摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for controlling driving of a stepping motor wherein vibration at a start time and step-out due to load variation during acceleration driving can be suppressed by simple current switching control, to provide an automatic document conveying apparatus, and to provide an image forming apparatus. SOLUTION: A driving current value at the start time of a stepping motor is made lower than a driving current value during motor acceleration driving. Therefore, vibration at the start time of the motor can be reduced as compared with cases where the these driving current values are equal to each other. Further, since the driving current value during acceleration driving is made higher than the driving current value at the start time, it is possible to suppress the motor's stepping out due to variation in load on the motor during acceleration. COPYRIGHT: (C)2007,JPO&INPIT |