FI57323B - KYLNING AV PELARAKTIGT ANORDNADE INDUKTIONSSPOLAR - Google Patents

Description

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jCTa [b] <11> utlägcningsskmft 57323 C ¢ 45) Patent granted 10 J7 1930 Patent meddelat - '(si, mW! H 01 P 27/08 // H 01 F 37/00 FINLAND — FINLAND (21) JA32 / T3 (22) Htkomliptlvl — Aiweknln | (dag OU.05.73 (23) Allcuptty »—Glltlfhottd · * 0U.05.T3

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Patent · and register-administered NShtMtoip «monthMoitai», date -

Patent · och reglsterstyrelsen 'AnaMun uttafd och utUkrtften published 31.03.80 (32) (33) (31) Pyydetty «uolkeu · —Begird priority 09.08.72

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 2239865.8 (71) Siemens Aktiengesellschaft, Berlin / Miinchen, DE; Wittelsbacherplatz 2, 8 Munchen 2, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (72) Ulrich Schuler, Berlin, Hans-Gunter Nehse, Berlin, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (7U) Oy Kolats Ab (5U) The present invention relates to statically placed electrical induction coils provided with plate-wound insulated wires in which the individual plates are biased together by bolts and external ends of external plates. , wherein the individual plates remain spaced apart by means of insulating, closed annular plates which fold ribs extending substantially radially on the aoleate end surfaces, which completely cover the area of the plates and in which the gaseous coolant passes radially between the plates.

Such electric induction coils are known from German patent publication 42? 442, which describes forming coils. These types of transformer coils do not contain any free interior space at their center, but surround the iron core. For cooling, transformer coils, as is known, with an iron core, are placed in a container containing a liquid or gaseous 57323 different substance. During the transformer operation, this insulating material or refrigerant circulates in the presence of the circulation due to the separate condition of the individual parts and passes between the individual cavities. In order to get the choke coils sufficiently cooled during such a natural cycle, a relatively long interval is necessary because the refrigerant in the natural cycle flows at a relatively low rate so that the even higher · In addition, the ribs on both end faces of the spacers are hollow ribs through which the coolant also flows · In these places the result is a relatively wide rib support on the end faces of the plates, so -here there is no direct contact with the coolant but heat must first pass through the actual spacer. as it can be delivered to the coolant flowing through the hollow fins.

Other types of inductors, namely electric air core chokes, also exhibit intense heating during operation due to high currents, which necessitates special measures for efficient heat conduction in the presence of cooling air. Thus, German patent publication 1 266 874 discloses an air-cooled ila core core coil consisting of plate-shaped insulated wires. These single, closed, annular plates are layered on top of each other, keeping the insulating intermediate layers spaced apart, which corresponds approximately to the height of the plates. The Hoko spindle choke coil is tensioned together with bolts and frosting elements pressing against the forehead surface of the spindle choke coil.

Summer in a well-known air choke coil cooling The air flow flows between the plates radially! ··· ti from the outside inwards and then in the axial direction in the air ducts, which are closed on one side in the free interior of the plates. This space, together with the axially passing air ducts, forms dirt from the suction of the fan located above the choke coil. The known coil core coil is thus cooled according to the flue principle, and the amount of recirculated air is determined on the basis of the dimensions of the axial air duct acting as the flue. This results in good and, above all, even cooling in several superimposed choke coils. In each cavity, however, the construction height of the device is relatively high.

5 57323

It is an object of the present invention to provide a partial cooling of the superimposed inductor of the air core coil coil and, in addition, to reduce the number of coils of the air coil coil. According to the invention, the inductive coils of the above-formed individually ventilated air core windings include a free enclosed interior on one side which forms a suction and pressure space of the fan. on.

The air core choke coil according to the invention is thus separately ventilated. Due to the low height of the closed fins, very narrow slits are created in each end face of the ring plates, through which the cooling air sucked in or blown out by the fan flows at a high speed. Thus, the cooling effect is not provided by a large amount of coolant, but by a high flow rate in the cooling chamber. The end faces of the plate-wound wires are uninsulated to improve heat transfer, and the insulating ring plates, which cover the area of the plates sufficiently, act as a leakage-preventing insulation. On the front surfaces of the plates, good heat transfer to the cooling air flowing at high speed is achieved at the point where the cooling air flow rate can be somewhat influenced by choosing a suitable rib height. · Because the ribs consist of closed ribs, their support surface is small, so practically the entire circumference of the plates must be Thus, all the cooling air flowing through the ribs of the ring plates is used immediately for cooling. Thus, it is possible to efficiently remove the generated heat.

In addition to this, the air core choke coils are very tight in construction due to said narrow slits, so that a very low building height is obtained. In addition, a very narrow connection of the individual plates is obtained, as a result of which the inductance of the spindle choke coil increases or less active conductor material is required for the same inductance.

It is also possible to superimpose several electrically and mechanically independent chokes and connect a common, one-sided interior to the fan. This el needs to be fitted immediately in the air core sockets, but it can also be in the present ventilation duct, which is also used for other devices. In the latter case, I don’t most often question the pressure blower.

Such a llmaeydakurlstlakel formed according to the invention can be used particularly advantageously as a filter choke in the DC intermediate circuit of variable speed motors. Since these filter chokes conduct relatively large direct currents but have only low voltages, there are no insulation problems due to the narrow gaps opposite the end faces of the uninsulated wires. The dimensions of the parts passing over the inner and outer diameters of the tire plates must be chosen so as to obtain a sufficiently long leakage current path.

The following invention will be explained in more detail with the aid of the embodiment shown in Figures 1-5 *

Fig. 1 shows a partially sectioned view of an air core choke coil formed according to the invention, Figs. 2 and 5 show top view of insulating annular plates between the plates * The electric air core choke coil 1 consists of a suitable number of superimposed plates 2 to which e.g. copper wires are wound high. the individual windings are still insulated from each other, but the end faces of the wires are not metallically insulated, only protected with a thin layer of lacquer *

Between the plates 2 there are in each space ring plates 5 of insulating material covering the area of the plates 2 and having ribs 4 on both end faces. On top of these ribs there are uninsulated end faces of the plates 2 so that a narrow gap 5 is formed next to each end face. is small compared to the height of the plates 2, you * the height of the wires *

All the superimposed plates 2 and the ring plates 5 are tensioned together by means of tensioning elements 6 formed of weight plates, which borrow against the end faces of the air-core choke coil 1 and possibly by insulated bolts 7 into a mechanically very strong and tight unit *

The free interior space Θ of the plates 2 or the ring plates 5 forms a space for the fan 9 »attached to the upper tension element 6, which covers the free interior space 8 *

The cooling air sucked by the fan 9 passes through the narrow slots 5 at a relatively high speed past the uninsulated ends of the wires of the plates 2 and thus effectively dissipates the heat generated in the ducts * As heated cooling air is carried up by the fan 9, it is guaranteed that cold cooling air always enters through the slots 5 * thus the height of the fins 4 also determines the speed of the cooling air * It must be chosen relatively small, e.g. in the range of about 2-6 mm, because the cooling air has a relatively large air inlet cross-section, namely the entire width of the gap 5 * , if desired, to extend the path of the cooling air through the gap 5, also to make the ribs 4 curved, as shown, for example, in Fig. 5 *

Since the ring plates 5 and the ribs 4 are insulating material and are allowed to pass over the inner and outer diameters of the plates 2 so far that a sufficiently long surface leakage distance is created which the voltage between the plates 2 cannot overcome, there are no insulation problems despite the low height of the ribs 4 *

Claims (2)

5 57323 Fa Exam Requirements: A faceted electric induction coil provided with wires insulated from each other in a plate-like manner, the individual plates being tensioned together by bolts and tension elements pressing against the outer end face of the outer plates, the individual plates being spaced apart by substantially radially insulating two end faces due to closed annular plates which completely cover the area of the plates and in which gaseous coolant - runs radially between the plates, characterized in that the induction coils formed as separately ventilated air core choke coils (1) include a free interior (8) closed on one side, which forms a fan (9) - or a pressure space that the height of the closed ribs (4) on the ring plates (3) is small compared to the height of the wires and that the uninsulated end faces of the wires wound on the plates (2) are located immediately in the rib n (U) on. Electric induction coil according to Claim 1, characterized in that the height of the ribs (lt) is approximately 2 to 8 mm.