Emil Jacob Rosenzweig

US Patent:

58834877, Mar 16, 1999

Filed:

Jul 25, 1997

Appl. No.:

8/900613

Inventors:

Emil Rosenzweig - Glenview IL
Oscar Khutoryansky - Glenview IL
Thomas Simak - Warrenville IL

Assignee:

Continental X-Ray Corporation - Broadview IL

International Classification:

G01P 346
H01J 3510

US Classification:

318781

Abstract:

A speed control apparatus for determining and controlling the speed of rotation of a rotor in an AC motor. The motor includes a stator having main and auxiliary windings. Main and auxiliary winding controllers control the operational input signals supplied to the main and auxiliary windings by a signal generator. A pulse generator is connected to the main winding for providing a test pulse during a speed measurement operation. The test pulse magnetizes a portion of the rotor which induces a feedback EMF signal in the auxiliary winding. A feedback sensor circuit receives the feedback signal and forwards it to a microprocessor. The microprocessor calculates the rotational speed of the rotor based on the feedback signal.

US Patent:

59011971, May 4, 1999

Filed:

Aug 20, 1997

Appl. No.:

8/915229

Inventors:

Oscar Khutoryansky - Glenview IL
Thomas Rosevear - Forest Park IL
Cyril Tomsic - Hanover Park IL
Emil Rosenzweig - Glenview IL

Assignee:

Continental X-Ray Corporation - Broadview IL

International Classification:

H01J 3506

US Classification:

378 15

Abstract:

Methods for extending the life of an X-ray tube having at least two filaments which are individually energizable in which the filaments are successively energized either for a predetermined number of exposures or based on a predetermined passage of time, and methods for predicting imminent failure of still functioning filaments.