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Title: Motor-operated valve (MOV) actuator motor and gearbox testing

Motor-operated valve (MOV) actuator motor and gearbox testing Researchers at the Idaho National Engineering and Environmental Laboratory tested the performance of electric motors and actuator gearboxes typical of the equipment installed on motor-operated valves used in nuclear power plants. Using a test stand that simulates valve closure loads against flow and pressure, the authors tested five electric motors (four ac and one dc) and three gearboxes at conditions a motor might experience in a power plant, including such off-normal conditions as operation at high temperature and reduced voltage. They also monitored the efficiency of the actuator gearbox. All five motors operated at or above their rated starting torque during tests at normal voltages and temperatures. For all five motors, actual torque losses due to voltage degradation were greater than the losses calculated by methods typically used for predicting motor torque at degraded voltage conditions. For the dc motor the actual torque losses due to elevated operating temperatures were greater than the losses calculated by the typical predictive method. The actual efficiencies of the actuator gearboxes were generally lower than the running efficiencies published by the manufacturer and were generally nearer the published pull-out efficiencies. Operation of the gearbox at elevated temperature did not affect the operating efficiency.
Authors: ; ;
Publication Date:
OSTI Identifier:OSTI ID: 515583
Report Number(s):NUREG/CR--6478; INEL--96/0219
ON: TI97008289; TRN: 97:014861
DOE Contract Number:AC07-94ID13223
Resource Type:Technical Report
Resource Relation:Other Information: PBD: Jul 1997
Research Org:Nuclear Regulatory Commission, Washington, DC (United States). Div. of Engineering Technology; Lockheed Idaho Technologies Co., Idaho Falls, ID (United States)
Sponsoring Org:Nuclear Regulatory Commission, Washington, DC (United States)
Country of Publication:United States
Language:English
Subject: 22 NUCLEAR REACTOR TECHNOLOGY; NUCLEAR POWER PLANTS; VALVES; ACTUATORS; ENGINEERED SAFETY SYSTEMS; ELECTRIC MOTORS; PERFORMANCE TESTING; EXPERIMENTAL DATA; GEARS; TEMPERATURE DEPENDENCE; DESIGN BASIS ACCIDENTS