Monitoring method and apparatus using high-frequency carrier

Patent · Mon Jan 01 00:00:00 EST 1996

OSTI ID:870400

Haynes, Howard D ^[1]

---

1. Knoxville, TN

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: AC05-84OR21400
• Assignee: Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
• Patent Number(s): US 5512843
• OSTI ID: 870400
• Country of Publication: United States
• Language: English

Related Subjects

monitoring
method
apparatus
high-frequency
carrier
electrical-motor-driven
device
injecting
frequency
signal
power
line
current
accomplished
supplies
electrical
energy
result
mechanical
characteristics
modulate
monitored
conditioned
demodulated
finally
modulated
analyzed
ascertain
operating
condition
mechanical characteristics
monitoring method
frequency carrier
carrier signal
power line
electrical energy
operating condition
electrical-motor-driven device
line current
driven device
/324/322/