The use of the motor as a transducer to monitor pump conditions

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Motor current and power analysis methods have been developed to assist in the condition monitoring of a variety of motor-driven devices. The successful implementation of motor current signature analysis (MCSA) as a diagnostic for valves led to its application to other devices and to refinements in the methodologies used. A variety of pump applications, ranging from 5 to over 1200 horsepower have been analyzed, including low and high specific speed and suction specific speed pumps. For some of the pumps, the full range of flow conditions from shutoff to runout has been studied. Motor current and power analysis have been ... continued below

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16 p.

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Casada, D.A. & Bunch, S.L. December 31, 1995.

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Description

Motor current and power analysis methods have been developed to assist in the condition monitoring of a variety of motor-driven devices. The successful implementation of motor current signature analysis (MCSA) as a diagnostic for valves led to its application to other devices and to refinements in the methodologies used. A variety of pump applications, ranging from 5 to over 1200 horsepower have been analyzed, including low and high specific speed and suction specific speed pumps. For some of the pumps, the full range of flow conditions from shutoff to runout has been studied. Motor current and power analysis have been found to provide information that is complementary to that available from conventional diagnostics, such as vibration and pressure pulsation analysis. Inherent signal filtering associated with rotor to stator magnetic field coupling does limit the high frequency response capability of the motor as a transducer; as a result certain phenomena, such as vane pass energy, is not readily apparent in the motor electrical signals. On the other hand, the motor-monitored parameters have often been found to be much more sensitive than vibration transducers in detecting the effects of unsteady flow conditions resulting from both system and pump specific sources such as suction cavitation. By combining motor equivalent circuit models with pump performance characteristics, shaft power and torque fluctuation estimates have been assessed. The usefulness of motor data in assessing some common sources of pump problems, such as mechanical and hydraulic imbalance, misalignment, and unstable flow conditions is shown. The results of testing several motor-driven pumps, including comparisons with vibration and pressure pulsation analysis are discussed. The development of a single figure of merit for pump load stability (as a function of pump flow rate and type) is presented.

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16 p.

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OSTI as DE96010594

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  • P/PM technology conference, Indianapolis, IN (United States), 6 Dec 1995

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  • Other: DE96010594
  • Report No.: CONF-951282--1
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 236262
  • Archival Resource Key: ark:/67531/metadc672401

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 31, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Jan. 29, 2016, 1:46 p.m.

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Casada, D.A. & Bunch, S.L. The use of the motor as a transducer to monitor pump conditions, article, December 31, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc672401/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.