Application Of FEP Polyimide Film In Surbmersible Motor

Polyimide F46 /FEP film tape also known as "FH", "HFH" model,  insulation grade is H class.
Polyimide FEP film is manufactured coating on polyimide film with polyperfluoroethylene propylene on one or both sides.

The FEP (F46) emulsion is baked by high temperature, own excellent electrical insulation, thermal, mechanical performance, and has good high temperature resistant, radiation, chemical, oil, and warter resistant properties, besides, its characteristics of self-adhesive sealing is great.

With these good performance, Polyimide FEP film is well applied in flat winding coil wire, cable copper winding wire and high temperature thermistor for deep well submersible motor, and for insulation layer of electromagnetic wire and insulation of wrapped wires between layers of electrical machinery, etc.

It is mainly used for flat winding coils of submersible electric pumps and motors. It is generally made of flat copper bars with cross sections of 100-200 ㎡. Because the gauge is larger and its deformation force is larger, the turn-to-turn insulation material with higher bonding strength must be used. Only then can it be bonded together as a whole. For example, when insulating impregnating paint is used, because of its high viscosity and low solid content, ring workpieces often need to be impregnated several times to meet the insulation requirements, but also a large number of volatile solvents were producing at high boiling point. The baking process is also complex, which brings many difficulties to the application; and cost of impregnating lacquer-based resin is very high, which makes the price of the product is not competitve.

Developing of polyimide composite film can greatly reduce the waste of organic solvents and serious internal dyeing to the environment.

Insulation applied to flat copper wire and electromagnetic wire is thermoplastic F46 emulsion coated with polyimide film on one side or on both sides.

(Teflon FEP, can be used as a hot melt binder) After drying, a dry adhesive layer is formed and then sliced.

The insulating material is wrapped in strips on copper wires, heated and rolled so that the F46 adhesive layer on the polyimide film is firm.

Material and copper wire are bonded together as a whole. F46 adhesive layer can protect polyimide film from damage, but alone.

When polyimide film is used, the surface of the film is smooth and unbonded; when impregnating paint, the solvent evaporates and the adhesive is used.

There are too many bubbles in the layer, which reduces the bonding strength and sealability, thus affecting the insulation effect.