Gas-cooled turbogenerator

• US 6,037,683 A
• Filed: 11/18/1998
• Issued: 03/14/2000
• Est. Priority Date: 11/18/1997
• Status: Expired due to Term

• Current Assignee: General Electric Technology GmbH (GE Aerospace)
• Original Assignee: ABB Patent GmbH (ABB Limited)
• Inventors: Riedling, Yvonne, Lulay, Dieter
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): Lam, Thanh
• Application Number:
  US09/195,486
• Time in Patent Office: 482 Days
• Field of Search: 310/51, 310/52, 310/89, 310/90, 310/54, 310/58, 310/215, 310/64, 174/110 R, 174/187
• US Class Current: 310/52
• CPC Class Codes: H02K 3/12 arranged in slots
• CPC Class Codes: H02K 3/32 Windings characterised by the shape, form or construction of the insulation
• CPC Class Codes: H02K 9/10 by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing

Abstract

A gas-cooled turbo-generator has a pressure-tight casing with a stator disposed therein and a rotor. The turbo-generator also has cooling air feeders and dischargers disposed in the casing for circulating cooling air at a super atmospheric pressure in the casing. The stator and rotor have longitudinal slots for accommodating conductors and a proportion of conductor volume per longitudinal slot is at least twice a volume of the insulation. There is also provided an air/water heat exchanger for absorbing heat from the cooling air.

Claims

1. A gas-cooled turbogenerator, comprising:

a pressure-tight casing;

a stator disposed in said pressure-tight casing;

a rotor mounted in said pressure-tight casing, said stator and said rotor having longitudinal slots accommodating conductors surrounded by insulation, a proportion of a volume of each of said conductors per longitudinal slot is at least twice a volume of said insulation;

cooling air feeders and dischargers disposed in said pressure-tight casing for allowing cooling air at a super atmospheric pressure in said pressure-tight casing; and

air/water heat exchangers disposed in said pressure-tight casing for absorbing heat from the cooling air.

2. The turbogenerator according to claim 1, wherein said pressure-tight casing is a one-piece welded pressure vessel with end faces, said end faces having covers forming a gas-tight closure, and said rotor having shaft ends passing through said end faces.

3. The turbogenerator according to claim 2, wherein said covers each have an air-fed shaft seal.

4. The turbogenerator according to claim 3, wherein each of said air-fed shaft seal has an air chamber receiving compressed air to minimize an escape of the cooling air at a shaft gap.

5. The turbogenerator according to claim 1, wherein said stator has an internal diameter and said rotor is a standard rotor matched to said internal diameter of said stator.