RU198705U1 - Smoothing reactor - Google Patents

Abstract

The utility model relates to electrical engineering, reactors for smoothing rectified current ripples. The smoothing reactor contains a layer winding installed on, preferably, a core magnetic circuit. Each layer of winding is a turn of a thin-sheet conductor. The height of the conductor corresponds to the height of the winding, and insulation is placed between the turns. EFFECT: increasing the manufacturability of the reactor, decreasing heating by increasing the cooling surface and increasing the reliability of the reactor without significantly increasing the dimensions of the device. 1 wp f-ly, 3 dwg

Description

The utility model relates to electrical engineering, in particular, to reactors for smoothing rectified current ripples. The device can be used in rectifier circuits or thyristor converter.

Known smoothing reactors company QinhuangdaoHuashenglongElectricalEquipmentCo, Ltd. [http://reactorinchina.com/: Website of the company QinhuangdaoHuaShengLongElectricalEquipmentCo., Ltd [Electronic resource]. - Access mode: http://reactorinchina.com/3-1-5-smoothing-reactor/231751], having an air core and a coil winding wound with copper busbars.

Another well-known dry smoothing reactor [Eliz.zp.ua: site of LLC "Eliz" [Electronic resource]. - Access mode: http://www.eliz.zp.ua/about-company/novosti/181-aprel-2015g.html] has a cylindrical winding, the turns of which are wound with an aluminum bus. With the help of spacers and rails, the winding is fixed between fiberglass supports and pressed with beams. All metal parts of the reactor have protective anti-corrosion coatings.

The design of the windings made with copper or aluminum buses is characterized by low manufacturability: in addition to the high labor intensity of making turns by winding the bus, it becomes necessary to perform interturn insulation in the axial direction along the winding, which practically excludes the possibility of automating the winding process. Also, the presence of insulation in the axial direction leads to an increase in the height of the winding.

The known design of the smoothing reactor [Patent RU 2627730, prior. 10/30/2015, publ. 05/11/2017, H01F 38/02, H01F 3/14], containing at least one block including an inductor located in a non-magnetic environment. The coil is oriented vertically and can be made of bare aluminum or copper wire. In order to avoid their galvanic contact between themselves and the structural elements of the magnetic system, the turns of the coil can be fixed with dielectric parts - rack spacing.

The disadvantage of this solution is the high material consumption and laboriousness of manufacturing the magnetic circuit due to the presence of yoke parts and the need to section the rod. The presence of additional dielectric parts complicates the technology and increases material consumption.

Known smoothing reactor [Reactormash.ru: site of LLC "Reactor machines" [Electronic resource]. - Access mode: http://reactormash.ru/products/sglazhivayushhie-i-filtrovyie-reaktoryi/?yclid=13 66713260679904129, free], which is an inductor coil on a ferromagnetic core. The winding of the reactor is cast or using a rectangular wire with silicone insulation. When winding, a rectangular stranded wire is used, including enameled one with silicone insulation.

The design of the winding in this solution is not disclosed, which does not allow drawing conclusions about its manufacturability. The photographs, presumably, show a multilayer cylindrical winding made with a wire, which, firstly, implies the need to perform additional pressing of this winding, and secondly, it increases the material consumption due to the solid insulation of the wire and additional parts that provide pressing.

Another well-known smoothing reactor [Utility model RU 193653, pr. 03.09.2019, publ. 11/08/2019, H01F 27/28 (2006.01), H01F 27/32 (2006.01)] has a disc coil winding with external cast resin installed on a magnetic circuit. Each coil of the reactor is made of several layers of thin-sheet conductor, and each of its layers is one turn of the conductor, and thin-sheet insulation is placed between the layers.

To ensure the rigidity of the sectional (coil) winding, it is necessary to use cast external insulation, which requires additional technological operations for pouring and baking the insulation.

Most analogs have larger dimensions than the claimed solution, are less technological, more material-intensive, which is why they have a higher cost price.

When implementing the claimed utility model, an increase in the manufacturability of the reactor is achieved by reducing the labor intensity of its manufacture due to the elimination of a number of technological operations and the possibility of automating the process of winding the winding.

The inventive smoothing reactor contains a layer winding installed on, preferably, a core magnetic circuit. Each layer of winding is a turn of a thin-sheet conductor. The height of the conductor corresponds to the height of the winding, and insulation is placed between the turns.

A winding made of a foil continuous in height cannot be used for large alternating currents, since due to eddy currents, most of the alternating current is displaced into the foil ends, causing them to overheat. Such processes occur when using the claimed design, for example, in current-limiting reactors.

The smoothing reactor, as previously indicated, is designed to smooth out the ripple of the rectified current, that is, to operate on almost direct current, which contains higher harmonics of the alternating current, usually not exceeding 10% of the rated direct current. This feature of the smoothing reactor (operation at almost constant current) allows the use of tape conductive materials (for example, aluminum or copper foil) in its design, without fear of significant effects of such phenomena as eddy currents in the conductor (Foucault currents) and displacement of current to the ends of the conductor ( uneven distribution of current density over the cross section of the conductor) and, as a consequence, large additional losses in the conductor and heating.

The use of a thin sheet material, the height of which corresponds to the height of the winding, makes it possible to exclude some technological operations, and, consequently, to reduce the labor intensity of manufacturing the reactor, and to increase its manufacturability.

In addition, the inventive winding does not have sections, and therefore no gaps between them, which makes it possible to obtain a device of lower height than a similar one with a sectional (coil) winding.

The essence of the claimed invention is illustrated by drawings, which depict:

figure 1 - the active part of the reactor, General view,

figure 2 is a top view of the reactor,

figure 3 - winding with one axial channel.

To confirm the possibility of the utility model realizing its purpose and achieving the declared technical result, we will consider a reactor design option.

The inventive smoothing reactor contains an aluminum or copper layer winding 2 installed on the magnetic core 1. Each layer of the winding 2 is a turn of a thin-sheet conductor, for example, tape or foil. The height of each turn of the winding 2, that is, the height of the foil or tape, corresponds to the height of the entire winding 2. Preferably, a core magnetic circuit 1 is used, as the simplest and most technologically advanced.

The implementation of the windings from a thin-sheet conductor allows to reduce the labor intensity of manufacturing the smoothing reactor by automating the winding of the winding and eliminating some technological operations.

So, for example, a wire coil winding is wound manually, and in order to give the winding the required rigidity, a laborious operation of shifting the coils during the winding process is performed. When installing a wire winding on the core magnetic circuit, the winding pressing operation is performed. To ensure the required level of dielectric strength, the winding wire has its own insulation.

The winding of thin-sheet conductor windings is automated, and no re-laying is required in the manufacture of the reactor. Layer winding with the height of each layer corresponding to the height of the winding has sufficient rigidity in itself, and when installed on a magnetic circuit, there is no need for pressing.

Insulation is laid between the turns of winding 2. A thin-sheet conductor does not have its own insulation and to ensure the required level of dielectric strength, the insulation is laid only between the layers and at the ends of the winding.

In the radial direction, the winding 2 can be divided into groups of several turns (layers) in each group. For example, figure 3 shows a winding in which groups of N and M turns are highlighted. Distance elements 3 are installed between the groups of turns (layers) to provide axial cooling channels (see Fig. 2), for example, distance rails 3. Such measures allow reducing heating by increasing the cooling surface and increasing the reliability of the reactor without significantly increasing the dimensions of the device.

Claims (2)

1. A smoothing reactor containing a layer winding installed on a magnetic core, each layer of which is a turn of a thin-sheet conductor, the height of the conductor corresponding to the height of the winding, and insulation is placed between the turns. 2. The smoothing reactor according to claim 1, characterized in that the magnetic circuit is made of a rod.

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