METHOD OF IMPREGNATING COILS OF ELECTRICAL MACHINES Russian patent published in 2014 - IPC H02K15/12 

FIELD: electricity.

SUBSTANCE: method of impregnating the multi-winding coil of an electrical machine involves feeding to the front parts of the coil a thin jet of a impregnating composition from a nozzle to the heated front part of the coil and rotating the jet along the front part of the coil. Before impregnation, fine ferromagnetic filler, which is pre-disintegrated, is added to the impregnating composition. The impregnating composition is mixed with the ground ferromagnetic filler; the obtained mixture is stirred and poured into the impregnating apparatus. Before impregnation, coil data are used to calculate the maximum mass of the impregnating composition m_im, which can be accommodated in the cavities of each of the same-type coils during impregnation. An electrode is inserted into the nozzle and potential is applied across the electrode. The process of impregnating each of same-type coils is then carried out. During the impregnation process, particles of the impregnating mixture of the compound with fine ferromagnetic powder are electrostatically charged. A jet is formed. Final compounding of the impregnating mixture that has penetrated the coil is then carried out.

EFFECT: method increases the impregnation coefficient of the coils by 1,55 times on average and improves stability thereof from coil to coil.

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