发明名称 |
HIGH SENSITIVITY BRUSH ARCING MONITOR FOR A DYNAMOELECTRIC MACHINE |
摘要 |
<p>HIGH SENSITIVITY BRUSH ARCING MONITOR FOR A DYNAMOELECTRIC MACHINE High noise immunity instrumentation for monitoring brush arcing in a dynamoelectric machine is disclosed. In a preferred form the instrumentation includes a stabilizing 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.</p> |
申请公布号 |
CA1194112(A) |
申请公布日期 |
1985.09.24 |
申请号 |
CA19830424993 |
申请日期 |
1983.03.31 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
SAWADA, FRED H.;BISHOP, JAMES S.;BLAIZE, LLEWELLYN A. |
分类号 |
G01R31/34;(IPC1-7):G01R31/34 |
主分类号 |
G01R31/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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