Film-backed insulation (mylar) on 4kv+ motors?
Film-backed insulation (mylar) on 4kv+ motors?
(OP)
Does anyone have good or bad experience to report regarding the use of film-backed mica tape insulation in either strand, turn or groundwall insulation of motors rated 4kv and above?
This would include mylar, kapton, and polyester (not polyester resin... polyester backing).
I have heard that this type of material may be susceptible to degradation under voltage stress, disappearing and creating voids. Also doesn't permit global vpi resins to penetrate well?
This would include mylar, kapton, and polyester (not polyester resin... polyester backing).
I have heard that this type of material may be susceptible to degradation under voltage stress, disappearing and creating voids. Also doesn't permit global vpi resins to penetrate well?





RE: Film-backed insulation (mylar) on 4kv+ motors?
to over come the problem use mica / glass backed tape and close spiral tape, this will allow varnish penertration.
we have not had a problem with full pressed moulded coil systems.
suggest you contact jones stroued insulation systems uk.
kind regds.
RE: Film-backed insulation (mylar) on 4kv+ motors?
If I'm understanding your response correctly, the only problems you've seen with film insulation are on random wound machines... where it impeded the vpi impregnation.
Is it correct to assume that you've had favorable experience (impregnatiion) when film-backed insulation was used as strand/turn insulation for form-wound machines?
Thanks!
RE: Film-backed insulation (mylar) on 4kv+ motors?
we tend to be a bit old fashioned and follow proven methods.
kind regds.