Insulating paint for enameled wire and using method thereof

Abstract

The invention discloses an insulating varnish for an enameled wire and a using method thereof. The insulating varnish used in the present invention is 225 polyesterimide insulating varnish and 1766 polyamideimide insulating varnish, both of which have a temperature resistance of 200°C. It not only ensures that the product has a higher bonding strength but also ensures a higher temperature resistance index of the product. After mixing with a matching solvent to achieve a suitable viscosity, after coating, the enameled wire produced has been tested and has good adhesion. After stretching 20% ​​(national standard 15%), the insulating layer loses adhesion by no more than 1b. The breakdown voltage is stable, and the breakdown voltage can be stabilized at 4000-5500V.

Description

technical field [0001] The invention relates to the technical field of enameled wire production, in particular to an insulating varnish for enameled wires and a use method thereof. Background technique [0002] The principle of steam turbine generating current is that the rotor rotates to generate a magnetic field, and the stator bar cuts the magnetic field lines to generate current. The internal stator bar of the generator set is a key part of the motor, and at present, the stator bars of large and medium-sized steam turbines at home and abroad are mostly made of enamelled sintering wire. The most important performance of the enamelled sintering wire in the acceptance process is whether the electrical performance of the insulation layer of the product can meet the requirements. Due to the design requirements of the motor itself, this product mainly needs to rely on the paint film of about 10 wires of enameled wire for insulation protection. Due to the unstable voltage per...

AI Technical Summary

Problems solved by technology

Therefore, in order to improve the adhesion and voltage performance of the enameled wire, various domestic manufacturers began to use the original varnish of insulating varnish to configure the insulating varnish by adding other ingredients. However, due to poor control of the configuration ratio, the adhesion and voltage performance of the enameled wire still cannot be improved.