Stator of a turbo generator

• US 8,072,102 B2
• Filed: 07/16/2007
• Issued: 12/06/2011
• Est. Priority Date: 07/14/2006
• Status: Active Grant

• Current Assignee: Ansaldo Energia SPA
• Original Assignee: Ansaldo Energia SPA
• Inventors: Garello, Roberto
• Primary Examiner(s): Leung, Quyen
• Assistant Examiner(s): Kim, John K
• Application Number:
  US12/309,331
• Publication Number:
  US 20090322168A1
• Time in Patent Office: 1,604 Days
• Field of Search: 310/71, 310/179, 310/180, 310/184, 310/201
• US Class Current: 310/71
• CPC Class Codes: H02K 2203/06 Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations
• CPC Class Codes: H02K 3/22 consisting of hollow conductors
• CPC Class Codes: H02K 3/505 for large machine windings, e.g. bar windings H02K3/51 takes precedence
• CPC Class Codes: H02K 9/00 Arrangements for cooling or ventilating channels or ducts in parts of the magnetic circuit H02K1/20, H02K1/32; channels or ducts in or between conductors H02K3/22, H02K3/24
• CPC Class Codes: H02K 9/26 Structural association of machines with devices for cleaning or drying cooling medium, e.g. with filters

Abstract

A stator of a turbo generator for the generation of electrical energy is provided with: a cylindrical core, which extends along a longitudinal axis and presents a plurality of axial cavities and two opposite headers; connection terminals of the turbo generator; a plurality of electrical windings, which are split into groups and which extend along paths defined in part in the axial cavities and in part at the headers; the electrical windings of each group being isopotential and connected in parallel between a pair of terminals; and a plurality of connection devices, each of which is adapted to define, at least at one of the headers, a segment of path in common with the isopotential electrical windings.

Claims

1. A stator of a turbo generator, comprising:

a cylindrical core, which extends along a longitudinal axis and comprises a plurality of axial cavities and two opposite headers;

first connection terminals of the turbo generator configured to be connected to ground;

second connection terminals of the turbo generator configured to be connected to electrical power main;

a plurality of electrical windings, which are split into groups and which extend along paths defined in part in the axial cavities and in part at the headers;

the electrical windings of each group being isopotential and connected in parallel between the first and second connection terminals; and

a plurality of connection devices, each of which is adapted to define, at least at one of the headers, a segment of path in common with the isopotential electrical windings,

wherein the connection devices comprise;

terminal connection devices, each of which is connected to one of the first connection terminals or to one of the second connection terminals and defines a segment in common to the isopotential electrical windings of a group;

intermediate connection devices, each of which defines a segment in common to isopotential electrical windings of a group and are arranged in a median portion of the isopotential electrical windings; and

each group of isopotential electrical windings comprises in sequence a first terminal connection device;

at least two first conducting bars;

an intermediate connection device;

at least two second conductive bars; and

a second terminal connection device.

2. The stator according to claim 1, wherein each connection device comprises a hollow conductor.

3. The stator according to claim 2, wherein the hollow conductor is connected to a suction tube adapted to ventilate said hollow conductor.

4. The stator according to claim 2, wherein the hollowing conductor presents at least one end provided with a suction filter.

5. The stator according to claim 4, wherein the suction filter comprises a tube enclosed in a perforated plate.

6. The stator according to claim 2, wherein the connection device comprises at least one connector adapted to connect the hollow conductor to at least two bars.

7. The stator according to claim 6, wherein the connector comprises an elongated body provided with a hole adapted to be engaged by said hollow conductor and at least two fins each of which is adapted to be brazed to a corresponding bar.

8. The stator according to claim 7, wherein the connector comprises a first insulating shell arranged about the elongated body and the fins.

9. The stator according to claim 8, wherein the connector comprises a second shell arranged about the first shell.

10. The stator according to claim 7, wherein the elongated body presents a slot which extends between the hole and the fins.

11. The stator according to claim 2, wherein the intermediate connection device comprises two connectors arranged on the two opposite ends of the hollow conductor.

12. The stator according to claim 11, wherein the connection device comprises two filters arranged on the opposite ends of the hollow conductor.

13. The stator according to claim 12, further comprising a suction tube connected to the hollow conductor at the middle line of the hollow conductor.

14. A stator of a turbo generator, comprising:

a cylindrical core, which extends along a longitudinal axis and comprises a plurality of axial cavities and two opposite headers;

connection terminals of the turbo generator;

a plurality of electrical windings, which are split into groups and which extend along paths defined in part in the axial cavities and in part at the headers;

the electrical windings of each group being isopotential and connected in parallel between a pair of terminals; and

a plurality of connection devices, each of which is adapted to define, at least at one of the headers a segment of path in common with the isopotential electrical winding,

wherein each connection device comprises a hollow conductor having one end provided with a suction filter.

15. The stator according to claim 14, wherein the suction filter comprises a tube enclosed in a perforated plate.

16. A stator of a turbo generator, comprising:

a cylindrical core, which extends along a longitudinal axis and comprises a plurality of axial cavities and two opposite headers;

connection terminals of the turbo generator;

a plurality of electrical windings, which are split into groups and which extend along paths defined in part in the axial cavities and in part at the headers;

the electrical windings of each group being isopotential and connected in parallel between a pair of terminals; and

a plurality of connection devices, each of which is adapted to define, at least at one of the headers, a segment of path in common with the isopotential electrical winding,

wherein each connection device comprises a hollow conductor and at least one connector adapted to connect the hollow conductor to at least two bars.

17. The stator according to claim 16, wherein the connector comprises an elongated body provided with a hole adapted to be engaged by said hollow conductor and at least two fins each of which is adapted to be brazed to a corresponding bar.

18. The stator according to claim 17, wherein the connector comprises a first insulating shell arranged about the elongated body and the fins.

19. The stator according to claim 18, wherein the connector comprises a second shell arranged about the first shell.

20. The stator according to claim 17, wherein the elongated body presents a slot which extends between the hole and the fins.

21. A stator of a turbo generator, comprising:

a cylindrical core, which extends along a longitudinal axis and comprises a plurality of axial cavities and two opposite headers;

connection terminals of the turbo generator;

a plurality of electrical windings, which are split into groups and which extend along paths defined in part in the axial cavities and in part at the headers;

the electrical windings of each group being isopotential and connected in parallel between a pair of terminals; and

a plurality of connection devices including intermediate connecting device, each of which is adapted to define, at least at one of the headers, a segment of path in common with the isopotential electrical winding,

wherein each intermediate connection device comprises a hollow conductor and two connectors arranged on the two opposite ends of the hollow conductor.

22. The stator according to claim 21, wherein the intermediate connection device comprises two filters arranged on the opposite ends of the hollow conductor.

23. The stator according to claim 22, further comprising a suction tube connected to the hollow conductor at the middle line of the hollow conductor.