Control device for stepping motor and control method for stepping motor
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United States of America Patent
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Feb 9, 2016
Grant Date -
Feb 12, 2015
app pub date -
Jun 11, 2014
filing date -
Aug 9, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
There is provided a control device for a stepping motor, configured to apply an excitation current to multiple coils to rotate a rotor. The control device includes a drive unit configured to apply a drive voltage to the coils, and a control unit configured to control the drive voltage applied by the drive unit, wherein the control unit includes a stop control unit configured to perform, during a hold period of a stop period of the stepping motor, a stop control which gradually decreases a magnitude of the excitation current flowing in the coils such that the rotor moves to a predetermined stop position, and wherein the stop control unit is configured to perform the stop control such that a variation amount of the excitation current per unit time becomes a predetermined threshold value for the stop period or less.
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