Pulsed voltage surge resistant magnet wire

A pulsed voltage surge resistant magnet wire comprising a conductor, a continuous and concentric and flexible and uniform coat of base insulation material superimposed on said conductor, and an essentially continuous and concentric and uniform pulse voltage surge shield overlaying said coat of base insulation material said shield including a binder and an effective amount of particulate material to increase said pulsed voltage surge resistance of said shield by at least ten-fold in comparison testing at 20 kHz, less than 1 kV per mil, 50% duty cycle, from about 30.degree. to about 130.degree. C., and a rate of rise of about 83 kV per microsecond, said conductor and base insulation material and said shield all being in compliance with ANSI/NEMA MW1000 1993.

A magnet wire having a pulse voltage surge shield superimposed thereon for use in PWM, variable frequency and/or inverter driven motors, said shield including a binder and an effective mount of a particulate material to increase said pulsed voltage surge resistance of said shield by at least ten-fold in comparison testing at 20 kHz, less than 1 kV per mil, 50% duty cycle, from about 30.degree. to about 130.degree. C., and a rate of rise of about 83 kv per microsecond, said material having a particulate size ranging from about 0.005 to about 1 micron, said magnet wire with said shield being in compliance with ANSI/NEMA MW1000 1993.