Electrical machine

• US 9,252,642 B2
• Filed: 10/22/2010
• Issued: 02/02/2016
• Est. Priority Date: 10/28/2009
• Status: Active Grant

• Current Assignee: Innomotics GmbH
• Original Assignee: Siemens AG
• Inventors: Bttner, Klaus, Danov, Vladimir, Rehme, Olaf, Schfer, Martin
• Primary Examiner(s): DESAI, NAISHADH N
• Application Number:
  US13/504,746
• Publication Number:
  US 20120205996A1
• Time in Patent Office: 1,929 Days
• Field of Search: 310/60.A, 310/61, 310/54, 310/57, 310/58, 310/64
• US Class Current: 1/1
• CPC Class Codes: H02K 15/00 Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
• CPC Class Codes: H02K 9/225 Heat pipes

Abstract

The invention relates to an electric machine (100) comprising a stator (107) and a rotor (101), wherein the rotor (101) comprises a hollow shaft (102), wherein a closed hollow space (103) is formed by means of the hollow shaft (102), wherein the closed hollow space (103) is provided for receiving a cooling agent, wherein a three-dimensional transport structure (200) is provided in the closed hollow chamber (103) for transporting the cooling agent. The three-dimensional structure can, for example, be produced by means of applying an adaptive material.

Claims

1. An electrical machine, comprising:

a stator;

a rotor having a hollow shaft configured to have a closed hollow space to accept a fluid; and

two three-dimensional transport structures provided in the closed hollow space to transport the fluid and rotatable about a longitudinal axis of rotation, wherein said three-dimensional transport structures include a first three-dimensional transport structure and a second three-dimensional transport structure and constructed so that due to their rotation in a specified direction said first three-dimensional transport structure transports the fluid in a first aggregate state close to the axis of rotation in a specified direction along the axis of rotation and said second three-dimensional transport structure transports the fluid in a second aggregate state remote from the axis of rotation, in an opposite direction, wherein said first and second three-dimensional transport structures are located radially one inside the other and extend substantially over the same length in the axial direction, wherein the first three-dimensional transport structure and the second three-dimensional transport structure correspondingly have a first plurality of vanes assuming a first vane position to transport the fluid in the first aggregate state in the specified direction and a second plurality of vanes assuming a second vane position to transport the fluid in the second aggregate state in the opposite direction.

3. The electrical machine of claim 1, wherein each of the three-dimensional transport structures is a member selected from the group consisting of a microscale structure, a nozzle-type grating structure, an open pore foam structure, and a spiral-shaped channel structure.

11. The electrical machine of claim 1, further comprising a filler provided in the hollow space of the hollow shaft and including the first and second three-dimensional transport structures.

12. The electrical machine of claim 1, wherein the hollow shaft includes the first and second three-dimensional transport structures.

13. The electrical machine of claim 1, further comprising a filler provided in the hollow space of the hollow shaft, wherein the hollow shaft includes the first three-dimensional transport structure, and the filler includes the second three-dimensional transport structure.

2. An electrical machine, comprising:

a stator;

a rotor having a hollow shaft configured to have a dosed hollow space to accept a fluid; and

two three-dimensional transport structures provided in the closed hollow space to transport the fluid and rotatable about a longitudinal axis of rotation, wherein said three-dimensional transport structures include a first three-dimensional transport structure and a second three-dimensional transport structure and constructed so that due to their rotation in a specified direction said first three-dimensional transport structure transports the fluid in a first aggregate state close to the axis of rotation in a specified direction along the axis of rotation and said second three-dimensional transport structure transports the fluid in a second aggregate state remote from the axis of rotation, in an opposite direction, wherein said first and second three-dimensional transport structures are located radially one inside the other and extend substantially over the same length in the axial direction, wherein the first three-dimensional transport structure and the second three-dimensional transport structure correspondingly have a first helical structure having a first coiling direction to transport the fluid in the first aggregate state in the specified direction and a second helical structure having a second coiling direction to transport the fluid in the second aggregate state in the opposite direction.

14. The electrical machine of claim 2, wherein each of the first and second helical structures is a member selected from the group consisting of a screw-type structure and a worm-type structure.

15. The electrical machine of claim 2, wherein each of the three-dimensional transport structures is a member selected from the group consisting of a microscale structure, a nozzle-type grating structure, an open pore foam structure, and a spiral-shaped channel structure.

16. The electrical machine of claim 2, wherein the hollow shaft includes the first and second three-dimensional transport structures.

17. The electrical machine of claim 2, further comprising a filler provided in the hollow space of the hollow shaft, wherein the hollow shaft includes the first three-dimensional transport structure, and the filler includes the second three-dimensional transport structure.

4. A method for the manufacture of three-dimensional transport structures to transport a fluid of a thermosiphon of an electrical machine, comprising an additive material coating step to form the two three-dimensional transport structures including a first three-dimensional transport structure and a second three-dimensional transport structure rotatable about longitudinal axis of rotation and constructed so that due to their rotation in a specified direction of rotation said first three-dimensional transport structure transports the fluid in a first aggregate state close to the axis of rotation in a specified direction along the axis of rotation and said second three-dimensional transport structure transports the fluid in a second aggregate state remote from the axis of rotation, in an opposite direction, and wherein said first and second three-dimensional transport structures are located radially one inside the other and extend substantially over the same length in an axial direction, wherein the first three-dimensional transport structure and the second three-dimensional transport structure correspondingly have a first plurality of vanes assuming a first vane position to transport the fluid in a first aggregate state in the specified direction and a second plurality of vanes assuming a second vane position to transport the fluid in a second aggregate state in the opposite direction, or have a first helical structure having a first coiling direction to transport the fluid in the specified direction and a second helical structure having a second coiling direction to transport the same another fluid in the opposite direction.

5. The method of claim 4, wherein the material is a metallic material.

6. The method of claim 4, wherein the additive material coating step is executed by a beam-based powder bed process.

7. The method of claim 4, wherein the additive material coating step is executed by a selective laser melting to be employed.

8. The method of claim 4, wherein the additive material coating step is executed on a shaft of an electrical machine.

9. The method of claim 8, wherein the additive material coating step is executed in a hollow space of the shaft.

10. The method of claim 4, wherein the additive material coating step is executed on a body provided for introduction into a hollow shaft of an electrical machine.