Seiko Seiki Kabushiki Kaisha

Akira Inoue

Shinichi Nomura

Osamu Hanami

A stepping motor control apparatus comprises current computing means for computing a motor-coil exciting current corresponding to the holding position from a predetermined wave form pattern; micro step driving means for driving the stepping motor toward the final holding position through a micro step transfer distance shorter than a regular step transfer interval by exciting the motor-coil by application of the exciting current obtained from the computing means; and acceleration control means for controlling the stepping motor acceleration by switching on and/or off the exciting current of the motor-coil in accordance with an acceleration signal.

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Narashino, Japan

Akira Inoue