High sensitivity brush arcing monitor for a dynamoelectric machi

Details High sensitivity brush arcing monitor for a dynamoelectric machi High sensitivity brush arcing monitor for a dynamoelectric machi

1982-03-01

1984-05-29

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

340635, 340648, 361 21, G01R 3102, G08B 2100

Patent

active

044517866

ABSTRACT:
High noise immunity instrumentation for monitoring brush arcing in a dynamoelectric machine is disclosed. In a preferred form the instrumentation includes a stabilized variable threshold discriminator operative in conjunction with a feedback network and a non-linear high frequency amplifier to provide a discriminator threshold which increases with increasing levels of background noise so that only the arc indicative portions of the signal are passed. A substantial increase in the signal to noise ratio is obtained. The feedback network includes a relatively long time constant integrator and buffer amplifier. Further, to provide an alarm upon the occurrence of brush arcing, an alarm network is provided which includes a comparator for continuously comparing the arc indicative signal with a reference signal which is automatically adjusted to compensate for changes in the average level of the signal from the non-linear high frequency amplifier. This compensation provides for automatically resetting the alarm comparator. This is achieved by providing a second integrator having a time constant somewhat longer than the first integrator. By appropriately selecting the relative time constants of the first and second integrators, resolution of the alarm network is narrowed to a unit time basis, thus quantifying the measurement to provide an indication of the condition of the brushes.

REFERENCES:
patent: 4058804 (1977-11-01), Sawada et al.
patent: 4163227 (1979-07-01), Sawada et al.
patent: 4187461 (1980-02-01), Cox
patent: 4204156 (1980-05-01), Sawada et al.
patent: 4342960 (1982-08-01), Sawada

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