Superconductive electric coil device and rotor comprising a coil device

1. An electrical coil device comprising:

a winding carrier which is formed from an elongate hollow tube and which is shaped in the manner of a ring, such that, overall, a superordinate loop of the coil device is formed by the ring shape of the winding carrier,

a winding which is applied to the winding carrier and which is composed of a superconductive conductor,

a coil axis, and

two axial coil members which extend parallel to the coil axis,

wherein the superconductive conductor is wound in a multiplicity of individual turns helically around the hollow tube, such that the ring shape of the winding carrier results in at least one superordinate turn of the overall helix, and

wherein the interior of the hollow tube is designed as a coolant channel for the circulation of a fluid coolant,

wherein, within the axial coil member, the superconductive conductor forms a local angle α of at most 79 degrees with the coil axis.

2. The coil device as claimed in claim 1 , further comprising:

in addition to the two axial coil members, two axially end-side connecting members which are each formed as straight members.

3. The coil device as claimed in claim 1 , further comprising:

in addition to the two axial coil members, two axially end-side connecting members which are each formed as bent members.

4. The coil device as claimed in claim 1 ,

wherein the hollow tube has a round cross-sectional shape.

5. The coil device as claimed in claim 1 ,

wherein the coil device is in the form of a coil device for an electric machine.

6. A rotor for an electric machine, comprising:

at least one coil device as claimed in claim 1 .

7. The rotor as claimed in claim 6 , further comprising:

a cooling system for cooling the superconductive conductor to a cryogenic operating temperature,

wherein the cooling system is configured to circulate the fluid coolant in the coolant channel of the coil device.

8. The rotor as claimed in claim 6 , further comprising:

a rotor core on which the at least one coil device is mechanically held, wherein the rotor core is designed to be kept at a warm operating temperature during the operation of the rotor.

9. The rotor as claimed in claim 8 ,

wherein the rotor core has at least one groove for receiving the coil device.

10. An electrical coil device comprising:

a winding carrier which is formed from an elongate hollow tube and which is shaped in the manner of a ring, such that, overall, a superordinate loop of the coil device is formed by the ring shape of the winding carrier, and

a winding which is applied to the winding carrier and which is composed of a superconductive conductor,

wherein the superconductive conductor is wound in a multiplicity of individual turns helically around the hollow tube, such that the ring shape of the winding carrier results in at least one superordinate turn of the overall helix, and

wherein the interior of the hollow tube is designed as a coolant channel for the circulation of a fluid coolant,

wherein the hollow tube has an inner diameter of at most 50 mm.

11. A rotor for an electric machine, comprising:

at least one coil device as claimed in claim 10 .

12. The rotor as claimed in claim 11 , further comprising:

a cooling system for cooling the superconductive conductor to a cryogenic operating temperature,

wherein the cooling system is configured to circulate the fluid coolant in the coolant channel of the coil device.

13. An electrical coil device comprising:

a winding carrier which is formed from an elongate hollow tube and which is shaped in the manner of a ring, such that, overall, a superordinate loop of the coil device is formed by the ring shape of the winding carrier, and

a winding which is applied to the winding carrier and which is composed of a superconductive conductor,

wherein the superconductive conductor is wound in a multiplicity of individual turns helically around the hollow tube, such that the ring shape of the winding carrier results in at least one superordinate turn of the overall helix, and

wherein the interior of the hollow tube is designed as a coolant channel for the circulation of a fluid coolant,

wherein the superconductive conductor comprises at least one strip conductor,

wherein the thickness of the strip conductor is at most 150 μm.

14. A rotor for an electric machine, comprising:

at least one coil device as claimed in claim 13 .

15. The rotor as claimed in claim 14 , further comprising:

a cooling system for cooling the superconductive conductor to a cryogenic operating temperature,

wherein the cooling system is configured to circulate the fluid coolant in the coolant channel of the coil device.

16. An electrical coil device comprising:

a winding carrier which is formed from an elongate hollow tube and which is shaped in the manner of a ring, such that, overall, a superordinate loop of the coil device is formed by the ring shape of the winding carrier, and

a winding which is applied to the winding carrier and which is composed of a superconductive conductor,

wherein the superconductive conductor is wound in a multiplicity of individual turns helically around the hollow tube, such that the ring shape of the winding carrier results in at least one superordinate turn of the overall helix, and

wherein the interior of the hollow tube is designed as a coolant channel for the circulation of a fluid coolant,

wherein the hollow tube has, at least in certain portions, a bend radius of less than 100 mm.

17. A rotor for an electric machine, comprising:

at least one coil device as claimed in claim 16 .

18. The rotor as claimed in claim 17 , further comprising:

a cooling system for cooling the superconductive conductor to a cryogenic operating temperature,

wherein the cooling system is configured to circulate the fluid coolant in the coolant channel of the coil device.