Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1995-05-23
1997-09-23
Ip, Paul
Electricity: motive power systems
Open-loop stepping motor control systems
318138, 318685, 355 56, G03B 2734, H02P 800
Patent
active
056708556
ABSTRACT:
A motor control device for controlling a plurality of stepping motors, e.g., to move optical scanning units in an electrophotographic copying apparatus has a pulse generator, a pulse counter for counting the number of pulses generated by the pulse generator, a driver for driving the plurality of stepping motors in accordance with pulses generated by the pulse generator, a selector for selecting connections between the driver and each stepping motor, a comparison device for comparing the excitation phase of the driver and the excitation phase of each respective stepping motor, and a controller for matching the excitation phase of the driver and the excitation phase of each stepping motor based on the results of the comparison by the comparison device. This enables control of a plurality of stepping motors by a single driver without causing excessive load on a CPU, and reliably matches the excitation phase output fed by the driver relative to the excitation phase of the stepping motor which was stationary on the previous cycle.
REFERENCES:
patent: 4833544 (1989-05-01), Sato et al.
patent: 5113218 (1992-05-01), Morikawa et al.
Ip Paul
Minolta Co. , Ltd.
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