FIELD: electrical engineering; impregnating motor windings with insulating compounds, mainly varnishes. SUBSTANCE: novelty is using vacuum-pumping method involving sealing of stator frame inner space to change it into natural autoclave. Then vacuum is built up and impregnating varnish is delivered while maintaining this vacuum. As soon as varnish covers end windings, pressure up to 0.3 MPa is built up and upon pressure release varnish is drained, evacuation is repeated, and then stator frame is unsealed. EFFECT: facilitated procedure, reduced varnish consumption. 1 dwg, 1 tbl
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