Modified Attachment System for Springs in a Generator Rotor

• US 20160352177A1
• Filed: 05/26/2016
• Published: 12/01/2016
• Est. Priority Date: 05/28/2015
• Status: Active Grant

• Current Assignee: Mechanical Dynamics & Analysis LLC (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Mechanical Dynamics & Analysis, Ltd.
• Inventors: ADAM, Andrew, ROBERTS, Mark
• Granted Patent: US 10,069,367 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 3/487 Slot-closing devices
• CPC Class Codes: H02K 3/527 applicable to rotors only

Abstract

An assembly for use in a rotor of a turbine generator is provided that includes at least one creepage disposed on an upper load surface of copper windings. At least one slot spring is disposed on the creepage, and at least one amortisseur is disposed on the slot spring. A plurality of hollow locking members are disposed within apertures of the creepage, the slot spring, and the amortisseur. At least one slot wedge is disposed on the slot spring and the plurality of hollow locking members. At least one field retaining ring is disposed against one of the end portions of the rotor body and against the slot wedge.

Claims

1. An assembly comprising:

a rotor body defining an internal slot and opposed end portions;

copper windings disposed within the internal slot of the rotor body, the copper windings defining internal gas passageways and an upper load surface;

at least one creepage disposed on the upper load surface of the copper windings, the creepage defining a plurality of apertures that are in alignment with the internal gas passageways of the copper windings;

at least one slot spring disposed on the creepage, the slot spring defining a plurality of apertures that are in alignment with the internal gas passageways of the copper windings;

at least one amortisseur disposed on the slot spring, the at least one amortisseur defining a plurality of apertures that are in alignment with the internal gas passageways of the copper windings;

a plurality of hollow locking members disposed within apertures of the creepage, the slot spring, and the amortisseur, the hollow locking members defining upper flanges that abut the slot spring;

at least one slot wedge disposed on the slot spring and the plurality of hollow locking members, the slot wedge defining a plurality of apertures that are in alignment with the internal gas passageways of the copper windings; and

at least one field retaining ring disposed against one of the end portions of the rotor body and against the slot wedge.

2. The assembly according to claim 1 further comprising three slot springs.

3. The assembly according to claim 2 further comprising two hollow locking members per slot spring.

4. The assembly according to claim 3, wherein the two hollow locking members are adjacent each other in successive apertures along the creepage, the slot spring, and the amortisseur.

5. The assembly according to claim 1 further comprising two field retaining rings, one at each opposed end of the rotor.

6. The assembly according to claim 1, wherein the apertures of the creepage, the slot spring, and the amortisseur through which the hollow locking members are disposed are larger than adjacent apertures that do not include the hollow locking members.

7. The assembly according to claim 1, wherein the hollow locking members define a woven glass material.

8. The assembly according to claim 1, wherein the hollow locking members define a chamfered inner bore.

9. A turbine generator having a rotor including the assembly of claim 1.

10. A method of repairing a rotor of a turbine generator comprising installing the assembly of claim 1.