The various manufacturers of Mica tapes use polyester film as a substrate, mica paper as the primary insulation and a modified polyester or epoxy resin as a binder.
The mica paper consists of tiny platelets of mica that are made into a paper. This paper is extremely fragile and requires a carrier to render it usable, hence the polyester film. On some mica tapes the amount of binder applied is so small that without a film facing the mica platelets would flake away during application leaving only the polyester film.
These tapes are available for use in V.P.I. or in Resin Rich systems. With respect to corona and thermal resistance requirements mica has shown itself to be the most suitable insulating material.
These tapes can be applied to a conductor in various configurations i.e.
- Numbers of tapes.
- Percentage overlap.
- Stagger between tapes.
- A variety of thicknesses.
Special binders are introduced into certain mica tapes. These binders make it possible to consolidate form wound coil stacks under heat and pressure. This greatly simplifies the coil manufacturing process in that the stack is bonded allowing closely controlled sizes in the critical core area of the coil.
On machines with known high turn voltages or high incoming transient voltages configurations are available to significantly reduce this risk.
Mica tape covered conductors can be used in conjunction with Mylar® film.
Please contact our technical department for details.
® Du Pont registered trade name.
|
