Squirrel cage rotor of an asynchronous machine

1. A squirrel cage rotor of an asynchronous machine, said squirrel cage rotor mounted for rotation about an axis and comprising:

a magnetically conductive main body;

a shaft having a bore for cooling the shaft;

short-circuit rings provided on end faces of the magnetically conductive main body and thermally linked to the shaft and to the magnetically conductive main body, each said short-circuit ring having a void embodying a radially operating thermosiphon dissipating heat in the shaft, said void delimited by radially and axially inclined surfaces forming evaporation and condensation surfaces for a coolant disposed inside the void; and

electrical conductors extending substantially axially in slots of the main body and electrically contacted by the short-circuit rings.

2. The squirrel cage rotor of claim 1 , wherein at least one member selected from the group consisting of the short-circuit rings and the main body is connected to the shaft in a torsion-proof manner.

3. The squirrel cage rotor of claim 1 , wherein the shaft includes a shaft cooling system.

4. The squirrel cage rotor of claim 1 , wherein the short-circuit rings are configured hollow such as to realize evaporation or condensation of the coolant in the void of the short-circuit ring.

5. The squirrel cage rotor of claim 4 , wherein the void of the short-circuit ring is bounded by a surface in facing relation to the end face of the magnetic main body and/or the shaft, said surface extending at a predetermined angle in relation to the axis or the end face.

6. An asynchronous machine, comprising a squirrel cage rotor as drive for a wheeled or track-based vehicle, for a maritime application, and as drive for aircraft, said squirrel cage rotor mounted for rotation about an axis and comprising a magnetically conductive main body, a shaft having a bore for cooling the shaft, short-circuit rings provided on end faces of the magnetically conductive main body and thermally linked to the shaft and to magnetically conductive main body, each said short-circuit ring having a void embodying a radially operating thermosiphon dissipating heat in the shaft, said void delimited by radially and axially inclined surfaces forming evaporation and condensation surfaces for a coolant disposed inside the void, and electrical conductors extending substantially axially in slots of the main body and electrically contacted by the short-circuit rings.

7. The asynchronous machine of claim 6 , wherein at least one member selected from the group consisting of the short-circuit rings and the main body is connected to the shaft in a torsion-proof manner.

8. The asynchronous machine of claim 6 , wherein the shaft includes a shaft cooling system.

9. The asynchronous machine of claim 6 , wherein the short-circuit rings are configured hollow such as to realize evaporation or condensation of the coolant in the void of the short-circuit ring.

10. The asynchronous machine of claim 9 , wherein the void of the short-circuit ring is bounded by a surface in facing relation to the end face of the magnetic main body and/or the shaft, said surface extending at a predetermined angle in relation to the axis or the end face.

11. A method for producing a squirrel cage rotor of an asynchronous machine, said method comprising:

Inserting electrical conductors into substantially axially extending slots of a magnetically conductive main body;

producing short-circuit rings with a void using a 3D printing process, sand casting, or sealing a cast one of the short-circuit rings by a cover such that the void embodies a radially operating thermosiphon dissipating heat in the shaft, said void delimited by radially and axially inclined surfaces forming evaporation and condensation surfaces for a coolant disposed inside the void; and

placing the short-circuit ring on end faces of the magnetically conductive main body such as to electrically contact the conductors.

12. The method of claim 11 , further comprising setting in the void of the short-circuit ring an operating pressure for an operating temperature of the asynchronous machine to establish an ideal operating point of coolant in the void of the short-circuit ring.

13. The method of claim 12 , wherein the operating pressure is a vacuum.