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.
- Research Organization:
- Lockheed Martin Energy Syst Inc
- DOE Contract Number:
- AC05-84OR21400
- Assignee:
- Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States)
- Patent Number(s):
- US 5,512,843/A/
- Application Number:
- PAN: 8-151,682
- OSTI ID:
- 224982
- Country of Publication:
- United States
- Language:
- English
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Motor monitoring method and apparatus using high frequency current components
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