US 12,278,531 B2
Vacuum pressure impregnation method for insulation system
Jan de Swardt, Eustis, FL (US)
Assigned to The Timken Company, North Canton, OH (US)
Filed by The Timken Company, North Canton, OH (US)
Filed on Apr. 11, 2022, as Appl. No. 17/717,630.
Claims priority of provisional application 63/186,413, filed on May 10, 2021.
Prior Publication US 2022/0360153 A1, Nov. 10, 2022
Int. Cl. H02K 15/12 (2025.01); H02K 15/10 (2006.01)
CPC H02K 15/12 (2013.01) [H02K 15/105 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A vacuum pressure impregnation process comprising:
placing a room temperature electric machine coil/winding into a pressure vessel with a camera aimed at the coil/winding for inspection thereof;
sealing the pressure vessel and drawing a vacuum therein to a first vacuum level;
maintaining the vacuum at the first vacuum level for a first duration of time;
flooding the coil/winding with low viscosity epoxy or silicone resin and remotely monitoring at a location away from the pressure vessel with images provided by the camera;
drawing a vacuum in the pressure vessel to a second vacuum level and maintaining the vacuum at the second vacuum level for a second duration of time while remotely monitoring at a location away from the pressure vessel with images provided by the camera;
releasing the second vacuum level and applying a first positive pressure level in the pressure vessel for a third duration of time while remotely monitoring at a location away from the pressure vessel with images provided by the camera;
releasing the first positive pressure level and drawing a vacuum in the pressure vessel to a third vacuum level and maintaining the vacuum at the third vacuum level for a fourth duration of time while remotely monitoring at a location away from the pressure vessel with images provided by the camera;
releasing the third vacuum level and applying a second positive pressure level in the pressure vessel for a fifth duration of time while remotely monitoring at a location away from the pressure vessel with images provided by the camera;
releasing the second positive pressure level in the pressure vessel; and
removing the coil/winding from the pressure vessel,
wherein the coil/winding is not preheated before the step of flooding the coil/winding with low viscosity epoxy or silicone resin.