SU974509A1 - Method of diagnosis of compaction of magnetic laminated core - Google Patents

Description

one

The invention relates to the technology of manufacturing cores of magnetic cores and can be used in the electrical industry.

A known method for diagnosing the pressing of a laminated core of a magnetic core according to the degree of penetration of the probe into the laminated core. However, this method allows to evaluate the quality of: pressing,: without a quantitative assessment, which makes it ineffective 1m.

Closest to the proposed / method of diagnosing the pressing of the laminated core of the magnetic core, including measuring the magnetic characteristics in the diagnosed area using aai pressing density - indicators of magnetic anisotropy - and determining the pressing force based on the change in the magnetic characteristics of the pressing force 21.

However, this method is characterized by insufficient diagnostic efficiency.

compacting, since diagnostics can only be carried out on a stopped machine, and magnetic characteristics are measured using sensors mounted on the core adjacent cores, which makes it possible to estimate only the average amount of pressing of steel of the whole core and the poets does not provide accurate diagnostic accuracy.

The aim of the invention is to increase the efficiency of diagnostics by conducting it on a running machine and improving the accuracy of determining the force of the presses;

This goal is achieved by experimentally determining for the diagnosed core of the magnetic core the dependence of the pressing force on the axial component magnitude of the INDUCHI, the axial component of the magnetic induction in the corresponding core zone is measured, and the pressing force is determined by the indicated dependence. .

FIG. Figure 1 shows the dependence of the axial component of magnetic induction on the pressing force of the core; in fig. 2 shows a device for determining the dependence of the pressing force on the magnitude of the axial component of the magnetic subquinterity.

The installation for determining the dependence of the pressing force on the magnitude of the axial component of the magnetic induction O (Fig. 2) consists of a magnetizing coil 1, a magnetic core 2, a bed of a press 3, a compression plate 4, a package of core 5, magnetic induction sensors 6 and 7.

The essence of the method for diagnosing the repositioning of a laminated magnetic core is as follows.

Each point of the blender, which is a heterogeneous 20 anisotropic body, is characterized by its magnetic permeability values for three mutually perpendicular p {1st axis.

There is an unambiguous relationship between the magnitude of the axial component of the magnetic induction at a given point of the laminated core and the magnetic permeability of the core in the same direction for a given value of the main magnetic flux.

The magnetic permeability along the axial axis depends on the pressure, the pressing of which increasing decreases the air gaps between the individual, electrical segment steel, 35

as a result, the steel filling ratio of the prome day increases in the axial direction. With the help of the Bj f (СГ) dependence (Fig. 1), the degree of axial stator core can be judged by the change in the axial component by induction 40.

A method for diagnosing the pressing of a laminated magnetic core is carried out as follows: 45

On the frame of the hydraulic press 3 (fig. 2), the layout of the laminated core 5 is installed in the pressing plates 4. Pressing the pressing package 4 transfers the package 5 through the program set by the experimenter through the pressing plate 4. The magnetic flux in the packet is created by using magnetizing coils 1 and a magician of coaxers 2. Coil 1 is powered from an adjustable source of alternating current, with a frequency of 5 o. The axx / 1 component of the magnetic field induction is measured on the package surface (sensor -7) and in its depth (dates

chik b). At various values of the pressing force, the readings of the sensor 7 are kept constant. The axial induction component of the magnetic field at the point of installation of the sensor 6, when the specific pressing force varies, varies from 0 to 16 kg / cm.

Obviously, to measure the pressure of a compact in a bag, it is necessary to know the magnetic induction included in the bag () and in the depth of the bag (B 6). If the magnitude of the field on the surface of the package is kept constant, then the field in the main packet can be entered in the B-2 (SG) dependence in units of magnetic induction. If the field on the surface of the package changes, then the field in the depth of the package also changes, however, their ratio for a fixed pressure remains constant in a sufficiently large load range. In particular, as the analysis of the results of the axial magnetic field research on the TGV-500 turbo-generator under various load conditions showed, this ratio is stable at a constant CO9 and when the active power varies from 0.6 to 1.0.

Fig. 2 shows that the floor sensor included in the package is installed on the package surface (sensor 7). However, it can be installed in the package for some distance from the top of the package. In this case, the ratio of the sensor readings determines the pressing pressure at the site of the sensors.

When the machine is twisted, the sensors of the axial induction component are placed in the active steel packages. During the start-up period of the machine and in operation, for example, in idle mode at nominal voltage or in nominal load mode, the axial value of the corresponding induction corresponding to the pressure in the new machine is measured using these datjes. After some time of operation of the turbogenerator, the measurements are repeated in those modes, the values of the axial component, 02-2, etc., are obtained, by which the change in pressure of the pressing during the operation (G, (J / L, etc.) is determined. ) When pressure reaches b, (, the turbogenerator is subject to repair.

Claims (2)

The invention makes it possible to increase the efficiency of the pressing of the compression cores of the magnetic core. Claims The method for diagnosing the pressing of a laminated magnetic core, including the HSMepeHTie magnetic characteristics in the diagnosed area using sensors and determining the pressing force based on the dependence of the magnetic characteristics on the pressing force, differs in that in order to increase the efficiency of the diagnosis. Due to its operation on the machine and increasing the accuracy of determining and dividing the pressing force, experimentally, for the diagnosed magnetic core, the pressing force is dependent on the axial magnetic induction component, and the axial magnetic field inductance is measured in the corresponding core area and the pressing force is determined from the indicated envy. Sources of information taken into account in the examination 1.Bletkvn N.P. et al. Monitoring the state of the NIN pressing the active steel of the turbogenerator. In icinme Ways to improve the reliability of AC electrical machines. Kiev, 1977, p. 62-63. 2. Danilevich Ya. B., Kasharsky E.G. Additional losses in electric cars. M., Gosenergonzdat, 1963, p. 91. p-con $ i cffsV- con Si