Electricity: motive power systems – Constant motor current – load and/or torque control
Reexamination Certificate
2005-08-23
2005-08-23
Martin, David (Department: 2837)
Electricity: motive power systems
Constant motor current, load and/or torque control
C318S445000, C318S438000, C318S490000, C702S076000, C417S045000, C417S044100, C324S076190, C324S076220
Reexamination Certificate
active
06933693
ABSTRACT:
The present invention is directed to a centrifugal pump wherein voltage and current data are detected from voltage and current sensors in the motor controller of a pump motor. A power signal is then generated from the voltage and current data and spectrally analyzed to determine the presence of unwanted harmonics which are indicative of mechanical disturbances in the pump. As such, anomalies resulting from mechanical interference may be detected and a warning flag provided without additional transducers and other instruments on the motor or pump.
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Eaton Corporation
Martin David
Miller Patrick
Ziolkowski Patent Solutions Group, SC
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