DRIVE CIRCUIT FOR TWO-COIL STEP MOTOR, TWO-COIL STEP MOTOR, AND ELECTRONIC CLOCK USING THESE

Title:

DRIVE CIRCUIT FOR TWO-COIL STEP MOTOR, TWO-COIL STEP MOTOR, AND ELECTRONIC CLOCK USING THESE

Document Type and Number:

WIPO Patent Application WO/2017/043629

Kind Code:

A1

Abstract:

Provided is a drive circuit (10) for a two-coil step motor having: a rotor (51); a stator (52) that has first, second, and third stator magnetic poles; a coil A magnetically coupled to the first stator magnetic pole and the third stator magnetic pole; and a coil B magnetically coupled to the second stator magnetic pole and the third stator magnetic pole; wherein the drive circuit for a two-coil step motor has a drive pulse generation circuit (13) for outputting a drive pulse SP, a detection pulse generation circuit (15) for outputting a detection pulse CP for detecting counter electromotive current generated in the coil A and the coil B, and a rotation detection circuit (30) for inputting a detection signal CS generated by the detection pulse CP and determining whether the rotor (51) has rotated.

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Inventors:

TAKYOH YU (JP)
FUKUSHIMA TOSHIAKI (JP)
MAEDA TOSHINARI (JP)
IRI DAISUKE (JP)
MATSUOH DAISUKE (JP)

Application Number:

PCT/JP2016/076624

Publication Date:

March 16, 2017

Filing Date:

September 09, 2016

Export Citation:

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Assignee:

CITIZEN WATCH CO LTD (JP)

International Classes:

G04C3/14; H02P8/02

Foreign References:

JP2014195371A	2014-10-09
JP2015084633A	2015-04-30

Other References: