SLOT SEAL FOR AN ELECTRIC MACHINE

Abstract

An electric machine includes an active part having a slot, and a slot seal for sealing the slot. The slot seal includes a duct for guiding a fluid and an aperture configured to open the duct to an air gap of the electric machine and forming a nozzle designed to enable a phase change of the fluid.

Claims

1-12. (canceled)

13. An electric machine, comprising: an active part having a slot; and a slot seal for sealing the slot, said slot seal including a duct for guiding a fluid and an aperture configured to open the duct to an air gap of the electric machine and forming a nozzle designed to enable a phase change of the fluid.

14. The electric machine of claim 13, wherein the duct is in a same radial position as a scatter bar.

15. The electric machine of claim 13, wherein the slot seal has a first surface which faces the slot and a second surface which faces away from the slot and is configured to emit more thermal energy than the first surface, said second surface directed toward the air gap of the electric machine.

16. A method for cooling an electric machine, said method comprising: sealing slots of the electric machine with slot seals; guiding a fluid through a duct of at least one of the slot seals; and configuring the at least one of the slot seals with an aperture which opens the duct to an air gap of the electric machine and forms a nozzle designed to enable a phase change of the fluid for cooling the electric machine.

17. The method of claim 16, wherein the slots are formed in an active part of the electric machine.

18. The method of claim 16, wherein the duct is in a same radial position as a scatter bar.

19. The method of claim 16, wherein the at least one of the slot seals has a first surface which faces a corresponding one of the slots and a second surface which faces away from the slot and is configured to emit more thermal energy than the first surface, said second surface directed toward the air gap of the electric machine.

20. The method of claim 16, wherein the fluid is guided into the air gap of the electric machine.

21. The method of claim 17, wherein the active part is a rotor, and further comprising spraying the fluid onto the rotor.

22. The method of claim 16, wherein the method is simulated.

23. A computer program product, comprising: a computer-executable program; and a non-transitory storage device having stored thereon the computer-executable program that, when loaded into a processor of a computer facility and executed by the processor, causes the processor to perform the steps of sealing slots of the electric machine with slot seals, guiding a fluid through a duct of at least one of the slot seals, and configuring the at least one of the slot seals with an aperture which opens the duct to an air gap of the electric machine and forms a nozzle designed to enable a phase change of the fluid for cooling the electric machine, and/or simulate an electric machine comprising an active part having a slot, and a slot seal for sealing the slot, said slot seal including a duct for guiding a fluid and an aperture configured to open the duct to an air gap of the electric machine and forming a nozzle designed to enable a phase change of the fluid.

Description

[0027] The invention is described in more detail hereinafter with reference to diagrammatic exemplary embodiments. Elements of the same type are provided with the same reference characters.

[0028] it is shown in:

[0029] FIG. 1 a longitudinal section through an electric machine,

[0030] FIG. 2 a section through the electric machine of FIG. 1 according to a line II-II in FIG. 1,

[0031] FIG. 3 a further section through an electric machine,

[0032] FIG. 4 a top view of a slot seal,

[0033] FIG. 5 a further top view of a slot seal,

[0034] FIG. 6 a further top view of a slot seal, and

[0035] FIG. 7 a cross section of a slot seal.

[0036] FIG. 1 shows a longitudinal section through an electric machine 10. According to FIG. 1, the rotatory electric machine 10 has a rotor 2 and a stator 3 with a laminated stator core and winding heads 4. The rotor 2 is arranged on a rotor shaft 14. The rotor shaft 14 is mounted in bearings 15, so that the rotor shaft 14 can be rotated about an axis of rotation 16.

[0037] Insofar as the terms “axial”, “radial” and “tangential” are used, “axial” means a direction parallel to the axis of rotation 16. “Radial” is a direction orthogonal to the axial direction directly toward or away from the axis of rotation 6. “Tangential” is a direction which is both orthogonal to the axial direction and orthogonal to the radial direction. Tangential is therefore a direction which is directed in a circle around the axis of rotation 6 at a constant axial position and at a constant radial distance from the axis of rotation 16.

[0038] The laminated stator core has stator laminations 13. The laminated stator core has slots 12. These slots 12 are stator slots and run parallel to the axis of rotation 16 of the electric machine 10. They are arranged in a circle around the axis of rotation 16 (see FIG. 2).

[0039] FIG. 2 shows a section through the electric machine of FIG. 1 according to a line II-II in FIG. 1 with a laminated stator core 11. The stator slots 12 are initially open toward the axis of rotation 16 - that is to say, radially inward. The windings 9 of a stator winding system are arranged in the stator slots 12. The main sections of the windings 9 are arranged in the stator slots 12. Winding heads 4 of the windings 9 project, as is generally customary, according to FIG. 1 at the two axial ends of the laminated stator core beyond the laminated stator core 3. The slots 12 are sealed by slot seals 1, the slot seals 1 each having a duct 6.

[0040] FIG. 3 shows a further section through an electric machine with a stator 2 and a rotor 3. Teeth 8 are shown through which the slots 12 are formed. The teeth 8 have a scatter bar 7. The windings 9 are insulated from the teeth 8 by insulation 5 in the slot 12. The teeth 8 have grooves 17. Holding webs 18 of the slot seals 1, 1′ can engage in these grooves 17. Two slot seals 1 are shown by way of example in FIG. 3. In addition to holding webs 18, the slot seals 1 also each have a duct 6. The duct 6 of the slot seal 1′ has an aperture 19. Fluid 20 can escape from this aperture 19 into the air gap 21. As a result of the fluid 20 in the duct 6, thermal energy Q′, which is symbolized by an arrow 22 as a heat flow, can be carried out from the teeth or the stator, i.e. dissipated. The slot seal 1 has a first surface 24 and a second surface 25. The first surface 24 is smoother in comparison with the second surface 25. The second surface 25 is thus larger than the first surface 24 and can thus emit more thermal energy with regard to the surface structure.

[0041] The illustration according to FIG. 4 shows a top view of a slot seal 1 which has an aperture 19 which extends over the length of the slot seal 19 and is centered.

[0042] The illustration according to FIG. 5 shows a further top view of a slot seal 1 which has an aperture 19, the width 23, 23′ changes. As a result, the outlet volume of the fluid can be adjusted over the length.

[0043] The illustration according to FIG. 6 shows a further top view of a slot seal 1, with a plurality of apertures 19 which are at a different distance from one another. The outlet volume of the fluid can also be adjusted over the length as a result of this.

[0044] The illustration according to FIG. 7 shows a cross section of a slot seal 1. The slot seal 1 has holding webs 18 and a duct 6. The duct 6 has an aperture 19 which is designed as a nozzle. The aperture 19 tapers toward the outlet and thus forms the nozzle. The outlet direction of the fluid can be better determined by the nozzle, for example.