Surge-Resistant Nanocomposite Enameled Wire Using Silica Nanoparticles with Binary Chemical Compositions on the Surface

Jeseung Yoo,Joohyun Lee,Suyong Kwon,Young-Soo Seo,Yongbeom Kim

doi:10.1155/2015/231672

Jeseung Yoo, Joohyun Lee + Show 3 more

Open Access

https://doi.org/10.1155/2015/231672

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Abstract

We developed polyesterimide (PEI) nanocomposite enameled wires using surface-modified silica nanoparticles with binary chemical compositions on the surface. The modification was done using silanes assisted by ultrasound, which facilitated high density modification. Two different trimethoxysilanes were chosen for the modification on the basis of resemblance of chemical compositions on the silica surface to PEI varnish. The surface-modified silica was well dispersed in PEI varnish, which was confirmed by optical observation and viscosity measurement. The glass transition temperature of the silica-PEI nanocomposite increased with the silica content. The silica-dispersed PEI varnish was then used for enameled wire fabrication. The silica-PEI nanocomposite enameled wire exhibited a much longer lifetime compared to that of neat PEI enameled wire in partial discharge conditions.

Highlights

Enameled wire is composed of conductive copper or aluminum core surrounded by an insulation layer made of polymer
In a high speed switching inverter-fed motor, especially, when instantaneous overlapping voltage called surge voltage is higher than partial discharge inception voltage (PDIV), the insulation layer is degraded by partial discharge (PD), which leads to insulation breakdown [1,2,3,4]
We found that the surface-modified silica nanoparticles were uniformly dispersed in PEI varnish

Summary

Introduction

Enameled wire is composed of conductive copper or aluminum core surrounded by an insulation layer made of polymer. In a high speed switching inverter-fed motor, especially, when instantaneous overlapping voltage called surge voltage is higher than partial discharge inception voltage (PDIV), the insulation layer is degraded by partial discharge (PD), which leads to insulation breakdown [1,2,3,4]. For this reason, surgeresistant enameled wire has attracted attention for prolonging the lifespan of various inverter-fed motor installed electric devices such as electric vehicles. The silica nanoparticle dispersed PEI varnish was applied for the nanocomposite enameled wires fabrication in commercial facilities. Surge resistance properties of the nanocomposite enameled wire were investigated

Experimental

Results and Discussion

Conclusions