• NEWSLETTER 전기공업
• /
• no.94-7 s.104
• /
• pp.41-45
• /
• 1994

• Applied Chemistry for Engineering
• /
• v.4 no.2
• /
• pp.264-272
• /
• 1993

Current research aimed at investigating of heat-resistance of magnet wire to endow miniaturizing electronic equipment with a high efficiency or reliability. Thermal stability of magnet wire has a close relationship with physical properties of polymeric coating that is formed from enamel varnish. Design of heat-resistant enamel varnish and coating technology of varnish solution were briefly described. Some factors which have a thermal effect on wire were discussed through the evaluation method of the wire properties.

• NEWSLETTER 전기공업
• /
• no.91-26 s.39
• /
• pp.1-17
• /
• 1991

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.65 no.10
• /
• pp.1712-1720
• /
• 2016

AC and DC insulation breakdown voltage was studied for magnet wire coated with double layers of high flexural PAI layer and high anti-corona PAI/nanosilica (15 wt%) layer. The specimens were prepared at various drying temperatures (T/D): $22^{\circ}C$, $240^{\circ}C$, and $260^{\circ}C$, respectively. The increase effects of nanosilica on AC and DC insulation breakdown voltage were not so significant compared to that of magnet wire coil coated with original PAI. And the AC and DC insulation breakdown voltage was improved by decreasing diameter of winding coil. As T/D temperature increased, AC and DC insulation breakdown voltage decreased.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2009.11a
• /
• pp.151-151
• /
• 2009

A enameled wire may have better corona-resistance when its coating material contains nano-sized inorganic particles. However, industrial applications are still limited because an aggregation between nanofillers may happen during coating processes. In this study we use a novel scheme of surface modification with silane on silica nanoparticles using sonochemical reaction where composition and surface density of silanes can be controlled in order to reduce particle-particle attractive interaction. Functionalized nanoparticles are evenly dispersed in the matrix confirmed by SEM and energy dispersive x-ray analysis. Dielectric strength and thermal resistance of the nanocomposite wires are improved while flexibility of the wire maintains.