| 摘要 |
PROBLEM TO BE SOLVED: To provide a stepping motor control circuit capable of performing rotation driving of a stepping motor normally even in DC magnetic fields while inhibiting electric power consumption. SOLUTION: The stepping motor control circuit including a rotation detecting circuit 109 configured to detect an induced signal VRs generated according to the state of rotation of a stepping motor 102, and a control unit configured to select any one of a plurality of drive pulses having different energy from each other according to the results of detection detected by the rotation detecting circuit 109 and controls the drive of the stepping motor 102 alternately with the selected drive pulses having different polarities from each other, wherein if the difference of detected time points of the induced signals VRs generated when rotating driving is performed with the drive pulses having the same energy and different polarities is not shorter than a predetermined time, the control unit changes the drive pulse to a drive pulse having a larger energy than that of the drive pulse and drives the stepping motor. COPYRIGHT: (C)2011,JPO&INPIT |
