Electrical machine comprising radial cooling slots and wind turbine
An electrical machine includes a first active part and a second active part. Both the first active part and the second active part have a plurality of laminated sub-cores, with each laminated sub-core having a plurality of individual laminations. Each lamination is defined by an axial width. The laminated sub-cores are mutually spaced in an axial direction such that a respective radial cooling slot is formed between two adjacent laminated sub-cores. The radial cooling slots in the first active part are offset in the axial direction in relation to one another in comparison to the radial cooling slots in the second active part, and the sum of the axial widths of all individual laminations in the first active part corresponds to the sum of the axial widths of all individual laminations in the second active part.
1. An electrical machine, comprising:
a first active part having a plurality of laminated sub-cores in axially spaced-apart relation such as to form a radial cooling slot formed between two adjacent ones of the laminated sub-cores of the first active part; and
a second active part having a plurality of laminated sub-cores in axially spaced-apart relation such as to form a radial cooling slot between two adjacent ones of the laminated sub-cores of the second active part, with the radial cooling slots in the second active part being divided into first cooling slots of a first axial length and second cooling slots of a second axial length which is greater than the first axial length, said first and second cooling slots being arranged such that the second cooling slots are essentially arranged in a middle region of the second active part and distributed on both axial sides of a radially extending center plane, with the middle region corresponding to a hot area of the electrical machine,
wherein each of the laminated sub-cores of the first and second active parts includes a plurality of individual laminations, each lamination defined by an axial width, such that a sum of the axial widths of all individual laminations in the first active part corresponds to a sum of the axial widths of all individual laminations in the second active part,
wherein the radial cooling slots in the first active part are offset in an axial direction in relation to the radial cooling slots in the second active part,
said second active part comprising a cooling channel which extends in the axial direction and leads into the radial cooling slots in the second active part, with a coolant flow being introduced into the cooling channel at border areas of the second active part, said coolant flow being distributed to the radial cooling slots in the second active part and flowing via an air gap between the first active part and the second active part to the radial cooling slots of the first active part.
2. The electrical machine of claim 1 , wherein a number of individual laminations in the first active part essentially corresponds to a number of individual laminations in the second active part.
3. The electrical machine of claim 1 , wherein the axial width of all the individual laminations in the first active part is essentially the same as the axial width of all the individual laminations in the second active part.
4. The electrical machine of claim 1 , wherein a number of the radial cooling slots in the second active part is greater than a number of the radial cooling slots in the first active part.
5. The electrical machine of claim 1 , wherein the first active part comprises a plurality of grooves which each open into a surface of the first active part adjacent to the second active part, and further comprising a locking element introduced flush with the surface into each of the grooves.
6. The electrical machine of claim 5 , wherein the locking element is formed from a magnetic material or an amagnetic material.
7. The electrical machine of claim 1 , constructed in the form of an asynchronous machine including a squirrel-cage rotor or a slip ring rotor.
8. A wind turbine, comprising an electrical machine, said electrical machine comprising a first active part having a plurality of laminated sub-cores in axially spaced-apart relation such as to form a radial cooling slot formed between two adjacent ones of the laminated sub-cores of the first active part; and a second active part having a plurality of laminated sub-cores in axially spaced-apart relation such as to form a radial cooling slot between two adjacent ones of the laminated sub-cores of the second active part, with the radial cooling slots in the second active part being divided into first cooling slots of a first axial length and second cooling slots of a second axial length which is greater than the first axial length, said first and second cooling slots being arranged such that the second cooling slots are essentially arranged in a middle region of the second active part and distributed on both axial sides of a radially extending center plane, with the middle region corresponding to a hot area of the electrical machine, wherein each of the laminated sub-cores of the first and second active parts includes a plurality of individual laminations, each lamination defined by an axial width, such that a sum of the axial widths of all individual laminations in the first active part corresponds to a sum of the axial widths of all individual laminations in the second active part, wherein the radial cooling slots in the first active part are offset in an axial direction in relation to the radial cooling slots in the second active part, said second active part comprising a cooling channel which extends in the axial direction and leads into the radial cooling slots in the second active part, with a coolant flow being introduced into the cooling channel at border areas of the second active part, said coolant flow being distributed to the radial cooling slots in the second active part and flowing via an air gap between the first active part and the second active part to the radial cooling slots of the first active part.
9. The wind turbine of claim 8 , wherein a number of individual laminations in the first active part essentially corresponds to a number of individual laminations in the second active part.
10. The wind turbine of claim 8 , wherein the axial width of all the individual laminations in the first active part is essentially the same as the axial width of all the individual laminations in the second active part.
11. The wind turbine of claim 8 , wherein a number of the radial cooling slots in the second active part is greater than a number of the radial cooling slots in the first active part.
12. The wind turbine of claim 8 , wherein the first active part comprises a plurality of grooves which each open into a surface of the first active part adjacent to the second active part, said electrical machine comprising a locking element introduced flush with the surface into each of the grooves.
13. The wind turbine of claim 12 , wherein the locking element is formed from a magnetic material or an amagnetic material.
14. The wind turbine of claim 8 , wherein the electrical machine is constructed in the form of an asynchronous machine including a squirrel-cage rotor or a slip ring rotor.