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Squirrel cage rotor for a high-speed electrical machine with defined pressing surface disks
| Details |
Inventors: Ahrens, Markus; Prenner, Herbert;
Assignee: ABB (Schweiz) AG (Baden, CH)
Primary Examiner: Ramirez; Nestor
Assistant Examiner: Cuevas; Pedro J.
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis, L.L.P.
A rotor for a high-speed electrical machine is specified, which rotor is composed of a stack of several thick solid disks axially lined up next to one another, the solid disks having a defined pressing surface at their end faces, and tie rods passing through the stack in the axial direction in the region of the pressing surfaces. In this case, the tie rods press the solid disks against one another at the pressing surfaces. Furthermore, in order to save weight and material, a central, rotationally symmetrical recess adjoining the marginal region of each solid disk is provided on at least one end face of the solid disk. |
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DETAILED DESCRIPTION The object of the invention is therefore to specify a rotor for a high-speed electrical machine, which rotor is especially rigid at high speeds and in addition is constructed in a very simple and thus cost-effective and easy-to-maintain manner.
The rotor according to the invention has a stack of several thick solid disks which are lined up next to one another and have a defined pressing surface at their end faces.
Furthermore, tie rods pass through the stack in the axial direction in the region of and/or close to the pressing surface, the tie rods pressing the solid disks against one another.
As a result, an extremely rigid rotor assembly, which is necessary for high speeds, is obtained in an exceptionally advantageous manner.
Furthermore, the rotor has excellent flexural rigidity during thermal loads.
In addition, the solid disks can be produced in a very simple and cost-effective manner, for example by turning.
Furthermore, the pressing surfaces are advantageously located essentially in the marginal region and/or close to the marginal region of the end faces of the solid disks and are designed according to the invention essentially as annular surfaces, so that high flexural rigidity with at the same time low axial forces in the tie rods and thus especially smooth concentric running of the rotor are achieved in this region of the solid disks, which, is especially subjected to stress by centrifugal forces at high speeds.
In addition, due to these excellent concentric running properties, the shaft bearings of the rotor and of units to be driven which are coupled to shaft ends of the rotor will be subjected to considerably less wear.
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Generators or Motors 
