Electric Conductor Comprising Multiple Filaments In A Matrix

1 . An electric conductor for producing a stator winding of a stator of an electric machine, the electric conductor comprising:

a plurality of filaments of a material normally conductive at 4.2 K; and

a normally conductive matrix material;

wherein the plurality of filaments are embedded in the matrix material to form a monolithic composite; and

the matrix material is more electrically resistive than the filaments.

2 . The electric conductor as claimed in claim 1 , wherein the material comprises aluminum as main component.

3 . The electric conductor as claimed in claim 2 , wherein the material of the filaments comprises highly pure aluminum with a residual resistance ratio of at least 1000.

4 . The electric conductor as claimed in claim 1 , wherein the matrix material has a higher tensile strength than the material of the filaments.

5 . The electric conductor as claimed in claim 1 , wherein the monolithic composite has a tensile strength of at least 10 N/mm 2 .

6 . The electric conductor as claimed in claim 1 , wherein the monolithic composite is produced by joint mechanical forming of the filaments and the matrix.

7 . The electric conductor as claimed in claim 1 , wherein the matrix material comprises at least one metal selected from the group consisting of: copper, aluminum, and copper/aluminum alloy.

8 . The electric conductor as claimed in claim 1 , wherein a specific conductivity of the matrix material is between 1×10 −7 Ωm and 2×10 −6 Ωm.

9 . The electric conductor as claimed in claim 1 , wherein the individual filaments are at least partially twisted with respect to one another.

10 . The electric conductor as claimed in claim 1 , wherein the plurality of filaments include at least 120 filaments.

11 . The electric conductor as claimed in claim 1 , wherein a diameter of the individual filaments is no more than 10 μm.

12 . The electric conductor as claimed in claim 1 , wherein each individual filament of the plurality of filaments is encased with a respective barrier layer;

wherein the barrier layer is more electrically resistive that the surrounding matrix material.

13 . A composite conductor comprising:

a plurality of electrical conductors, each electric conductor comprising:

a plurality of filaments of a material normally conductive at 4.2 K; and

a normally conductive matrix material;

wherein the plurality of filaments are embedded in the matrix material to form a monolithic composite;

the matrix material is more electrically resistive than the filaments; and

each electrical conductor is stranded with respect to one another.

14 . An electric machine comprising:

a rotor;

and a stator with a stator winding;

wherein the stator winding includes with at least one electric conductor comprising:

a plurality of filaments of a material normally conductive at 4.2 K; and

a normally conductive matrix material;

wherein the plurality of filaments are embedded in the matrix material to form a monolithic composite; and

the matrix material is more electrically resistive than the filaments.

15 . A method for producing an electric conductor, the method comprising:

running a matrix material and a plurality of filaments through a common mechanical forming to form

a monolithic composite between the plurality of filaments and the matrix;

wherein the plurality of filaments comprise a material normally conductive at 4.2 K;

the matrix material is normally conductive; and

the matrix material is more electrically resistive than the filaments.