Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1994-10-21
1996-11-12
Shoop, Jr., William M.
Electricity: motive power systems
Open-loop stepping motor control systems
364550, 318685, H02P 800
Patent
active
055743510
ABSTRACT:
A plurality of acceleration tables consisting of a sequence of step times defining intervals between steps and thus an acceleration profile to be executed by a stepper motor is stored in a first memory. A step table defining a sequence of excitation patterns for driving a stepper motor is stored in a second table. Identical DMA channels output the step times to a timer and an exitation pattern to a buffer. The timer measures the duration of the step times and when each step time expires generates a trigger signal which initiates the transfer of the next step time and next excitation pattern through the respective DMA channels. The buffer outputs are inverted to form bipolar signals to drive current drivers in accordance with the excitation pattern. The apparatus is initialized by a data processor to select one of the plurality of excitation tables to drive a selected motor. The DMA channel for outputting the acceleration table is initialized for non-repetitive operation and the DMA channel outputting the step table is initialized for cyclic operation. The direction in which the stepper motor is to be driven is determined by the direction in which the step table is accessed.
REFERENCES:
patent: 4258622 (1981-03-01), Estrabaud et al.
patent: 4356439 (1982-10-01), Mott et al.
patent: 4980846 (1990-12-01), Chapman
patent: 5032780 (1991-07-01), Hopkins
patent: 5200683 (1993-04-01), Taylor et al.
Jacobson Gary S.
Kirschner Wesley A.
Ramadei Micheal J.
Masih Karen
Pitney Bowes Inc.
Reichman Ronald
Scolnick Melvin J.
Shoop Jr. William M.
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