George M Lang

US Patent:

61449245, Nov 7, 2000

Filed:

May 20, 1996

Appl. No.:

8/650228

Inventors:

Martin Joseph Dowling - Norristown PA
George Fox Lang - Lansdale PA
Binish Praful Desai - Norristown PA
Louis Ricciuti - Darby PA

Assignee:

Crane Nuclear, Inc. - Kennesaw GA

International Classification:

G01R 2100
G06F 1900

US Classification:

702 60

Abstract:

A motor performance analyzer senses currents and voltages applied to the motor, converts the sensed signals to digital data signals, and stores the digital data signals. The analyzer includes a processor for evaluating the digital data and a display for alerting a user or technician to potential motor problems, or to developing problems, including winding faults and broken rotor bars. Advanced signal processing techniques are used to further evaluate stored data and to provide trending information.

US Patent:

62369474, May 22, 2001

Filed:

Jun 6, 2000

Appl. No.:

9/588811

Inventors:

Martin Joseph Dowling - Norristown PA
George Fox Lang - Lansdale PA
Binish Praful Desai - Norristown PA
Louis Ricciuti - Darby PA

Assignee:

Crane Nuclear, Inc. - Kennesaw GA

International Classification:

G01R 2100
G06F 1900

US Classification:

702 38

Abstract:

A motor performance analyzer senses currents and voltages applied to the motor, converts the sensed signals to digital data signals, and stores the digital data signals. The analyzer includes a processor for evaluating and comparing the digital data signals to predetermined values for voltage and current of the motor to determine and check for the correct placement of the current and voltage probes along corresponding phases of the motor. The analyzer also includes [and] a display for alerting a user or technician to potential motor problems, or to developing problems, including winding faults and broken rotor bars. [Advanced signal processing techniques are used to further evaluate stored data and to provide trending information. ].

US Patent:

54718805, Dec 5, 1995

Filed:

Apr 28, 1994

Appl. No.:

8/234192

Inventors:

George F. Lang - Lansdale PA
Robert L. Leon - Maple Glen PA

Assignee:

Electric Power Research Institute - Palo Alto CA

International Classification:

G01N 2912

US Classification:

73660

Abstract:

An improved method and apparatus for detecting and identifying one or more resonantly vibrating blades of a turbine through the use of acoustic sensors imbedded in the stationary casing of the turbine is disclosed. The acoustic sensor signals are processed to separate the characteristic Doppler waveform from the accompanying random noise and periodic noise. Improved signal processing techniques which involve the evaluation of both an information-bearing resonant signal and its Hilbert transform via direct synthesis are disclosed.

US Patent:

55214827, May 28, 1996

Filed:

Aug 22, 1994

Appl. No.:

8/293986

Inventors:

George F. Lang - Lansdale PA
David O. Heagerty - Glenn Mills PA
Glenn R. Kahley - Millville NJ

Assignee:

Liberty Technologies, Inc. - Conshohocken PA

International Classification:

H02P 900

US Classification:

318800

Abstract:

A method for determining electrical and mechanical performance of a polyphase electric motor system comprises sensing the instantaneous current signal and the instantaneous voltage signal as a function of time for at least one electrical phase of the motor. The sensed current signals and the sensed voltage signals are both processed to provide an instantaneous power factor of at least one electrical phase of the motor as a function of time. The resulting power factor is used to determine the tonal real and the total reactive power of the motor as a function of time. The total real power and the total reactive power signals are bandwidth limited and time-limited. The filtered and time-limited, total real power is then cross-plotted as a function of the filtered and time limited, total reactive power signal, generating a performance diagram. The mechanical performance characteristics of the motor are then extrapolated from the performance diagram.

US Patent:

63081407, Oct 23, 2001

Filed:

Jun 6, 2000

Appl. No.:

9/587827

Inventors:

Martin Joseph Dowling - Norristown PA
George Fox Lang - Lansdale PA
Binish Praful Desai - Norristown PA
Louis Ricciuti - Darby PA

Assignee:

Crane Nuclear, Inc. - Kennesaw GA

International Classification:

G06F 1900

US Classification:

702 60

Abstract:

A method of detecting broken rotor bars including sensing currents applied to the motor, converting the senses signals to digital data signals, and storing the digital data signals. A processor evaluates the digital data to provide a current signal spectrum at various selected sidebands. Sideband peaks having an amplitude within a predetermined value are identified, indicating potential motor problems or developing problems, including winding faults and broken rotor bars. Advanced signal processing techniques are used to further evaluate stored data and to provide trending information.