| 摘要 |
PROBLEM TO BE SOLVED: To reduce erroneous rotation detection caused by relative fluctuations in power source voltage and load.SOLUTION: A stepping motor control circuit includes a power supply 116, control means which controls driving of a stepping motor 108 using a driving pulse, and rotation detection means for detecting, on the basis of an induction signal VRs generated by rotation of the stepping motor 108 and exceeding a predetermined reference threshold voltage Vcomp, rotation conditions of the stepping motor 108 in a predetermined detection section T. The rotation detection means detects rotation conditions using a detection section with a length according to a relationship between the voltage of the power supply 116 and the size of the load of the stepping motor 108. |
