JP2004319766A - Dry type transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized dry type transformer capable of reducing an installation area to be equivalent to a coil area for one phase and minimizing the dimension of a device / board by constituting phases of core and coil blocks in vertical directions. <P>SOLUTION: For the dry type transformer, a block composed of a laminated core and a primary coil and a secondary coil wound around it is arranged in three phases, and in order to make the lamination direction of the core of the block perpendicular to the vertical direction, arrangement is executed on the same projection surface, and the respective blocks are vertically stacked. Also, the primary coils can be divided and arranged in a zigzag form. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dry-type transformer used in a high-voltage inverter device for controlling a high-voltage motor by serially multiplexing low-voltage three-phase input single-phase output PWM control type inverters.
[0002]
[Prior art]
FIG. 5 shows a conventional dry-type transformer. In the figure, 1 is a primary coil, 2 is a secondary coil, and 3 is a core. Usually, in order to efficiently release the Joule heat generated in the primary and secondary coils, the coils are often oriented vertically and each phase is arranged horizontally. In addition, there is a coil horizontal type shown in FIG. 6 for the purpose of effective use of the electric room space. Further, as shown in FIG. 7, each phase coil block is divided to promote cooling of a primary or secondary coil in contact with an internal core. (For example, see Patent Document 1)
[0003]
[Patent Document 1]
JP-A-6-89817
In each method, the coils of each phase are arranged so as to be in contact with the floor surface, the height direction of the transformer is restricted, and space is saved by mounting a plurality of transformers vertically. At this time, by installing transformer terminals on the left and right or front and back of the housed cabinet, it is possible to improve wiring workability by separating the wiring position of the input and output sections. providing.
In FIG. 7, the block of the primary coil 1 is divided into two parts to promote the release of heat generated inside the coil, and the secondary coil 2 located inside the coil also comes into contact with air.
[0005]
[Problems to be solved by the invention]
However, in the above transformer, either the width or the depth is wider than that of a normal transformer, and the installation size of the storage board (cabinet) on the floor surface is required to be larger than that of the conventional structure, and the installation area is reduced in space. Cannot be realized. In addition, in this method, when multiple transformers are housed in a cabinet, installation space may be reduced overall.However, medium- and large-capacity transformers rarely use multiple transformers, which limits the application. was there.
Furthermore, regarding the position and arrangement of the input / output terminal blocks, some of them are always arranged in the depth direction of the cabinet, and when performing maintenance from the front side of the panel after product delivery, wiring workability is not necessarily good. I can not say.
Also, the transformer shown in FIG. 7 is obtained by dividing the primary coil wound around the outside into two parts. If the heat generated by the coil itself is large, a heat radiation state shown by an arrow in FIG. Cannot be maximized. For this reason, the coil temperature cannot be reduced, and it is difficult to greatly reduce the size of the transformer.
Accordingly, the present invention has been made to solve the conventional problems, and has as its object to provide a small-sized dry-type transformer.
[0006]
[Means for Solving the Problems]
To solve the above problem, the present invention is configured as follows.
(1) In a dry-type transformer in which a block composed of a laminated core and a primary coil and a secondary coil wound around the core are arranged in three phases, the lamination direction of the core of the block is perpendicular to the vertical direction. Each block is arranged vertically on the same projection plane.
As a result, the installation area is close to one coil, and a significant reduction is possible.
(2) The primary coils are arranged in a staggered manner.
As a result, the primary coil is always exposed to the outside air, and the heat generated inside the primary coil is structured to generate uniform convection over the entire surface of the coil by natural convection. Can be released.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a front view of a transformer showing a first embodiment of the present invention, and FIG. 2 is a side view thereof.
In the figure, 1 is a primary coil, 2 is a secondary coil, 3 is a core, 4 is a frame that also serves to fix the core, 5 is a primary terminal, and 6 is a secondary terminal.
The primary coil 1, the secondary coil 2, the primary terminal 5, and the secondary terminal 6 are divided into first, second, and third phases, respectively. The secondary coil 2 of each phase is wound on the primary coil 1a, 1b, 1c divided into three phases. A secondary terminal 6 is provided in a part thereof.
As shown in FIGS. 1 and 2, the core, primary and secondary coils of each phase are oriented laterally with respect to the installation surface, and the blocks of each phase are arranged vertically.
The installation area can be reduced to a value corresponding to the coil area of one phase, and the size of the device / panel can be minimized.
(2 Examples)
FIG. 3 is a sectional view showing a second embodiment of the present invention. FIG. 4 shows heat radiation convection of the primary coil 1.
Since the primary coil 1 in contact with the core 3 is divided into a plurality of staggered structures, the primary coil 1 is always exposed to the outside air, and the heat generated inside the primary coil 1 is naturally generated as shown by the arrow in FIG. By the convection, uniform convection is generated on the entire surface of the coil, and the heat inside the coil can be efficiently radiated.
[0008]
【The invention's effect】
As described above, in the transformer of the present invention, the phase of the core and the coil block is configured in the vertical direction, so that the installation area can be reduced to the coil area for one phase, and the size of the device / panel can be reduced. The effect is that it can be minimized.
According to the second aspect of the present invention, the ventilation in the coil is promoted by natural convection or forced air cooling to improve the cooling effect, so that it is possible to place the coil having a large amount of generated heat horizontally. .
[Brief description of the drawings]
FIG. 1 is a front view of a dry-type transformer showing a first embodiment of the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is a cross-sectional view (a cross-sectional view along AA in FIG. 1) of a dry-type transformer showing a second embodiment of the present invention.
FIG. 4 is an enlarged sectional view showing a primary coil heat radiation structure and a heat radiation path in a second embodiment of the present invention.
FIG. 5 is a perspective view showing a conventional transformer.
FIG. 6 is a diagram showing a conventional transformer, and is a perspective view of the transformer in a case where a plurality of stacked transformers are used.
FIG. 7 is a diagram showing a conventional transformer, and is a perspective view of a transformer in which a primary coil wound outside the transformer is divided into two parts.
FIG. 8 is a cross-sectional view showing a heat dissipation path of a conventional transformer.
[Explanation of symbols]
1 Primary coil 1a Primary coil (first phase)
1b Primary coil (second phase)
1c Primary coil (3rd phase)
2 Secondary coil 3 Core 4 Frame 5 Primary terminal 6 Secondary terminal

Claims (2)

In a dry type transformer in which blocks composed of a laminated core and a primary coil and a secondary coil wound around the core are arranged in three phases, the lamination direction of the cores of the blocks is perpendicular to the vertical direction, and each block is A dry type transformer characterized by stacking vertically. 2. The dry transformer according to claim 1, wherein the coils are arranged in a staggered pattern.

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