Patents Represented by Attorney C. M. Lorin

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  • Continuous metal casting apparatus
    Patent number: 4693299
    Abstract: In a continuous casting vessel, the gap between the feed column of molten metal and the mold inlet port is electromagnetically sealed by applying polyphase current on the edge of the inlet port to form therewith an intergral inductor effective to contain the metal in the pool about the meniscus at the base of the feed column in the sunk nozzle.
    Type: Grant
    Filed: June 5, 1986
    Date of Patent: September 15, 1987
    Assignee: Westinghouse Electric Corp.
    Inventors: Stephen B. Kuznetsov, Richard D. Nathenson
  • Low dissipation capacitor voltage sharing circuit for a static AC/DC converter
    Patent number: 4686619
    Abstract: In an AC/DC converter, the dissipation voltage sharing resistors commonly placed in parallel with the series capacitors are replaced by a resistor balancing path derived from the capacitor junction point to a symmetrically disposed voltage reference point belonging to the AC input vectorial system.
    Type: Grant
    Filed: September 17, 1986
    Date of Patent: August 11, 1987
    Assignee: Westinghouse Electric Corp.
    Inventor: Charles W. Edwards
  • Unrestricted frequency changer switch topology
    Patent number: 4685049
    Abstract: The N converters of a UFC bridge system interconnecting an N-phase voltage source to N output loads, comprise each N bilateral switches connected to one end of the associated output load and (N-1) bilateral switches connected to the other end thereof. The (N-1) bilateral switches of the respective converters build up a polygonal assembly between the output loads which is selectively connected to the respective phases of the voltage source by selective control of the N groups of N switches and of the (N-1) groups of switches.
    Type: Grant
    Filed: July 22, 1986
    Date of Patent: August 4, 1987
    Assignee: Westinghouse Electric Corp.
    Inventor: Charles L. Neft
  • AC/DC or DC/AC converter system with outboard commutation inductors
    Patent number: 4683527
    Abstract: In a 12-pulse AC/DC converter of the hexagon type the rectifier switches are distributed in three groups for each polarity and for each polarity three coils are joined to the common pole and connected separately to the pairs of rectifier switches of a corresponding group. As a result, the capability of the hexagon is extended to commutation of diodes, instead of controlled rectifier switches, by the effect of such interposed commutation inductance.
    Type: Grant
    Filed: August 13, 1986
    Date of Patent: July 28, 1987
    Assignee: Westinghouse Electric Corp.
    Inventor: John Rosa
  • Current source inverter motor drive adapted for full current regenerative mode operation
    Patent number: 4683412
    Abstract: A current source inverter operates in a full current regenerative mode without the use of a tachometer, rather a constant volts-per-hertz loop is used in a motor feedback loop to generate a torque signal determining the current reference in a DC link current control loop, and the DC link voltage is sensed to derive a signal in magnitude and sign to allow maximizing current control under torque limits established on the basis of such sensed DC link voltage.
    Type: Grant
    Filed: November 21, 1985
    Date of Patent: July 28, 1987
    Assignee: Westinghouse Electric Corp.
    Inventors: Edward J. Bialek, Leslie B. Anticich
  • Multi-inverter control apparatus
    Patent number: 4674025
    Abstract: In a multi-inverter system, inverters in series are swapped around in order to eliminate regenerative power due to phase difference between consecutive inverters in series.
    Type: Grant
    Filed: June 5, 1986
    Date of Patent: June 16, 1987
    Assignee: Westinghouse Electric Corp.
    Inventor: Charles W. Edwards
  • Torque controller for an AC motor drive and AC motor drive embodying the same
    Patent number: 4672288
    Abstract: In an induction motor drive a signal representative of the torque T as derived by sensing only the stator armature current I, and the slip frequency f.sub.2 and by calculating instantaneously T=I.sub.1.sup.2 F, where F is a function of f.sub.2 /R.sub.2, where R.sub.2 is the rotor resistance of the motor. The value of R.sub.2 is adjusted to match temperature by generally two alternative methods: (1) measuring the stator temperature, relying on the change of resistance R.sub.1, known experimentally, and applying an equivalent change for the rotor resistance R.sub.2 ; (2) by running the motor at rated speed and determining experimentally R.sub.2 /f.sub.2 as a function of F.
    Type: Grant
    Filed: June 18, 1985
    Date of Patent: June 9, 1987
    Assignee: Westinghouse Electric Corp.
    Inventor: Alberto Abbondanti
  • Active power conditioner system
    Patent number: 4651265
    Abstract: At least two active conditioners are connected in series with a common DC source, and are mounted as a unit between two pairs of AC terminals to act either as a tie-in link between two AC power sources, as a buck/boost regulator between one AC power source and its load, or as VAR compensator as well as active power conditioner between phases of a multiphase AC option.
    Type: Grant
    Filed: July 29, 1985
    Date of Patent: March 17, 1987
    Assignee: Westinghouse Electric Corp.
    Inventors: Eric J. Stacey, Michael B. Brennen
  • Delay circuit for inverter switches
    Patent number: 4651270
    Abstract: Transistors or GTO's of an inverter are switched ON/OFF with a delay circuit which has a capacitor first charged at a forcing rate, then, held at an intermediary level, and which is first discharged at a forcing rate, then held at an intermediary level, thereby to provide underlap, minimum ON and OFF time control and noise filtering with a high precision.
    Type: Grant
    Filed: November 6, 1985
    Date of Patent: March 17, 1987
    Assignee: Westinghouse Electric Corp.
    Inventor: Charles W. Edwards
  • Static switches firing system
    Patent number: 4644243
    Abstract: In a static DC/AC converter sequentially fired in relation to the frequency of the AC power supply, gating is provided by down counters which are instantly advanced, or delayed, in accordance with a change in the reference frequency, thereby to provide instantaneous firing angle adjustment.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: February 17, 1987
    Assignee: Westinghouse Electric Corp.
    Inventor: Edward J. Bialek
  • Hidden DC-link AC/AC converter using bilateral power switches
    Patent number: 4642751
    Abstract: The invention resides in providing bilateral switches between the respective phase lines of an AC input source and a common phase line of an AC output to form a phase line group of said bilateral switches on each AC output line; in fact, controlling the bilateral switches of each group so as to generate with AC input lines a DC link voltage with respect to the associated AC output line, and secondly in controlling the bilateral switches in such group to modulate such DC link voltage in relation to a desired AC voltage for such associated AC output line, each of said groups being operated with a corresponding phase shift to provide a corresponding phase shift between the respective output phase lines.
    Type: Grant
    Filed: February 14, 1986
    Date of Patent: February 10, 1987
    Assignee: Westinghouse Electric Corp.
    Inventor: Colin D. Schauder
  • Fault-protection apparatus for static AC-to-AC converters and unrestricted frequency changer (UFC) system including such fault-protection apparatus
    Patent number: 4642747
    Abstract: Fault-protection is added to static AC-to-AC converter to protect the GTO devices bilaterally by adding at least two line bridges of diodes having an inductor thereacross. Fault-protection is extended to a UFC system by incorporating such inductor in the diode bridges of the GTO devices forming the bilateral switches of the UFC system. The dissipating energy is minimized by combining such fault-protection bridges. The inductors may be coupled controlled demagnetization of the inductors is provided.
    Type: Grant
    Filed: May 22, 1985
    Date of Patent: February 10, 1987
    Assignee: Westinghouse Electric Corp.
    Inventor: Gyu-Hyeong Cho
  • Multiplane optimization method and apparatus for cogeneration of steam and power
    Patent number: 4628462
    Abstract: In a steam and power cogeneration system optimization results for steam flow and power are calculated off-line recurrently based on actual demand and control is effected on a multiplane basis upon selection of a new plane of control defined by a new status and configuration of the system network, the optimization results for such particular plane being selected and control performed at the time of plane change. Pressure reducing valves are positioned initially at the time of plane change in accordance with the optimization results for the new plane. Pressure reducing valves are positioned for flow tuning about such initial valve positioning.
    Type: Grant
    Filed: September 11, 1984
    Date of Patent: December 9, 1986
    Assignee: Westinghouse Electric Corp.
    Inventor: Richard E. Putman
  • Steam optimization and cogeneration system and method
    Patent number: 4604714
    Abstract: In a multiturbogenerator cogeneration system mass flow balancing is used to optimize the distribution of steam between the machine while meeting the demand in steam and electrical power of the industrial plant in order to choose the less costly between cogenerated power and power purchased from the tie-line. The EVOP method of optimization is used off-line with the assist of a microcomputer to determine the optimal distribution of steam.
    Type: Grant
    Filed: November 8, 1983
    Date of Patent: August 5, 1986
    Assignee: Westinghouse Electric Corp.
    Inventors: Richard E. Putman, Katherine A. Gundersen, James C. Christenson
  • PWM motor drive with torque determination
    Patent number: 4602201
    Abstract: A pulse-width-modulated motor drive includes means for the derivation of a signal representative of the torque by sensing the DC-link current directly, or indirectly, and by dividing the sensed signal by the modulation index of the motor drive to obtain proportionality through the duty-cycle long range succession.
    Type: Grant
    Filed: October 9, 1985
    Date of Patent: July 22, 1986
    Assignee: Westinghouse Electric Corp.
    Inventor: Charles W. Edwards
  • Adaptive temperature control system for the supply of steam to a steam turbine
    Patent number: 4589255
    Abstract: The invention relates to a combined heat recovery steam generator and steam turbine. An adaptive temperature controller establishes a target temperature for controlling the boiler temperature so that the steam admitted on the boiler follows a constant enthalpy when trying to match temperature of steam and rotor temperature.
    Type: Grant
    Filed: October 25, 1984
    Date of Patent: May 20, 1986
    Assignee: Westinghouse Electric Corp.
    Inventors: Alan Martens, Gerry A. Myers
  • Control method and apparatus for a UFC for minimizing input current distortions
    Patent number: 4581696
    Abstract: In a pulse-width modulated unrestricted frequency changer (UFC) the harmonic contents of the input current are minimized by splitting the active time intervals within the fundamental time frame into at least two pulses which are located within such time frame and controlled in width as if individual PWM single-pulse UFC's were controlled having a phase shift between each other so as to eliminate or reduce undesired frequency components. Such elimination or minimization of selected frequency components is used to reduce the size of the lowpass filter at the input of the UFC, namely by allowing a higher cut-off resonance limit.
    Type: Grant
    Filed: April 3, 1984
    Date of Patent: April 8, 1986
    Assignee: Westinghouse Electric Corp.
    Inventors: Laszlo Gyugyi, Theodore M. Heinrich, Gyu-Hyeong Cho
  • Heat recovery steam generator outlet temperature control system for a combined cycle power plant
    Patent number: 4578944
    Abstract: In a combined cycle plant boiler an inlet temperature is adjusted or controlled while concurrently modulating the IGV's and the load of the gas turbine and the attemperator of the boiler, and concurrent modulation of the IGV's, the gas turbine load, the attemperator is effected as upon three independent control variables to adjust and/or maintain the boiler outlet temperature independently of steam turbine operation and to maximize gas turbine load control range. Control of the output temperature of one boiler is also managed in relation with the mixed temperature of steam from other boilers fluidly connected to the steam turbines.
    Type: Grant
    Filed: October 25, 1984
    Date of Patent: April 1, 1986
    Assignee: Westinghouse Electric Corp.
    Inventors: Alan Martens, Gerald A. Myers, William L. McCarty, Kermit R. Wescott
  • Interlaced pulse-width modulated unrestricted frequency changer system
    Patent number: 4578746
    Abstract: In a static frequency changer controlled by adjusting the time of conduction of the bilateral switching units forming static converters, the time of conduction is split into n time intervals of respective subdurations adding up to be equivalent to the effective time of conduction of the controlled switching unit, and such subdurations are spread and distributed throughout the time period of control of the switching unit both within the original switching pattern of each converter and between the effective times of conduction of the respective converters, thereby to minimize harmonic distortion of the input supply current of the frequency changer.
    Type: Grant
    Filed: April 3, 1984
    Date of Patent: March 25, 1986
    Assignee: Westinghouse Electric Corp.
    Inventors: Laszlo Gyugyi, Theodore M. Heinrich, Gyu-Hyeong Cho
  • Apparatus and method for fluidly connecting a boiler into pressurized steam feed line and combined-cycle steam generator power plant embodying the same
    Patent number: 4576124
    Abstract: A coupling controller opens a dump valve at the outlet of a heat recovery steam generator when such generator is to be coupled to another generator being in operation with a steam turbine on a common header. The controller gradually permits pressure build-up until the pressure at the outlet of the new generator matches the pressure behind the header. The controller also responds to critical conditions in the superheater as well as in the high pressure drum of the generator in the operation.
    Type: Grant
    Filed: October 25, 1984
    Date of Patent: March 18, 1986
    Assignee: Westinghouse Electric Corp.
    Inventors: Alan Martens, Kermit R. Wescott, Bennie E. Snow