Rotor for an electrical machine

• US 20050189835A1
• Filed: 02/15/2005
• Published: 09/01/2005
• Est. Priority Date: 08/16/2002
• Status: Active Grant

• Current Assignee: Alstom Technology Ltd. (Alstom SA)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: Drubel, Oliver
• Granted Patent: US 7,173,358 B2
• Time in Patent Office: Days
• US Class Current: 310/214
• CPC Class Codes: H02K 3/22 consisting of hollow conductors
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 3/48 in slots
• CPC Class Codes: H02K 3/487 Slot-closing devices

Abstract

A rotor for an electrical machine, including axial conductors for the rotor field windings inserted into axial slots in the rotor body and are secured against the forces which occur during operation by peripherally arranged means, wherein a single conductor is disposed in each slot. The conductor is preferably disposed upright in the axial slot.

Claims

1. A rotor for an electrical machine, comprising:

a plurality conductors forming rotor field windings; and

a rotor body including a plurality of slots for receiving the plurality of conductors, wherein not more than one conductor is disposed in each of the plurality of slots; and

at least one peripherally arranged element configured to secure the plurality of conductors in the plurality of slots against forces occurring during operation of the rotor.

2. The rotor as recited in claim 1, wherein each of the plurality of conductors has a width and a height, the width being less than the height.

3. The rotor as recited in claim 2, wherein a ratio of the width to the height of each conductor is from 1:

1.5 to 1;

5.

4. The rotor as recited in claim 3, wherein the ratio is from 1:

2 to 1;

4.

5. The rotor as recited in claim 1, wherein the at least one element includes one of a slot wedge disposed at the top of each slot and an at least one ring surrounding the rotor.

6. The rotor as recited in claim 1, wherein the at least one element includes at least one shrunk-on ring.

7. The rotor as recited in claim 1, further comprising a plurality of cooling slits disposed between the conductors and side walls of the axial slots, the cooling slits configured to enable a circulation of a cooling medium in at least one of an axial and a radial direction.

8. The rotor as recited in claim 7, wherein the cooling slits have a width from 0.5 to 1.5 cm.

9. The rotor as recited in claim 7, wherein the conductor includes at least one axially running cooling channel.

10. The rotor as recited in claim 9, wherein cooling channel has a width and a height, wherein the width is less than the height.

11. The rotor as recited in claim 9, wherein a total cross-sectional areas of the at least one axial cooling channel and the plurality of cooling slits one of the slots is at least 80 percent of a cross-sectional area of the conductor.

12. The rotor as recited in claim 1, further comprising at least one insulation element.

13. The rotor as recited in claim 12, wherein the at least one insulation element is a slot filling layer disposed in the slot.

14. The rotor as recited in claim 12, wherein the at least one insulation element is an insulating coating disposed on the conductor.

15. The rotor as recited in claim 12, wherein the at least one insulation element has a thickness of approximately 0.7 mm.

16. The rotor as recited in claim 1, wherein the conductor includes at least one of aluminum, copper, and an alloy containing at least one of aluminum and copper, and wherein the at least one peripherally arranged element includes at least one of a bronze and a nonmagnetic steel.

17. The rotor as recited in claim 1, further comprising a plurality of damper windings disposed in the slots.