Manufacture of coils for electrotechnical components using strips of unsealed anodized aluminum

Patent metadata

Field	Value
Publication number	US-10236120-B2
Application number	US-201414782763-A
Country	US
Kind code	B2
Filing date	Apr 3, 2014
Priority date	Apr 8, 2013
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

A method for manufacturing a strip of impregnated anodized aluminum, for use in a coil of an electrotechnical component, said coil including an interstitial material providing dielectric cohesion and insulation functions, said interstitial material being suitable for cross-linking, in other words for forming, by chemical reactions between the components thereof when subjected to certain physical conditions, molecular structures being organized in a lattice, the method comprising: a step of applying the precursor mixture of said interstitial material to the anodized aluminum; at least one step of cross-linking the precursor mixture in order to form said interstitial material on the strip of aluminum; wherein the anodized aluminum has not been subjected to the sealing of the pores of the alumina formed by anodization prior to the application of the precursor mixture of said interstitial material.

First claim

The invention claimed is:

1. A method for manufacturing a strip of impregnated anodized aluminum for use in a coil of an electrotechnical component, said coil comprising an interstitial material providing functions of cohesion and dielectric isolation, said interstitial material being obtained from a precursor mixture able to cross-link, said method comprising:
a step of anodizing a strip of aluminum to form a strip of anodized aluminum with an aluminum oxide layer which comprises pores,
a step of applying the precursor mixture of said interstitial material to the anodized aluminum,
at least one partial step of cross-linking the precursor mixture in order to form said interstitial material on the strip of anodized aluminum,
wherein the strip of anodized aluminum has not undergone sealing of the pores of the aluminum oxide layer from the step of anodizing the strip of aluminum, and
wherein the precursor mixture is in an intermediate state where the precursor mixture is gelled from the at least one partial step of cross-linking the precursor mixture.

2. The method according to claim 1 , wherein the precursor mixture comprises a resin and a hardener.

3. The method according to claim 2 , wherein at least one component chosen from polyepoxides, polyimides or silicones forms part of a formulation of the resin.

4. The method according to claim 2 , wherein the cross-linking step is incomplete such that the cross-linking is an intermediate heat treatment.

5. The method according to claim 1 , wherein the method comprises a step of storing the strip of anodized aluminum in an intermediate state at a low temperature.

6. The method according to claim 5 , wherein the low temperature is around −20° C.

7. A method for manufacturing an electrotechnical component comprising at least one coil, said at least one coil comprising a strip of anodized aluminum wound in turns and an interstitial material fulfilling functions of cohesion and dielectric isolation, wherein the strip of anodized aluminum is impregnated comprising:
a step of anodizing a strip of aluminum to form the strip of anodized aluminum with an aluminum oxide layer which comprises pores;
a step of applying a precursor mixture of said interstitial material to the strip of anodized aluminum;
at least one partial step of cross-linking the precursor mixture in order to form said interstitial material on the strip of anodized aluminum,
wherein the strip of anodized aluminum has not undergone sealing of the pores of the aluminum oxide layer from the step of anodizing the strip of aluminum,
the precursor mixture is in an intermediate state where the precursor mixture is gelled from the at least one partial step of cross-linking the precursor mixture; and
at least one step of definitive cross-linking of the precursor mixture in order to form said interstitial material on the strip of anodized aluminum is performed when the strip of anodized aluminum is formed to dimensions of the at least one coil.

8. The method according to claim 7 , wherein the at least one partial cross-linking step is incomplete before forming the strip of anodized aluminum to the dimensions of the at least one coil and subjecting the strip of anodized aluminum to the definitive cross-linking step.

Assignees

• Labinal Power Systems
• Safran Electrical & Power

Inventors

• Charlas Mathieu

Classifications

• H01F41/063

  with insulation · CPC title

• H01F41/04 Primary

  for manufacturing coils {(coils for transformer or inductances H01F27/28)} · CPC title

• C25D11/18

  After-treatment, e.g. pore-sealing · CPC title

• H01F41/061

  Winding flat conductive wires or sheets · CPC title

• H01F5/06 Primary

  Insulation of windings · CPC title