The insulation of the stator winding

 

(57) Abstract:

The invention relates to the field of electrical engineering and for the specifics insulation of the windings of electrical machines. The technical result from the use of this invention is to improve the dielectric and thermal properties of the main insulation rod winding of the electric machine. According to the invention proposed an insulating michalena (11), which consists of one or more layers (4) tissue kolobrzegu carrier and the layer (5) mica. The carrier is formed of longitudinal fibers (7a) and transversal (7b) and has a volumetric ratio of longitudinal fibers (7a) and transversal (7b) greater than or equal to 2.5:1, and the layer (5) is a pure mica with high packing density. Thus the weight ratio of mica and Kolobrzeg media mickalene (11) greater than or equal to 6:1. 2 C.p. f-crystals, 2 Il.

The present invention relates to insulation for windings of electrical machines. The invention relates to the insulation of the stator winding, containing mikalent with at least one salabrasion carrier which is formed of longitudinal fibers and transverse fibers, and a layer containing fixed at least on one poverkhnostyami mikalent with, at least one salabrasion carrier and secured at least on one surface of the media using binders layer of mica. This insulation of the stator winding is applied, preferably, to the windings of electric machines with high power and high efficiency.

The restrictive part of the invention proceeds from the prior art insulation for the windings, as represented, for example, in the book of Agricultural Sequenz: Manufacture of electrical windings, publisher Springer Verlag, 1973, in particular, on pages 62 and 63. This insulation of the windings contains micaletti that contain panels of solid fiber material, such as paper, silk or glass textile fabric, on which are pasted with the help of elastic connecting means of one or more layers started mica or mikanitov paper. Insulating properties made of such micalet winding insulation are determined in the first place having high dielectric properties of mica, and not having such a high dielectric properties of the materials of the carrier and binder, respectively, impregnating products.

When the insulated conductors of the stator winding GPS receiver properties of the main insulation. At nominal voltages from a few hundred to 3000 In the thickness of the main insulation is changed when a load equal to approximately 2 kV/mm, in the range from 0.5 to 8 mm, are added To this high isolation requirements, which are summarized from thermal loads and machines with a large length of the stator of thermo-mechanical forces stretching in the longitudinal direction of the groove.

The basis of the invention is to create insulation of the stator winding of the type specified above, which compared with the insulation of the stator winding according to the prior art has superior dielectric and thermal properties.

This task is solved in that the insulation of the stator winding, containing mikalent with at least one salabrasion carrier which is formed of longitudinal fibers and transverse fibers, and a layer containing fixed at least on one surface of the media using binders mica, according to the invention in Kolobrzeg media volumetric ratio of longitudinal fibers and transverse fibers is greater than or equal to 2.5:1 and containing mica in the mica layer is a pure mica with a high packing density, thus the weight ratio of pure mica and soyuzresource stator winding used layered media in the form of woven structures, which are the ratio of longitudinal threads and transverse displacement of threads equal to at least 2.5 to 1, while these carriers are equipped with finely ground mica and the ratio of weight of powdered mica and weight of the material media is designed mica tape is equal to or greater than 6:1, thereby providing a compact structure insulation that, when the thickness is smaller, has at least the same electrical resistance as known from the prior art mica tapes, and additionally higher conductivity.

Advantages of the invention, inter alia, are that the impregnated mica tape according to the invention, the resin fraction having low electrical and thermal properties of the binder resin, and the proportion of glass is significantly reduced compared with the share of high quality, finely ground mica.

The invention is illustrated below by the example of execution with the help of the drawings, which depict:

Fig.1 - cut rod winding of an electric machine, equipped with home insulation,

Fig. 2 is a greatly enlarged cut-out from Fig.1, which illustrates a single layer of micaletti main insulation.

Shown shaasana in Fig.1, rod winding of the electric machine consists of many isolated from each elementary conductors 1, each of which is provided with insulation elementary conductor or winding insulation 2. Bundled elementary conductors 1 are surrounded by the main insulation.

In highly magnified cutout according to Fig.2 shows the layered structure of micaletti main insulation 3. For simplicity, it shows only one main insulation layer 3, which consists of two layers, namely layer 5 mikanitov paper and inorganic fabric layer 4, which in this case is made as a layer of fiberglass and is a carrier. Cell fiberglass with longitudinal fibers 7a and transverse fibers 7b, i.e., the space between adjacent optical fibers of fiberglass, constantly filled with the resin, preferably epoxy resin, with a special advantage is obtained when the glass was thermally rassledovanie. To ensure that the proportion of weaker electrically and thermally epoxy resin in layer 4 of glass was as low as possible, the volumetric ratio of longitudinal fibers 7a and transverse fibers 7b is equal to or more than 2.5:1. Due to this structure is created of cloth, which, with one storona durable for the manufacture and further processing is made of micaletti 11. Specified volumetric ratio of longitudinal fibers 7a and transverse fibers 7b, equal to 2.5:1, increases the content of the glass in relation to the proportion of the resin in the fabric layer 4 after treatment compared with conventional micaletti at approximately 25%. Because the fiberglass with respect to the epoxy resin has a relatively good thermal conductivity, thereby increasing thermal conductivity of the resin-impregnated and hardened tissue layer 4.

In accordance with the idea of the invention michalena shows particularly good dielectric properties, when the weight ratio of the content of mica and content of the glass is 6:1 or more. Especially preferred is the use of a thermally-molten part of the mica, which accounts for the proportion of the resin in the impregnated and hardened layer 5 mica is reduced by approximately 20%. This sets the weight ratio of the share of pure mica and the proportion of the resin is approximately 6:1. This measure, therefore, increase the conductivity of micaletti 11, so as mica compared with the resin has a relatively good thermal conductivity.

If the layer 4 fabric before coating to provide a layer 5 of mikanitov paper with thermally visokokachestvenno binders is thermally stable and is suitable for applications up to class H (180o(C) heat resistance.

The insulation of the stator according to the invention with macalintal 11 is compared with conventional insulation is improved by 50% the conductivity, which is about 0.4 W/MK. It should be added that the higher dielectric properties are achieved when the thickness is smaller due to the high content of mica. When using micaletti 11 in the main insulation 3, the following benefits occur.

Basic insulation 3 at a higher dielectric properties has a smaller thickness and conducts heat better. Limited thermally limiting power can be increased on the basis of superior cooling capabilities of the terminals of the winding.

The fill factor of the groove for nested in the slots of the stator winding rods is increased, which reduces losses.

For equal electrical power you can create smaller electric machines.

The invention in the form in which it was submitted, is not limited to the above exemplary embodiment. For example, it is also possible that instead of fiberglass 4 used a mixed fabric with longitudinal fibers 7a of the glass strands and transverse fibers 7b of plastic, ceramic fibres and is, the ne salabrasion carrier which is formed of longitudinal fibers (7a) and transversal (7b), and a layer (5) containing fixed at least on one surface of the media using binders mica, characterized in that Kolobrzeg media volume ratio of longitudinal fibers (7a) and transversal (7b) is greater than or equal to 2.5: 1, and that containing mica in the mica layer (5) is a pure mica with a high packing density, thus the weight ratio of pure mica and Kolobrzeg media mickalene (11) greater than or equal to 6: 1.

2. The insulation of the stator winding under item 1, characterized in that koyabashi media consists of inorganic fabric, in particular of glass, or a mixed fabric with longitudinal fibers (7a) of the inorganic fibers and transverse fibers (7b) of the plastic threads.

3. The insulation of the stator winding under item 1 or 2, characterized in that koyabashi the device is thermally high quality finish.

 

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