WINDING INSULATION FABRICATION TECHNIQUE FOR TRACTION MOTORS Russian patent published in 2014 - IPC H02K15/12 

FIELD: electricity.

SUBSTANCE: invention is related to the area of electric engineering and referred to winding insulation fabrication technique for electrical machines, mainly for traction motor armatures - direct-current machines. During impregnation with compound having viscosity of 70-100 s as per B3-4 dents and irregularities occur at bands. This is due to the fact that at high vacuum ≤1 mbar, upon vacuum degassing, compound filling and applying high pressure, there's no sufficient time for the compound to be penetrated to the winding under the band, in result pressure drop occurs between the external surface of the band and internal winding, additional pressurization of coils supports takes place thus leading to occurrence of dents and irregularities at the band surface. Dents at the band are no accepted as in this way they are spots for accumulation of dust, dirt, moisture, etc. According to the claimed technique the armature heated up to impregnation temperature is placed into the impregnating vessel and subjected to vacuum degassing; then the impregnating compound is delivered under vacuum. At that, according to the invention, in order to eliminate the above defects and to achieve the above technical result pressure is delivered gradually up to 6-8 bar during 15 minutes.

EFFECT: technical result attained due to this invention use lies in increase of electrophysical characteristics of insulation, water- and moisture-resistance of windings.

2 cl, 1 tbl