COIL, ELECTRIC MACHINE, AND HYBRID-ELECTRIC AIRCRAFT

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.

Claims

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.

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

3. The coil winding of claim 2, further comprising: at least one additional pair, each additional pair having two further layers, wherein, for each additional pair, the electrical conductor extends to a first layer of the respective additional pair in a manner following the longitudinal extent, runs in an inwardly wound manner in the first layer of the respective additional pair, and then extends to a second layer of the respective additional pair and runs in an outwardly wound manner in the second 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. The coil winding of claim 1, wherein the at least two layers extend along a respective plane.

8. 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.

9. The electric machine of claim 8, further comprising: a cooling fluid path between the at least two layers.

10. 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.

11. The hybrid-electric aircraft of claim 10, further comprising: a cooling circuit.

12. The hybrid-electric aircraft of claim 10, wherein the hybrid-electric aircraft is a hybrid-electric airplane.

13. The coil winding of claim 2, wherein the two further layers extend along a respective plane.

14. The electric machine of claim 9, wherein the cooling fluid path is a cooling liquid path.

15. The electric machine of claim 8, 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 layer of the respective pair in a manner following the longitudinal extent, runs in an inwardly wound manner in the first layer of the respective pair, and then extends to a second layer of the respective pair and runs in an outwardly wound manner in the second layer of the respective pair.

16. The electric machine of claim 15, further comprising: a cooling fluid path between the two further layers of a respective pair and/or between pairs.

17. The electric machine of claim 15, further comprising: a cooling fluid path between the two further layers of each respective pair.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The disclosure will be discussed in more detail below on the basis of an exemplary embodiments illustrated in the drawings, in which:

[0024] FIG. 1 depicts a perspective illustration of a basic diagram of the topology of a coil winding according to an embodiment.

[0025] FIG. 2 depicts a perspective illustration of the coil winding according to an embodiment in accordance with FIG. 1.

[0026] FIG. 3 depicts a side view of the coil winding according to an embodiment in accordance with FIGS. 1 and 2.

[0027] FIG. 4 schematically shows a basic diagram of a hybrid-electric airplane having an electric machine having the coil winding according to an embodiment in accordance with FIGS. 1, 2, and 3.

DETAILED DESCRIPTION

[0028] The coil winding 100 shown in FIG. 1 includes a conductor W which will be described below in its profile, following its longitudinal extent, starting from its first connection end W1.

[0029] Starting from its first connection end W1, the conductor W runs inward along a planar spiral C1. The spiral C1 extends along a plane P1. In this case, the spiral C1 runs in such a way that the conductor W, along a plurality of turns of the spiral C1, bears respectively against its preceding turn. At an inner point of this spiral C1, the conductor W leaves the spiral C1 and extends in the direction perpendicular to the plane P1 toward a second plane P2 which extends parallel to the plane P1. The conductor W consequently extends along a section L which connects the planes P1 and P2. Within the plane P2, a spiral C2 which runs within the plane P2 and along which the conductor W passes out in a manner wound to the outside adjoins the section L. In this case, a respective turn of the conductor W bears against a preceding, inner turn of the conductor W, if present. After a certain number of turns, the conductor W leaves the spiral C2 and forms a second connection end W2.

[0030] The coil winding 100 has, as shown in FIG. 1, two external connection ends, specifically the first connection end W1 and the second connection end W2. As shown in FIGS. 2 and 3, the conductor W is a braided copper wire in the case of the coil winding 100. In further exemplary embodiments, not specifically illustrated, the conductor W is a single wire. As illustrated in FIG. 2, the coil winding runs in two layers which respectively run along the plane P1 or P2. The braided wire is wound in the form of a racetrack geometry within the individual layers P1 and P2. As indicated in FIG. 2, the braided wire is at least four times as wide in the direction of the planes P1 and P2 as in the direction perpendicular to these planes P1 and P2. The braided wire is twisted along the section L through 180 degrees about its longitudinal extent.

[0031] In further exemplary embodiments of coil windings 100, not specifically illustrated, one or more further pairs of two layers may be provided in addition to the two layers.

[0032] As a result of their distance d from one another, a cooling fluid path which allows areal cooling of the coil winding 100 is formed between the planes P1 and P2.

[0033] The hybrid-electric airplane 400 illustrated in FIG. 4 has an electric machine 410, in the illustrated exemplary embodiment an electric motor for driving a propeller 420. The electric machine 410 includes a stator having coil windings 100, the cooling fluid paths of which being part of a cooling circuit 430, as described above. Cooling liquid for cooling the coil windings 100 is conducted through the cooling fluid paths of the cooling circuit 430.

[0034] Although the disclosure has been described and illustrated more specifically in detail by the exemplary embodiments, the disclosure is not restricted by the disclosed examples and other variations may be derived therefrom by a person skilled in the art without departing from the scope of protection of the disclosure. It is therefore intended that the foregoing description be regarded as illustrative rather than limiting, and that it be understood that all equivalents and/or combinations of embodiments are intended to be included in this description.

[0035] It is to be understood that the elements and features recited in the appended claims may be combined in different ways to produce new claims that likewise fall within the scope of the present disclosure. Thus, whereas the dependent claims appended below depend from only a single independent or dependent claim, it is to be understood that these dependent claims may, alternatively, be made to depend in the alternative from any preceding or following claim, whether independent or dependent, and that such new combinations are to be understood as forming a part of the present specification.