Method of controlling a stepping motor and drive circuit employi

Details Method of controlling a stepping motor and drive circuit employi Method of controlling a stepping motor and drive circuit employi

1991-05-22

1993-06-01

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318 41, H02P 800

Patent

active

052163482

ABSTRACT:
A method of controlling a stepping motor for supplying a drive current to each of the phase windings thereof in response to control signals. The control signals are formed by combining logically phase exciting signals and overdrive signals in synchronization with a clock pulse signal. Each of the overdrive signals also includes a pulse with a longer width at an earlier stage of a phase exciting duration during which a drive current flows in the stepping motor and a pulse with a shorter width at a later stage of the phase exciting duration. Hence, a small drive current flows in the phase windings after a later stage of the exciting duration, thus reducing power consumption.

REFERENCES:
patent: 3972535 (1976-08-01), Bleiman
patent: 4157647 (1979-06-01), Takahashi et al.
patent: 4293807 (1981-10-01), Foster et al.
patent: 4353021 (1982-10-01), Watanabe et al.
patent: 4757245 (1988-07-01), Ayers et al.
patent: 4769585 (1988-09-01), Tanuma et al.
patent: 4933619 (1990-06-01), Chang

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