DE2135467A1 - Ferromagnetic electrical equipment - Google Patents

Description

Patontanw & lte

DIpl.-lng. R. QEETZ Sr. 530-17.294P July 15, 1971

DIpI-In-I. K. LAMPRECHT x;>. f. J.? f J.

Dr.-Ir> 3. [. ·. D £ E T 2 jr. Munich 22, Steinsdorfstr. 10

1. Boris Gerasimovic Burak, MOSCOW - USSR

2. Ekaterina Ivanovna Karetnikova, MOSCOW - USSR 5. Anatolij Egorovic * Leonov, MOSCOW - USSR

4. Juri j Ivanovic "Tesnek, MOSCOW - USSR

5. Vladimir Konstantinovic * Kolmakov, MOSCOW - USSR

6. Pilipp Ivanovic * Peruskin, MOSCOW - USSR

Ferromagnetic electrical device

The invention relates to a ferromagnetic electrical device, for example a power transformer or a pilter choke of a rectifier for electronic communications Devices.

With the development of electronic communications equipment using micro-module components and especially thin-film or Hybrid thin-film assembly technology emerges the problem of creating transformers and reactors that can accommodate them Design to be inserted into the blocks of such devices; i.e., transformers are required which are in height with are comparable to the flat design of the communication electronics device blocks.

In the known types of induction devices the magnetic conductor is usually designed in the form of an E or O core with windings housed in the window of the magnetic conductor.

53O ~ P.34578 / l-BTE (7)

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leads. The ratio of the average length 1 CMittellänge) of the turns of the windings of such devices to the average length l ₀₅ of the magnetic induction lines (in the magnetic head means length of the magnetic circuit) is equal to about 1, the ratio of the cross-sectional area q _Q of the magnetic conductor to cross-sectional area q of the magnetic head of the window is in the Range of 0.5 - 2 selected. -.

A disadvantage of known ferromagnetic electrical devices, Particularly in the case of transformers for telecommunications equipment, the fact that the small volume is more limited Cooling surface makes the distribution of heat significantly more difficult and thus the power per unit of mass of the transformer is reduced with a permissible excess temperature, as well as the arrangement of the transformer in the area of the block volume made available for the message electronic Devices obstructed,

To the disadvantage of such small transformers, especially the Toroidal core converter, is also a lower filling coefficient of the Count the window of the magnetic conductor with active material of the winding, which is usually in the range of 0.05-0.25.

One of the disadvantages of conventional ferromagnetic electrical devices is that the winding is usually made in the form of coiled turns made of round or square wire. The winding process itself causes certain difficulties in the manufacture of the ferromagnetic electrical devices. ■ ·. ■. ... _: .

The observed tendency towards the transition to low voltages in modern equipment leads to the fact that the transformers with; less number of winding turns can be made. Under _...

2 09 8 0 97 1 06 4

eADORlGINAL

otherwise all things being equal this calls to a large extent an enlargement of the magnetizing current Sj "especially in small transformers, Jbrervor, -what -in turn as a major disadvantage of the known Transformers is to be evaluated,

The Krfinctong is based on the task, with the elimination of the The aforementioned Jäacht-eile a ferooraagnetlsehe electrical device to create a new geometrical design that is compatible with communications electronics Devices for planar blocks is comparable »e.g. for devices that use the technology of hybrid thin-film circuits use, while reducing the mass and dimensions of this device and simplifying the Manufacturing process »|

According to the invention, the problem posed is achieved in that 3 the ratio of the cross-sectional area of the magnetic conductor to the window peat pool at least 5 and the ratio of the middle ranks of the winding turns to the mean length of the magnetic induction lines is at least 5 in the magnetic conductor,

The ratio of the cross-sectional area of the Magnetic conductor to the window area at most 200 and the ratio of the center length of the winding turns to the center length of the magnetic induction lines in the magnetic conductor selected at most 75 "

In addition, each winding is expediently in shape executed a separate turn and encompassed by the magnetic conductor.

The ferromagnetic electrical device according to the invention is used for planar assembly and allows its Mass by 1.5 to 5 times as well as the volume of the message

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electronic device due to its flat design by about 3 times to reduce.

In the following, the invention is explained in more detail using exemplary embodiments and the drawing. Show it:

Figs. 1, 2 and 3 show a transformer with a plate magnetic conductor according to the invention (in front view, side view and top view);

Pig. Figure 4 shows a planar mount transformer according to the invention with a complicated design of the magnetic conductor and the windings;

FIGS. 5 and 6 show a transformer with a magnetic conductor,

assembled from individual tube cores (in front view and side view);

Fig. 7 is an overall view of the tube core;

Figs. 8, 9 and 10 show a transformer in which each winding executed in the form of an open turn and

11 shows a modification of the transformer's seal.

As can be seen from Fig. 1, 2 and 3, the transformer consists of a sheet metal magnetic conductor 1, in the windows 2 with a Cross-sectional area q windings 3 are housed.

The magnetic conductor 1 is assembled from sheet metal bodies 4 and 5. The magnetic conductor 1 can also be made wound from ribbons.

The turn center length 1 of the windings 3 is several times (over three times) greater than the central length 1 of the magnetic ■ induction lines in the magnetic conductor 1. This is expediently Ratio 1/1 chosen in the range of 3-75.

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This ratio 1. ^ / 1 _s in the transformer makes it possible to create a flat design of the transformer. The windings 3 are mainly located in the magnetic conductor 1 and have winding connections 6.

The windings 3 are laid in the windows 2 of the magnetic conductor 1. The filling coefficient of the window 2 of the magnetic conductor with the active material for the windings 3 is 1.5 to 2 times higher compared to the known types due to the lack of the winding carrier. To the action of a gap 7 in To reduce magnetic conductor 1 to the magnetic properties of the transformer, the sheet metal bodies 4 and 5 are assembled with butt joint as shown in Fig. 1, -2 and 3 plumb bob. The structure | the sheet metal body with a nested joint is possible using one of the known methods.

The increase in the length of the magnetic conductor 1 and the windings 3 over the winding length allows the mass of the magnetic conductor 1 and the windings 3 to distribute, which in turn increases the power loss value per unit volume and leads to an improvement in the cooling conditions of the transformer. The ratio of the cross-sectional area q of the magnetic conductor 1 the cross-sectional area q of the window 2 is preferably im Range from 5 - 200 selected.

The transformer can be covered with lamelHertem or tape wrapped ^ or articulated and non-articulated magnetic conductor will. The magnetic conductor can be wound up with sheet metal strips, which are placed on top of each other or at an angle to the longitudinal axis of the magnetic conductor, causing the mutual displacement of the tapes in each winding to be wound and an equivalent gap of the required size in the magnetic conductor forms to the corresponding properties of the magnetic conductor

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obtainable, e.g. when used in the filter choke of a Rectifier if the bias current is significant, The magnetic conductor can be removed by spraying the windings directly using one of the known methods.

In all of these cases, apart from its design, the transformer can be given any predetermined shape, for example by placing it on the block outline of the communications equipment. In Fig. 4 is a transformer ^? i, which is designed in the form of a complicated, curved and in one plane lying tube. After the transformer 8 has been manufactured in the required shape, a sealing compound (for example with Fpoxydhärzen) is applied to its magnetic conductor by means of one of the known methods. In this exemplary embodiment of the transformer 8, winding ends 9 can serve as transformer connections.

In Figs. 5 and 6 there is an embodiment of a transformer shown, whose magnetic conductor is composed of several cylindrical cores 10, which are wound for example with bleehbands made of soft magnetic material, with windings 11 of the Transformer are located within the cores 10 and are provided with connections 12.

The cross-sectional area q_ of the magnetic conductor becomes in this case

as the sum of the cross-sectional areas q 'of the individual cores 10 determined (Fig. 7), i.e.

with η = number of cores in the magnetic conductor.

In Fig. 8 and 9, a type of flat transformer is ge shows, in the windings 13, 14 and 15 from individual winding

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BATH ORIGINAL

Wires are carried out, which are stretched within a magnetic conductor 16 and along its longitudinal axis, wherein the winding wires represent open turns. The windings I3, Ik and I5. are connected either in series or in parallel.

The arrangement of the windings 13, 14 and I5 within the magnetic conductor 16 in the form of open turns allows the filling coefficient of the core window of the magnetic conductor 16 with the active material for the windings by 5 to 5 times in comparison to increase the conventional toroidal transformers, reducing the specific weight and volume of the transformers increase. In addition, such a construction allows the winding of the windings in the manufacture of the transforma- { gates are eliminated and contributes to the further automation and mechanization of the manufacture of transformers.

This embodiment of transformers allows connections I7 of windings 13, I9 and 20 to any Place along the entire length of the winding between cores 21, 22 and 23.

The sealing or encapsulation and protection of such transformers before exposure to the environment can be carried out using one of the known methods, e.g. by placing in a thin tube with subsequent filling with polyester resin or by potting in a mold in which the transformer ™ after potting assumes the shape of a flat module block 24 with connections 25 arranged on its circumference.

The types of transformers according to the invention, which are implemented in a closed magnetic conductor, have a lot smaller central length 1 of the magnetic induction lines in the magnetic conductor, which reduces the magnetizing current of the transformer

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is diminished as it is out of the "ratio H 1

can be seen with

I ₁ = magnetizing current,
H = field strength,
w = number of turns.

From the formula given, it can be seen that the reduction in size ₁ reduces the magnetizing current I 1. The reduction in the number of turns w increases the magnitude of the magnetizing current I,. The reduction in the number of turns w with a simultaneous reduction in the central length I ^ of the magnetic induction lines makes it possible either to reduce the current I- or to keep it at the original level.

The types of transformers and chokes according to the invention gave favorable operating results in practical testing.

The following is a table of the parameters of a transformer when feeding with 1000 Hz voltage at an excess temperature of 55 ° C. With the increase in the feed frequency the transformers according to the invention offer a great advantage in terms of mass and volume over the conventional ones Transformers,

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bad omm ^

Tabel

Power Mass of the mass of the K mass of the VoIu- Leist-Leist-1 VA magnetic line copper transforms,--* - £ - ters g with isolators cnr mass-volume g g mix-

holds- Vernis holds. VA / g VA / cnl x ⁵

23 16.8 3.3 20.1 3.4 1.1 6.8 28 50 27 8.2 50.7 8.4 1 5.9 59

The transformer (see table) with an output of 50 VA is designed with the same cores as the 23 VA transformer, the only difference being that the number of cores is increased, which changes the ratio l _y / l _s from 28 in 59 and q / q of 60 resulted in 1A9.

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Claims (4)

Claims {1,1 Ferromagnetic electrical device with a magnetic conductor made of soft magnetic material in its windows
Windings made of highly conductive material are housed,
characterized in that the ratio
the cross-sectional area (q) of the magnetic conductor (1) to the window area (q) at least 5 and the ratio of the central length Cl) of the winding turns (3) to the central length (1) of the magnetic induction lines in the magnetic conductor (1) is at least 3. 2. Feiromagnetische electrical device according to claim 1, characterized in that the ratio of the cross-sectional area (qj des
Magnetic conductor (1) to the window area (q) does not exceed 200. 3. Ferromagnetic electrical device according to claim 1 or 2, characterized in that the ratio of the central length (1) of the Winding turns (3) to the central length (1) of the magnetic induction lines does not exceed 75 in the magnetic conductor (1). 4. Ferromagnetic electrical device according to one of the claims 1-3, characterized in that each of the windings (13, 14, 15) in Form of a separate, by the magnetic conductor (16) encompassed turn is carried out. 209809/1064 Blank page