Electricity: motive power systems – Positional servo systems – With compensating features
Patent
1991-06-04
1992-10-20
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
With compensating features
318560, G05D 23275
Patent
active
051573172
ABSTRACT:
This is a method and associated apparatus for employing a non-regulated voltage input to a DC driver normally outputting a voltage having a curve with a dead band and a variable slope which is a function of the non-regulated voltage input to produce an output to a DC precision positioner from the DC driver which has a constant slope and no deadband. It is particularly useful in pen plotters. The method comprises the steps of, sensing the position of the DC precision positioner and outputting a digital signal indicating the position; calculating the slope of the voltage output from the DC driver; obtaining a pre-established voltage compensation value on a compensation voltage curve which will force the voltage output from the DC driver to attain a value on a voltage curve having a constant slope and no deadband; and, inputting the pre-established voltage compensation value to the DC driver in combination with the non-regulated voltage input whereby the voltage output from the DC driver driving the DC precision positioner attains the value on the voltage curve having a constant slope and no deadband.
REFERENCES:
patent: 4052642 (1977-10-01), Speth et al.
patent: 4460968 (1984-07-01), Cavill et al.
patent: 4549125 (1985-10-01), Sonobe
patent: 4855655 (1989-08-01), Shimizu
CalComp Inc.
Masih Karen
Shoop Jr. William M.
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