Method of protecting lamination stacks of a component of an electric machine and component obtained by the method

摘要

A method of protecting ferromagnetic lamination stacks of a component of an electric machine, comprises the following steps:
a) creating a component module (10) by arranging a laminations stack of ferromagnetic sheets (11) into a housing (12),
b) protecting locations of the component module (10) where coating is unwanted,
c) inserting the component module (10) into a hermetic chamber receiving an ionized gas,
d) polarizing the component module (10) to submit a fixed electric potential to the component module (10),
e) depositing a thin layer of protective coating on the laminations stack of ferromagnetic sheets (11) through a method of Plasma Enhanced Chemical Vapor Deposition (PECVD) at a temperature lower than 150°C,
f) monitoring the deposition homogeneity and deposition thickness of the thin layer of protective coating (13) until desired thickness, and
e) rectifying the surface (14) of the thin layer of protective coating (13) to have a uniform protective layer.