METHOD TO IMPREGNATE WINDINGS OF ELECTRICAL APPLIANCES Russian patent published in 2013 - IPC H02K15/12 H02K15/02 

FIELD: electricity.

SUBSTANCE: winding and impregnating compound is heated up to impregnation temperature and submerged to one of winding faces into the impregnating compound. At that radial and longitudinal oscillations are excited in the bath with impregnating compound. Radial oscillations are generated by an ultrasonic source within low-frequency band of ultrasound which frequency id higher than the frequency of cavitation threshold within the band from 20 kHz up to 100 kHz and intensity of the above ultrasound is in the range of stable cavitation from 1.5 W/cm² up to 2.5 W/cm². Longitudinal oscillations are generated by an infrasound source and are varied constantly and cyclically within the frequency band from 0.5 kHz up to 10 kHz and back. When the impregnating compound appears at the other winding face the winding is removed from the compound and dried.

EFFECT: increasing performance of impregnation 3-5 times, ensuring stable quality of impregnation due to reduction of spreading of impregnation coefficients, increasing impregnation coefficient 1,5 times in average.