A process method for insulating and attaching the pole body of the rotor pole of a large motor

Abstract

The invention discloses a process method for insulating and attaching a magnetic pole body of a rotor of a large motor. It is an innovation in the method of insulating and bonding the rotor magnetic poles of large motors. Through the ultra-flat treatment of the gaps between the magnetic pole punches and the welding holes of the through-core screw, the bonding area is effectively increased. When wrapping, the insulating paper is used to wrap the surface of the pole body at an angle greater than 30 degrees, and the smoothing scraper and the magnetic cake support are combined to smooth and push forward, effectively reducing the generation of air bubbles in the insulating layer. The present invention adopts the mold setting treatment, and the insulation bonding of the pole and the body is tighter. Heat and cure the pole insulation to accelerate the curing of the coating glue, remove the mold as soon as possible, and improve the efficiency of the mold. The corner insulation adopts the treatment method of brushing glue, which saves time and effort in construction. Improve the integrity of the pole body insulation bonding to ensure the stability of its quality. The invention is a novel technical solution with strong practicability, simple and convenient operation, cost reduction and efficiency increase, and easy popularization.

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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