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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2021/059837
Kind Code:
The objective of the present invention is to perform fine control of a step motor. This step motor drive device includes a step motor (20) comprising a rotor (22), a stator (23a, 23b), and a coil (21) for generating a magnetic force toward the stator, a drive circuit (7) for outputting a drive signal including a plurality of partial signals that are output intermittently, a detecting circuit for detecting a counter electromotive current generated in the coil after each partial signal has been output, and a control unit for controlling the drive circuit, wherein: the drive circuit outputs any partial signal contained in the drive signal to the coil, and outputs the next partial signal to the coil in accordance with a change in the counter electromotive current generated in the coil after the partial signal has been output; and the control unit determines a control system for the step motor on the basis of intervals between the plurality of partial signals, and controls the drive circuit on the basis of the determined control system.

TAKYO, Yu (LTD. 1-12 Tanashicho 6-chome, Nishitokyo-sh, Tokyo 11, JP)
Application Number:
Publication Date:
April 01, 2021
Filing Date:
August 26, 2020
Export Citation:
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CITIZEN WATCH CO., LTD. (Tanashicho 6-chome Nishitokyo-sh, Tokyo 11, JP)
International Classes:
H02P8/02; G04C3/14
Attorney, Agent or Firm:
HARUKA PATENT & TRADEMARK ATTORNEYS (3 Rokubancho, Chiyoda-k, Tokyo 85, JP)
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