Motor current signal processor using analog substraction of an e

Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction

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327299, 327551, 318629, H03D 324

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active

055508804

ABSTRACT:
A signal processing system includes a phase locked loop for locking a largest sine wave phase and frequency element of an incoming analog signal; an amplitude estimator for estimating a maximum amplitude of the incoming signal; a multiplier for multiplying the estimated largest sine wave phase and frequency element by the estimated maximum amplitude to provide an estimated largest sine wave component; and a subtractor for subtracting the estimated largest sine wave component from the incoming signal to provide a diagnostic signal.

REFERENCES:
patent: 4569072 (1986-02-01), Van Roermund
patent: 5124657 (1992-06-01), Waller, Jr.
patent: 5448598 (1995-09-01), Yousefi et al.
"Methods of Motor Current Signature Analysis" By GB Kliman, et al, Electric Machines & Power Systems, 20:463-474, 1992.

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