JPH0534091Y2 - - Google Patents

Description

[Detailed explanation of the idea] A. Industrial application field The present invention relates to a rectifier transformer.

B. Summary of the invention The present invention is a rectifier transformer having a winding wire connected with △ and a winding wire connected with wires, in which either one of the windings is divided into two to form a pair of divided windings, By arranging the pair of split windings on both sides of the other winding with the other winding in between, and further connecting the pair of windings in series, the method is limited to a winding method. Instead, the optimum winding configuration can be obtained in consideration of the capacity and voltage of each winding.

C. Prior Art In transformers for rectifiers, the number of phases is generally increased in order to suppress harmonics, and in order to shift the phase on the secondary side of the transformer, △
Connections and combinations of connections are being made. In this case, since reducing the capacity of a single transformer reduces efficiency, it is often required to divide the secondary side of a single transformer into △ connection and connection. , it is necessary to match characteristics such as impedance with the primary winding, the Δ-connection winding, and the Δ-connection winding.

Figures 2 to 4 show conventional transformers in which the secondary side is divided into △ connection and connection.
In the figure, 1 is the iron core, 2 is the primary winding, and 3 is the 2
In the secondary winding, the △ connected winding 3a of the secondary winding
The winding 3b connected to the primary winding 3b is divided into upper and lower parts in the axial direction, and the primary winding 2 is also divided into two upper and lower windings 2a and 2b, which are connected in parallel.
4a and 4b are leads of the secondary windings 3a and 3b.

Figure 3 shows that the △-connected secondary winding is divided into two to form upper and lower axial windings 5a and 5b, and the λ-connected winding is also divided into two to form upper and lower axial windings. The wires 6a, 6b are formed, and these four windings 5a, 5b, 6a, 6b are connected to the winding 5 of the △ connection.
A, 5b and the connected windings 6a, 6b are arranged diagonally. It intersects with the lead 8 to be connected. 9 is the iron core.

In FIG. 4, a Δ-connection winding 11a and a Δ-connection winding 11b are arranged on both sides of the primary winding 10 with the primary winding 10 in between. 12
is an iron core.

D. Problems to be Solved by the Invention The conventional transformers mentioned above all have the drawback of being limited in the winding method, and in addition, taking disk winding as an example, there are the following problems.

When the secondary winding of the △ connection and the connection is divided into two axially upper and lower parts as shown in Figure 2: The primary winding must be divided into two axially upper and lower parts and connected in parallel, especially for tap coils. If the tap is a separate winding, the tap must also be divided into two, which reduces the space factor within the winding.

A space is required for drawing out the leads 4a, 4b of the secondary winding, and therefore the radial dimension increases.

The impedance between the primary winding 3 and the secondary windings 3a and 3b increases, resulting in large steel loss.

The ampere turns of the △ and λ connections are the same, but the number of turns differs by a factor of √3, so the space factor of each winding is different, and therefore a margin is required to make the width of the windings equal. .

As shown in FIG. 3, when the secondary winding is divided into four parts and arranged diagonally: The number of man-hours for arranging them diagonally increases. Further, when the voltage of the secondary winding is high, insulation measures are required, and when the voltage of the secondary winding is low and the current is large, a lead connection is required.

Same as above) When the secondary winding is placed on both sides of the primary winding as shown in Figure 4: The space factor decreases because main insulation is required at two locations. do.

In order to match the impedance characteristics of the primary and secondary windings, it becomes necessary to unnecessarily increase the radial main insulation dimension for the inner windings, which have a small average length.

A space is required for tapping out the primary winding, and the number of man-hours for this also increases.

The present invention was made to solve these problems, and an object of the present invention is to provide a rectifier transformer that is not limited to the winding method.

E Means for Solving Problems In order to achieve the above object, the present invention divides either the △ connection or the windings to be connected into two to form a pair of divided windings, and divides the pair of divided windings into two. The windings are arranged on both sides of the other winding with the other winding in between, and the pair of windings are connected in series.

F Effect: Since the Δ-connected and connected windings are arranged in three rows, the leads only appear above and below the windings, and an optimal winding configuration can be achieved.

G. Embodiments The present invention will be described below based on embodiments shown in the drawings. As shown in FIG. 1, the windings 20a, 20b to be connected are divided into two in the radial direction, and the windings 21 to be connected are provided. A Y-connected winding 21 is arranged in the radial direction between them.

Although the figure shows an example in which the winding that is connected △ many times is divided into two, the winding 21 that is connected is not limited to this, and the winding that is connected △ is divided into two and the winding that is connected △ is It may be placed between them and on both sides.

In this way, if either the △ connection or the winding to be connected is divided into two and the other winding is placed between them, the two divided windings (20a and 20b in the figure) Connect the bottom end with a connector.

By the way, the ratio of the number of times the winding is divided into two is set to 1:1. However, it is not necessarily limited to this ratio, and is necessary in order to match the characteristics such as impedance of the primary winding 22 and each of the windings 20a, 20b to be connected △ and the winding 21 to be connected. Depending on 1:
It is also possible to shift the ratio within a range of about 10% from the ratio of 1.

Note that the heights of the three windings 20a, 20b, and 21 are preferably set to be equal to each other.

23 in the figure is an iron core.

H. Effects of the invention As explained above, in this invention, either the △ connection or the winding to be connected is divided into two and placed on both sides of the other winding, so the following effects can be obtained. It will be done.

If only the upper and lower ends are opened, and the heights of the windings are made equal as in the example, the optimum winding form can be adopted in terms of the capacity and voltage of each winding without being restricted by the winding method. be able to.

The main insulation in the radial direction only needs to be in one place, so
The space factor improves.

Since there is a degree of freedom in allocating the number of times regardless of the insulation distance, it is easy to match characteristics such as impedance between the primary winding and the secondary winding.

Even if the coil width of the winding changes, no problems occur in terms of characteristics.

There is no need to divide the primary winding, and together with the above, the space factor is further improved.

Whether in the case of no-voltage or tap switching under load, tap withdrawal is as easy as with a general transformer.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a rectifier transformer according to the present invention, and FIGS. 2 to 4 are schematic diagrams of conventional transformers. 20a, 20b...△Winding wires to be connected, 21...
...Winding wire to be wired.

Claims (1)

[Claims for Utility Model Registration] In a rectifier transformer having a delta-connected secondary winding and a star-connected secondary winding, either one of the secondary windings is connected in the radial direction. It is divided into two to form a pair of divided windings, the other winding is arranged in the radial direction between the pair of divided windings, each lead of the pair of divided windings is pulled out from the upper end, and the lead of each of the pair of divided windings is pulled out from the upper end. A rectifier transformer characterized in that the lower ends of the divided windings are connected by a connecting body.