Stepper drive control using variable step angle
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United States of America Patent
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Dec 1, 1998
Grant Date -
N/A
app pub date -
Jun 30, 1997
filing date -
Jun 30, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
The stepper motor controller, implemented as computer software, converts each input pulse into many internal pulses, which internal pulses are used for calculating a command angle during each sampling time interval of operation. The values of the angle commands may vary, from interval to interval, as a function of the input pulse train rate (i.e., the number of new pulses input per interval). The system accesses an internal look-up table to convert vector data into torque values, for driving the motor; if the input pulse rate is sufficiently high to warrant doing so, the look-up table data can be accessed out of sequence.
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