Position-based step control algorithm for a motion control system
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United States of America Patent
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Jul 22, 2014
Grant Date -
Jan 31, 2013
app pub date -
Jul 29, 2011
filing date -
Jul 29, 2011
priority date (Note) -
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Abstract
A motion control interface device includes an FPGA configured to implement a step generation algorithm that generates step control signals for a motion device. The signals are not determined based directly on time, but instead are determined from the position of the motion device. More particularly, the step generation algorithm operates to keep track of a position fraction based on the position. The position fraction is incremented (or decremented) at each clock tick of the FPGA. The algorithm generates rising edge signals when the position fraction crosses a particular threshold value, referred to as the rising edge threshold value. Similarly, the algorithm signals direction changes when the position fraction crosses a threshold referred to as the direction change threshold value.
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