Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1995-11-17
1998-01-06
Maki, Steven D.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156245, 1562739, 1562742, 1562755, 156285, 427116, 174121SR, 174122C, 174124GC, H02K 1512
Patent
active
057050090
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The invention relates to a process for producing an insulation system for electrically conductive components having an insulating material, which is protected against partial discharge.
Such an insulation system is especially suitable for components of rotating electrical machines, the insulation systems of this kind known until now have been formed from strips of glass cloth that have a coating of mica. This reduced damage to the insulation system that is caused by partial discharges of electrical fields, for example in air inclusions in the insulation system. The cloth strips provided with the coating are wound around the components to be insulated. The solidification of the insulating material and its permanent bond to the component are effected with the aid of a resin.
In one known process, the strips are impregnated with the resin prior to being wound. The resin is dried before the winding and hardened after the winding. The hardening of the resin is effected by hot pressing in forming tools.
In another known process, the glass cloth strips, provided with the mica coating, are wound directly around the components to be insulated. The resin is then introduced into the insulation system by means of vacuum/pressure impregnation and is hardened thermally. Both processes are labor- and cost-intensive. In the latter process described, for technical production reasons, large amounts of liquid resin must be kept on hand and attended to, which represents a potential threat to work places and to the environment.
SUMMARY OF THE INVENTION
The object of the invention is to disclose a process with which an insulation system for electrically conductive components can be produced in an energy- and time-saving way as well as economically and in an environmentally friendly way, while circumventing the disadvantages referred to above.
This object is attained in accordance with the invention in that the insulating material is impregnated with a chemical compound, which is hardened by means of radiation polymerization or by radiation polymerization and the application of heat, or is hardened solely thermally, in order to solidify the insulation system and permanently bond it to the component.
In the process of the invention, an insulating material is first produced from a substrate material in the form of strips, sheets or mats. They are made from glass cloth, polyether ether ketone, polyethylene naphthalate, or polysulfone. The substrate material is provided on one or both sides with a coating of SiO.sub.x, Al.sub.2 O.sub.3, Cr.sub.2 O.sub.3 or mica, where x can assume a value of 2 or less. With the aid of this coating, damage to the insulation system which can be caused by partial discharges of electrical fields, for instance in air inclusions in the insulation system, is reduced. The insulating material is then impregnated with a chemical compound. This compound is chosen such that it can be hardened by means of radiation polymerization, or by means of radiation polymerization and the application of heat, or thermally alone. The chemical compound is chosen such that its polymerization can be activated by means of UV radiation or electron beam radiation. The activation of the polymerization is effected by means of UV radiation, which preferably has a wavelength between 200 nm and 500 nm. The use of electron beam radiation in a range between 150 keV to 4.5 MeV is also possible. According to the invention, the insulating material can also be impregnated with an organically modified ceramic. The organic ingredient of this ceramic comprises epoxy, acrylate or vinyl groups. The polymerization of the organic ingredient in the ceramic is likewise accomplished by radiation polymerization, with or without the application of heat, or solely by means of the application of heat. If the insulating material is impregnated with a modified ceramic, then it is optionally possible to omit a coating of the above-described type, since the ceramic itself is capable of reducing damage
REFERENCES:
patent: 4332836 (1982-06-01), Urban
patent: 4374066 (1983-02-01), Crivello
patent: 4418241 (1983-11-01), Fujiwara
patent: 5466492 (1995-11-01), Kiebling et al.
Baier Michael
Klee Peter
Oetzmann Henning
ABB Patent GmbH
Greenberg Laurence A.
Lerner Herbert L.
Maki Steven D.
Tolin Michael A.
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