Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative
Patent
1980-02-06
1982-06-08
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonquantitative
324 51, 307311, 307356, 340661, H04B 102, G01R 3102, G08B 2100, H03K 5153
Patent
active
043341888
ABSTRACT:
A wear-indicating brush and warning circuit adapted to convey an indication to an operator that a dynamoelectric machine provided with such a brush is in need of maintenance before the brush wears to the point that a rotor contact surface is damaged by contact with electrical connections to the brush are disclosed. A brush (10) having current carrying pigtail leads (16) embedded therein includes a wear-detecting wire (20) embedded in the brush a short distance (A) beyond the lowest extent of the pigtail leads (16). The wire (20) is insulated over its periphery, including its tip (24), the insulation (26) being abraded by contact with the rotor contact surface (50), so that the wire (20) senses the voltage present thereon. Non-latching warning circuits (66, 66a) are disclosed, with and without the use of an isolating resistor within the dynamoelectric machine to permit the use of a single wire between the machine and the warning circuit.
Also disclosed is a warning circuit for indicating that an input is electrically connected to a voltage, for indicating that a line (20) has contacted a rotor contact surface. The voltage sensed may be negative or positive, over a wide range, so that the positioning and number of brushes (10) is irrelevant. The circuit (92) includes an oscillating voltage source (122) and comparison circuits (122, 124, 128) giving a warning indication when an input line is connected to a voltage and is unable to follow the oscillating voltage.
REFERENCES:
patent: 4024525 (1977-05-01), Baumgartner et al.
patent: 4152656 (1979-05-01), Udvardi-Lakos
DeClercq James P.
Eltra Corporation
Snow Walter E.
Strecker Gerard R.
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