Partial discharge resistant enameled wire

Accompanied with the prevalence of motors controlled by the inverter, the problem of surge voltage arising from the inverter has become intensified. The high frequency components of the inverter switching pulse voltage lead to the overvoltages due to the impedance of the cable between the inverter and the motor, and the insulating materials have been damaged by the partial discharges. In this study, we prepared an wire enamel hybridized with nano-scale inorganic particles, and investigated the properties of the enameled wire. By the uniform hybridization of a small amount of nano-scale inorganic particles to the wire enamel, the insulation breakdown time was improved by some ten times compared with that of the standard enameled wire, and it showed a good partial discharge resistance.