Electric machine, method for producing an electric machine, and hybrid-electric aircraft

Patent metadata

Field	Value
Publication number	US-11601028-B2
Application number	US-201917046296-A
Country	US
Kind code	B2
Filing date	Mar 22, 2019
Priority date	Apr 9, 2018
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

The electric machine comprises at least one winding (30) having at least one conductor (20) and electrical insulation for insulating one or more of the windings (30) and/or conductors (20), wherein the insulation is formed by a metal oxide. The method for producing such an electric machine having at least one winding (30) having at least one conductor (20) comprises the steps of metallizing the at least one winding (30) and/or conductor (20) with metal and oxidizing the metal. The aircraft is in particular an electric or hybrid-electric aircraft and has such an electric machine (10).

First claim

The invention claimed is:

1. An electric machine comprising:
at least one winding including:
at least one conductor;
first electrical insulation for insulating the at least one winding, the first electrical insulation including plastic material with a surface layer with a first metal oxide; and
second electrical insulation in the at least one conductor, the second electrical insulation including a second metal oxide.

2. The electric machine of claim 1 , wherein the at least one winding comprises at least one strand having the at least one conductor.

3. The electric machine of claim 2 , further comprising a sheath, the sheath including the first electrical insulation with the first metal oxide, or including a third electrical insulation with a third metal oxide.

4. The electric machine of claim 3 , further comprising a cooling circuit with a coolant path,
wherein the sheath forms part of the coolant path.

5. The electric machine of claim 3 , wherein the at least one strand, the sheath, or the at least one strand and the sheath have a cross-sectional contour that corresponds to a contour of the electric machine.

6. The electric machine of claim 3 , wherein the sheath is a tube or a hose with the first metal oxide or the third metal oxide.

7. The electric machine of claim 6 , wherein the sheath is a shrink hose with the first metal oxide or the third metal oxide.

8. The electric machine of claim 3 , wherein the sheath includes the first electrical insulation, and abuts and surrounds the at least one strand.

9. The electric machine of claim 3 , wherein the sheath includes the third electrical insulation, and abuts and surrounds the at least one conductor.

10. The electric machine of claim 2 , wherein the at least one conductor includes two or more conductors.

11. The electric machine of claim 1 , wherein the first metal oxide and the second metal oxide comprise aluminum, silver oxide, or aluminum and silver oxide.

12. The electric machine of claim 1 , wherein the at least one conductor has a triangular, quadrangular, or hexagonal cross-section.

13. The electric machine of claim 12 , wherein the at least one conductor has a rectangular cross-section.

14. The electric machine of claim 1 , wherein the first electrical insulation is formed with metal with a surface layer with the first metal oxide.

15. The electric machine of claim 1 , further comprising a surface insulating material with the plastic material.

16. A method for producing an electric machine having at least one winding with at least one conductor and electrical insulation for insulating one or more windings of the at least one winding, the method comprising:
metallizing a plastic material of the electrical insulation of the at least one winding with metal; and
oxidizing the metal, such that a surface layer of metal oxide is formed.

17. An aircraft comprising:
an electric machine comprising:
at least one winding including:
at least one conductor;
first electrical insulation for insulating the at least one winding, the first electrical insulation including plastic material with a surface layer with a first metal oxide; and
second electrical insulation in the at least one conductor, the second electrical insulation including a second metal oxide.

18. The aircraft of claim 17 , wherein the aircraft is an electric aircraft or a hybrid-electric aircraft.

19. An electric machine comprising:
at least one winding including:
at least one strand comprising at least one conductor and electrical insulation for insulating one or more windings of the at least one winding; and

a sheath with the metal oxide,
wherein the sheath is a shrink hose with the metal oxide.

Assignees

• Rolls Royce Deutschland Ltd & Co Kg

Inventors

• Hunter William
• Gröppel Peter
• Böhm Matthias
• Hubmann Joachim

Classifications

• B64D27/33

  Hybrid electric aircraft · CPC title

• H02K3/30 Primary

  Windings characterised by the insulating material · CPC title

• H02K3/04 Primary

  Windings characterised by the conductor shape, form or construction, e.g. with bar conductors · CPC title

• H02K15/105

  to the windings · CPC title

• H02K3/34

  between conductors or between conductor and core, e.g. slot insulation · CPC title