DAVID GEORGE HALL, MD
Marriage and Family Therapists at Harvard Sq, Pittsburgh, PA

6952086, Oct 4, 2005

Oct 10, 2003

10/683964

Mark Peter Krefta - Murrysville PA, US
David Jonathan Hall - Pittsburgh PA, US
Kenneth Martin Eichler - Murrysville PA, US
Jiing-Liang Wu - Murrysville PA, US
Robert E. Strickler - Pittsburgh PA, US
Michael Barnaby Brennen - Pittsburgh PA, US

Curtiss-Wright Electro-Mechanical Corporation - Cheswick PA

H02K041/00

318135, 310 12

A control system for a linear motor adapted to accurately supply a moving window of power to the stator coils. A plurality of individually switched stator coils run the length of a linear motor to move a rotor down the long axis of the stator. Accurate inductive-based position sensors continuously provide position data for the moving rotor. A processing unit calculates a proper time delay from a source voltage peak in order to apply power to the next stator coil in the moving direction of the rotor such that no DC offshoot/undershoot occurs. The linear motor control system optionally includes a failure prevention switching scheme in which pairs of individual stator coils on opposite sides of a double-sided stator are switched together.

8076881, Dec 13, 2011

Jun 16, 2009

12/485788

David J. Hall - Pittsburgh PA, US
Mark P. Krefta - Murrysville PA, US

Curtiss-Wright Electro-Mechanical Corp. - Chewick PA

H02P 31/00, H02P 1/46

3184002, 31840032, 31840033, 318701, 318802

A system. The system includes a first module, a second module communicably connected to the first module, a third module communicably connected to the first module, and a fourth module communicably connected to the third module. The first module is configured for determining an angle. The angle is defined by a first rotating reference frame having an axis aligned with a permanent magnet flux of a permanent magnet motor, and a vector of a motor magnetizing flux of the permanent magnet motor. The second module is configured for defining a second rotating reference frame having an axis aligned with the vector, and for transforming a two-phase set of direct currents from the first rotating reference frame to the second rotating reference frame. The first and second rotating reference frames are synchronized. The third module is configured for generating a first direct current reference signal associated with the second rotating reference frame.

5142861, Sep 1, 1992

Apr 26, 1991

7/691889

Rex L. Schlicher - Lorton VA
Steven M. Rinaldi - E-401 APO New York NY
David J. Hall - Pittsburgh PA
Peter M. Ranon - San Pedro CA
Charles E. Davis - Albuquerque NM

F02K 1100

602031

An electromagnetic propulsion system based on an extremely low frequency (elf) radiating antenna structure driven by a matched high current pulsed power supply is described. The elf antenna structure resembles a modified three dimensional multiple-turn loop antenna whose geometry is optimized for the production of reaction thrust rather than the radiation of electromagnetic energy into space. The antenna structure is current driven rather than voltage drive. Rigid three dimensional geometric asymmetry, made up of flat electrical conductors that form a partially closed volume in the loop antenna structure, trap magnetic flux thereby causing a magnetic field density gradient along a single axis. This magnetic field density gradient then causes an imbalance in the magneto- mechanical forces that normally result from the interactions of the loop antenna's internal magnetic field with the current in the conductors of the loop antenna structure, as described by the Lorentz Force Law. The pulsed power supply is designed to provide the proper waveform to the antenna structure at an impedance matching the load impedance of the antenna.