SU951573A1 - Magnetic circuit stacked core production method - Google Patents

Description

(54) METHOD OF MANUFACTURING A MAGNIFIED MAGN PACKAGE AND TOP TREATMENT

one

The invention relates to the technology of manufacturing magnetic circuits and can be used in the electrical industry in the manufacture of a laminated package of magnetic pipe.

A known method of manufacturing a laminated stack of magnetic core, including the application of a lacquer containing a solvent, on stamped sheets, drying sheets, assembly of a packet and its heat treatment under pressure. During heat treatment, the coating of each sheet is softened, combined with the coating of the next one, and then cured to a thermosetting state, as a result of which a monolithic package consisting of insulated sheets 1 is obtained.

The disadvantage of this method is the large laboriousness of the technological process, the need for large production areas (for applying a pack with a brush or a spray gun or the presence of a special device for applying a varnish, napammer, roller).

the need for a larger drying chamber for drying individual sheets if the solvent is removed at elevated temperatures.

The closest to the present invention is a method for manufacturing a laminated package of magnetic duct, in which individual magnetic core plates are assembled on a mandrel, the package is pressed, filled with at least a part of the interlayer space with an oval varnish, dried and thermally processed to cure the lacquer base. insufficient adhesion strength due to the formation of voids in the inter leaf space after removal of the solvent.

The aim of the invention is to improve the quality of the manufactured magnetic cores by increasing the strength of the bonding.

The goal is achieved by the fact that before filling the interlayer space of the package with varnish, it is necessary to pre-press the bag with a compression force, in which the bag’s filling ratio is not more than K steel, the bag is dried at a temperature and pressure below the temperature and the boiling pressure of the solvent and curing lacquer bases to remove at least 90% of the solvent, and prior to heat treatment, the package is finally oyed with a compressive force, ensuring a given filling factor This is effected with steel K / j, while the coefficients K and K are related by the following relation. L- (where C is the volume fraction of the base in the varnish. FIG. 1 shows the laminated magnetic package on the mandrel; FIG. 2; the inter-sheet space of the package after impregnation with varnish; FIG. 3 — drying space of the package (Fig. 2); Fig. 4 shows the interpiste space of the package (Fig. 3) after the final crimping. The production of the laminated package of the magnetic conduit is carried out in the following sequence: The mandrel 1 is pressed into the separate plates 2 by the package of magnetic conductor 3 and is pressed in advance with compression force. coeff The bag is filled with steel no more than K. At that, the compression force of the bag is created by pressure of plate 4 due to twisting nut 5 and pressure of plate 6 on springs 7. Then, at least part of the interlayer space 8 is filled with lacquer, for example, by capillary impregnation, with whereby the bag placed on the mandrel is heated to 70-80 ° C in order to reduce the viscosity of the varnish during subsequent impregnation and set in a horizontal or inclined position, after which the impregnating varnish is applied to the side surface of the bag 3 with a brush abbreviations are sucking lacquer. Interleaf space 8 is filled with lacquer (Fig. 2) and then the package is made at a temperature and pressure below the temperature and pressure of the boiling point of the solvent and curing the lacquer base to at least 90% of the solvent. After the end of drying in the interlayer space, the base of lacquer 9 remains, containing no more than 10% of solvent and thickeners 10 (Fig. 3), formed during the removal of the solvent. Then, the package is finally crimped with a compressing force, which ensures that the specified filling ratio of the steel K package is obtained, while the coefficients K and K, j St for 1y by the following ratio 1 k -, N- (c) to where C is the volume fraction of the base in varnish. After final crimping, the bag is heat treated to cure the base of the varnish. An example of implementation of the method of manufacturing a laminated package of a magnetic conductor with a predetermined filling ratio of the package with steel K-0.92 and impregnation of the package with epoxy-polyester varnish of the brand PE-933 with a volume fraction of the base in the varnish C 0.5. After a set of magnetic core plates on the mandrel into the package, the package is crimped with a compressing force, at which the coefficient of filling the package with steel does not exceed K. 0.91-0.5 f - (- c) K, 1 - (- o, 5) -o, e1 Mb.-o „0.54 - moreover, the filling factor K / (controlled by the height of the packet according to the formula HS where M is the mass steel, g; S is the surface area of the plate, y is the specific mass of steel, g / cm; H is the height of the package, see. Then the package is impregnated with varnish and dried at atmospheric pressure and temperature below the boiling point of the solvent until at least 90% of the solvent is removed. Since the lacquer solvent is a mixture of toluene and cyclohexanone with a boiling point of 110 and 136 ° C, respectively, drying is carried out at a temperature not higher than sufficient to remove at least 90% of the solvent, which is determined experimentally depending on the dimensions of the package 3, the configuration of sheet 2 (for example, the differences in the diameters of the outer surface and the bore of the stator), the solvent capacity of the aka and taking into account the heating time depending on the mass of the package with a mandrel, for example, for a stator with an outer diameter of 2OO mm, a bore diameter of 130 mm, a height of 70 mm and a weight with a mandrel of about 15 kg, the duration of the essence, including heating from room temperature to a temperature of 4, is 5- 6 hours

Binging can also be done at room temperature and a pressure of 4000-5000 Pa (30-mm Hg), for which package 3 is placed in a vacuum chamber where it is kept for 1-2 hours.

After the package, the bag is finally pressed into place until the specified filling ratio of the bag is reached and heat treated to cure the varnish base at 155-16 ° C for 1216 hours.

Claims (2)

The invention makes it possible to increase the strength of the gluing of the laminated package of the magnetic circuit due to the elimination of voids in the interlayer space after removal of the lacquer solvent. The method of making a laminated stack of magnetic core, in which individual magnetic core plates are assembled onto a mandrel, pressurized, filled with at least a part of the interstitial space with an adhesive pack, dried and heat treated, for a varnish base, characterized in that the chain of improving the quality of the manufactured magnetic cores by increasing the strength of the gluing, prior to filling the intersheet space of the package with varnish, pre-pressing the package with a force compression, in which the filling ratio of the package with steel is no more than K., the package is dried at a temperature and pressure below the temperature and pressure of the solvent boiling and curing the varnish base to remove at least 90% of the solvent, and before the heat treatment the final pressure testing is performed compression, which ensures that T10GO filling factor of the package is filled with steel Kp, while the coefficients K K K q are related by the following relation TO. 1 1-and-с) к D) where C is the volumetric dale of the base in lacquer. Sources of information taken into account when the expert, 1.Vinogradov N.V. Manufacture of electric machines, M ,, Energie, 1970, p. 85. 2. US patent N 4085347, cl. 310-259, Opuschik, 1978. Srig. fig 1