著者

上田 洵 志田 政春

出版者

一般社団法人 日本時計学会

雑誌

日本時計学会誌 (ISSN:00290416)

巻号頁・発行日

vol.92, pp.1-13, 1980-03-20 (Released:2017-11-09)

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This paper describes an improved drive system of stepping motor, which contributes much to the decrease in current consumption of the existing stepping motor. We introduce here the Adaptive-Controlled Drive System, where the detecting method of rotation or non-rotation of rotor is the most important. This drive system permits us to design smart wrist watches with Center secorld & Calendar, reducing the current consumption of stepping motor to less than 1 μA; the value is a half or a third as large as that by the conventional drive system with the fixed pulse width. If the battery life of the watch is fixed, the capacity of the battery can be halved approximately. Namely, the effective life can be doubled at the same capacity. All the elements msed for this system are constituted within the IC driven at 1.57 V, and the system itself requires little (almost negligible) power consumption.