METHOD FOR JET IMPREGNATING COILS OF ELECTRIC MACHINES Russian patent published in 2014 - IPC H02K15/12 H02K15/02 

FIELD: electricity.

SUBSTANCE: when the winding is heated up to the preset temperature before impregnation current pulses with an amplitude within the range of (10-50)A and a pulse length of (0.5-10)s are supplied to the winding. Pulse repetition frequency is in the range of (5-10)Hz. Simultaneously with supply of the above pulses the infrared oscillator is connected to the magnet core of the winding. At that the frequency of sound oscillations of the infrasound source are varied constantly and cyclically within the frequency band from 0.5 kHz up to 10 kHz and back. When impregnation is over the infrasound frequency generator is disconnected from the magnet core, the source of current pulses is disconnected from the winding, direct or alternating heating current is supplied to the winding and by means of this current the impregnated winding is heated up to the polymerisation temperature of the impregnating compound and then the winding is dried until the impregnating compound is hardened completely.

EFFECT: reduction of impregnation time per 1,8 times and increase in impregnation coefficient per 1,8 times with simultaneous triple reduction of impregnation coefficient spread for each winding.

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