1556 East Airport Rd.
Price, UT 84501
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Conventional dipping is used in the reconditioning of a quality winding. After cleaning and testing, the winding is preheated to 125-150˚F to enable optimum penetration of the varnish into the windings, as well as the stator laminations.
Motors that have been previously dipped or VPI treated will not see a great deal of winding penetration. The heated winding is submerged in varnish and allowed to sit until all air bubbles cease to rise, indicating that all the air is out of the part. The winding is then raised above the varnish level and allowed to drain until no dripping of the excess varnish is observed.
We use EB 920, a high temperature electrical insulating varnish that exceeds Class H (180 ˚C) with a thermal rating up to 240 ˚C. It is a solvent-based polyester varnish which is thinned with Xylol thinner to proper viscosity. A sample of the varnish is routinely sent to the manufacturer for analysis to ensure our Customers the best possible product.
The purpose of dipping is to reinsulate the winding by providing an extra surface coating over the preexisting coating, which may have degraded, cracked, or worn due to the expansion and contraction that occurs during normal use.