Patent ID: 6300701
Filing Date: 2001-10-09
Classification: F16C,H02K

Abstract:
A method of monitoring the performance of a lubrication system of a dynamoelectric induction machine (DEM) comprising;providing a DEM having a housing containing stator, and a rotor mounted on a shaft within said stator,providing a pair of bearing members in said housing for receiving said rotor shaft therein,providing lubrication means to said bearings to provide lubrication for said bearings and said shaft,providing at least one Rogowski coil on or near said rotor shaft at a location inboard of and adjacent to one of said bearings for monitoring the current induced in said shaft and for producing an output signal in accordance with the current flowing in said shaft when said DEM is energized,receiving a signal generated in said Rogowski coil in suitable monitoring equipment to provide an indication of the shaft current as sensed by said Rogowski coil,calibrating said Rogowski coil output for the determination of the current flowing in said shaft,producing a characteristic chart of shaft current vs. oil film present in the bearings of the DEM,determining the lubrication performance of said lubrication means from said chart.