| 摘要 |
PURPOSE:To decrease a torque reduction even in low vibration and high frequency by setting a normal exciting pattern in a high frequency band, while setting a microstep exciting pattern in a low frequency band. CONSTITUTION:A CPU 13 selects a stepping motor driving frequency in response to the increase or decrease in data storage amount in a buffer memory 6. If the selected motor driving frequency is lower than a predetermined frequency, a microstep 1-2 phase exciting pattern is set, while if it is higher than the predetermined frequency, a normal 1-2 phase exciting pattern is selected, and a stepping motor 3 is driven by the frequency and the exciting pattern thereof. |
