Kabushiki Kaisha Suwa Seikosha

Epson Corporation

Kabushiki Kaisha Suwa Seikosha & Epson Corporation

Torao Yajima

Yoshifumi Gomi

A drive control system for a step motor. The system includes a detector for detecting when the step motor is central between step positions of the step motor and for producing a timing signal representative of the central position of the step motor. Motor drive coils selectively driven by a drive control circuit actuate the step motor. The drive control circuit receives the timing signal and in response thereto selectively actuates the motor drive coils to allow the step motor to stop at its next step position.

Step motor drive control

A speed control for step motors is provided with a speed control circuit for periodically actuating a motor driving circuit at least in part in response to timing signals representative of the incremental advance of the step motor during acceleration. The time interval between the respective actuations of the motor driving circuit during acceleration is stored in a memory, the speed control circuit actuating the motor driving circuit during deceleration of the step motor at intervals which are a function of the stored acceleration intervals in the memory, applied in reverse order.

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Shiojiri, Japan

Torao Yajima