FIELD: electrical engineering.
SUBSTANCE: invention relates to an electrical insulating material for a coil, the electrical insulating material being located between the stator core and the coil and being able to isolate the coil from the stator core. Expanding additional layer on the side of the stator core and the expanding additional layer on the coil side include foams foaming on heating. Foam included in the expandable additional layer on the side of the stator core has such a foaming characteristic that the characteristic of increasing the foaming rate from the temperature increase, is shifted towards lower temperatures with respect to the increase in the foam material included in the expanding additional layer on the coil side.
EFFECT: invention makes it possible to reduce the difference in the rate of foaming between the additional layer on the coil side and the side of the stator core.
1 cl, 9 dwg
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