National Instruments Corporation

Rodger Schorr

Joseph E Peck

Neil S Feiereisel

A motion control system and method are disclosed which provide improved pulse placement for smoother operation of a motion device such as a stepper motor. A placement of pulses may be determined for each of a plurality of time intervals such that the pulses are placed evenly across the plurality of time intervals, wherein the quantity of pulses in each of the time intervals is variable. The pulses may be generated and sent to the motion device to move the object to the desired position. A delay may be used to place each pulse at an arbitrary location within one of the time intervals. Where the desired step rate is fractional, time may be &ldquo;borrowed&rdquo; for one loop iteration from other loop iterations. In one embodiment, the step rate may be changed from one loop period to the next.

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Round Rock, TX, United States of America

Rodger Schorr