Vacuum Pressure Impregnation
The vacuum pressure
impregnation takes place after the stator has been wound, wedged,
connected and
the bracing system installed. VPI is the process developed by Westinghouse
decades ago for thorough
impregnation of the windings with epoxy resin that gives the premium epoxy
system its unmatched
quality. Epoxy
resins are ideal as impregnants because, in their cured solid state, they
are extremely tough, with
excellent resistance to both moisture and practically all types of
chemical contaminants encountered
in normal motor application environments. They are thermosetting and are
composed of 100%
solids. The VPI
process is a vacuum cycle followed by high positive pressure that forces
epoxy resin into all components
of the wound stator. The stator is preheated prior to VPI to drive off any
moisture that might
be present and baked afterwards to cure the resin. This entire cycle is
then repeated. After
cooling, the stator is coated with a highly durable, solvent-type epoxy
varnish producing a tough, smooth,
dirt-resistant surface.
Vacuum Pressure Impregnation for...
- Form wound stators and rotors
- Electrical switchgear
Thermalastic Insulation Epoxy Resin...
- made of 100% solids
- accommodates voltages
up to 15 KV
- excellent penetration
through mica tapes
- compatible with a wide
range of tape
- 40 KV/ MIL dielectric
strength @25 Deg. C
- high PSI Tensile
strength (1800 PSI @25 Deg. C)
- high resistance to
moisture
contact
us: sales@etimotors.com
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