There are two available varnish processes for electric motors: Dip and Bake immerses a motor into a tank of varnish. Vacuum Pressure Impregnation (or VPI) is a process that places the motor into a chamber with a controlled atmosphere. The dip and bake method develops a hydro static pressure that dissipates many air voids and […]
Vacuum pressure impregnation enhances the life of electrical motor windings
Vacuum pressure impregnation, known as VPI, is a varnish process for electric motor insulation. The several-hour process begins with a prebake cycle to remove any moisture, the component is placed into the varnish chamber, a vacuum is pulled to remove air, varnish is introduced and the varnish chamber is pressurized. Computerized capacitance monitoring insures a […]