Monitoring method and apparatus using high-frequency carrier

Details Monitoring method and apparatus using high-frequency carrier Monitoring method and apparatus using high-frequency carrier

1993-11-15

1996-04-30

Karlsen, Ernest F.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

322 99, G01R 3134

Patent

active

055128432

ABSTRACT:
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.

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Vincent Del Toro: Electromechanical Devices for Energy Conversion and Control Systems Published by Prentice-Hall, Inc., Chapter 4, pp. 174-178.
Application Data-AC, MG1-1987, Part 14 pp. 6-7.

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