Under variable frequency and high voltage, the polymer of the coil insulation paint film is prone to local ionization. When the electric field intensity reaches the critical field strength, local ionization occurs in the nearby gas, resulting in blue fluorescence and accompanied by discharge noise, while generating ozone. To prevent damage to the paint film caused by local ionization and improve the electrical aging performance of the paint, high resistance anti corona paint DFCJ1018 can effectively prevent the discharge and corona phenomenon of high-voltage motor stator coils.
Slightly damaged coil surface insulation treatment: In the damaged area located 50-220mm away from the iron core at the upper and lower ends of the coil (i.e. at the high resistance band position), apply high resistance anti corona paint DFCJ1018. The new high resistance layer needs to overlap with the original high resistance layer by no less than 5mm, but the distance from the beginning of the new high resistance layer to the end of the iron core should not be less than 50mm. For the coating area, use white tape to protect the surface of the outer wire rod to ensure that the coating surface is even and flat. After the anti-halo paint is cured, the surface is coated with RTV epoxy adhesive J0708, and then two layers of Tongma epoxy glass powder mica tape 5440-1 are semi laminated. The interlayer is coated with RTV epoxy adhesive J0708, with a binding length of 10mm at both ends of the newly applied high resistance length. After curing, the surface is coated with red insulating varnish.