Shaft rotation analyzer using variable capacitance transducer maintained at a constant voltage
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United States of America Patent
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Oct 16, 1990
Grant Date -
N/A
app pub date -
Mar 21, 1988
filing date -
Mar 21, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A variable capacitor whose capacitance is a function of shaft position is coupled to a rotating shaft. A constant voltage is applied to the capacitor. As the shaft rotates, the changing capacitance of the variable capacitance causes current to flow into and out of the variable capacitor in response to the shaft rotation--thus providing a current source with no inherent practical frequency response limitations. A transresistance amplifier converts the current to an output voltage which is proportional to instantaneous shaft velocity. Various arrangements are used to eliminate the discontinuity associated with the inherent sign change of the capacitance time derivative while retaining the signal components associated with instantaneous velocity changes of the rotating shaft. The broadband instantaneous velocity response of the resulting shaft rotation analyzer has numerous applications in the detection of 'signatures' of rotating shafts--such as shaft speed variations attributable to electric motor commutator contact, cogging variations, and torque pulsations due to the firing of cylinders in reciprocating engines.
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