Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1995-05-23
1997-04-29
Masih, Karen
Electricity: motive power systems
Open-loop stepping motor control systems
318685, 318254, 318138, 318599, 318439, 318811, H02P 800
Patent
active
056252692
ABSTRACT:
In this invention, a stepping motor control system includes a PWM unit for generating a PWM signal corresponding to a changing duty ratio, a low-pass filter for receiving the PWM signal from the PWM unit, and converting staircase voltage levels represented by the changing duty ratio of the PWM signal into a smooth, substantially continuous voltage signal, and an arbitrary current value setting type constant current driving circuit, which receives the voltage signal from the low-pass filter, excites the excitation coil of the stepping motor by a current value set in correspondence with the voltage signal, and maintains the current value set in correspondence with the voltage of the voltage signal. Thus, a stepping motor control system which can eliminate wasteful power consumption and can realize high-precision, constant-speed rotation can be provided. When the stepping motor control system is used for driving a carriage of a recording apparatus, a recording apparatus which is free from printing nonuniformity and can achieve power saving can be provided.
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Patent Abstracts of Japan, vol. 9, No. 8 (E-289), published Jan. 12, 1985, English Abstract of Japanese Patent No. 59-156195, published Sep. 5, 1984.
Canon Kabushiki Kaisha
Masih Karen
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