Patents Represented by Attorney Ann M. Kratz
  • Patent number: 5483436
    Abstract: A power supply for a gate drive voltage supply system for a power inverter is coupled to receive a variable DC voltage and operable to produce a regulated DC output voltage to each of a plurality of distributed electronic switching devices. The system includes a plurality of linear voltage regulators with each respective one of the regulators having a power input terminal coupled to a common DC link. Each of the regulators is separately connected to a ground reference at a ground reference power terminal of a corresponding one of the switching devices so as to eliminate ground loops and voltage drops over a common ground bus.
    Type: Grant
    Filed: August 30, 1993
    Date of Patent: January 9, 1996
    Assignee: General Electric Company
    Inventors: Herbert J. Brown, Philip R. Cooke, Donald D. Bock
  • Patent number: 5477163
    Abstract: A method for detecting turn faults in an induction motor comprises measuring at least two motor phase currents, at least two motor phase voltages, and the negative sequence impedance. Motor torque is estimated by employing the at least two motor phase currents and the at least two motor phase voltages. Motor pu slip is estimated by employing the motor torque. The motor pu slip is used to estimate the load variation effect on the negative sequence impedance. The negative sequence impedance is adjusted in accordance with the load variation effect, and it is determined whether the adjusted negative sequence impedance value indicates the presence of a turn fault.
    Type: Grant
    Filed: August 3, 1994
    Date of Patent: December 19, 1995
    Assignee: General Electric Company
    Inventor: Gerald B. Kliman
  • Patent number: 5467185
    Abstract: Respective SiC (silicon carbide) photodiode sensors are used to measure flame temperature at each cylinder of an internal combustion engine, and information generated by the SiC photodiode sensors is used to control the fuel injection in a feedback loop to control individual cylinder flame temperature and combustion.
    Type: Grant
    Filed: July 15, 1994
    Date of Patent: November 14, 1995
    Assignee: General Electric Company
    Inventors: William E. Engeler, Dale M. Brown
  • Patent number: 5463458
    Abstract: A Mach number sensor comprises a first pulse speed sensor situated in direct contact with an open area through which a first pressure pulse can pass and a second pulse speed sensor situated in a thermally conductive tube with membrane-covered ends having stationary air through which a second pressure pulse can pass. Each of the first and second pulse speed sensors may comprise two total internal reflection detectors and a timer for determining elapsed time for passage of the pressure pulse between the two detectors.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: October 31, 1995
    Assignee: General Electric Company
    Inventor: Ertugrul Berkcan
  • Patent number: 5449427
    Abstract: A method for processing a low dielectric constant material includes dispersing an additive material in a porous low dielectric constant layer, fabricating a desired electronic structure, and then removing the additive material from the pores of the low dielectric constant layer. The removal of the additive material from the pores can be accomplished by sublimation, evaporation, and diffusion. Applications for the low dielectric constant layer include the use as an overlay layer for interconnecting a circuit chip supported by a substrate and the use as printed circuit board material.
    Type: Grant
    Filed: May 23, 1994
    Date of Patent: September 12, 1995
    Assignee: General Electric Company
    Inventors: Robert J. Wojnarowski, Herbert S. Cole, Theresa A. Sitnik-Nieters, Wolfgang Daum
  • Patent number: 5442953
    Abstract: A dynamic profiling system for measuring a profile of an outer surface of a moving motor component such as a commutator includes a movable probe assembly having a profile detecting probe and a probe cooling system for circulating a cooling liquid about the probe. The probe cooling system maintains the cooling liquid at a fixed temperature during circulation of the liquid. The detecting probe obtains profile measurement data from the outer surface of the rotating motor component when the motor component is at ambient and hot temperatures. Additionally data is collected while the commutator is rotating up to 4000 revolutions per minute. The system further includes a controller, an analog to digital converter for receiving and converting the data, and a monitor for displaying information processed by the controller.
    Type: Grant
    Filed: October 21, 1993
    Date of Patent: August 22, 1995
    Assignee: General Electric Company
    Inventors: William D. Fisher, Robert H. Hartmann
  • Patent number: 5436442
    Abstract: An optical detection system includes an array of photodetectors, each of which is positioned for receiving light and converting the light into an electrical signal. A plurality of high pass filters is positioned with each one of the high pass filters electrically coupled to a respective photodetector for passing a portion of a respective electrical signal having frequency components at least as high as the high pass filter cutoff frequency. In one embodiment, each one of the filters comprises a capacitance coupled to the photodetector and a depletion mode FET with shorted gate-to-source terminals coupled between the photodetector and a bias voltage source.
    Type: Grant
    Filed: September 22, 1993
    Date of Patent: July 25, 1995
    Assignee: General Electric Company
    Inventors: Gerald J. Michon, Harold W. Tomlinson, Jr., Jerome J. Tiemann
  • Patent number: 5401959
    Abstract: An optical temperature compensation system for spectral modulation sensors comprises a light director for receiving excitation light and a spectral modulation sensor for receiving a first portion of the excitation light from the light director. A source monitoring component is positioned for receiving a second portion of the excitation light from the light director. The source monitoring component includes offset optics optically coupled to the light director, a source dichroic filter for splitting the light from the offset optics, a first source photodetector for receiving wavelengths above the effective cutoff wavelength of the source dichroic filter, and a second source photodetector for receiving wavelengths below the effective cutoff wavelength of the source dichroic filter.
    Type: Grant
    Filed: September 8, 1993
    Date of Patent: March 28, 1995
    Assignee: General Electric Company
    Inventor: Ertugrul Berkcan
  • Patent number: 5401958
    Abstract: An optical temperature compensation system for spectral modulation sensors includes a light director for receiving excitation light, a spectral modulation sensor for receiving and modulating a first portion of the excitation light from the light director, and an optical processing component for receiving and determining properties of a second portion of the excitation light from the light director and the modulated first portion of the excitation light. The optical processing component comprises a dispersive element for dispersing the second portion of the excitation light and the modulated first portion of the excitation light and a charge transfer device for converting the dispersed portions of light into electrical signals. A digital signal processor calculates a detected ratio of the electrical signals which compensates for inaccuracies in measurement due to source temperature variations.
    Type: Grant
    Filed: September 8, 1993
    Date of Patent: March 28, 1995
    Assignee: General Electric Company
    Inventor: Ertugrul Berkcan
  • Patent number: 5399866
    Abstract: An imaging system responsive to focused laser light includes a focusing lens for focusing the laser light and a mirror having a reflective side, a non-reflective side, and a hole for passing a predetermined portion of the laser light from the focusing lens through the non-reflective side. A fiber probe excites and couples fluorescence from an analyte. The fiber probe has a fiber front face for receiving laser light through the hole and for directing the fluorescence to the reflective side of the mirror. Optical devices for imaging the portion of the fluorescence reflected by the mirror to form an image of the fiber front face are provided, as well as an optical stop having an aperture in the image plane of the imaging means for reducing undesired light from the imaging means before reaching a detector. The mirror is angled for directing substantially all fluorescence from the the fiber probe into the imaging means rather than back toward the fiber probe.
    Type: Grant
    Filed: March 24, 1993
    Date of Patent: March 21, 1995
    Assignee: General Electric Company
    Inventors: Sandra F. Feldman, Carl M. Penney
  • Patent number: 5398404
    Abstract: A method for brazing end rings to rotor bars for a squirrel cage rotor assembly comprises assembling the rotor in a brazing fixture with a braze shim between the rotor bars and the end rings; preheating the rotor and brazing fixture to a temperature that is below the aged temperature of the rotor bars and end rings and which is sufficiently high so that the difference in thermal expansion of the rotor bars and brazing fixture applies a predetermined amount of pressure on the brazing joint such that after the joint is brazed and has cooled, a braze filler having a predetermined thickness inches will bond the rotor bar end faces to the end ring, and brazing each joint to bond the rotor bar end faces to the end ring.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: March 21, 1995
    Assignee: General Electric Company
    Inventors: James A. Meyer, Paul L. Flynn, James Kobrinetz, Anthony W. Giammarise, James M. Nuber, Shaun P. Luther, Jr.
  • Patent number: 5394720
    Abstract: Apparatus for forming a form wound stator coil from a bobbin has means for clamping the straight portions of the bobbin to define the straight portions of the each leg of the coil. It also has means for bending the bobbin to predetermined radii to form arms extending from the straight portions of each leg of the coil to each nose of the coil. Means are provided for bending each arm to a predetermined radius. Means are further provided for bending the nose portions to a predetermined angle. Means for providing a drop to the arm portions of the coil relative to the stator bore are also provided. Means for forming the leads of the bobbin to a predetermined configuration are also provided. Hydraulic means for powering the apparatus and a system for controlling the hydraulic means are also disclosed.
    Type: Grant
    Filed: February 24, 1994
    Date of Patent: March 7, 1995
    Assignee: General Electric Company
    Inventors: Robert H. Hartmann, James A. Guerrein
  • Patent number: 5391233
    Abstract: The present invention is directed to a process for coating the interior surfaces of an orifice in a substrate that forms a slurry fuel injection nozzle. In a specific embodiment, the nozzle is part of a fuel injection system for metering a coal-water slurry into a large, medium-speed, multi-cylinder diesel engine. In order to retard erosion of the orifice, the substrate is placed in a chemical vapor deposition (CVD) reaction chamber. A reaction gas is passed into the chamber at a gas temperature below its reaction temperature and is directed through the orifice in the substrate. The gas reaction temperature is a temperature at and above which the reaction gas deposits as a coating, and the reaction gas is of a composition whereby improved resistance to erosion by flow of the particulates in the slurry fuel is imparted by the deposited coating.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: February 21, 1995
    Assignee: General Electric Company
    Inventors: Paul L. Flynn, Anthony W. Giammarise
  • Patent number: 5387039
    Abstract: A pinion end bearing assembly for supporting and sealing about a shaft which extends through the frame of a traction motor, such as an AC traction motor. The assembly having a rearward end plate assembly attached to the frame, a housing attached to the frame, the shaft extending through the housing and a rotatable element attached to and circumscribing the shaft between the housing and shaft. The rotatable element and the housing adapted to form a series of three labyrinth seals to restrain the flow of air from within the motor to a bearing chamber with the seals being separated by venting chambers to vent to a low pressure reservoir any air which may flow through the labyrinth seals.
    Type: Grant
    Filed: December 1, 1993
    Date of Patent: February 7, 1995
    Assignee: General Electric Company
    Inventor: Paul R. Bien
  • Patent number: 5385855
    Abstract: A depletion mode MOSFET and resistor are fabricated as a silicon carbide (SiC) integrated circuit (IC). The SiC IC includes a first SiC layer doped to a first conductivity type and a second SiC layer overlaid on the first SiC layer and doped to a second conductivity type. The second SiC layer includes at least four more heavily doped regions of the second conductivity type, with two of such regions comprising MOSFET source and drain electrodes and two other of such regions comprising resistor electrodes. The second SiC layer includes an isolation trench between the MOSFET electrodes and the resistor electrodes. At least two electrically conductive contacts are provided as MOSFET electrode contacts, each being positioned over at least a portion of a respective MOSFET electrode and two other electrically conductive contacts are provided as resistor electrode contacts, each being positioned over at least a portion of a respective resistor electrode.
    Type: Grant
    Filed: February 24, 1994
    Date of Patent: January 31, 1995
    Assignee: General Electric Company
    Inventors: Dale M. Brown, Gerald J. Michon, Vikram B. Krishnamurthy, James W. Kretchmer
  • Patent number: 5378642
    Abstract: A silicon carbide (SiC) junction field effect transistor (JFET) device is fabricated upon a substrate layer, such as a p type conductivity SiC substrate, using ion implantation for the source and drain areas. A SiC p type conductivity layer is epitaxially grown on the substrate. A SiC n type conductivity layer is formed by ion implantation or epitaxial deposition upon the p type layer. The contacting surfaces of the p and n type layers form a junction. A p+ type gate area supported by the n type layer is formed either by the process of ion implantation or the process of depositing and patterning a second p type layer. The source and drain areas are heavily doped to n+ type conductivity by implanting donor ions in the n type layer.
    Type: Grant
    Filed: April 19, 1993
    Date of Patent: January 3, 1995
    Assignee: General Electric Company
    Inventors: Dale M. Brown, Mario Ghezzo
  • Patent number: 5373993
    Abstract: The present invention is directed to a process for coating the interior surfaces of an orifice in a substrate that forms a slurry fuel injection nozzle. In a specific embodiment, the nozzle is part of a fuel injection system for metering a coal-water slurry into a large, medium-speed, multi-cylinder diesel engine. In order to retard erosion of the orifice, the substrate is placed in a chemical vapor deposition (CVD) reaction chamber. A reaction gas is passed into the chamber at a gas temperature below its reaction temperature and is directed through the orifice in the substrate. The gas reaction temperature is a temperature at and above which the reaction gas deposits as a coating, and the reaction gas is of a composition whereby improved resistance to erosion by flow of the particulates in the slurry fuel is imparted by the deposited coating.
    Type: Grant
    Filed: August 6, 1992
    Date of Patent: December 20, 1994
    Assignee: General Electric Company
    Inventors: Paul L. Flynn, Anthony W. Giammarise
  • Patent number: 5373219
    Abstract: A control system for an electrical propulsion system for a large wheeled vehicle adapted to haul a payload, the vehicle having an internal combustion engine and an electric generating means driven by the engine. The control system measures selected parameters and controls the engine and generating means to maximize output, and records historical operating data relating to the vehicle and its systems, and has a 2 digit display that provides information useful in troubleshooting problems.
    Type: Grant
    Filed: March 11, 1993
    Date of Patent: December 13, 1994
    Assignee: General Electric Company
    Inventors: Francis M. Grabowski, Amy D. Duke, Frederick G. Beach, James W. Nash, Paul H. Curtis
  • Patent number: 5371501
    Abstract: An output circuit for use with an array of analog energy detectors includes a system for digital companding which is capable of providing output signals with an enhanced dynamic range. A digital compressor is provided for converting the output signals of the analog detectors into compressed digital values. Accumulators are provided for holding the output signals of the digital compressor. An expander is provided to expand the digital output signals held in the accumulators to determine the energy patterns impinging on the array of analog detectors.
    Type: Grant
    Filed: December 16, 1992
    Date of Patent: December 6, 1994
    Assignee: General Electric Company
    Inventors: Steven L. Garverick, Gerald J. Michon
  • Patent number: 5367584
    Abstract: A microelectromechanical photonic switching array comprises a plurality of first waveguides and a plurality of second waveguides. Insulative cladding is situated between the first and second waveguides. Each of the first waveguides is positioned with predetermined first waveguide portions on one side of at least one opening, and each of the second waveguides is positioned with predetermined second waveguide portions substantially parallel to respective ones of the predetermined first waveguide portions on an opposing side of said opening. A selected one of the predetermined second waveguide portions is capable of being moved closer and coupling light to a respective one of the predetermined first waveguide portions in response to either an electrostatic or piezoelectric signal. Alternatively, the first and second waveguides are co-planar and light is coupled from a predetermined first waveguide to a predetermined second waveguide by using a movable waveguide coupler.
    Type: Grant
    Filed: October 27, 1993
    Date of Patent: November 22, 1994
    Assignee: General Electric Company
    Inventors: Mario Ghezzo, Christopher P. Yakymyshyn, Anil R. Duggal