Direct current command generation for a stepper motor drive
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United States of America Patent
Stats
-
Jun 22, 1999
Grant Date -
N/A
app pub date -
Oct 2, 1997
filing date -
Oct 2, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for controlling a stepper motor is disclosed that includes a microprocessor for directly generating current command signals. The microprocessor is of the type having memory wherein the memory includes two transfer tables. The microprocessor, in accordance with software-selectable current magnitude parameter values and microstepping parameter values, determines a sequence of digital words to populate a first one of the tables. The stepper motor is a two-phase motor and the digital words correspond to the phase current commands are generated by the microprocessor using sine, and cosine law function tables. A DMA (Direct Memory Access) controller in the microprocessor outputs the populated transfer table to a drive circuit to energize the stepper motor while the main control software executing in the microprocessor populates the second-transfer table. Once the first transfer table has been completely output to the drive circuit, the roles of the transfer tables are reversed and the process is repeated.
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