SU1246257A1 - Method of manufacturing magnetic circuits with applied winding - Google Patents

Abstract

The invention relates to the field of electrical engineering, in particular to the method of spray and drip impregnation of the windings of electrical products. The purpose of the invention is to improve the electrophysical characteristics of the windings by eliminating leakage of the composition. . For this purpose, the windings of an impregnating composition rotating under the action of a magnetic field, which additionally contain a finely dispersed ferromagnetic filler, are applied to the frontal windings. After the impregnation is over, the winding is passed by e-mail. current. For a more uniform impregnating composition, the amplitude of the rotating magnetic field is varied according to a periodic law. Under the action of a magnetic field, between the windings of the winding and the ferromagnetic impregnating material, attractive forces arise that prevent the composition from flowing out of the winding. 1 h. item f-ly, 2 ill. from S W to 4 &) N) SL

Description

f

The invention relates to electrical engineering and can be used, for example, in the manufacture of windings of stators and koreas of electrical machines, transformers and chokes.

The aim of the invention is to improve the electrophysical characteristics by eliminating the leakage of the impregnating composition.

FIG. 1 shows an apparatus for a jet-droplet process; Fig. 2 shows a unit of this installation that switches off the jet of impregnating composition.

The method is carried out as follows.

A heated impregnating composition, additionally containing a finely dispersive ferromagnetic material, is fed to a heated, wound magnetic conductor. A rotating magnetic field is applied perpendicularly to the jet of the impregnating composition, the amplitude of which varies according to a periodic law. Under the influence of the forces acting on the ferromagnetic particles from the magnetic field and the adhesion forces holding the impregnating compound on the surface of the ferromagnetic particles, the impregnating jet bends, rotates and oscillates synchronously with the rotation and change of the amplitude of the magnetic field. The impregnation mode must be worked out taking into account the geometrical dimensions of the wrapped magnetic cores.

At the end of the impregnation through the winding, an electric current is passed, which creates a magnetic field in the winding and around it. Under the action of this magnetic field, attractive forces arise between the winding turns and the ferromagnetic impregnating material, which prevent the impregnating composition from flowing out of the winding.

Example: Conduct the windings of the stators of the motor 4A112M on the proposed installation. The installation for stretching and drying the windings of electric machines consists of a bed 1 and a multi-position table 2 on which platform 3 is installed with installation slots 4 for impregnated products, such as stators 5. The multi-position table is located on the shaft 6 and is driven in rotation by a drive 7 The impregnating mixture is in the metering device 8, in which

ten

15

/ -) 62572

The stirrer 9 is placed, which is driven in rotation by the actuator 10. Three racks 13 are fixed to the outer part of the nozzle II of the metering device through a ball bearing 12, to which a die plate 15 is attached to the dielectric circular platform 14. On the surface of the platform there are two conductive rims 16, the current supply to which is drying: through the brushes installed in the brush holder 17, the electromagnet 21 is fixed to the bottom of the platform through the hinges 18, 19 and the rods 20 through the terminals 22. The platform is available in rotation of the disk 23 located on the shaft of the electric motor 24. The product is connected to the power supply by means of electrical conductors through brushes installed in the brush holder 25, the electrical conductors are fixed in the lower part of the rotating table. The brushes of the ring are fixedly mounted on 25 plate 27..

In impregnating | Compound KII-34 before irrigation was introduced on 30 May. % Nickel-zinc ferrite powder brand 600 NO, with a grain size of not more than 10 microns. The particle size is chosen from the condition of their free passage in the inter-turn winding cavities, which was satisfied when the inequality was fulfilled, where d. - diameter fer20

thirty

40

romagnetic particle: df, p is the diameter of the wire in the insulation {this inequality is derived from the condition of tight packing of the turns of the stator groove).

When the stator heated to 80 ° C arrives at the impregnation position, the power supply to the re- supply is disconnected. stator current, turning on the supply of the impregnating cMgcH, electric motor

 puppy disc and power electromagnet,

The electromagnet rotates at a speed of 1 rpm, the amplitude of the current, to acquire the electromagnet, varies according to a periodic law with the frequency

50 that 1.5 Hz

(To the impregnating composition, under the influence of a magnetic field, it bends and rotates along the frontal part of the stator winding with a speed of

55 1 rev / min and vibrates at a frequency of 1.5 Hz across the front of the winding. Watering duration is 3 minutes.

I

Claims (2)

After completion of irrigation, the metering device, the electric drive of the dielectric disk and the powering of the electromagnet are disconnected and a voltage of 50 V is applied to the winding. As a result of the current passing through the stator winding, a transverse magnetic field is induced in it, under the action of which the ordered orientation of the ferromagnetic material particles and their hardness fixation in the inter-turn cavity. The interturn cavities are locked, the flow of the impregnating composition ceases. The current passing through the stator winding provides heating and polymerization of the impregnating composition. Invention Formula I. Method of making wrapped magnetic cores, including impregnation 46257Л and drying of the latter, in which a jet of impregnating composition rotating under the action of a magnetic field is supplied to the frontal parts of the windings and an electric current is passed through the winding after the end of the impregnation, due to the fact that, in order to improve the electrophysical characteristics of the windings by eliminating the flow composition, use impregnating composition, optionally containing fine ferromagnetic filler. 2. The method according to p. 1, about t l and h a-; (5) and, in order to increase the uniformity of the supply of the impregnating composition, the amplitude of the rotating magnetic field is changed according to a periodic law. ten 1 Editor B, Ivanova Order 4015/50 Tehred N. Bokkapo Proofreader Circulation 631 Subscription VNIIPI USSR State Committee for inventions and discoveries G13035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, st. Project, 4 . Z Compiled by V. A. Khvalkovsky Tehred N. Bokkapo Proofreader E. Sirohman