Phillip L Herrick

52313484, Jul 27, 1993

Jun 19, 1991

7/717682

Phillip R. Herrick - Fort Wayne IN
Daniel C. Ewing - Fort Wayne IN
Floyd H. Wright - Fort Wayne IN
Kevin M. Truelove - Fort Wayne IN

General Electric Company - Fort Wayne IN

G01R 3106
G01R 3134

324158MG

A method and apparatus for testing dynamoelectric machine rotors, particularly squirrel cage rotors for induction motors, to obtain resistance, reactance, and effective skew values to permit identification of rotor defects. The rotor is rotated in an alternating magnetic field and pick-up coils are used to sense the voltage generated in the rotor by sensing the magnetic flux generated by magnetization of the rotor during rotation. Current sensing is used to determine the current used in magnetizing the rotor and a separate skew pick-up coil is utilized to detect effective electrical skew. These signals are processed to determine whether the rotor meets predetermined pass/fail criteria, to provide detailed statistical data and to generate a failure indication responsive to one of the values falling outside respective predetermined limits.

48018775, Jan 31, 1989

May 6, 1986

6/860240

Phillip R. Herrick - Fort Wayne IN
Daniel C. Ewing - Fort Wayne IN
Floyd H. Wright - Fort Wayne IN
Kevin M. Truelove - Fort Wayne IN

General Electric Company - Fort Wayne IN

G01R 3106

324158MG

A method and apparatus for testing dynamoelectric machine rotors, particularly squirrel cage rotors for induction motors, to obtain resistance, reactance, and effective skew values to permit identification of rotor defects. The rotor is rotated in an alternating magnetic field and pick-up coils are used to sense the voltage generated in the rotor by sensing the magnetic flux generated by magnetization of the rotor during rotation. Current sensing is used to determine the current used in magnetizing the rotor and a separate skew pick-up coil is utilized to detect effective electrical skew. These signals are processed to determine whether the rotor meets predetermined pass/fail criteria, to provide detailed statistical data and to generate a failure indication responsive to one of the values falling outside respective predetermined limits.

50457799, Sep 3, 1991

Apr 9, 1990

7/506661

Phillip R. Herrick - Fort Wayne IN
Daniel C. Ewing - Fort Wayne IN
Floyd H. Wright - Fort Wayne IN
Kevin M. Truelove - Fort Wayne IN

General Electric Company - Fort Wayne IN

G01R 3106

324158MG

A method and apparatus for testing dynamoelectric machine rotors, particularly squirrel cage rotors for induction motors, to obtain resistance, reactance, and effective skew values to permit identification of rotor defects. The rotor is rotated in an alternating magnetic field and pick-up coils are used to sense the voltage generated in the rotor by sensing the magnetic flux generated by magnetization of the rotor during rotation. Current sensing is used to determine the current used in magnetizing the rotor and a separate skew pick-up coil is utilized to detect effective electrical skew. These signals are processed to determine whether the rotor meets predetermined pass/fail criteria, to provide detailed statistical data and to generate a failure indication responsive to one of the values falling outside respective predetermined limits.

49409328, Jul 10, 1990

Nov 10, 1988

7/269500

Phillip R. Herrick - Fort Wayne IN
Daniel C. Ewing - Fort Wayne IN
Floyd H. Wright - Fort Wayne IN
Kevin M. Truelove - Fort Wayne IN

General Electric Company - Fort Wayne IN

G01R 3106

324158MG

A method and apparatus for testing dynamoelectric machine rotors, particularly squirrel cage rotors for induction motors, to obtain resistance, reactance, and effective skew values to permit identification of rotor defects. The rotor is rotated in an alternating magnetic field and pick-up coils are used to sense the voltage generated in the rotor by sensing the magnetic flux generated by magnetization of the rotor during rotation. Current sensing is used to determine the current used in magnetizing the rotor and a separate skew pick-up coil is utilized to detect effective electrical skew. These signals are processed to determine whether the rotor meets predetermined pass/fail criteria, to provide detailed statistical data and to generate a failure indication responsive to one of the values falling outside respective predetermined limits.

39537633, Apr 27, 1976

Apr 23, 1975

5/570689

Phillip R. Herrick - Fort Wayne IN

General Electric Company - Indianapolis IN

H05B 4134
H05B 4129

315262

A circuit for the repetitively pulsed operation of a xenon arc discharge lamp. A first SCR is responsive to a first control circuit when fired to allow the charging of a capacitor through a first inductor from a DC energy source. A second SCR is responsive to a second control circuit, and when fired connects the capacitor through a second inductor to a lamp to provide an operating current pulse for the lamp. Also, upon firing of the second SCR, the capacitor supplies a voltage pulse to a pulse transformer which in turn generates a high voltage pulse for ionizing the lamp. The first SCR is responsive to its control circuit to be conductive only when the capacitor is discharged and the second SCR is responsive to its respective control circuit to be conductive only when the capacitor is fully charged. In actual operation, one SCR must have been non-conducting for a predetermined time before the other SCR is allowed to become conductive thereby to prevent shoot-through.