US 7,732,958 B2Granted

Turbogenerator

AssigneeHitachi, Ltd.

InventorsAkihito Nakahara, Kazuhiko Takahashi, Kazumasa Ide, Mamoru Kimura

Life of this patent

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Abstract

A rotating shaft is required to have an overhang for the mounting of a generator for an AC-exciter, the shaft length being increased correspondingly. The overhang may become the cause of generating shaft vibrations. A turbogenerator has a rotor over which a field winding is disposed, a coupling co-cut from a rotor shaft, an AC exciter for supplying a DC current to the field winding through a rectifier, and a generator for the AC-exciter, the generator including a permanent magnet as a field generator and supplying a DC current to a field winding of the AC exciter through the rectifier. The AC exciter and the generator are disposed over the rotor shaft. The rotor is rotated through engagement between a turbine and the coupling. The generator for the AC-exciter is mounted in a position on the side nearer to the turbine than a stator of the turbogenerator.

Claims7

Dependent claims

A turbogenerator comprising:

a stator having an armature winding;
a rotor having a field winding;
a coupling monolithically formed with a shaft of said rotor;
a rotary rectifier;
an AC exciter for supplying a DC current to said field winding through said rotary rectifier;
a rotor bearing arrangement disposed at both sides of said shaft;
and
a sub-exciter having a permanent magnet as a field generator, supplying a DC current to a field winding of said AC exciter, being arranged between a rotor bearing and said coupling at one side of said shaft, a stator of said sub-exciter being split in the circumferential direction, and said AC exciter arranged at a side of said stator other than the same side as that of said sub-exciter,
wherein said stator, said rotor, said coupling, said rotary rectifier, said AC exciter, and said sub-exciter are arranged over said shaft of said rotor, and
a pedestal portion for mounting the sub-exciter to the shaft of the rotor, the shaft of the rotor, the coupling and the pedestal portion are monolithically formed of a unitary piece of material.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/206,767Filed 19 Aug 2005
Priority: JP 2004-37248124 Dec 2004
Published: US 2006/0138881 A129 Jun 2006
Granted: 8 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

F02C 7/268
Starting; Ignition: starting drives for the rotor , acting directly on the rotor of the gas turbine to be started
F01D 15/10
Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby: adaptations for driving, or combinations…
F02C
Gas-turbine plants
F01D
Non-positive displacement machines or engines