Signal frequency averaging filter
1 Hz - 4 KHz
Cognito Quam Electrotechnologies Ltd
These unique filters are standard, all-in-one, comprehensive products and process digital encoder quadrature or general clock/direction signals from 1 Hz to 4 kHz and are offered in two standard lines: the fully featured Maxi and the low cost Mini line.
They are particularly suited to slow moving production lines where the ideal control variable is average, and not instantaneous, speed. This happens because instantaneous speed varies randomly due to external events and systematically due to the various coupled, but uncontrolled, mechanisms to the plant power train. As such instantaneous speed cannot be effectively controlled as its measurement is randomly biased and noisy. In contrast, average speed measurement contains only the net effect of these uncontrolled mechanisms and does not allow them to corrupt speed measurement control.
Typical applications of the frequency averaging filters are:
* Slow pipe extrusion lines, where raw material feeding (and cost!) is a function of the long-averaged extrusion speed.
* Reciprocating machinery (such as weaving) speed control, whereby performance, energy and operational costs are optimized by controlling average motion speed,
* Engine speed monitoring and control, where shaft rotation is anything but smooth, and
* Vane or turbine flowmeters, where vane vibration due to turbulent flow corrupts rate or dose measurement.
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