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Title: Monitoring method and apparatus using high-frequency carrier

A method and apparatus for monitoring an electrical-motor-driven device by injecting a high frequency carrier signal onto the power line current. The method is accomplished by injecting a high frequency carrier signal onto an AC power line current. The AC power line current supplies the electrical-motor-driven device with electrical energy. As a result, electrical and mechanical characteristics of the electrical-motor-driven device modulate the high frequency carrier signal and the AC power line current. The high frequency carrier signal is then monitored, conditioned and demodulated. Finally, the modulated high frequency carrier signal is analyzed to ascertain the operating condition of the electrical-motor-driven device. 6 figs.
Inventors:
Issue Date:
OSTI Identifier:
224982
Assignee:
Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States) PTO; SCA: 440800; PA: EDB-96:081446; SN: 96001577506
Patent Number(s):
US 5,512,843/A/
Application Number:
PAN: 8-151,682
Contract Number:
AC05-84OR21400
Resource Relation:
Other Information: PBD: 30 Apr 1996
Research Org:
Lockheed Martin Energy Syst Inc
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; EQUIPMENT; MONITORING; MEASURING INSTRUMENTS; DESIGN; MEASURING METHODS; ELECTRIC MOTORS; MODULATION; ELECTRIC CURRENTS; POWER SUPPLIES

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