Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1991-06-19
1993-07-27
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324545, G01R 3106, G01R 3134
Patent
active
052313484
ABSTRACT:
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.
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Ewing Daniel C.
Herrick Phillip R.
Truelove Kevin M.
Wright Floyd H.
General Electric Company
Karlsen Ernest F.
Krisher, Jr. Ralph E.
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