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Title: Apparatus and method for non-invasive diagnosis and control of motor operated valve condition

An apparatus compares the torque from an MOV motor with the valve displacement, and from the comparison assesses MOV operating condition. A transducer measures the vibration of the housing of an MOV. The vibrations are due to the motions of the rotating elements within the housing, which motions are directly related to the motion of the valve relative to its seat. Signal processing apparatus analyzes the vibrations to recover the rotations of the rotating elements and thus the motion of the valve plug. Lost motion can also be determined (if a lost motion connection exists) by demodulating the vibration signal and thus taking into account also the lost motion. Simultaneously, the forces applied to the valve are estimated by estimating the torque between the stator and the rotor of the motor. Such torque can be estimated from measuring the input current and voltage alone, using a forgetting factor and a correction for the forgetting factor. A signature derived from relating the torque to the valve position can be used to assess the condition of the MOV, by comparing the signature to signatures for MOVs of known conditions. The vibration analysis components generate signals that relate to the position of elementsmore » in the operator. Similarly, the torque estimator estimates the torque output by any type of electric motor, whether or not part of an MOV analysis unit. 28 figs.« less
Inventors:
; ; ; ; ;
Issue Date:
OSTI Identifier:
426628
Assignee:
Massachusetts Inst. of Tech., Cambridge, MA (United States) PTO; SCA: 420200; PA: EDB-97:028002; SN: 97001724496
Patent Number(s):
US 5,594,175/A/
Application Number:
PAN: 8-239,073
Contract Number:
W-7405-ENG-36
Resource Relation:
Other Information: PBD: 14 Jan 1997
Research Org:
University of California
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; ACTUATORS; DIAGNOSTIC TECHNIQUES; ELECTRIC CONTROLLERS; TORQUE; MECHANICAL VIBRATIONS; ELECTRIC MOTORS; VALVES; MONITORING