| 摘要 |
PURPOSE:To drive the stepping motor by low power even when load variation is large and a range of driving pulse width is wide by changing reference voltage in response to the variation of pulse width. CONSTITUTION:The revolution or non-revolution of a rotor 2 of the stepping motor 10 is decided according to a fact that induced voltage generated by vibration during the time when the rotor 2 rests after driving pulses are applied to the stepping motor 10 is higher than the reference voltage or is lower than that. The pulse width automatically driving the stepping motor 10 in response to the variation, etc. of load and a driving condition by utilizing the decision is changed. The reference voltage in such a stepping motor driving device is changed in response to the change of the pulse width. |
