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

Patent metadata

Field	Value
Publication number	US-2016226332-A1
Application number	US-201615005273-A
Country	US
Kind code	A1
Filing date	Jan 25, 2016
Priority date	Feb 3, 2015
Publication date	Aug 4, 2016
Grant date	—

Abstract

A method of protecting ferromagnetic lamination stacks of a component of an electric machine, comprises the following steps: creating a component module by arranging a laminations stack of ferromagnetic sheets into a housing, (b) protecting locations of the component module where coating is unwanted, (c) inserting the component module into a hermetic chamber receiving an ionized gas, (d) polarizing the component module to submit a fixed electric potential to the component module, (e) depositing a thin layer of protective coating on the laminations stack of ferromagnetic sheets 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 until desired thickness, and (g) rectifying the surface of the thin layer of protective coating to have a uniform protective layer.

First claim

What is claimed is:

1 . A method for protecting ferromagnetic lamination stacks of a component of an electric machine, comprising the following steps:
a) creating a component module by arranging a laminations stack of ferromagnetic sheets into a metallic housing, b) protecting locations of the component module where coating is unwanted, c) inserting the component module into a hermetic chamber receiving an ionized gas, d) polarizing the component module to submit a fixed electric potential to the component module, e) depositing a thin layer of protective coating on the laminations stack of ferromagnetic sheets 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 until desired thickness, and g) rectifying the surface of the thin layer of protective coating to have a uniform protective layer.

2 . The method according to claim 1 , further comprising a preliminary step consisting of preparing a surface of the component module before inserting the component module into the hermetic chamber receiving an ionized gas.

3 . The method according to claim 2 , wherein the preliminary step is accomplished using at least one micro sandblasting, shot blasting, skimming and chemical attack.

4 . The method according to claim 1 , wherein step of depositing the thin layer of protective coating creates the thickness of the protective coating that is between 5 micrometers and 50 micrometers.

5 . The method according to claim 1 , wherein step of depositing the thin layer of protective coating deposits protective coating made of an ultrapure silicon carbide coating.

6 . The method according to claim 1 , wherein step of depositing the thin layer of protective coating deposits protective coating made of a diamond like carbon coating.

7 . The method according to claim 1 , wherein step of arranging a laminations stack of ferromagnetic sheets is accomplished by one of gluing or stamping Si-Iron laminations.

8 . A component module of an electric machine comprising a stack of laminated ferromagnetic sheets provided in a metallic housing;
the stack of laminated ferromagnetic sheets comprising a thin layer of protective coating deposited on the stack of laminated ferromagnetic sheets through a method of Plasma Enhanced Chemical Vapor Deposition (PECVD); and the thin layer of protective coating having a rectified surface.

9 . The component module of claim 8 , wherein the thickness of the protective coating is between 5 micrometers and 50 micrometers.

10 . The component module according to claim 8 , wherein the protective coating is made of an ultrapure silicon carbide coating.

11 . The component module according to claim 8 , wherein the protective coating is made of a diamond like carbon coating.

12 . The component module according to claim 8 , wherein the laminations stack of ferromagnetic sheets is made of one of glued or stamped Si-iron laminations.

13 . The component module according to claim 8 , wherein the component constitutes one of a rotor or a stator of an active magnetic bearing.

14 . The component module according to claim 8 , wherein the component constitutes a one of rotor or a stator of a position sensor for an active magnetic bearing.

Assignees

• Baucé Yvon
• Carrasco Eduardo
• Salahun Erwan
• Skf Magnetic Mechatronics

Inventors

• Baucé Yvon
• Carrasco Eduardo
• Salahun Erwan

Classifications

• H02K15/12

  Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines · CPC title

• H01F41/0233

  Manufacturing of magnetic circuits made from sheets (magnetic cores made from sheets H01F27/245; soft magnetic alloys in the form of sheets H01F1/16) · CPC title

• H02K15/02

  of stator or rotor bodies · CPC title

• H02K5/12 Primary

  specially adapted for operating in liquid or gas (combined with cooling arrangements H02K9/00) · CPC title

• H01F3/02

  made from sheets · CPC title