Donut stator core-frame attachment technique

Patent metadata

Field	Value
Publication number	US-9300172-B2
Application number	US-201314132011-A
Country	US
Kind code	B2
Filing date	Dec 18, 2013
Priority date	Dec 18, 2013
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A technique for securing a group of stator packs that are part of a stator core to construction bolts associated with a generator frame. The technique includes using a single wedge set to secure the group of stator packs to each construction bolt. Each wedge set includes a solid filler piece positioned within a groove on one side of a notch in the stator pack and a construction bolt filler piece having a convex shape portion configured to the shape of the construction bolt that accepts the construction bolt. A wedge member is forced between the filler pieces to secure the group of stator packs to the construction bolt.

First claim

What is claimed is:

1. A generator comprising:
a frame including a bore and a plurality of circumferentially disposed construction bolts mounted around and extending within the bore;
a plurality of stacked stator packs defining a stator core, each stator pack including a plurality of circumferentially disposed notches around an outer perimeter of the stator pack that align with notches in the other stator packs and form slots extending the length of the stator core, each notch including opposing side walls where one of the side walls is shaped to conform to the construction bolt in a mating engagement and the other sidewall includes a groove; and
a plurality of wedge sets for mounting the stator packs to the construction bolts, each wedge set including a solid filler piece configured to be positioned within the groove and a construction bolt filler piece having a shaped portion that conforms to the construction bolt, said wedge set further including a wedge piece positioned between the filler pieces and forcing the filler pieces apart to secure the stator packs to the construction bolt, wherein a single wedge set is provided within each notch.

2. The generator according to claim 1 wherein each wedge set secures four or five stator packs to the construction bolt.

3. The generator according to claim 1 wherein the stator packs are formed from a series of stacked rings where each ring includes a plurality of ring sections.

4. The generator according to claim 3 wherein the ring sections are stamped from a ferrous plate.

5. The generator according to claim 4 wherein the ferrous plate is a steel plate.

6. The generator according to claim 1 wherein the plurality of circumferentially disposed construction bolts is eighteen construction bolts.

7. The generator according to claim 1 wherein each stator pack includes an internal bore defining stator teeth and stator slots for accepting stator windings.

8. The generator according to claim 1 wherein each stator pack includes a raised portion proximate the notch.

9. The generator according to claim 1 wherein the generator is a high voltage generator configured to be coupled to a gas turbine engine.

10. The generator according to claim 1 wherein the generator includes thirty to thirty five stator packs.

11. A stator plate for a generator, said stator plate comprising a plurality of circumferentially disposed notches around an outer perimeter of the stator plate, each notch including opposing side walls where one of the side walls is shaped to conform to a cylindrical construction bolt and the other sidewall includes a rectangular groove.

12. The stator plate according to claim 11 wherein the groove is configured to accept a solid filler piece associated with a wedge set that secures the stator plate to the construction bolt.

13. A high voltage generator comprising:
a frame including a bore and a plurality of circumferentially disposed construction bolts mounted around and extending within the bore;
a plurality of stacked stator packs defining a stator core, said stator packs being formed from a series of stacked rings where each ring includes a plurality of ring sections where the ring sections are stamped from a ferrous plate, each stator pack including a plurality of circumferentially disposed notches around an outer perimeter of the stator pack that align with notches in the other stator packs and form slots extending the length of the stator core, each notch including opposing side walls where one of the side walls is shaped to conform to the construction bolt in a mating engagement and the other sidewall includes a groove, wherein each stator pack includes a raised portion proximate the notch; and
a plurality of wedge sets for mounting the stator packs to the construction bolts, each wedge set including a solid filler piece configured to be positioned within the groove and a construction bolt filler piece having a shaped portion that conforms to the construction bolt, said wedge set further including a wedge piece positioned between the filler pieces and forcing the filler pieces apart to secure the stator packs to the construction bolt, wherein a single wedge set is provided within each notch.

14. The generator according to claim 13 wherein each wedge set secures four or five stator packs to the construction bolt.

15. The generator according to claim 13 wherein the plurality of circumferentially disposed construction bolts is eighteen construction bolts.

16. The generator according to claim 13 wherein each stator pack includes an internal bore defining stator teeth and stator slots for accepting stator windings.

17. The generator according to claim 13 wherein the generator includes thirty to thirty five stator packs.

Assignees

• Dhekane Manish P
• Siemens Energy Inc

Inventors

• Dhekane Manish P

Classifications

• H02K15/021

  Magnetic cores · CPC title

• H02K15/022

  with salient poles · CPC title

• H02K15/02 Primary

  of stator or rotor bodies · CPC title

• H02K1/187 Primary

  to inner stators · CPC title

• H02K1/12 Primary

  Stationary parts of the magnetic circuit · CPC title