Results are presented of comparative trials of insulation systems in traction motor armature impregnated by compounds using ultrasonic and vacuum-filling methods. The advantages of vacuum-filling impregnation are shown and the main trends in the revision of equipment and technology for the ultrasonic method are determined. Multiple experiments have shown that with correctly selected process parameters, vacuum-filling impregnation (VFI) insures the presence of the compound in insulation systems based on unimpregnated tapes of about 38 % to 42 %, as well as the extra saturation (by 4 % to 6 % on average) of insulation systems with preliminarily impregnated tapes, which supposes the construction of solid insulation structures with high functional qualities. Ultrasonic impregnation (USI), which is based on the ability of ultrasonic oscillations to expel air from capillaries while insuring the accelerated movement of impregnating compound along them, has recently been actively proposed as an alternative to VFI. USI can be implemented with smaller electric energy expenditures over a shorter period of time compared to VFI. At the same time, the effectiveness of VFI is assumed to be higher due to the more even distribution of impregnating compound over the volume, as well as to the absence of an accelerated increase in the thickness of the wall compound layer in capillaries, which prevents the full impregnation of the insulation system. These statements required experimental research. An analysis of the efficiency of impregnation methods was estimated by the following criteria: (1) Impregnation capacity of the frame, turn insulation, and half-packs of the insulation of coil windings (visual inspection); (2) percentage of resin in the frame insulation; (3) breakdown voltage of the frame insulation of armature coil windings before applying aging loads and after application in dry and moistened states. An additional visual inspection of the tested armatures during winding disassembly showed the equivalence of impregnation methods in terms of securing the saturation of the insulation of coil coverage with compound and the filling-in of hollows and cavities, which is unavoidable for the armature construction, as well as covering the surfaces of balancers and gaps between them.


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    Title :

    Insulation impregnation quality rating for electric motors windings by ultrasonic and vacuum-filling methods


    Additional title:

    Qualitätsbewertung für die Isolationsimprägnierung von Motorwicklungen mit dem Ultraschall- und Vakuum-Füllverfahren


    Contributors:

    Published in:

    Publication date :

    2009


    Size :

    3 Seiten, 1 Bild, 2 Tabellen, 3 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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