Process method for insulation attaching type bonding of large-scale motor rotor magnetic pole body

Abstract

The invention discloses a process method for insulation attaching type bonding of a large-scale motor rotor magnetic pole body. The method is an innovation of a large-scale motor rotor magnetic pole body insulation bonding method, and the bonding area is effectively increased through the ultra-flat treatment of the edge gaps between the magnetic pole punching sheets and the core-penetrating screwwelding holes. During wrapping, the insulation paper is wound at an included angle of more than 30 degrees with the surface of the pole body, and a smoothing scraper and a magnetic cake support are combined to form smoothing extrusion propulsion, so that bubbles generated in the insulation layer are effectively reduced. According to the invention, mold shaping treatment is adopted, so that pole body insulation bonding is tighter. The pole body is insulated, heated and cured, so that the coating glue is accelerated to be cured, the mold is removed as soon as possible, and the mold use efficiency is improved. And the angle insulation adopts a glue brushing treatment mode, so that the construction is time-saving and labor-saving. And the integrity of pole body insulation bonding is improved,and the quality stability of the pole body is ensured. The method is a novel technical scheme which is high in practicability, simple and convenient to operate, cost-reducing, efficiency-increasing and easy to popularize.

Description

Technical field: [0001] The invention relates to a process method for insulating and attaching a magnetic pole body of a rotor of a large motor. Background technique: [0002] With the production of large motors in recent years, the technology has been continuously innovated, and the structure has been improved. The insulation materials have also been updated day by day. The insulation of the poles of the rotor poles of large motors has changed from the original epoxy laminated board inlay structure to aromatic polyamide insulating paper wrapping and bonding. structure. The pole body insulation of the rotor pole of a large motor adopts an aromatic polyamide insulating paper wrapping and bonding structure, and the pole body insulation and the pole core are bonded into a whole. There are some new problems, that is, after the pole body insulation is wrapped and cured with aromatic polyamide insulating paper, it is unavoidable that a large number of bubbles appear in the cured ...

AI Technical Summary

Problems solved by technology

The pole body insulation of the rotor pole of a large motor adopts an aromatic polyamide insulating paper wrapping and bonding structure, and the pole body insulation and the pole core are bonded into a whole. There are some new problems, that is, after the pole body insulation is wrapped and cured with aromatic polyamide insulating paper, it is unavoidable that a large number of bubbles appear in the cured layer of aromatic polyamide insulating paper, which affects the overall insulation performance of the magnetic pole. There is no impact for the time being. After the magnetic poles are installed, they can pass various electrical test assessments and be sent to the site of the power station smoothly. However, the insulation resistance of the magnetic poles will become damp and lower after the magnetic poles are placed on site for a period of time. Requirements, when some magnetic poles do AC withstand voltage test on site, there will be a phenomenon that the insulation of the pole body will break down the voltage of the pole core

Through the dissection of the insulation of the pole body that has been broken down and broken down, it is found that the place where the magnetic pole core and the aromatic polyamide insulating paper has air bubbles will be oxidized by moisture and rust when stored in a humid environment, and the air bubble distribution of the two layers of aromatic polyamide insulating paper When it happens to overlap, it will form a corrosion indirect penetration channel. Use a megohmmeter to measure the insulation resistance of the magnetic poles. When the magnetic poles are subjected to AC withstand voltage tests at high voltages, the insulation of the magnetic poles will cause breakdown of the magnetic pole core.

From the analysis of the phenomenon, it is shown that a large number of air bubbles appear in the cured layer of the magnetic pole insulation aromatic polyamide insulating paper, which seriously affects the stability of the magnetic pole insulation performance.

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