Motor monitor signal analysis system

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor

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324 77B, 364485, G01R 3112, G01R 2316, G01R 2300

Patent

active

046789901

ABSTRACT:
A signal analysis system for a magnetic field motor monitor utilizes an analog-to-digital converter for sampling the motor magnetic field at accurately determined and equally spaced times synchronized with the line frequency driving the motor. A plurality of separate memories are provided to accumulate the respective samples which are added to or subtracted from the contents of respective memories, depending on which of the samples is being processed as indicated by control bits in a status register. Signals indicative of the amplitudes of respective harmonically related frequency components of the motor magnetic field are provided from the contents of the memories by combining the respective in phase and quadrature values. A monitor provides an indication of when there has been a change in these combined signals.

REFERENCES:
patent: 4156846 (1979-05-01), Harrold et al.
Muniappan et al; "Microprocessor-Based Walsh-Fourier Spectral Analyzer"; IEEE Transactions on Instrumentaton and Measurement; vol. IM-28, No. 4; Dec. 1979; pp. 295-297.

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