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The resistance to partial discharges of pure, microfilled and nanofilled Polyetherimide varnish for low voltage motors fed by inverters is presented. Micro and nano-sized Silica particles (1.5 % wt) are used as fillers. Experimental results of lifetime versus temperature (-55 to 180°C), frequency (5 to 15 kHz) and level of the applied square voltage (+/- 1 kV to +/- 3 kV) clearly demonstrate that...
In the paper nanocomposites for turn insulation of inverter fed motors have been proposed. The results of the modifying both enamelled winding wires and impregnating varnishes with nanoparticles is shown. The presented nanocomposites offer a much longer lifetime then conventional insulation under pulse voltage generated by inverter due to barrier effect to partial discharges. Thermal and mechanical...
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