Stephen W Cates

US Patent:

6933704, Aug 23, 2005

Filed:

Oct 11, 2002

Appl. No.:

10/270450

Inventors:

Robert J. Nelson - Orlando FL, US
Dennis Perttula - Orlando FL, US
Stephen Cates - Oviedo FL, US
Aaron Staley - Sanford FL, US

Assignee:

Siemens Westinghouse Power Corporation - Orlando FL

International Classification:

H02P009/30
H02P009/42
H02K007/10

US Classification:

322 29, 322 38, 322 39, 322 44, 322 63, 318718, 318811

Abstract:

A dynamoelectric machine combining the functions of an exciter, a turning motor, and a starting motor for a turbine. The machine operates in a first mode where the slip between a first stator winding and a first armature winding is positive and thus the magnetic fields interact and operate as a motor to turn the turbine. In a second mode the slip is negative as the turbine turns the shaft and the first stator winding and the first armature operate as an exciter for supplying excitation to the rotating field winding of a main generator.

US Patent:

7245030, Jul 17, 2007

Filed:

Dec 11, 2003

Appl. No.:

10/733739

Inventors:

Robert J. Nelson - Orlando FL, US
Stephen W. Cates - Oviedo FL, US

Assignee:

Siemens Power Generation, Inc. - Orlando FL

International Classification:

F02B 43/08
F02B 65/00
B60L 1/02
F01K 15/00
B61D 43/00

US Classification:

290 1A, 290 4 C, 290 40 A

Abstract:

An electrical power generating apparatus () may include a housing (), an electrical generator () within the housing, and a step-up transformer () within the housing and connected to the electrical generator. A turbine () may be provided exterior the housing () to drive the electrical generator (). A barrier wall () may be provided within the housing and () between the electrical generator () and the step-up transformer (), and a fire extinguishing system () may be installed within the housing (). The step-up transformer () may be connected to the electrical generator () without use of an isolated phase bus.

US Patent:

20050068058, Mar 31, 2005

Filed:

Sep 26, 2003

Appl. No.:

10/672770

Inventors:

Robert Nelson - Orlando FL, US
Aleksandar Prole - Winter Springs FL, US
Stephen Cates - Oviedo FL, US
Abraham Nieves - Orlando FL, US

International Classification:

G01R031/06
G01R031/34

US Classification:

324772000

Abstract:

Methods and systems consistent with the present invention provide improved online detection of one or more shorts in rotor turns () of a field winding () of an electric generator. An initial reference inductance Lis determined by an impedance-measuring circuit (). A subsequent inductance L is determined by the impedance measuring circuit (). A data processing system () compares Lto L to determine whether they differ by a predetermined amount. If Land L differ by the predetermined amount, an alarm is provided to operators to indicate the presence of one or more shorted rotor turns.