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AssigneesIsovolta Osterreichische Isolierstoffwerke Aktiengesellschaft, CKD Trakce A.S.
InventorsJosef Schorm, Otakar Zych, Gottfried Deutschmann
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In order to produce the electric insulation of the winding of an electric machine, grooves having a cross-section that tapers at least in an area near to the groove opening are arranged in the rotor or motor. Before the winding is laid in the grooves, the latter are lined with a laminate that contains an elastically compressed mass of high-elastic, electrically insulating fibres and a solidified, curable synthetic resin that can still be thermally softened, however, and that holds the mass of fibres in its compressed state. Once the winding is laid and the grooves are closed, the rotor or stator is subjected to a vacuum pressure impregnation, then cured. During the impregnation process, the hot saturating resin penetrates into the pores of the elastically expandable laminate, elastically expanding the mass of fibres and filling the empty spaces in the grooves, so that the elastically expanded mass of fibres, that is supported at the surface of the groove, exerts on the upper subconductor bundle of the winding a force in the direction of the bottom of the grooves.
A process for manufacturing the electrical insulation of the winding of an electric machine, said machine having a rotor and a stator, each of which having radially directed grooves with groove openings, which has winding sections or subconductor bundles placed with play in the grooves of the rotor or stator comprising providing grooves whose cross-section proximate to the groove opening, tapers in a radial direction inwardly towards the groove opening, inserting at least in the area proximate to the groove opening, a laminate which expands under heating into the gap-shaped space which forms between the groove surface and the winding sections, this laminate containing an elastically compressible, highly elastic fiber material as well as a solidified, curable synthetic resin, which can, however, be thermally softened and which maintains the fiber material in its compressed state, heating the laminate in order to soften the synthetic resin, whereupon the laminate expands because of the released tension on the compressed fibers and fills out the aforementioned gap-shaped space such that, in said area of the tapering groove cross-section, the elastically expanding fiber material exerts at least on an inserted winding section or a subconductor bundle a considerable component of force in the direction of the bottom of the groove, and hardening the synthetic resin at an increased temperature.
Dependencies are inferred from the claim text.