Direct current command generation for a stepper motor drive

Details Direct current command generation for a stepper motor drive Direct current command generation for a stepper motor drive

1997-10-02

1999-06-22

Ro, Bentsu

Electricity: motive power systems

Open-loop stepping motor control systems

H02P 822

Patent

active

059145790

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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