| 摘要 |
<p>A drive apparatus for a stepping motor, including: a current detecting portion which detects a current value of phase current flowing through a phase winding; a constant-current-controlling portion which constant-current-controls the phase current flowing through the phase winding based on a detection result of the current detecting portion; a zero crossing detecting portion which detects a zero cross of the phase current based on the detection result of the current detecting portion; a phase difference detecting portion which detects a phase difference between the edge of a drive control pulse signal for the stepping motor and the zero cross detected by the zero crossing detecting portion; and a control device which causes the constant-current-controlling portion to perform constant-current control with a current value according to the phase difference detected by the phase difference detecting portion.</p> |
