Non-linear dielectrics used as electrical insulation for rotating electrical machinery

1. An electrical machine comprising:

a stator and rotor winding made of a conductive material; and

an insulating layer comprising at least one nonlinear ceramic filler comprising one of lead zirconate, lead hafnate, lead zirconate titanate, lanthanum-doped lead zirconate stannate titanate, and sodium niobate, said insulating layer is disposed around at least a portion of the winding having a dielectric constant that increases with increase in electric field intensity.

2. The electrical machine of claim 1 , the insulating layer comprising polymer composites.

3. The electrical machine of claim 2 , the polymer composites comprising polyetherimide, polyethylene, polyester, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, and polyvinylidene fluoride coploymers.

4. The winding of claim 1 , the insulating layer comprising a thermal conductivity of at least about 0.5 W/mK.

5. A stator and rotor winding of an electrical machine comprising a polymeric insulation system including at least one polymeric layer and at least one nonlinear ceramic filler comprising one of lead zirconate, lead hafnate, lead zirconate titanate, lanthanum-doped lead zirconate stannate titanate, and sodium niobate, said insulation system having a dielectric constant that increases with increase in electric field intensity.

6. The winding of claim 5 , wherein the dielectric constant increases with voltage.

7. The winding of claim 5 , the polymeric insulation system comprising polymer composites.

8. The winding of claim 7 , the polymer composites comprising polyetherimide, polycarbonate, polyethylene, polyester, polypropylene, epoxy, silicone, polytetrafluoroethylene, polyvinylidene fluoride, and polyvinylidene fluoride coploymers.