transformer can be contracted. Also, since the work for the insertions of the coils is eliminated and the pretreatment for the windings is done only once satisfactorily, the number of manufacturing processes of the windings can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding structure for a transformer in which a low-voltage winding and a stable winding are coaxially and radially opposed to each other.

[0002]

2. Description of the Related Art FIG. 3 is a one-sided sectional view showing a winding structure of a conventional transformer. The stable winding 1 and the low-voltage winding 2 are coaxially wound around a central axis (not shown) that moves up and down the left end of FIG. 3, and are arranged so as to face each other in the radial direction (the left-right direction of FIG. 3). . The stable winding 1 is a conductor 1A with an insulation coating.
Are overlapped in the radial direction and two are arranged in the axial direction, and these eight are spirally wound integrally as the parallel conductor 1B. On the other hand, the low-voltage winding 2 also has eight insulated conductor wires 2A stacked in the radial direction and two in the axial direction.
The 16 pieces are arranged in parallel, and the 16 pieces are arranged as a parallel conductor 2B and are spirally wound integrally with each other through a spacer 41 between the turns. An inter-coil spacer 31 is interposed between the stable winding 1 and the low-voltage winding 2 to fill the gap between the windings. A high voltage winding is further arranged coaxially with the low voltage winding 2, but is not shown.

The stable winding 1 is provided for the purpose of reducing the zero-phase impedance of a star-connected winding in a star-star connection or a star-staggered connection transformer, and is provided in an external circuit. Is a non-connected triangular winding.
A structure in which a plurality of conducting wires are spirally wound in one piece like the stable winding 1 and the low-voltage winding 2 is called a helical coil, and the plurality of conducting wires are connected in parallel at the terminal end of the winding. ing. The helical coil is used for a winding through which a large current flows, and the conductor is dislocated at an intermediate position of the winding. In addition, as the stable winding, a cylindrical coil configured to be wound in the axial direction by a single conductor may be used.

[0004]

However, in the conventional device as described above, it is absolutely necessary to interpose the inter-coil spacer between the windings, which causes a problem that the entire transformer becomes large. That is, two windings that are radially opposed to each other and are coaxially arranged are separately wound on a winding frame, and then coil insertion is performed so that they are coaxially inserted. When inserting the coil, the coil cannot be assembled unless there is a gap for inserting the coil in advance. Therefore, conventionally, the inner diameter of the outer winding is formed larger than the outer diameter of the inner winding by about 5 to 10 mm, and the inter-coil spacer is inserted from the axial direction after inserting the coil. The spacer was used to fill the gap between the windings, and the windings were adjusted to be coaxial with each other. As a result, the outer diameter of the outer winding is increased, and as a result, the iron core, the tank, and the transformer are also enlarged.

An object of the present invention is to eliminate the coil insertion gap and reduce the size of the entire transformer.

[0006]

In order to achieve the above object, according to the present invention, two windings made of a conductor wound coaxially with each other in the axial direction are arranged so as to face each other in the radial direction. A winding structure of a transformer, in which conductors of two windings are overlapped in a radial direction with a winding spacer interposed therebetween, and are spirally integrally wound with a common spacer between turns. To do.

In such a structure, the conductors of the two windings are each made up of a plurality of parallel conductors to form a helical coil, or one of the conductors of the two windings is made of a single conductor. It is assumed that a helical coil is formed by forming a cylindrical coil and the other of the plurality of parallel conductive wires.

[0008]

According to the structure of the present invention, the conductors of the two windings are overlapped with each other in the radial direction via the winding spacers, and are spirally integrally wound between the turns via the common spacer.
The winding spacers ensure the insulation dimension between the windings, and the conductors of the two windings are simultaneously wound to form two windings. Therefore, this structure does not require a coil insertion gap, and the outer diameter of the winding is reduced accordingly.

In such a structure, the two windings can be applied to a transformer having a stable winding and a low-voltage winding by combining helical coils with each other or combining a cylindrical coil and a helical coil.

[0010]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a sectional view of one side of a main part showing a winding structure of a transformer according to an embodiment of the present invention. The parallel conductors 1B and 2B are superposed in the radial direction via the winding spacer 3 and spirally wound integrally via the common spacer 4 between the turns. The other structure is the same as the conventional structure shown in FIG. The same parts are designated by the same reference numerals, and detailed description thereof is omitted.

The winding spacer 3 is an insulating piece, and is interposed in some places in order to secure an insulating dimension between the stable winding 1 and the low-voltage winding 2. Since there is no coil insertion process, no gap is needed between the windings. Since the common spacer 4 is interposed between the turns, the parallel conductors 1B and 2B have the same axial length. This is because the stable winding 1 and the low-voltage winding 2 are finally tightened together from above and below. The axial thickness of the insulating material included in the conductors 1A and 2A is also the same in each parallel conductor. As a result, even if the winding is dried, there is no difference in the thickness of the insulating material between the conductors 1A and 2A, so that the axial lengths of the parallel conductors 1B and 2B do not change at all.

FIG. 2 is a sectional view of one side of a main portion showing a winding structure of a transformer according to a different embodiment of the present invention. The stable winding 10 is a cylindrical coil formed by only one conductor 10A. Other configurations are the same as those in FIG. In this case as well, in order to make the insulation thickness of the parallel conductor 2B and the conductor 10A the same in the axial direction, the thickness of one side insulating coating of the conductor 10A is double that of the conductor 2A.

[0013]

As described above, the present invention is formed by simultaneously winding two windings through the winding spacer and the common spacer. As a result, it is no longer necessary to secure a gap between the windings for inserting the coil in advance, so that the entire transformer is reduced in size and an economic advantage comes out. Further, the coil insertion work is eliminated, and the winding pre-tightening process is performed only once, which reduces the number of winding manufacturing steps.

Further, by combining the two windings with each other or with the combination of the cylindrical coil and the helical coil, it is possible to reduce the size of the entire transformer including the stable winding and the low-voltage winding.

[Brief description of drawings]

FIG. 1 is a side sectional view of a main part of a transformer winding structure according to an embodiment of the present invention.

FIG. 2 is a sectional view of one side of a main part showing a winding structure of a transformer according to another embodiment of the present invention.

FIG. 3 is a sectional view of one side of a main part showing a winding structure of a conventional transformer.

[Explanation of symbols]

1, 10: Stable winding, 2: Low voltage winding, 1A, 2A, 10
A: conducting wire, 1B, 2B: parallel conductor, 3: winding spacer, 4: common spacer

Claims (3)

[Claims] 1. A winding structure of a transformer in which two windings made of conductors that are wound coaxially with each other in the axial direction are arranged to face each other in the radial direction. A winding structure for a transformer, characterized in that the winding structures are arranged in a radial direction with a winding spacer interposed therebetween, and are spirally integrally wound with a common spacer between turns. 2. The winding structure for a transformer according to claim 1, wherein the conductors of the two windings are each composed of a plurality of parallel conductors to form a helical coil. 3. The conductor according to claim 1, wherein one of the conductors of the two windings is made of a single conductor to form a cylindrical coil, and the other is made of a plurality of parallel conductors to form a helical coil. The winding structure of the transformer characterized by the above.