Manufacturing process of motor stator coils by vacuum pressure impregnation

Abstract

The invention relates to a manufacturing process for manufacturing motor stator coils by vacuum pressure impregnation, which comprises the following steps: after wrapping the main insulating layer of the motor bearing coil with less glue mica tape, the motor stator coils are subjected to vacuum pressure impregnation process, Fill the air gap between the micas with insulating varnish in advance, then carry out hot molding curing at 180°C to 200°C, and then insert them into the stator slot of the motor. After the connection is completed, perform a second hot molding curing at 155°C. The time for secondary thermal molding curing is not less than 10 hours. The high-voltage motor stator coil manufactured by vacuum pressure impregnation has a tight insulating layer structure, no air pockets, low dielectric loss increment, small partial discharge, and high dielectric breakdown field strength. The insulation performance, mechanical performance, temperature resistance and electrical aging resistance of the coil have been significantly improved, which has raised the coil quality to a higher level.

Description

technical field [0001] The invention relates to a manufacturing process for manufacturing motor stator coils through vacuum pressure impregnation. Background technique [0002] The traditional production process of the motor stator coil is that the main insulating layer is wrapped with epoxy powder mica tape, also known as less glue mica tape, and then enters the hot molding process. The mica layer generally has 9 to 13 layers. During the hot molding process, due to the obstruction of mica paper and epoxy glue, it is difficult for the air in these air gaps to escape, and air pockets are formed in the insulating layer. The main medium is air with a certain humidity, and its dielectric strength is far lower than that of the epoxy mica layer. Therefore, the existence of these air pockets greatly reduces the breakdown field strength of the insulating layer and affects the insulation performance of the motor stator coil. Contents of the invention [0003] The invention mainly ...

AI Technical Summary

Problems solved by technology

The mica layer generally has 9 to 13 layers. During the hot molding process, due to the obstruction of mica paper and epoxy glue, it is difficult for the air in these air gaps to escape, and air pockets are formed in the insulating layer. The main medium is air with a certain humidity, and its dielectric strength is far lower than that of the epoxy mica layer. Therefore, the existence of these air pockets greatly reduces the breakdown field strength of the insulating layer and affects the insulation performance of the motor stator coil.