Laminated rotor balancing provisions

• US 9,325,218 B2
• Filed: 07/06/2011
• Issued: 04/26/2016
• Est. Priority Date: 07/06/2011
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (General Electric Company)
• Original Assignee: General Electric Company
• Inventors: Semenov, Dmitry Yurevich, Arrao, Anthony Salvatore, Avanesov, Mikhail Avramovich, Dawson, Richard Nils, Kazmin, Evgeny Victorovich, Schmehl, Timothy Gerald, Vinitsky, Yury Danilovich
• Primary Examiner(s): MULLINS, BURTON S
• Application Number:
  US13/822,767
• Publication Number:
  US 20140103754A1
• Time in Patent Office: 1,756 Days
• Field of Search: 310/51, 310/214
• US Class Current: 1/1
• CPC Class Codes: H02K 15/04 of windings, prior to mounting into machines insulating windings H02K15/10, H02K15/12
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32
• CPC Class Codes: H02K 3/487 Slot-closing devices
• CPC Class Codes: H02K 7/04 Balancing means

Abstract

A laminated rotor and an electric machine including the laminated rotor are disclosed. In an embodiment, a rotor comprises a plurality of stacked laminations, wherein each lamination includes a plurality of radially extending slots arranged about a circumference of each of the plurality of laminations, and the plurality of radially extending slots in successive laminations in the stack are aligned. A stud member passes longitudinally through at least one hole in the lamination stack, and a plurality of coils are positioned within the plurality of slots. Fewer than all of the plurality of slots have a coil positioned therein, leaving at least three slots empty. Balance members may be placed in the slots that do not have a coil positioned therein to balance the rotor.

Claims

1. A rotor comprising:

a plurality of axially stacked laminations,

wherein each lamination thereof includes a plurality of radially extending slots arranged about a circumference, and the plurality of radially extending slots in each lamination are aligned with the plurality of radially extending slots in the other axially stacked laminations;

a stud member passing longitudinally through at least one hole in the plurality of stacked laminations;

a coil stack positioned within fewer than all of the plurality of radially extending slots;

a balance member disposed in each radially extending slot in the plurality of radially extending slots that does not have a coil positioned therein;

a wedge disposed in each of the plurality of radially extending slots at a radially outward end thereof; and

a radially inward extending hole which extends through the wedge and at least partially through the balance member.

2. The rotor of claim 1, wherein a plurality of radially extending slots do not have a coil positioned therein, and wherein the plurality of radially extending slots that do not have a coil positioned therein comprises between 3 and n empty slots, where n=2*m₂, and m₂=a number of rotor winding phases.

3. The rotor of claim 2, wherein each slot in the plurality of radially extending slots that do not have a coil positioned therein is approximately evenly spaced from each other slot in the plurality of slots that do not have a coil positioned therein.

4. The rotor of claim 1, wherein each of the plurality of balance members further comprises steel.

5. The rotor of claim 1, wherein each of the plurality of balance members is removably affixed to a body of the rotor independently of each of the other balance members.

6. The rotor of claim 1, further comprising at least one balance load removably disposed in the radially inward extending hole.

7. The rotor of claim 6, wherein each of the at least one balance loads further comprises a threaded cylinder, and wherein at least a portion of an inner surface of the radially inward extending hole is threaded.

8. The rotor of claim 7, wherein each wedge retains one of a coil and a balance member, within a slot.

9. The rotor of claim 7, wherein each wedge comprises a non-metallic material.

10. An electric machine comprising:

a rotor including;

a plurality of axially stacked laminations,

wherein each lamination thereof includes a plurality of radially extending slots arranged about a circumference, and the plurality of radially extending slots in each lamination are aligned with the plurality of radially extending slots in the other axially stacked laminations;

a stud member passing longitudinally through at least one hole in the plurality of stacked laminations;

a coil stack positioned within fewer than all of the plurality of radially extending slots;

a balance member disposed in each radially extending slot in the plurality of radially extending slots that does not have a coil positioned therein;

a wedge disposed in each of the plurality of radially extending slots at a radially outward end thereof; and

a radially inward extending hole which extends through the wedge and at least partially through the balance member; and

a stator surrounding the rotor.

11. The electric machine of claim 10, wherein a plurality of radially extending slots do not have a coil positioned therein, and wherein the plurality of radially extending slots that do not have a coil positioned therein comprises between 3 and n empty slots, where n=2*m₂, and m₂=a number of rotor winding phases.

12. The electric machine of claim 11, wherein each slot in the plurality of radially extending slots that do not have a coil positioned therein is approximately evenly spaced from each other slot in the plurality of slots that do not have a coil positioned therein.

13. The electric machine of claim 10, wherein each of the plurality of balance members further comprises steel.

14. The electric machine of claim 10, wherein each of the plurality of balance members is removably affixed to a body of the rotor independently of each of the other balance members.

15. The electric machine of claim 10, further comprising at least one balance load removably disposed in the radially inward extending hole.

16. The electric machine of claim 15, wherein each of the at least one balance loads further comprises a threaded cylinder, and wherein at least a portion of an inner surface of the radially inward extending hole is threaded.

17. The electric machine of claim 16, wherein each wedge retains one of a coil and a balance member within a slot.

18. The electric machine of claim 16, wherein each wedge comprises a non-metallic material.

19. A rotor comprising:

a plurality of axially stacked laminations,

wherein each lamination in the plurality of stacked laminations includes a plurality of radially extending slots arranged about a circumference, and the plurality of radially extending slots in each lamination are aligned with the plurality of radially extending slots in the plurality of axially stacked laminations;

a stud member passing longitudinally through at least one hole in the plurality of stacked laminations;

a coil stack positioned within fewer than all of the plurality of radially extending slots;

a balance member disposed in each radially extending slot in the plurality of radially extending slots that does not have a coil positioned therein;

a wedge disposed in each of the plurality of radially extending slots at a radially outward end thereof;

a radially inward extending hole which extends through the wedge and at least partially through the balance member; and

at least one balance load removably disposed in the radially inward extending hole.