Gerald K Flakas

46976612, Oct 6, 1987

Jul 14, 1986

6/885484

Michael J. Pajerski - Waukesha WI
Steven J. Gray - Mukwonago WI
Gerald K. Flakas - Oconomowoc WI
Dennis J. Cotic - Waukesha WI

General Electric Company - Milwaukee WI

B62D 1104

180 65

A control system for providing power to independently driven wheels of a power driven cart for transporting medical diagnostic equipment. A manually engageable handle is mounted to the cart in a position allowing a person to exert a manual force on the handle in a direction in which it is desired for the cart to move. Force sensors are coupled to the handle to sense the manual force applied to it in a plane parallel to the plane on which the cart is to be moved. The force sensors provide signals representative of the magnitude and direction of the manual force applied to the handle in forward, reverse and turning directions. Electronic circuits are coupled to the force sensors for providing control signals to motors driving the wheels of the cart for independently controlling direction and velocity of movement of the cart.

49301462, May 29, 1990

Jul 10, 1989

7/377353

Gerald K. Flakas - Oconomowoc WI
Harold J. Dalman - Brookfield WI

General Electric Company - Milwaukee WI

H05G 134

378110

The tube current in an X-ray tube is controlled by a closed loop control circuit in which a tube current feedback signal is used to control X-ray tube filament current. The gain of the feedback loop is maintained substantially constant over a wide range of tube currents by inserting a signal proportional to the reciprocal of the tube current command.

52651460, Nov 23, 1993

Nov 16, 1992

7/976765

William F. Wirth - Sullivan WI
Gerald K. Flakas - Westminster CO

General Electric Company - Milwaukee WI

H05G 166

378 93

An x-ray tube rotor controller uses the main high voltage inverters for acceleration and speed maintenance. The rotor controller includes a DC voltage source, and a rotary anode drive circuit including a rotary anode motor designed as a two-winding induction motor. The rotor controller comprises first and second inverter circuits which may be either half bridge or full bridge arrangements, the first and second inverter circuits for accelerating the anode, and further for generating high voltage for the x-ray tube. Electronic switching means allow for instantaneous electronic switching of the output of the first and second inverter circuits between the high voltage power supply and the anode motor. A phase switching capacitor may be used to provide the other phase of the motor.