Improved thermal conductivity of anticorona insulation paint for high-voltage motor application

To develop the anticorona paint with high thermal conductivity is good way to reduce the temperature rise and heat accumulation in the stator bar for high-voltage motor application. In this study, boron nitride (BN) fillers with excellent insulating and high thermal conductivity were incorporated into the commercial anticorona paint. The thermal conductivity and electrical property of the BN-modified anticorona paints with various BN sizes and contents were systematically analyzed. The results show that two-dimensional BN fillers can block electric charge mobility and improve the resistivity of anticorona paint. The dielectric constant of 10 wt% 1 μm BN/anticorona paint is 50.11% higher than that of the neat anticorona paint due to the interface polarization. More importantly, the thermal conductivity of 10 wt% 1 μm BN/Anticorona paint reaches 1.162 W/(m·K), which is a significant improvement of 343.5% comparing to the neat anticorona paintis of 0.262 W/(m·K). This work demonstrates that BN/Anticorona paints with improved thermal conductivity and nonlinear conductivity have a great potential to be used in the stator bar for high-voltage motor application.