METHOD OF MAKING INSULATION FOR ELECTRIC MACHINE WINDINGS Russian patent published in 2013 - IPC H02K15/10 

FIELD: electricity.

SUBSTANCE: saturated mica-containing belts with binder fluidity of 20% are placed on bar windings at temperature of 20°C and pressure of 10 kgf/ cm² and binder gelling time of at least 10 minutes at 130°C. Press boards are placed on groove portions and flexible metal boards are placed on front portions. The windings are tied with jacketing tape (which simultaneously soaks excess saturating composition), after which a polyethylene or polypropylene sleeve is worn onto the bars. The sleeve is sealed. A set of bars prepared in this manner is placed on a loading frame and a connecting piece from each of the bars is connected to a vacuum collector. When the vacuum is turned on, air-tightness of the packed bars is checked. The frame is then put into a container in which air pressure of 8-10 kgf/cm² is created at room temperature. The container is then heated to 150-160°C and held at said pressure and temperature for 6-10 hours.

EFFECT: design of bar windings of electric machines of heat-resistance class H with improved electrical properties and stable dimensions on thickness.

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