JPH0434910A - Assembled type transformer - Google Patents

Abstract

PURPOSE:To reduce a space for installing an assembled type transformer having an iron core surrounding the outer circumference of a disc-like winding body of a unit transformer by tapering joint portions situated corresponding to both coaxial sides of the winding body. CONSTITUTION:Of an iron core 5 formed by pressure molding of mixture of magnetic powder and resin, two portions, one being in contact with the inner circumference of the winding body 1 and the other with the outer circumference thereof, correspond to feet 5a of the iron core, respectively, and the two portions being in contact with the upper and lower surfaces, or both coaxial sides, of the winding correspond to joint portions 5b of the iron core, respectively. Further, these joints 5b are both tapered so that their total wall thickness becomes thinner radially from the center of the iron core to the outer circumference thereof. On both tapered surfaces of these joint portions 5b a pair of primary side lead terminal through holes 8 and a pair of secondary side lead terminal through holes 9 are prepared for connecting the lead wires that are drawn from the primary winding 3 and secondary winding 2 and that pass through the inside of the iron core 5.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a disc-shaped winding body and an iron core formed of magnetic powder so as to cover the outer periphery of the winding body. This invention relates to a collective transformer that obtains the required capacity by connecting a plurality of unit transformers in combination.

(Prior Art) In buildings, etc., there is a demand for downsizing of power receiving and transforming equipment from the viewpoint of effective use of space. The demand for smaller transformers, which are the main equipment in these systems, is becoming stronger year by year, and one of the measures to meet these demands is to make transformers thinner.
A thin transformer has been devised in which the outer periphery of a disc-shaped winding body is covered with an iron core made of a spirally wound copper strip. Since these transformers cannot have much larger individual capacity than ordinary transformers, a plurality of these transformers are arranged in a group in a metal box or the like to supply the required power.

(Problem to be Solved by the Invention) When a plurality of such disc-shaped unit transformers are arranged in a group, they are generally stacked, but in this case, a certain distance between each unit transformer is required due to the need for cooling. It is necessary to create a space, and it also requires a space for wiring to connect between the lead wire outlet of the winding body and the bus bar, which has the disadvantage that the installation space reduction effect cannot be achieved as much as expected. Ta.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a collective transformer that can reduce the cooling space without impeding the cooling effect, can use the cooling space as a wiring base, and can achieve a high overall space saving effect.

[Configuration of the Invention (Means for Solving the Problem) The collective transformer according to the present invention includes a disc-shaped winding body formed by concentrically wound wires and a shape formed to cover the outer periphery of this winding body. Each unit transformer includes a plurality of unit transformers each having an iron core made of magnetic powder, and each unit transformer has a leg portion of the iron core and a joint portion, the portion of which becomes the joint portion, with the wall thickness extending from the center toward the outer periphery. It is characterized in that it is formed into a tapered shape with a thinner wall according to the above, and an outlet terminal is provided in the tapered portion, and the winding bodies of adjacent unit transformers are connected using this outlet terminal.

(Function) In this unit transformer, the joints of the iron core that correspond to both axial sides of the winding body are tapered, so when these unit transformers are stacked, the tapered joints of the adjacent unit transformers will overlap. A space that spreads outward from the center is formed between the sections, and active convection occurs in this space for effective cooling, and connections between the output terminals of the winding body are established in this space. Alternatively, wiring processing is performed for connection to the bus bar.

(Example) Each embodiment of the present invention will be described below.

First, the first embodiment will be explained with reference to FIGS. 1 to 6. As shown in FIG. and a disk-shaped primary winding 3 wound concentrically. An iron core 5 is formed around the outer periphery of such a disc-shaped winding body 1 so as to cover it with an insulator 4 interposed therebetween. This iron core 5 is formed by pressure molding a mixture of magnetic powder and resin, and by this molding, a central through hole 6 and engaging recesses 7 are simultaneously formed in two places around the central through hole 6. Ru. Now, in this iron core 5, the portions adjacent to the inner and outer peripheries of the winding body 1 correspond to the so-called leg portions 5a of the iron core, and the portions adjacent to the upper and lower surfaces of the winding body 1, that is, both axial side surfaces, are joints. Part 5b
This joint portion 5b is formed in a tapered shape whose wall thickness becomes thinner from the center toward the outer periphery. A pair of primary side outlet terminals 8 to which lead wires led out from the secondary winding 3 and the secondary winding 2 and penetrating inside the iron core 5 are connected to both sides (upper and lower surfaces in the figure) of the tapered joint 5b.
and a pair of secondary side outlet terminals 9 are provided.

Here, the wall thickness d at each point of the joint portion 5b must be such that the magnetic flux density in the cross-sectional area S at each point does not exceed the designed maximum magnetic flux density, and this condition is expressed by the following equation.

d≧S/2π・(R+x) Here, R is the distance from the center Pl of the iron core 5 to the starting point P2 of the tapered part of the joint 5b, and X is the distance between P2 and any one of the above points. It is distance.

As shown in FIG. 3, a plurality of unit transformers 10 configured in this manner can be stacked to meet the required capacity, with vibration isolating members 11 interposed between them. This vibration isolating member 11
As shown in Fig. 5.6, it consists of a cylindrical part 12 that fits into the central through hole 6 of the core 5, and a backing part 13 that is interposed between the cores 5 of adjacent unit transformers 10, and this backing part 13 is formed with a projection 13a that fits into each engagement recess 7 of the iron core 5. The group of unit transformers 10 in such a stacked state is integrated by passing an H-shaped connecting rod 14 through a series of central through holes 6 and sandwiching them as a whole. Reference numeral 15 indicates a fixing metal fitting welded to the connecting rod 14 as an example of means for receiving the lowest unit transformer 10 in this case. Also, the top unit transformer 1
0 to the connecting rod 14 may be equally well secured by ordinary member fixing means. In this assembled state, the secondary winding 2 of each unit transformer 10 is connected in parallel with that of the opposing unit transformer 10 by connecting the secondary side outlet terminals 9 with each other through the conductor 9a, and similarly, each of the secondary windings Line 3 also connects each unit transformer 1
The primary side outlet terminals 8 at 0 are connected in parallel by the conductor 8a, and further connected to the unit transformer 1 at the lowest stage.
The primary side output terminal 8 and the secondary side output terminal 9 of 0 are connected to the power supply side bus 16 and the load side bus 17, respectively. Such connections between the unit transformers 10 and connections with the busbars are performed in the space facing each unit transformer 10 and the space formed by the tapered portion of the iron core 5, that is, the joint portion 5b.

In the collective transformer configured in this way, the joint portions 5b of the core 5 of the unit transformer 10, which correspond to both axial side surfaces of the winding body 1, have a tapered shape. When these are stacked, a space that expands outward from the center is formed between the tapered joints 5b of adjacent unit transformers 10. As a result of this space expanding toward the end, active convection occurs and effective cooling is performed, but the volume of the space can be smaller than before, and this space is also used to connect the lead wires of the winding body 1. Alternatively, since it is used as a wiring processing space for connection to the busbar, it is possible to significantly reduce the installation space.

Next, a second embodiment of the present invention will be described with reference to FIGS. 7 to 9, in which the same parts as in FIGS. 1 to 6 are denoted by the same reference numerals. In this embodiment, unit transformer 1
0 is one in which the primary side outlet terminal 8 of the winding body 1 is provided in the tapered part of the iron core 5, while the secondary side outlet terminal 20 is provided in the central through hole 6 of the iron core 5. Side outlet terminal 20
These are commonly connected by a bus bar 20a extending in the vertical direction. In this case, each unit transformer 1o forms connecting flat parts 21 and 22 having bolt holes (not shown) at two symmetrical locations on the outer periphery of the iron core 5, and when a plurality of unit transformers are stacked, for example, L-shaped. Two connecting rods 23 made of steel
, 24 are applied to a series of connecting flat portions 21, 22 of each core 5 and are integrated by bolting thereto.

1. The same parts as in Figures 1 to 6 are designated by the same reference numerals.
A third embodiment of the present invention will be described with reference to FIGS. 0 and 11. A unit transformer 10 includes a pair of connecting rods 2
A plurality of vibration absorbers 5 and 26 are arranged vertically in a line in the vertical direction, and are integrated by being sandwiched by the connecting rods 25 and 26 via the vibration isolating member 27. Each unit transformer 5
The primary side output terminals 8 are commonly connected to the power supply side bus 16, and the secondary side output terminals 9 are commonly connected to the load side bus 17.

[Effects of the Invention] According to the present invention, in the core surrounding the outer periphery of the disc-shaped winding body of a unit transformer, the joints corresponding to both axial sides of the winding body have a tapered shape. Therefore, when these unit transformers are stacked, a space that spreads outward from the center is formed between the tapered joints of adjacent unit transformers, and active convection occurs in this space, resulting in an effective Since cooling is performed, it is possible to downsize the unit transformer, and this space can be used as a wiring processing space for connecting outlet terminals between the winding bodies or connecting to the bus bar, making installation easier. It is possible to provide a collective transformer that can significantly reduce space.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a unit transformer according to a first embodiment of the present invention, Fig. 2 is a plan view thereof, and Figs. A front view and a bottom view of the main parts of the device, FIGS. 5 and 6 are a front view and a plan view of the vibration isolating member, and FIGS. 7 and 8 are equivalent to FIGS. 1 and 2 in the second embodiment. Figure 9 is also the second
A view corresponding to FIG. 3, FIG. 10, and FIG. 11 in the embodiment are a front view and a plan view of the main parts of the collective transformer in the third embodiment. 1 is a winding body, 2 is a secondary winding, 3 is a primary winding, 5 is an iron core,
5b is a joint, 6 is a central through hole, 1o is a unit transformer, 11
．． 27 is a vibration isolating member, and 14.23 to 26 are connecting rods.

Claims (1)

[Claims] 1. It is equipped with a plurality of unit transformers consisting of a disc-shaped winding body wound concentrically and an iron core made of magnetic powder formed to cover the outer periphery of the winding body, and each unit transformer Among the legs and joints of the iron core, the parts that become the joints are formed into a tapered shape whose wall thickness becomes thinner from the center toward the outer periphery, and the winding terminals are provided in the tapered parts. This output terminal is used to connect the winding bodies of adjacent unit transformers to form a collective transformer.