摘要 |
<P>PROBLEM TO BE SOLVED: To reduce power consumption by monitoring a load of a stepping motor and variations of power supply voltage all the time, and then setting an optimum driving current with respect to loads time to time. <P>SOLUTION: A stepping motor control device includes: a driving current setting section 121 to set a driving current for driving a stepping motor 100; a load detection section 124 to detect a motor load from a driving waveform; a driving current adjustment section 127 to adjust the driving current according to a detected load; a step-out indication determination section 125 to make a determination that there is an indication of step-out when the detected load exceeds a certain threshold value; a voltage variation detection section 132 to detect variations of power supply voltage; and a driving current optimization control section 130 to perform an optimization control of the driving current on the basis of a driving current value at the moment the step-out indication determination section 125 makes a determination that there is the indication of step-out, while allowing the driving current value to be gradually lowered by the driving current setting section 121, and on the basis of a current value associated with the voltage variations detected by the voltage variation detection section 132. <P>COPYRIGHT: (C)2013,JPO&INPIT |