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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.
Authors:
 [1]
  1. (Knoxville, TN)
Publication Date:
OSTI Identifier:
870400
Report Number(s):
US 5512843
DOE Contract Number:
AC05-84OR21400
Resource Type:
Patent
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
monitoring; method; apparatus; high-frequency; carrier; method; apparatus; monitoring; electrical-motor-driven; device; injecting; frequency; carrier; signal; power; line; current; method; accomplished; injecting; frequency; carrier; signal; power; line; current; power; line; current; supplies; electrical-motor-driven; device; electrical; energy; result; electrical; mechanical; characteristics; electrical-motor-driven; device; modulate; frequency; carrier; signal; power; line; current; frequency; carrier; signal; monitored; conditioned; demodulated; finally; modulated; frequency; carrier; signal; analyzed; ascertain; operating; condition; electrical-motor-driven; device; mechanical characteristics; monitoring method; frequency carrier; frequency carrier; frequency carrier; frequency carrier; frequency carrier; frequency carrier; carrier signal; carrier signal; carrier signal; carrier signal; carrier signal; power line; power line; power line; power line; electrical energy; operating condition; electrical-motor-driven device; electrical-motor-driven device; electrical-motor-driven device; electrical-motor-driven device; line current; line current; line current; line current; driven device; driven device; driven device; driven device /324/322/