1
Floyd H Wright: Method and apparatus for electronically commutating a direct current motor without position sensors. General Electric Company, Ralph E Krisher Jr, A Burgess Lowe, July 24, 1979: US04162435 (73 worldwide citation)

Method and apparatus for electronically commutating a direct current motor is disclosed not requiring position sensors but rather sampling induced voltage across an unenergized motor winding to derive control signals therefrom. One motor winding is energized while the voltage across another winding ...


2
Phillip R Herrick, Daniel C Ewing, Floyd H Wright, Kevin M Truelove: Method and apparatus for testing dynamoelectric machine rotors. General Electric Company, Ralph E Krisher Jr, September 3, 1991: US05045779 (5 worldwide citation)

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 ...


3
Phillip R Herrick, Daniel C Ewing, Floyd H Wright, Kevin M Truelove: Method and apparatus for testing dynamoelectric machine rotors. General Electric Company, Ralph E Krisher Jr, July 10, 1990: US04940932 (3 worldwide citation)

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 ...


4
Phillip R Herrick, Daniel C Ewing, Floyd H Wright, Kevin M Truelove: Method and apparatus for testing dynamoelectric machine rotors. General Electric Company, Ralph E Krisher Jr, January 31, 1989: US04801877 (3 worldwide citation)

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 ...


5
Phillip R Herrick, Daniel C Ewing, Floyd H Wright, Kevin M Truelove: Method and apparatus for testing dynamoelectric machine rotors. General Electric Company, Ralph E Krisher Jr, July 27, 1993: US05231348 (1 worldwide citation)

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 ...