Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1990-04-20
1991-07-09
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324158MG, G01R 3106
Patent
active
050309170
ABSTRACT:
To detect broken bars in the rotor of induction and synchronous motors, the current drawn by the motor during the transient startup period as the motor runs up to steady state speed is analyzed to identify any dip in the starting motor current amplitude occurring when the motor reaches approximately half-speed. The magnitude of any identified current dip is tested against threshold values to determine if the dip is characteristic of a broken rotor bar condition. Reliable broken rotor bar detection is achieved regardless of whether the motor is loaded or unloaded.
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Cahill Robert A.
General Electric Company
Policinski Henry J.
Regan Maura K.
Wieder Kenneth A.
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