Coil, electric machine, and hybrid-electric aircraft

Patent metadata

Field	Value
Publication number	US-11979069-B2
Application number	US-201917251874-A
Country	US
Kind code	B2
Filing date	Jun 5, 2019
Priority date	Jun 15, 2018
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

The coil winding has an electrical conductor for an electrical machine and includes at least two layers. The electrical conductor, following its longitudinal extension, runs inwardly wound in a first of the at least two layers, and then extends to a second of the at least two layers and runs outwardly wound in the second layer. The electrical machine includes at least one such coil winding. The hybrid electric aircraft is in particular an airplane and includes such an electrical machine and/or at least one such coil winding.

First claim

The invention claimed is:

1. A coil winding comprising:
an electrical conductor for an electric machine; and
at least two layers,
wherein the electrical conductor, following a longitudinal extent of the electrical conductor, runs in an inwardly wound manner in a first layer of the at least two layers and then extends to a second layer of the at least two layers and runs in an outwardly wound manner in the second layer, and
wherein the at least two layers extend along a respective plane.

2. The coil winding of claim 1 , further comprising:
a pair with two further layers in which the electrical conductor extends to a first further layer of the pair in a manner following the longitudinal extent, runs in an inwardly wound manner in the first further layer of the pair, and then extends to a second further layer of the pair and runs in an outwardly wound manner in the second further layer of the pair.

3. The coil winding of claim 2 , further comprising:
at least one additional pair, each additional pair having two additional layers,
wherein, for each additional pair, the electrical conductor extends to a first additional layer of the respective additional pair in a manner following the longitudinal extent, runs in an inwardly wound manner in the first additional layer of the respective additional pair, and then extends to a second additional layer of the respective additional pair and runs in an outwardly wound manner in the second additional layer of the respective additional pair.

4. The coil winding of claim 1 , wherein the electrical conductor comprises a wire.

5. The coil winding of claim 4 , wherein the wire is a braided wire.

6. The coil winding of claim 1 , wherein the electrical conductor comprises at least one flat conductor.

7. An electric machine comprising:
at least one coil winding having:
an electrical conductor; and
at least two layers,
wherein the electrical conductor, following a longitudinal extent of the electrical conductor, runs in an inwardly wound manner in a first layer of the at least two layers and then extends to a second layer of the at least two layers and runs in an outwardly wound manner in the second layer; and

a cooling fluid path between the at least two layers.

8. The electric machine of claim 7 , wherein the cooling fluid path is a cooling liquid path.

9. The electric machine of claim 7 , wherein the coil winding of the electric machine further comprises at least one pair, each pair with two further layers in which the electrical conductor extends to a first further layer of the respective pair in a manner following the longitudinal extent, runs in an inwardly wound manner in the first further layer of the respective pair, and then extends to a second further layer of the respective pair and runs in an outwardly wound manner in the second further layer of the respective pair.

10. The electric machine of claim 9 , further comprising:
an additional cooling fluid path between the two further layers of a respective pair and/or between pairs.

11. The electric machine of claim 9 , further comprising:
an additional cooling fluid path between the two further layers of each respective pair.

12. A hybrid-electric aircraft comprising:
an electric machine having at least one coil winding, wherein the at least one coil winding comprises:
an electrical conductor; and
at least two layers,
wherein the electrical conductor, following a longitudinal extent of the electrical conductor, runs in an inwardly wound manner in a first layer of the at least two layers and then extends to a second layer of the at least two layers and runs in an outwardly wound manner in the second layer; and

a cooling circuit.

13. The hybrid-electric aircraft of claim 12 , wherein the cooling circuit comprises a cooling fluid path between the at least two layers of the at least one coil winding.

14. The hybrid-electric aircraft of claim 13 , wherein the cooling fluid path is a cooling liquid path.

15. The hybrid-electric aircraft of claim 12 , wherein the hybrid-electric aircraft is a hybrid-electric airplane.

16. The hybrid-electric aircraft of claim 12 , wherein the at least two layers of the at least one coil winding extend along a respective plane.

Assignees

• Rolls Royce Deutschland Ltd & Co Kg

Inventors

• Böhm Matthias
• Filipenko Mykhaylo
• Gleixner Thomas
• Gröppel Peter
• Lessmann Marc

Classifications

• B64D27/33

  Hybrid electric aircraft · CPC title

• H02K3/28 Primary

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• H02K15/0431 Primary

  Concentrated windings · CPC title

• H02K3/04

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

• B64D27/24

  using steam or spring force (jet aircraft B64D27/16) · CPC title