Step motor driving device
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United States of America Patent
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Jul 5, 2022
Grant Date -
Aug 26, 2021
app pub date -
Jun 21, 2019
filing date -
Jul 2, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
To reliably rotate a step motor while reducing power consumption, a step motor driving device includes a step motor that includes a rotor, stator, coil, driver circuit that outputs a measurement drive signal to the coil, phase detecting circuit that detects a counter-electromotive current that is generated in the coil after the output of the measurement drive signal and determines whether a phase of the rotor is a desired phase based on the detected counter-electromotive current, and a control unit that, if the phase is the desired phase, controls the step motor by a first driving method in which the drive circuit outputs a first drive signal for rotating the rotor by one step, and, if not, controls the step motor by a second driving method different from the first driving method so as to restrict the rotation of the rotor.
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